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Institute
- Graduate School of Life Sciences (771)
- Theodor-Boveri-Institut für Biowissenschaften (479)
- Physikalisches Institut (208)
- Institut für Informatik (139)
- Institut für Theoretische Physik und Astrophysik (122)
- Institut für Organische Chemie (113)
- Institut für Mathematik (112)
- Institut für Psychologie (110)
- Institut für Pharmazie und Lebensmittelchemie (100)
- Julius-von-Sachs-Institut für Biowissenschaften (89)
Schriftenreihe
Sonstige beteiligte Institutionen
- Fraunhofer-Institut für Silicatforschung ISC (5)
- Helmholtz Institute for RNA-based Infection Research (HIRI) (5)
- Technische Hochschule Nürnberg Georg Simon Ohm (3)
- Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Raumfahrtsysteme (2)
- EMBL Heidelberg (2)
- Institut für Tierökologie und Tropenbiologie (2)
- Lehrkrankenhaus II. Medizinische Klinik Klinikum Coburg (2)
- Rudolf Virchow Center for Integrative and Translational Bioimaging, University of Würzburg (2)
- Universität Belgrad, Serbien (2)
- Universitätsklinikum Münster (2)
ResearcherID
- B-1911-2015 (1)
- B-4606-2017 (1)
- C-2593-2016 (1)
- D-1250-2010 (1)
- I-5818-2014 (1)
- J-8841-2015 (1)
- M-1240-2017 (1)
- N-2030-2015 (1)
- N-3741-2015 (1)
EU-Project number / Contract (GA) number
- 311781 (1)
- 320377 (1)
- EU (FP7/ 2007-2013) (1)
Large parts of the tropical lowland rain forests of Sabah (Malaysia) were transformed into secondary forests due to heavy logging. Additionally the remaining forest remnants are isolated from each other by large scale oil palm plantations. Biodiversity patterns and responses of the community of leaf litter ants were studied in anthropogenically disturbed habitats and primary forests of different size. In logged over forests, only 70 per cent of the species of a primary forest were present even 25 years after timber extraction. The ant communities were thinned and could be described by a lower species density producing lower species numbers and a different community composition. The similarity in species number and community composition between logged over forests of different degrees of disturbance was explained by source-sink dynamics within a heterogeneous forest matrix. Rain forest fragments displayed even higher reductions in species density, numbers and diversity due to a more pronounced thinning effect. Even forest isolates exceeding 4 000 ha in size did not support more than 50 per cent of the species of the leaf litter ant community of a contiguous primary rain forest. Additionally, an increase in tramp species was recorded with decreasing size of the forest fragments, leading to a very different community composition. Regarding the leaf litter ant community, the remaining rain forest fragments of Sabah are effectively isolated by a barrier of oil palm plantation, now stretching all over the lowlands of the east coast. Only 13 species, which belonged to the forest ant community in highly disturbed areas were collected in these plantations. Some of the 10 other species of the highly reduced ground-dwelling ant community in the plantations are known as invasive tramp species, forming large exclusive territories. Correlative evidence and a field experiment implied, that leaf litter humidity, volume and temperature affect the distribution and community composition of forest leaf litter ant species. The smaller primary forests and the most disturbed logged over forests in this study revealed higher temperatures and lower humidity levels and a reduction in leaf litter volume compared to a large primary forest or forests affected by a lower impact of timber harvesting. If the pattern for leaf litter ants is confirmed for other taxa, the implications for any efficient management design aiming to preserve the majority of the biodiversity of the country are tremendous and current concepts need rethinking.
In the experiments presented in this work, third-order, time-resolved spectroscopy was applied to the disentanglement of nuclear and electronic degrees of freedom in polyatomic molecules. The motivation for approaching this problem was given by the decisive role that the coupling of nuclear and electronic dynamics plays in the mechanism of photochemical reactions and photobiological processes. In order to approach this complex problem, different strategies within the framework of time-resolved, four-wave mixing spectroscopy were developed that allowed for the dynamic as well as the energetic aspects of vibronic coupling in non-radiative transitions of polyatomic molecules to be addressed. This was achieved by utilizing the influence of optical as well as Raman resonances on four-wave mixing processes. These resonance effects on third-order, optical processes allow for a high selectivity to be attained with respect to the interrogation of specific aspects of molecular dynamics. The development of different strategies within the framework of time-resolved, four-wave mixing spectroscopy for addressing the problem of vibronic coupling began with the experiments on gaseous iodine. This simple, well investigated molecular system was chosen in order to unambiguously characterize the effect of Raman resonances on four-wave mixing processes. A time-resolved degenerative four-wave mixing (DFWM) experiment was carried out on gaseous iodine that allowed for the dynamics of coherent Stokes Raman scattering (CSRS) as well as a coherent anti-Stokes Raman scattering (CARS) to be observed parallel to the dynamics of a DFWM process at different spectral positions of the FWM signal. Here, the state-selectivity of these different FWM processes manifests itself in the vibrational wave packet dynamics on different electronic potentials of iodine. It could be shown that Raman resonances determine the selectivity with which these FWM processes prepare and interrogate nuclear dynamics in different electronic states. With the insight gained into the relevance of Raman resonant processes in FWM spectroscopy, an experimental scheme was devised that utilizes this effect to selectively interrogate the dynamics of a specific vibrational mode within a polyatomic molecule during a radiationless electronic transition. Here, a CARS process was employed to selectively probe specific vibrational modes of a molecular system by variably tuning the energy difference between the lasers involved in the CARS process to be in Raman resonance with the vibrational energy spacing of a particular vibrational mode. Using this aspect of a tunable resonance enhancement within a CARS scheme, this optical process was incorporated in a time-resolved pump-probe experiment as a mode-selective probe mechanism. This type of experimental configuration, that employs four pulsed laser fields, was classified as a pump-CARS scheme. Here, a laser pulse independent of the CARS process initiates the molecular dynamics that are interrogated selectively with respect to the vibrational mode of the system through the simultaneous interaction of the three pulsed fields involved in the CARS process. Time-resolution on a femtosecond timescale is achieved by introducing a time delay between the independent pump laser and the laser pulses of the CARS process. The experimental configuration of a pump-CARS scheme was applied to the study of the nuclear dynamics involved in the radiationless electronic transition between the first excited singlet state (S1) and the electronic ground state (S0) of all-trans-b-carotene. The mode-selective CARS probe allowed for the characteristic timescale with which specific vibrational modes are repopulated in the S0 state to be determined. From the varying repopulation times of specific vibrational modes, a mechanism with which the full set of vibrational states of the S0 potential are repopulated subsequent to the internal conversion process could be postulated. Most importantly, the form of nuclear motion that primarily funnels the population between the two electronic states could be identified as the C=C symmetric symmetric stretch mode in the polyene backbone of b-carotene. With this, the reaction coordinate of this radiationless electronic transition could be identified. The experiment shows, that the CARS probe is capable of determining the nuclear motion coupled to a radiationless electronic transition in complex polyatomic systems. The S1/S0 internal conversion process in b-carotene was further investigated with time-resolved transient gratings. Here, the energetic aspects of a non-adiabatic transition was addressed by determining the influence of the vibrational energy on the rate of this internal conversion. In order to compare the rate of internal conversion taking place out of vibrational ground state modes versus this transition initiating out of vibrationally hot modes, the strategy of shifting the probe mechanism in the transient grating scheme to spectral positions within and out of the red flank of the S1 absorption profile was pursued. The interrogation of different vibrational states was verified by determining the degree of vibrational cooling, taking place parallel to the internal conversion process. With this strategy, it could be shown that vibrationally hot states contribute to the internal conversion with a higher rate than vibrational ground state modes. In summary, different third-order, optical processes in the framework of time-resolved FWM were applied to the study of non-adiabatic dynamics in polyatomic molecules. By utilizing the effect of optical as well as Raman resonances on different FWM processes, it could be shown that third-order, time-resolved spectroscopy is a powerful tool for gaining insight into complex molecular dynamics such as vibronic coupling. The experiments presented in this work showed that the CARS process, as a mode-selective probe in time-resolved experiments, is capable of disentangling nuclear and electronic dynamics.
Different transgenes that can be expressed in neurons to kill or block them were compared. Tetanus neurotoxin blocked chemical synapses very efficiently. Synapses consisting of a chemical and an electrical component were blocked more reliably by expressing a human inwardly rectifying potassium channel. To gain temporal control over neuronal function, three genetic tools have been investigated. None of the systems is without drawbacks, however, the recombination induced tetanus neurotoxin expression is a promising approach. The knowledge gained from the comparative methodological study was used to investigate the role of neurons in sensory systems in processing different sensory informations. Receptor neurons sensitive for chemical or mechanical stimuli were correlated to specific olfactory behaviors or locomotor tasks. The main topic of this thesis is the much discussed question of which neurons are involved in motion processing in the visual system of flies. Neither L2 nor L4 neurons in the first visual neuropil are essential for motion-detection. The results indicate that maybe motion is detected by the network of amacrine cells (a). The vertical motion-sensitive VS cells in the lobula plate are not necessary for behavioral responses to vertical motion. This finding implies that the lack of VS cells in the structural mutant optomotor blind is not causally related to the altered responses to motion stimuli. Other abnormalities in optomotor blind are responsible for this behavioral phenotype. This work shows the potential of the described methods in studying information processing in the Drosophila brain. Groups of neurons were correlated to complex behavioral responses and theories about information processing were tested by behavioral experiments with transgenic flies. The refinement of the genetic tools to interfere with neuronal function will make the Drosophila brain an even better model to study information processing in nervous systems.
The Upper Cretaceous Ajlun Group (Cenomanian-Turonian) of southern/south-eastern Jordan has been analysed in 15 detailed sections with thicknesses between 40 m and 200 m. Taxonomic, palaeoecological, taphonomic, and sedimentological aspects were taken into account. During the early Upper Cretaceous the study area was situated at the south-eastern margin of the Tethys Ocean, between the palaeo-shoreline in the south-east and an offshore carbonate platform in the west. Thus, the measured sections include a complete facies succession from terrestrial-dominated environments via marginal marine siliciclastics to an area of carbonate precipitation. So far, very little is known about the fauna and the depositional environment of the group, especially of the transitional marginal marine part. Also, in depth studies of the Cretaceous fauna of southern Jordan are very rare. Therefore, the benthic fauna of the area is described in an extensive taxonomic chapter. It consists of 117 taxa, 77 of which are bivalves, 22 gastropods, 9 echinoids, and 4 corals. The phyla Porifera, Bryozoa, and Brachiopoda are represented by 1 species each. Additionally, at least two species of decapod crustaceans were found. One bivalve species is new: Anthonya jordanica from Cenomanian claystones of the eastern study area. 41 quantitative samples of the benthic invertebrate fauna were grouped into nine associations and three assemblages by means of a Q-mode cluster analysis. These are described as remnants of former communities and their environments are discussed. Salinity and substrate consistency are assumed to have been the most important environmental parameters controlling the faunal distribution. The overall palaeo-environment is discussed on the basis of sedimentological and palaeoecological results. It was primarily influenced by the morphology of the sea floor, sediment supply, and salinity of the sea water.
Originally renowned for their spectacular epigaeic raids, army ants have captured scientific attention for almost two centuries. They now belong to one of the best studied group of ants. However, most of our knowledge about army ants was derived from the study of the minority of specialized, epigaeicly active species. These species evolved probably rather recently from hypogaeic ancestors. The majority of army ant species still leads a hypogaeic life and is almost completely unknown in its entire sociobiology. It thus remained speculative, whether the assumed 'general' characteristics of army ants represent an adaptation to epigaeic activity or apply also to the majority of hypogaeic species. Based on the recent observation that the hypogaeic Asian army ant Dorylus (Dichthadia) laevigatus recruits predictably to palm oil baits, I developed and tested an oil-baiting method for the study of hypogaeic (army)ants. Prior to my study, nothing was known about the sociobiology of the assumed rare D. laevigatus. Throughout my work, I showed D. laevigatus to be very common and abundant in a wide range of habitats in West-Malaysia and on Borneo. Investigating its foraging behavior, I revealed D. laevigatus to differ from epigaeicly active species in several ways. Never demonstrated for any of the epigaeic species, D. laevigatus established stable trunk trail systems. Such a trail system contradicted the perception of army ant foraging, which was believed to be characterized by raids with constantly alternating trail directions. The trunk trail system further enabled a near omnipresence of D. laevigatus within its foraging area, which was also believed to be atypical for an army ant. Raids differed in structure and composition of participating workers from those of epigaeic species. Also, bulky food sources could be exploited over long periods of time. The foraging system of D. laevigatus resembled in several ways that of e.g. leaf-cutter and harvester ants. Likewise contrary to the assumptions, D. laevigatus had a wide food spectrum and showed only little effect on local arthropod communities, even falling itself prey to other ants. Strong aggressive behavior was observed only towards ant species with similar lifestyles, enabling me to provide the first detailed documentation of interspecific fights between two sympatric Dorylus species. Similar to foraging habits or ecological impact, nothing was known about colony size and composition, nesting habits, or worker polymorphism for D. laevigatus or any other hypogaeic Dorylus species prior to my work. By observing and eventually excavating a colony, I showed D. laevigatus to have a much smaller colony size and to lack the large sized workers of epigaeic Dorylus species. Similar to epigaeic Dorylinae, I showed D. laevigatus to have a non-phasic brood production, to emigrate rarely, and to alter its nest form along with habitat conditions. Detailed morphological and geographical descriptions give an impression of the Asian Dorylus species and are expected to aid other researchers in the difficult species identification. The genetic analysis of a male collected at a light trap demonstrated its relation to D. laevigatus. Confirming the male and queen associations, D. laevigatus is now one of five Dorylus species (out of a total of 61), for which all castes are known. In cooperation with D. Kistner, I provide a morphological and taxonomical description of nine Coleopteran beetles associated with D. laevigatus. Behavioral observations indicated the degree of their integration into the colony. The taxonomic position of the beetles further indicated that D. laevigatus emigrated from Africa to Asia, and was accompanied by the majority of associated beetles. The diversity of D. laevigatus guests, which included a number of unidentified mites, was rather low compared to that of epigaeic species. Overall, I demonstrated the developed baiting containers to effectively enable the study of hypogaeic ants. I showed several other hypogaeic ant species to be undersampled by other methods. Furthermore, the method enabled me to documented a second hypogaeic Dorylus species on Borneo. A detailed description of this species' morphology, ecology, and interactions with D. laevigatus is provided. My study indicated D. laevigatus to be an ecologically important species, able to influence soil structure and organisms of tropical regions in many ways. Relating the observed traits of D. laevigatus to epigaeicly active species, I conclude that our assumption of 'general' army ant behavior is erroneous in several aspects and needs to be changed. The oil-baiting method finally provides a tool enabling the location and study of hypogaeic (army)ant species. This opens a broad field for future studies on this cryptic but nonetheless important group of ants.
The number of males in animal groups is an essential determinant of male and female reproductive strategies. Females may benefit from living with several males, whereas males generally strive to monopolize a group of females. Due to male intrasexual competition, the sex ratio of groups of anthropoid primates is generally female-biased. Gregarious Malagasy lemurs deviate from theoretical expectations derived from sexual selection theory and from patterns found among anthropoids because they live in relatively small groups with an even or male-biased adult sex ratio and lack sexual dimorphism. The aim of this thesis was to investigate sex-specific reproductive strategies relating to the unusual group composition of redfronted lemurs (Eulemur fulvus rufus) by combining behavioral, demographic and endocrinological data. In the first of a set of four studies I investigated the applicability of non-invasive endocrine measurements for monitoring ovarian function in wild redfronted lemur females in order to evaluate the degree of estrus synchrony. Further, I tested the prediction that males living in multi-male groups rely on indirect mechanisms of intrasexual competition, such as physiological suppression of testicular function. Several possible benefits gained from living with many males have been proposed and the hypothesis that additional males improve social thermoregulation was tested in the third study. Finally, I examined the proximate determinants of the unusual sex ratio within groups, the variation in the adult sex ratio as well as possible social benefits of the high number of males for both sexes. The study was conducted in Kirindy Forest, Madagascar, between April 1999 and July 2000. I recorded >3000 hours of focal animal data on social and sexual behavior of all adult members of five groups. Additionally, >2200 fecal samples of males and females were collected for subsequent hormone analysis using enzymeimmunoassay (EIA). Further, I analyzed demographic data from seven Eulemur fulvus rufus groups collected between 1996 and 2002. The analyses of fecal estrogen and progestogen excretion in wild and captive females revealed that monitoring ovarian function is principally possible in redfronted lemurs, as demonstrated by the analysis of samples from captive females. Characterization of ovarian cycles in wild females, however, was not possible, because of a high day-to-day variability in excreted hormones. Nevertheless, the study provided reliable information on gestation and cycle length as well as endocrine changes associated with gestation. Additionally, I established a method for prenatal sex determination using maternal fecal samples collected during late gestation. The excretion pattern of androgens in samples of males revealed no differences between dominant and subordinate males, indicating that dominant males did not suppress the endocrine function of subordinate rivals. High frequencies of matings in combination with large testes size suggest that male reproductive competition relies at least partly on sperm competition. Females did not benefit from the high number of males in their groups in terms of improved thermoregulation because surplus males did not participate frequently in huddling groups with females. Analysis of the demographic data revealed that birth and mortality rates were not sex-biased and that males migrated considerably more frequently than females, providing no proximate explanation for the unusual sex ratio. Females in this study may proximately regulate group composition by synchronizing their fertile periods, which were inferred indirectly from the temporal distribution of births within groups. Both males and females benefit from the high number of co-resident males because reduced male group size seemed to be the main predictor of take-over rate, and thus, infanticide risk. The results of these studies suggest that certain life history traits (fast maturation, short inter-birth intervals) may ultimately determine the high number of males and the lack of single-male groups seen in redfronted lemurs. An accelerated male life history may facilitate joint group transfers and take-overs of male coalitions without a transitional time outside bisexual groups. Because males and females both benefit from a high number of males the conflict of interests between the sexes is considerably defused.
Living apart together
(2002)
Cohesiveness between members of a social unit is a defining characteristic of animal social organization. Dispersed social organizations, where members of a social unit spend the main part of their activity period apart, have only recently been distinguished from cohesive social organizations and are still poorly understood with respect to their ecological basis and reproductive consequences. The general goal of this dissertation was to study the three components of the social system of fork-marked lemurs (Phaner furcifer), a small nocturnal primate from Madagascar living in dispersed pairs. First, I characterise their social organization, focusing on behavioural mechanisms of cohesion between pair partners. Second, through application of van Schaik's ecological model, I investigate predictions about the ecological basis of female intra-sexual avoidance, male-female social relationships and the determinants of differential female reproductive success. Finally, I analyse behavioural and genetic aspects of the mating system to test a recent hypothesis that proposes high extra-pair paternity in dispersed primate pairs resulting from constraints on male mate guarding. The study was conducted in Kirindy Forest in Madagascar between September 1998 and April 2001 during three field seasons for a total of 20 months. During more than 1400 hours of focal animal protocols, I sampled year-round data on space use, feeding ecology, time budgets, and social behaviour of all adults and three subadults of 8 families, complemented by simultaneous focal follows of both pair partners, year-round information on sleeping site use, measures on food abundance in each territory, morphological measurements, and DNA-microsatellite data for seven newly discovered polymorphic loci. Across eight social units and three breeding seasons, pairs were the prevailing grouping pattern (18 of 21 family years). Most pairs were stable for more than three mating seasons and used well defined stable territories. Although both pair partners used the same territory in a fairly similar fashion, average distance between pair partners was 100m, which was far considering that many territories measure only 200m in diameter. Pair partners spent only about 20% of activity time in less than 25m distance of each other and shared a sleeping site on average only every third day. Females were found to be dominant over their partner as well as over neighbouring males in all behavioural contexts. Most important food resources were exudates of a small number of tree species. Major food resources were distributed in small, defendable patches characterized by fast depletion and rapid renewal. In accordance with the ecological model, this led to strong within-group contest and scramble competition and weak between-group contest competition over food, as indicated by a positive dominance effect and a negative group size effect on female physical condition. Female reproductive success was determined mainly by family size. Paternity likelihood and exclusion analyses revealed that four out of seven offspring were most likely sired by an extra-pair male. Behaviour during the mating season implied that females as well as males take an active part in obtaining extra-pair copulations and that males try to guard their mates. Dispersed social organization in itself, i.e. low cohesion between pair partners, cannot explain high extra-pair paternity. I propose instead that several other factors common to most primates living in dispersed pairs constrain mate guarding and lead to high EPP. The ecological settings determine the mode of food competition and have shaped the social system of fork-marked lemurs in several ways. Intense within-group competition for food may have ultimately led to female intra-sexual avoidance and range exclusivity which represents an evolutionary precursor of pair-living. Although it remains elusive why females ultimately associated with single males, patterns of within-group contest competition for food explain why pair partners avoid each other during nocturnal activity. The limited number of food resources that is used in repetitive fashion and incomplete knowledge about the pair partners position explain why pair partners meet relatively often and why most encounters involve agonistic conflict. Rigid feeding itineraries characteristic of exudate feeders are likely to pose high costs to offspring dispersing to unfamiliar areas. Feeding ecology can, therefore, explain why parents tolerate delayed natal dispersal despite a negative effect on actual female reproductive success. In conclusion, the present study successfully applied existing socio-ecological theory to a new area of research, refined a recent evolutionary model and contributed important comparative data to our understanding of dispersed pairs in particular and primate and animal societies in general.
In my Ph.D. thesis "On the geometry and parametrization of almost invariant subspaces and observer theory" I consider the set of almost conditioned invariant subspaces of fixed dimension for a given fixed linear finite-dimensional time-invariant observable control system in state space form. Almost conditioned invariant subspaces were introduced by Willems. They generalize the concept of a conditioned invariant subspace requiring the invariance condition to hold only up to an arbitrarily small deviation in the metric of the state space. One of the goals of the theory of almost conditioned invariant subspaces was to identify the subspaces appearing as limits of sequences of conditioned invariant subspaces. An example due to {\"O}zveren, Verghese and Willsky, however, shows that the set of almost conditioned invariant subspaces is not big enough. I address this question in a joint paper with Helmke and Fuhrmann (Towards a compactification of the set of conditioned invariant subspaces, Systems and Control Letters, 48(2):101-111, 2003). Antoulas derived a description of conditioned invariant subspaces as kernels of permuted and truncated reachability matrices of controllable pairs of the appropriate size. This description was used by Helmke and Fuhrmann to construct a diffeomorphism from the set of similarity classes of certain controllable pairs onto the set of tight conditioned invariant subspaces. In my thesis I generalize this result to almost conditioned invariant subspaces describing them in terms of restricted system equivalence classes of controllable triples. Furthermore, I identify the controllable pairs appearing in the kernel representations of conditioned invariant subspaces as being induced by corestrictions of the original system to the subspace. Conditioned invariant subspaces are known to be closely related to partial observers. In fact, a tracking observer for a linear function of the state of the observed system exists if and only if the kernel of that function is conditioned invariant. In my thesis I show that the system matrices of the observers are in fact the corestrictions of the observed system to the kernels of the observed functions. They in turn are closely related to partial realizations. Exploring this connection further, I prove that the set of tracking observer parameters of fixed size, i.e. tracking observers of fixed order together with the functions they are tracking, is a smooth manifold. Furthermore, I construct a vector bundle structure for the set of conditioned invariant subspaces of fixed dimension together with their friends, i.e. the output injections making the subspaces invariant, over that manifold. Willems and Trentelman generalized the concept of a tracking observer by including derivatives of the output of the observed system in the observer equations (PID-observers). They showed that a PID-observer for a linear function of the state of the observed system exists if and only if the kernel of that function is almost conditioned invariant. In my thesis I replace PID-observers by singular systems, which has the advantage that the system matrices of the observers coincide with the matrices appearing in the kernel representations of the subspaces. In a second approach to the parametrization of conditioned invariant subspaces Hinrichsen, M{\"u}nzner and Pr{\"a}tzel-Wolters, Fuhrmann and Helmke and Ferrer, F. Puerta, X. Puerta and Zaballa derived a description of conditioned invariant subspaces in terms of images of block Toeplitz type matrices. They used this description to construct a stratification of the set of conditioned invariant subspaces of fixed dimension into smooth manifolds. These so called Brunovsky strata consist of all the subspaces with fixed restriction indices. They constructed a cell decomposition of the Brunovsky strata into so called Kronecker cells. In my thesis I show that in the tight case this cell decomposition is induced by a Bruhat decomposition of a generalized flag manifold. I identify the adherence order of the cell decomposition as being induced by the reverse Bruhat order.
Clinical evaluation of novel methods to determine dialysis parameters using conductivity cells
(2002)
Eine die letzten beiden Jahrzehnte anhaltende Diskussion über die erforderliche Dosis Dialyse, die ein Patient benötigt, ergab, daß der Harnstoff-basierte Kt/V-Wert signifikant mit der Morbidität von ‚end stage renal deasease' (ESRD)- Patienten korreliert. Wenn auch nicht vollständig akzeptiert, so scheint es doch zunehmende Übereinkunft zwischen Nephrologen, daß eine angemessene Dialysebehandlung von Patienten ohne Restdiurese im Rahmen eines 3x4 Stunden pro Woche- Schemas mindestens einen Kt/V-Wert von 1.2 bis 1.3 ergeben sollte, um auf lange Sicht die Lebensqualität zu sichern und die Morbidität und Mortalität niedrig zu halten. K ist die vom Dialysesystem erbrachte Clearance, t die Behandlungszeit und V das Harnstoff-Verteilungsvolumen, welches dem Gesamt-Körperwasser nahezu gleicht. Kt/V wird in der Dosiseinheit (ml Medikament pro ml Körperwasser) ausgedrückt und daher auch häufig als Dialyse-‚Dosis' bezeichnet, auch wenn darüber wegen der Zusammenfassung in nur einer Harnstoff-korrelierten Zahl konträr diskutiert wird. Diese Arbeit besitzt eine eher technische Prämisse und möchte sich nicht an dieser Diskussion beteiligen. Sie möchte dem interessierten Nephrologen lediglich eine patientenfreundliche, präzise, kostenneutrale und leicht zu handhabende technische Lösung an die Hand geben, um kontinuierlich die in Kt/V ausgedrückte Dialysedosis zu überwachen. Natürlich ist damit auch die Hoffnung verbunden, daß die Langzeit-Sterblichkeit verringert werden kann, wenn eine flächendeckende, zeitnahe Erfolgskontrolle der Dialyse ermöglicht wird. Die gewählte technische Lösung basiert auf der Äquivalenz der Diffusionskoeffizienten von gelöstem Harnstoff und Natriumchlorid. Es ist das zentrale Anliegen dieser Studie, festzustellen, ob das Diffusionsverhalten von NaCl und Harnstoff beim Durchtritt durch die Membran des Dialysefilters gleich ist. Der entscheidende Vorteil, der das Verfahren so leicht handhabbar macht, besteht darin, daß NaCl-Konzentrationen sehr genau durch die ohnehin in großer Zahl in Dialysegeräten verwendeten Leitfähigkeitsmeßzellen bestimmt werden können. Um die NaCl-Massenbilanz über den Dialysefilter zu bestimmen, benötigt man lediglich eine weitere Meßzelle, die stromab des Filters zu installieren ist. Die Messung von Harnstoff, die indirekt über die enzymatische Zerlegung in Ammonium-Ionen und das anschließende Erzeugen eines hoch zu verstärkenden elektrischen Potentials an einer Membran geschieht, ist komplizierter. Zudem ist eine geschlossene Kühlkette für das Enzym sicher zu stellen. Um eine leitfähigkeitsbasierte technische Lösung abzusichern, wurden zwei klinische Studien durchgeführt. In der ersten Studie wurde die Leitfähigkeit in Form von konstanten Stufenprofilen variiert. Sie wurde ausgehend von der Grundlinie für 7 min erhöht und anschließend für 7 min erniedrigt. Das Prinzip einer solchen Messung wurde erstmals 1982 in einer Patentschrift beschrieben. In einer Sequenz von 494 solchen Messungen in 206 automatisch aufgezeichneten Dialysesitzungen an 22 Patienten wurde gefunden, daß sich die Harnstoff- Clearance elektrolytisch mit einer Genauigkeit von -1.46+/-4.75% (Fehler+/-Standardabweichung) messen ließ. Die Messung von Kt/V gemäß dem Ein-Kompartment-Modell ergab eine ähnliche Genauigkeit von 2.88+/-4.15%. Obgleich diese Ergebnisse in Übereinstimmung mit anderen Studien stehen, wurde ein Effekt bemerkt, der nicht in Einklang mit der zunächst bestehenden Theorie zu bringen war. Dieser Effekt besteht darin, daß die Genauigkeit der elektrolytischen Clearancemessung vom beim Patienten vorhandenen Harnstoff-Verteilungsvolumen abhängig war. Weiter war es nicht bedeutungslos, welchen Teil des dreiteiligen Stufenprofils man zur Auswertung heranzog: Den Grundlinie-Hoch- Übergang, den von der Grundlinie zum Niedrig-Nieveau oder den Hoch-Niedrig- Übergang. Dies deutete auf einen Mangel an theoretischem Verständnis hin. Eine genaue weitere Untersuchung führte zu dem Ergebnis, daß unerwünschter NaCl-Transfer vom und zum Patienten die Ursache für die Abhängigkeit vom Verteilungsvolumen war. Es wurde daraufhin die Theorie dahingehend erweitert, daß dieser Effekt korrekt und plausibel beschrieben werden konnte. Aus dieser Erweiterung ergab sich die neue Forderung, den NaCl-Transfer bei der Messung weitestgehend zu minimieren. Die Benutzung von Stufenprofilen stellte hier jedoch an sich eine Limitierung dar, da in der zum Einnehmen eines stabilen Zustandes erforderlichen Zeit zuviel NaCl über die Membran transferiert wurde. Die Konsequenz war, von den Stufenprofilen auf kurze, dynamische Leitfähigkeitsboli überzugehen, die erlaubten, die NaCl-Gabe auf das Maß zu verringern, welches aufgrund der technischen Auflösung erforderlich war. Hierzu mußten jedoch die notwendigen mathematischen Algorithmen neu zugeschnitten werden. Nach diesem Schritt wurde eine weitere klinische Studie gestartet, die den Zweck verfolgte, das neue Verfahren am Patienten zu verifizieren. In dieser Studie mit 10 Patienten und 93 Dialysesitzungen, 264 Stufenprofil- und 173 Bolus-Dialysancemesssungen wurde gefunden, daß die Bolus-Messungen ihre zugehörigen blutseitigen Referenzmessungen mit außergewöhnlicher Genauigkeit von 0.06+/-4.76% trafen. Student's t-Test für gepaarte Daten ergab, daß sich die Datensätze nicht signifikant unterschieden (p=0.87). Die blutseitige Kt/V-Referenz auf der Basis des equilibrierten Einkompartment-Modells mit variablem Volumen wurde mit 5.32+/-3.9% getroffen, wobei eine Korrelation von 0.98 erzielt wurde. Die verbleibende Differenz von 5.32% wird der Vernachlässigung der Harnstoff-Erzeugung während der Messung zugeschrieben. Auch das Stufenprofil zeigte trotz seiner Abhängigkeit vom Verteilungsvolumen gegenüber dem gleichen Modell einen mittleren Fehler von 0.05+/-5% bei einer Korrelation von 0.96. Jedoch konnte es die Vernachlässigung der Harnstoff-Erzeugung nicht korrekt abbilden. Die kontinuierlich aufgenommenen Daten wurden auch nach dem 2-pool Modell untersucht, welches auch die Harnstoff-Erzeugung enthält sowie eine innere Kompartimentierung des Patienten annimmt und damit die tatsächlichen Verhältnisse besser beschreibt. Danach weicht das Bolus-Meßprinzip -3.04+/-14.3% von der Referenz ab (n.s.,p=0.13). Die relativ hohe Standardabweichung wird mit der Komplexität des Modells erklärt. Weiter ist aus der Theorie zum Na-Transfer eine vereinfachende Methode zur Messung des Na-Verteilungsvolumens abgeleitet worden. Diese Methode wurde in-vitro gegen ein Behältnis mit einer bekannten Menge an Dialysat geprüft. Es wurde ein mittlerer Fehler von -19.9+/-34% gefunden. Die Korrelation war 0.92 (n.s., p=0.916). Die gleiche Prüfung fand in-vivo gegen das Harnstoff-Verteilungsvolumen statt und ergab einen mittleren Fehler von -7.4+/-23.2% (r=0.71, n.s., p=0.39). Es hat den Anschein, als würden sich gemäß der Theorie der Dilution die Verteilungsvolumina für Natrium und für Harnstoff scheinbar nur wenig unterscheiden, obwohl sie sich absolut natürlich deutlich unterscheiden. In Anbetracht der erheblichen Vereinfachungen, die bei der Ableitung dieses Ansatzes gemacht wurden, scheint es ausgesprochen ermutigend, auf diesem Weg möglicherweise ein Verfahren entwickeln zu können, welches auf rein elektrolytischem Wege nun nicht mehr nur K, sondern auch V und damit alle zur Quantifizierung gesuchten Größen analytisch ermitteln kann. Weiter wurde im Rahmen dieser Arbeit anhand der analytisch ermittelten Volumina verglichen, ob man mit Hilfe anthropometrischer Formeln zur Ermittlung des Harnstoff-Verteilungsvolumens zu einer guten Abschätzung kommen kann. Es wurde gefunden, daß man das Ergebnis der Watson-Formel um ca. 13% vermindern kann und dann zu einem recht guten Wert für das tatsächliche Harnstoff-Verteilungsvolumen gelangt. Dies ist jedoch mit Vorsicht und Erfahrung zu tun, da sich damit Kt/V rechnerisch zum Nachteil des Patienten verändert. Auch ein elektrolytisches Verfahren mit empirischen Komponenten zur Ermittlung des Plasma-Natriums des Patienten wurde erprobt und konnte mit einer Genauigkeit von 4.3+/-1.2% den Laborwert vorhersagen. Zusammenfassend kann gesagt werden, daß sich im Rahmen dieser Arbeit die leitfähigkeitsbasierten Methoden zur Messung von einigen wichtigen Dialyseparametern als sehr nützlich für die klinische Praxis erwiesen haben und zudem mit keinem Zusatzaufwand für die Beteiligten verbunden sind. Das Ergebnis dieser Arbeit ist mittlerweile in größeren Stückzahlen in frei erhältliche Dialysegeräte implementiert worden. Die Erfahrung der ersten Zeit zeigt, daß das verwendete Prinzip von den Klinikern gut angenommen wird.
Density arrested AKR-2B cells die rapidly in response to serum starvation or treatment by Anisomycin. Cell death is associated with typical hallmarks of apoptosis including membrane blebbing and chromatin condensation but lacks energy dissipation in mitochondria and intranucleosomal fragmentation. During apoptosis a considerable DEVDase activity has been detected which seemed to be represented by a single enzyme. This enzyme had typical effector caspase characteristics, like caspase-3, but exhibited an unusual high KM values of ~100 µM and its large subunit exhibited a molecular weight of 19 kDa, instead of expected 17 kDa. In the present study, this enzyme was identified to be caspase-3 with the help of the generation of recombinant mcaspase-3 protein. N-terminal sequencing of the recombinant mcaspase-3 protein revealed that its prodomain cleavage site differs from that in the human homologue (Asp-9 instead of Asp-28). Thus the large subunit of active caspase-3 was found to be 19 kDa. Furthermore the KM value of recombinant mcaspase-3 was ~100 µM in perfect agreement with that found in cell extracts. Affinity labeling in combination with 2D-GE confirmed that indeed caspase-3 is activated as the main executioner in AKR-2B cells during apoptosis. Since the receptor mediated pathway has already been excluded previously [129], a possible involvement of mitochondria mediated pathway in the activation of caspase-3 was examined. Gel filtration experiments revealed that caspase-3 is mainly eluted as free enzyme and in lower levels within the differently sized high molecular weight complexes of ~600 kDa and 250 kDa in response to serum starvation or Anisomycin treatment. Though the apparent molecular weight of the complexes containing caspase-3 are in accordance with recently published data, they were devoid of Apaf-1 and caspase-9. Apparently, mitochondria mediated pathway is also not involved since neither formation of high molecular weight complexes of Apaf-1 nor cleavage of caspase-9 was observed. Thus, the activation of caspase-3 is caused by a noncanonical pathway during apoptosis. In addition a new 450 kDa complex containing activated caspase-6 was found in response to serum starvation which is clearly separated from caspase-3 containing complexes. Generally caspase-3 has been found to be responsible for most of the morphological changes during apoptosis. One of those is intranucleosomal fragmentation. Although caspase-3 was found to be the main executioner caspase in AKR-2B cells the lack of the intranucleosomal fragmentation led to examine its localization. As detected by overexpression of the Caspase-3-GFP fusion construct in AKR-2B, procaspase-3 was localized in the cytoplasm, wheras the active caspase-3 was mainly found in the membrane blebs and partially in the cytoplasm. Clearly no nuclear localization of active caspase-3 was detected. These data gave first hints on the mechanism of degradation of AKR-2B cells demonstrating that cytoplasmic membrane is the primary site of activation of caspase-3. The possible role of caspase-12 and ER stress mediated pathway of apoptosis was also examined in AKR-2B cells. Kinetic studies showed that caspase-12 is activated at the same time together with caspase-3 in response to serum starvation or Anisomycin treatment resulting in two cleavage products of 47 kDa and 35 kDa, respectively. It was therefore examined whether these two caspases were eluted in the same complexes. Gel filtration experiments revealed that caspase-12 is released as free enzyme during apoptosis. To date all the studies have identified that caspase-12 is specifically activated in response to ER stress. After serum starvation or Anisomycin addition there was no increase of the protein expression level of the chaperone protein Grp 78 which is known to be higly elevated in response to ER stress indicating that both treatments did not lead to ER stress. In contrast treatment with ER stressor substances i.e. Thapsigargin, A23187 (ionophore) induced an ER stress in AKR-2B which lead to unspecifically degradation of caspase-12. Thus it is unlikely that caspase-12 is activated in response to ER stress in AKR-2B cells. However, after the in vitro addition of recombinant caspase-3 to cytosolic extracts caspase-12 is cleaved into 47 kDa and 35 kDa fragments similiar to those observed in vivo. In conclusion the present data demostrated that caspase-12 is activated in AKR-2B cells during apoptosis triggered through pathways that do not involve (the) ER stress and provided evidence that caspase-3 might be involved in activation of caspase-12. Thus the present study in AKR-2B cells gives hints for the existence of additional pathways for apoptosis other than the classical ones.
Priority tasks of the present thesis were to generate various enantiopure C-3-substituted pyroglutamates as well as C-3-substituted glutamates, and furthermore to ameliorate the serious drawback of the bad atom-economy in the reaction sequence of previously published silylether-mediated procedures. To meet these requirements, the ortho ester functionality (OBO ester) developed by Corey was introduced. According to the plan of synthesis, the starting material, non-racemic (S)-pyroglutamic acid, was converted to the corresponding oxetane ester via a DCC-mediated esterification. The latter was N-protected to provide N-acceptor substituted pyroglutamic acid oxetane esters (Acceptor=Boc,Cbz,CO2Me). After rearrangement with boron trifluoride, the ortho ester derivatives (Acceptor=Cbz,CO2Me) were at hand and exclusively the N-Cbz derivative was converted to the corresponding alpha,beta-unsaturated lactam via a syn-elimination reaction. The formation of the C-3-substituted ortho ester compounds (R=methyl,ethyl,butyl,allyl,phenyl,4-chlorophenyl,biphenyl,naphthyl) was performed via a copper-mediated conjugate addition to the alpha,beta-enone system of the N-Cbz-alpha,beta-unsaturated lactam. The OBO functionality hence was envisaged to support perfect trans selectivity in this cuprate addition to the Michael system of the N-Cbz-alpha,beta-unsaturated lactam. Spectroscopic NMR-data, on the basis of 1H-, 13C- and DEPT spectra, proved the assumption that the C-3-substituted ortho ester derivatives exclusively are trans-configurated, i.e. the alkyl derivatives (R=methyl,ethyl,butyl,allyl) are (2S,3S)-configurated and the aryl derivatives (R=phenyl,4-chlorophenyl,biphenyl,naphthyl) are (2S,3R)-configurated). The C-3-substituted ortho ester derivatives were completely deprotected to yield the C-3-substituted pyroglutamates (R=ethyl,phenyl,4-chlorophenyl,naphthyl). Finally, ring opening reaction via route A-2 lead to the desired enantiopure C-3-substituted glutamates. Alternatively, latter preferably were reacted via route A-1 to yield the C-3-substituted glutamates (R=methyl,ethyl,butyl,phenyl,4-chlorophenyl,naphthyl). Their (2S,3R)-configuration (R=aryl) and (2S,3S)-configuration (R=alky), respectively, unambiguously was proved on the basis of available spectroscopic NMR-data. To ensure this assumption, diastereomeric (2S,3R)-3-methyl glutamic acid (i.e. cis-configurated) examplarily was synthesized via route A-3 and spectroscopic NMR-data was compared to that of (2S,3S)-3-methyl glutamic acid (i.e. trans-configurated). Conclusively, there can be recorded the fact that the serious drawback of the bad atom-economy in the reaction sequence previously used can be circumvented by the introduction of the OBO functionality, so the concept of an improved atom-economy is achieved. Additionally, in comparison to the silyl-ether-mediated synthesis, the OBO functionality provided crystalline ortho ester derivatives, which facilitated their purification as well as characterization.
Cardiovascular disease is the leading cause of mortality in both men and women in the Western world. Earlier observations have pointed out that pre-menopausal women have a lower risk of developing cardiovascular disease than age-matched men, with an increase in risk after the onset of menopause. This observation has directed the attention to estrogen as a potential protective factor in the heart. So far the focus of research and clinical studies has been the vascular system, leaving the current knowledge on the role of estrogen in the myocardium itself rather scarce. Functional estrogen receptor-alpha as well as -beta have recently been identified in the myocardium, making the myocardium an estrogen target organ. The focus of this thesis was 1) to investigate the role of estrogen and estrogen receptors in modulating myocardial gene expression both in vivo in an animal model for cardiac hypertrophy (spontaneously hypertensive rats; SHR), as well as in vitro in isolated neonatal cardiomyocytes, 2) to investigate the mechanisms of the rapid induction of an estrogen target gene, the early growth response gene-1 (Egr-1) and 3) to initiate the search for novel estrogen target genes in the myocardium. 1) The effects of estrogen on the expression of one of the major myocardial specific contractile proteins, the alpha-myosin heavy chain (alpha-MHC) have been investigated. In ovarectomised animals treated either with 17beta-estradiol alone or in combination with a specific estrogen receptor antagonist, ICI 182780, it was shown that both alpha-MHC mRNA and protein were upregulated by estrogen in an estrogen receptor specific manner. The in vivo results were confirmed in vitro in isolated neonatal cardiomyocytes which showed that estrogen has a direct action on the myocardium potent enough to upregulate the expression of alpha-MHC. Furthermore it was shown that the alpha-MHC promoter is induced by estrogen in an estrogen receptor-dependent manner and first investigations into the mechanisms involved in this upregulation identified Egr-1 as a potential transcription factor which, upon induction by estrogen, drives the expression of the alpha-MHC promoter. 2) Previously it was shown that Egr-1 is rapidly induced by estrogen in an estrogen receptor-dependent manner which was mediated via 5 serum response elements (SREs) in the promoter region and surprisingly not via the estrogen response elements (EREs). In this study it was shown that estrogen-treatment of cardiomyocytes resulted in the recruitment of serum response factor (SRF), or an antigenically related protein, to the SREs in the Egr-1 promoter, which was specifically inhibited by the estrogen receptor antagonist ICI 182780. Transfection experiments showed that estrogen induced a heterologous promoter consisting only of 5 tandem repeats of the c-fos SRE in an ER-dependent manner, which identified SREs as promoter elements able to confer an estrogen response to target genes. 3) Potentially new target genes regulated by estrogen in vivo were analysed using hearts of ovarectomised animals as well as ovarectomised animals treated with estrogen. Analyses of cDNA microarray filters containing 1250 known genes identified 24 genes that were modified by estrogen in vivo. Among these genes, some might have potentially important functions in the heart and further analyses of these genes will create a more global picture of the role and function of estrogen in the myocardium. Taken together, the results showed that estrogen does have a direct action on the myocardium both by regulating the expression of myocardial specific genes in vivo, as well as exerting rapid non-nuclear effects in cardiac myocytes. It was shown that SREs in the promoter region of genes can confer an estrogen response to genes identifying SREs as important elements in regulation of genes by estrogen. Furthermore, 24 potentially new estrogen targets were identified in the myocardium, contributing to the general understanding of estrogen action in the myocardium.
The hematopoietic-specific Rho-family GTP exchange factor (GEF) Vav-1 is a regulator of lymphocyte antigen receptor signaling and mediates normal maturation and activation of B and T cells. Recent findings suggest that Vav-1 also forms part of signaling pathways required for natural and antibody dependent cellular cytotoxicity (ADCC) of human NK cells. In this study, I show that Vav-1 is also expressed in murine NK cells. Vav-1-/- mice had normal numbers of splenic NK cells, and these displayed a similar expression profile of NK cell receptors as cells from wild type mice. Unexpectedly, IL-2-activated Vav-1-/- NK cells retained normal ADCC. Fc-receptor mediated activation of ERK, JNK, and p38 was also normal. In contrast, Vav-1-/- NK cells exhibited reduced natural cytotoxicity against EL4, C4.4.25, RMA and RMA/S. Together, these results demonstrate that Vav-1 is dispensable for mainstream NK cell development, but is required for NK cell natural cytotoxicity. Vav-2, a protein homologous to Vav-1 has also been implicated in NK cell functions. However, NK cells from Vav-2-/- mice have normal cytotoxic activities and NK cells that lack both Vav-1 and Vav-2 exhibit similar defect as Vav-1-/- cells. Thus Vav-2 has no apparent function in the development and the activation of NK cells. Although NK cell development is normal in Vav-1-/- mice, their numbers of NKT cells were dramatically diminished. Furthermore, NKT cells from Vav-1 mutant mice failed to produce IL-4 and IFNg following in vivo CD3 stimulation. A similar loss of NKT cells was observed in Vav-1-/-Vav-2-/- mice, but not in Vav-2-/- mice, suggesting that only Vav-1, and not Vav-2, is an essential regulator of NKT cell development and NK cell cytotoxicity. Similar to Vav-1, Lsc is a Rho GEF that is expressed specifically in the hematopoietic system. It contains a regulator of G-protein signaling (RGS) domain which negatively regulates the Ga12 and Ga13 subunits of G-protein coupled receptors (GPCRs). This study shows that NK and NKT cell development are normal in Lsc-/- mice. However, NK cells from mutant mice display enhanced cytotoxic responses towards a panel of tumor cells. These data implicate for the first time a RGS-containing Rho GEF in cytotoxic responses and suggest that Lsc down-modulate NK cell activation.
The Church is mandated by Jesus Christ to continue the mission for which he was sent into the world. The mission of Christ, which consists in “bringing the good news to the poor, proclaiming liberty to captives, restoring sight to the blind, setting the downtrodden free and the proclamation of the Lord’s year of favour” , remains the fundamental basis of the missionary and evangelising vocation of the Church. She has a message to proclaim and that message is the proclamation of making the kingdom of God present in the lives of the people. Through the ages the Church has responded to this command of the Lord to evangelise, using various methods according to different situations and times. Dialogue is a conditio sine qua non in the Church’s evangelisation. By con-voking the Second Vatican Council, Pope John gave special attention to the Church’s self-knowledge, that is the knowledge of her nature and vocation as well as the realisation of the necessity of dialogue in the Church’s pursuit of Church unity and healthy relationships with non-Christian religions and bod-ies. Besides the emphases on the importance of dialogue in the Church’s exe-cution of her mission and apostolate of building up the people of God, evi-dence from the human sciences portray the indispensable and invaluable roles of dialogue and communication in a globalised world.
The presented work shows the analysis of the correlation between the spatial and temporal expression pattern of NtAQP1 and its function in water relation in planta. In situ immunological studies indicated NtAQP1-protein accumulation in the root exodermis and endodermis, in the cortex, close to vascular bundles, in the xylem parenchyma and in cells of the stomatal cavities. The aquaporin was also found to be abundant in longitudinal cell-rows in the petioles. Expression studies with generated transgenic plants (Ntaqp1-promoter::gus or luc) confirmed the Ntaqp1 accumulation in the root, stem and petioles but also revealed further localization in pollen grains, adventitious roots and leaf glandular hairs. Ntaqp1-expression was induced during growth processes, like stem bending after gravistimulation or photostimulation, seed germination and hypocotyl elongation as well as during the comparatively fast circadian leaf movement. The expression was further stimulated by phytohormones, especially gibberellic acid (GA) and osmotic stress. Further analysis displayed a diurnal and even circadian expression of Ntaqp1 in roots and petioles. The functional analysis of the aquaporin was accomplished by reverse genetics and biophysical studies. The antisense technique was used to reduce NtAQP1-expression in tobacco plants. The antisense (AS) plants exhibited a severe reduction of Ntaqp1-mRNA, less reduction of the highly homologous NtPIP1a RNA and no effect on expression of other aquaporin family genes (PIP2, TIP). The function of NtAQP1 at the cellular level was investigated by a newly developed experimental setup to record the osmotically induced increase in protoplast volume. The reduction of NtAQP1 by the antisense expression decreased the overall cellular waterpermeability Pos for more than 50 %. Function of NtAQP1 at the whole plant level was e.g. measured by the “high-pressure flow meter method”. Those measurements revealed that the root hydraulic conductivity per unit root surface area (KRA) of roots from the AS-lines was reduced by more than 50 %. KRA displayed a strong diurnal and circadian variation with a maximum in the middle of the light period, similar to the expression pattern of Ntaqp1 in roots. Gas exchange-, stem (Ystem) and leaf (Yleaf) water potential measurement gave dissimilar values in AS and control plants under well-watered conditions. Under a water-limiting environment the Y of AS-plants remained at more negative water values, even though a further decrease in transpiration of AS-plants was detected. Quantitative analysis displayed a much stronger wilting reaction in the AS than in the control plants. Quantitative studies of the leaf movement in AS compared to control plants exhibited a dramatic reduction in velocity and also in the extent of the process. The following conclusions can be drawn. NtAQP1 was expressed at sites of anticipated high water fluxes from and to the apoplast or symplast. Additionally, the specific distribution pattern and temporal expression of NtAQP1 in petioles and the bending stem strongly indicate a role in transcellular movement of water. The reduction of NtAQP1 by the antisense expression decreased the overall cellular Pos. Conclusively, NtAQP1-function increases membrane water permeability of tobacco root protoplasts. The decrease of the specific root hydraulic conductivity (KRA) was in the same order of magnitude as the mean cellular water permeability reduction, indicating that aquaporin expression is essential in maintaining a natural root hydraulic conductance. Reduction of KRA in AS plants might be the first definitive proof that the pathway of water uptake from the root surface to the xylem involves passage across membranes. The absence of NtAQP1 resulted in a water stress signal, causing a certain stomatal closure. NtAQP1 seems to contribute to water stress avoidance in tobacco. NtAQP1 plays an essential role in fast plant movements and transcellular water shift.
Transforming-Growth-Factor-beta1 (TGF-b1) is a multifunctional cytokine that regulates cell growth and differentiation in many types of cells. TGF-b1 is especially known to exert a variety of regulatory functions in the immune system, such as T cell differentiation and T cell function. Signal transduction of TGF-b1 is mediated by phosphorylation of receptorassociated Smad proteins (R-Smads). R-Smads are phosphorylated by the activated type I receptor, which is itself phosphorylated by the high affinity type II receptor upon ligand binding. The phosphorylated R-Smads then associate with Co-Smads. Heterooligomers of R- and Co-Smads translocate into the nucleus where they regulate transcription of target genes in concert with other transcription factors such as CBP/p300 or AP-1. Recent findings suggest that the pleiotropic effects of TGF-b1 are conferred by crosstalks to other signal transduction pathways such as the MAP-kinases or the STAT-pathway. Here we describe the effect of long-term exposure to TGF-b1 on the effector function of differentially stimulated primary murine splenocytes and purified primary murine CD8+ cytotoxic T cells. Long-term exposure to TGF-b1 results in non-responsiveness to TGF-b1- induced Smad2 phosphorylation. This is seen either by no phosphorylation or sustained phosphorylation of Smad2. Furthermore, we observed a strong correlation between sustained Smad2 phosphorylation and resistance to TGF-b1 mediated growth inhibition. In contrast, splenocyte cultures strongly growth inhibited by TGF-b1 showed no Smad2 phosphorylation. Lytic activity of these cultures, however, was found to be suppressed regardless of proliferation properties and Smad2 phosphorylation pattern. We also describe that a functional MEK-1 pathway is a prerequisite for rendering murine splenocytes unresponsive to TGF-b1 mediated growth inhibition, and that inhibition of the MEK-1 cascade alters the Smad2 phosphorylation pattern. In addition, we show that resistance to TGF-b1 mediated growth inhibition correlates with the activation of the JNK pathway. However, the resistant phenotype was found unable to be reverted upon administration of exogeneous IFNg and/or aCD28 antibody. In human or mouse T cell lines, however, the described correlation between the type of stimulation and TGF-b growth resistance or growth sensitivity is not present. Thus, this correlation is specific for primary T cells. We also cloned a chimeric dominantnegative TGF-b receptor which is coupled to a suicide gene, in order to render T cells resistant to TGF-b mediated effects.These findings shed light on how TGF-b1 mediates its immunosuppressive role, and may help to gain knowledge of averting these TGF-b1 effects in the course of tumor therapy.
Characterization of memories and ignorant (S6KII) mutants in operant conditioning in the heat-box
(2002)
Learning and memory processes of operant conditioning in the heat-box were analysed. Age, sex, and larval desity were not critical parameters influencing memory, while low or high activity levels of flies were negatively correlated with their performance. In a search for conditioning parameters leading to high retention scores, intermittent training was shown to give better results than continuous training. As the memory test is the immediate continuation of the conditioning phase just omitting reinforcement, we obtain a memory which consists of two components: a spatial preference for one side of the chamber and a stay-where-you-are effect in which the side preference is contaminated by the persistence of heat avoidance. Intermittent training strengthens the latter. In the next part, memory retention was investigated. Flies were trained in one chamber and tested in a second one after a brief reminder training. With this direct transfer, memory scores reflect an associative learning process in the first chamber. To investigate memory retention after extended time periods, indirect transfer experiments were performed. The fly was transferred to a different environment between training and test phases. With this procedure an after-effect of the training was still observed two hours later. Surprisingly, exposure to the chamber without conditioning also lead to a memory effect in the indirect transfer experiment. This exposure effect revealed a dispositional change that facilitates operant learning during the reminder training. The various memory effects are independent of the mushroom bodies. The transfer experiments and yoked controls proved that the heat-box records an associative memory. Even two hours after the operant conditioning procedure, the fly remembers that its position in the chamber controls temperature. The cAMP signaling cascade is involved in heat-box learning. Thus, amnesiac, rutabaga, and dunce mutants have an impaired learning / memory. Searching for, yet unknown, genes and signaling cascades involved in operant conditioning, a Drosophila melanogaster mutant screen with 1221 viable X-chromosome P-element lines was performed. 29 lines with consistently reduced heat avoidance/ learning or memory scores were isolated. Among those, three lines have the p[lacW] located in the amnesiac ORF, confirming that with the chosen candidate criteria the heat-box is a useful tool to screen for learning and /or memory mutants. The mutant line ignP1 (8522), which is defective in the gene encoding p90 ribosomal S6 kinase (S6KII), was investigated. The P-insertion of line ignP1 is the first Drosophila mutation in the ignorant (S6KII) gene. It has the transposon inserted in the first exon. Mutant males are characterized by low training performance, while females perform well in the standard experiment. Several deletion mutants of the ignorant gene have been generated. In precise jumpouts the phenotype was reverted. Imprecise jumpouts with a partial loss of the coding region were defective in operant conditioning. Surprisingly, null mutants showed wild-type behavior. This might indicate an indirect effect of the mutated ignorant gene on learning processes. In classical odor avoidance conditioning, ignorant null mutants showed a defect in the 3-min, 30-min, and 3-hr memory, while the precise jumpout of the transposon resulted in a reversion of the behavioral phenotype. Deviating results from operant and classical conditioning indicate different roles for S6KII in the two types of learning.
Transforming growth factor-ß (TGF-ß) is a multifunctional cytokine that is engaged in regulating versatile cellular processes that are pivotal for development and homeostasis of most tissues in multicellular organisms. TGF-ß signal transduction is initially propagated by binding of TGF-ß to transmembrane serine/threonine kinase receptors, designated TßRI and TßRII. Upon activation, the receptors phosphorylate Smad proteins which serve as downstream mediators that enter the nucleus and finally trigger transcriptional responses of specific genes. During the past years, it became evident that signaling cascades do not proceed in a linear fashion but rather represent a complex network of numerous pathways that mutually influence each other. Along these lines, members of the TGF-ß superfamily are attributed to synergize with neurotrophins. Together, they mediate neurotrophic effects in different populations of the nervous system, suggesting that an interdependence exists between TGF-ßs on the one hand and neurotrophins on the other. In the present work, the crosstalk of NGF and TGF-ß/Smad signaling pathways is characterized in rat pheochromocytoma cells (PC12) which are frequently used as a model system for neuronal differentiation. PC12 cells were found to be unresponsive to TGF-ß due to limiting levels of TßRII. However, stimulation with NGF results in initiation of Smad-mediated transcription independent of TGF-ß. Binding of NGF to functional TrkA receptors triggers activation of Smad3. This NGF-dependent Smad activation occurs by a mechanism which is different from being induced by TGF-ß receptors in that it provokes a different phosphorylation pattern of R-Smads. Together with an inferior role of TßRI, Smad3 is proposed to serve as a substrate for cellular kinases other than TßRI. Based on the presented involvement of components of both, the MAPK/Erk and the TAK1/MKK6 cascade, signal mediators of these pathways rank as candidates to mediate direct activation of Smad3. Smad3 is subsequently translocated to the nucleus and activates transcription in a Smad4-dependent manner. Negative regulation is provided by Smad7 which was found to act as a potent inhibitor of Smad signaling not only in TGF-ß- but also in NGF-mediated cascades. The potential of NGF to activate the Smad pathway independent of TGF-ß might be of special importance in regulating expression of genes that are essential for the development and function of neuronal cells or of other NGF-sensitive cells, in particular those which are TGF-ß-resistant.
This theses deals with the syntheses and the coordination behaviour of polyimidosulfur anions like S(NR)32–, S(NR)42–, RS(NR)2– or RS(NR)3–, the nitrogen analogues of the well known oxo-anions SO32–, SO42–, RSO2– and RSO3–. The first aim was the synthesis of a triimidosulfite with three different NR-substituents, a so called asymmetrical triimidosulfite. In all reactions, that have been carried out to obtain a triimidosulfite with three (or two) different residues at nitrogen, the final product was always the dilithium sulfide adduct. The syntheses of chiral alkylenediimidosulfites was successful. Similar to Corey’s S-ylides (R2(O)S+––CR2) and Wittig’s phosphonium ylides (R3P+––CR2) these molecules contain a positively charged sulfur atom next to a carbanionic centre. The structures of the alkylenediimidosulfites are not influenced by the different substituents at nitrogen and carbon, respectively. In each case a doublecubic structure is received. The first members of a completely new class of compounds were synthesised: the aryl-bis-(diimidosulfinates). In this compounds two SN2 units are connected via a heteroaromatic linker, containing a potential donor centre in metal coordination. They represent, like the known alkyldiimidosulfinates, dipodal monoanionic ligands. In the field of sulfur (VI) chemistry the syntheses of aryltriimidosulfonates were successful. Hitherto it was believed, that only spatial less demanding lithium organics could be added to a S=N double bond in S(NtBu)3. This assumption was confirmed by the fact that methyl- and phenylacetylene-triimidosulfonate were the only known alkylsulfonates. Nevertheless, the addition of several lithiumheteroarenes to sulfurtriimide worked without difficulties. If the shape of the nucleophile permits to slot in between the NtBu substituents and to approach the electrophilic sulfur in the sulfurtriimide from the side rather than in an orthogonal angle, the addition reaction works smoothly. Although the steric demand of the tris(tert.-butyl)triimidosulfonate unit is very high, the synthesis of thiophene-bis-(triimidosulfonate) worked. The sulfonate moieties function as dipodal ligands.
Nowadays, robotics plays an important role in increasing fields of application. There exist many environments or situations where mobile robots instead of human beings are used, since the tasks are too hazardous, uncomfortable, repetitive, or costly for humans to perform. The autonomy and the mobility of the robot are often essential for a good solution of these problems. Thus, such a robot should at least be able to answer the question "Where am I?". This thesis investigates the problem of self-localizing a robot in an indoor environment using range measurements. That is, a robot equipped with a range sensor wakes up inside a building and has to determine its position using only its sensor data and a map of its environment. We examine this problem from an idealizing point of view (reducing it into a pure geometric one) and further investigate a method of Guibas, Motwani, and Raghavan from the field of computational geometry to solving it. Here, so-called visibility skeletons, which can be seen as coarsened representations of visibility polygons, play a decisive role. In the major part of this thesis we analyze the structures and the occurring complexities in the framework of this scheme. It turns out that the main source of complication are so-called overlapping embeddings of skeletons into the map polygon, for which we derive some restrictive visibility constraints. Based on these results we are able to improve one of the occurring complexity bounds in the sense that we can formulate it with respect to the number of reflex vertices instead of the total number of map vertices. This also affects the worst-case bound on the preprocessing complexity of the method. The second part of this thesis compares the previous idealizing assumptions with the properties of real-world environments and discusses the occurring problems. In order to circumvent these problems, we use the concept of distance functions, which model the resemblance between the sensor data and the map, and appropriately adapt the above method to the needs of realistic scenarios. In particular, we introduce a distance function, namely the polar coordinate metric, which seems to be well suited to the localization problem. Finally, we present the RoLoPro software where most of the discussed algorithms are implemented (including the polar coordinate metric).
The extracellular matrix within connective tissues represents a structural scaffold as well as a barrier for motile cells, such as invading tumor cells or passenger leukocytes. It remains unclear how different cell types utilize matrix-degrading enzymes for proteolytic migration strategies and, on the other hand, non-proteolytic strategies to overcome 3D fibrillar matrix networks. To monitor cell migration, a 3D collagen model in vitro or the mouse dermis in vivo were used, in combination with time-lapse video-, confocal- or intravital multiphoton-microscopy, and computer-assisted cell tracking. Expression of proteases, including several MMPs, ADAMs, serine proteases and cathepsins, was shown by flow cytometry, Western blot, zymography, and RT-PCR. Protease activity by migrating HT-1080 fibrosarcoma cells resulting in collagenolysis in situ and generation of tube-like matrix defects was detected by three newly developed techniques:(i) quantitative FITC-release from FITC-labelled collagen, (ii) structural alteration of the pyhsical matrix structure (macroscopically and microscopically), and (iii) the visualization of focal in situ cleavage of individual collagen fibers. The results show that highly invasive ollagenolytic cells utilized a spindle-shaped "mesenchymal" migration strategy, which involved beta1 integrindependent interaction with fibers, coclustering of beta1 integrins and matrix metalloproteinases (MMPs) at fiber bundling sites, and the proteolytic generation of a tube-like matrix-defect by MMPs and additional proteases. In contrast to tumor cells, activated T cells migrated through the collagen fiber network by flexible "amoeboid" crawling including a roundish, elliptoid shape and morphological adaptation along collagen fibers, which was independent of collagenase function and fiber degradation. Abrogation of collagenolysis in tumor cells was achieved by a cocktail of broad-spectrum protease inhibitors at non-toxic conditions blocking collagenolysis by up to 95%. While in T cells protease inhibition induced neither morphodynamic changes nor reduced migration rates, in tumor cells a time-dependent conversion was obtained from proteolytic mesenchymal to non-proteolytic amoeboid migration in collagen lattices in vitro as well as the mouse dermis in vivo monitored by intravital microscopy. Tumor cells vigorously squeezed through matrix gaps and formed constriction rings in regions of narrow space, while the matrix structure remained intact. MMPs were excluded from fiber binding sites and beta1 integrin distribution was non-clustered linear. Besides for fibrosarcoma cells, this mesenchymal-toameboid transition (MAT) was confirmed for epithelial MDA-MB-231 breast carcinoma cells. In conclusion, cells of different origin exhibit significant diversity as well as plasticity of protease function in migration. In tumor cells, MAT could respresent a functionally important cellular and molecular escape pathway in tumor invasion and migration.
The thesis consists of two major parts. The first part contains a theoretical-experimental study of confocal micro-Raman spectroscopy on hybrid polymer coatings and an application of this spectroscopic method on PDMS-membranes. The theoretical-experimental study includes the application of a model that describes the influence of the refraction effect on the focus length on confocal Raman experiments, and the development of a new model that additionally takes into account the effect of diffraction on the focus dimensions. A parallel comparison between these two theoretical approaches and experimental data has been also drawn and a better agreement between theory and experiment was observed, when both refraction and diffraction effects were considered. Further, confocal resonance micro-Raman spectroscopy has been applied to characterise the diffusion processes of pharmacologically relevant molecules (b-carotene dissolved in dimethylsulfoxide) through a polydimethylsiloxane (PDMS)-membrane. The diffusion rate as a function of the measurement depth and diffusion time as well as the concentration gradient under a steady flux have been determined. The measurements shown that the confocal micro-Raman technique is a powerful tool to investigate the kinetics of diffusion processes within a membrane before the steady state has been reached. The second part of the thesis contains infrared and Raman spectroscopic studies of copper and iron doped B2O3-Bi2O3 glass systems. These studies were performed to obtain specific data regarding their local structure and the role played by dopant ions on boron and bismuthate units. The changes of B2O3 and Bi2O3 structural units due to the relaxation of the amorphous structure, which was induced in these samples by the thermal treatment, were also evidenced.
The thesis contains two major parts. The first part deals with structural investigations on different coordination compounds performed by using infrared absorption and FT-Raman spectroscopy in combination with density functional theory calculations. In the first section of this part the starting materials Ph2P-N(H)SiMe3 and Ph3P=NSiMe3 and their corresponding [(MeSi)2NZnPh2P-NSiMe3]2 and Li(o-C6H4PPh2NSiMe3)]2·Et2O complexes have been investigated in order to determine the influence of the metal coordination on the P–N bond length. In the next section the vibrational spectra of four hexacoordinated silicon(IV) and germanium(IV) complexes with three symmetrical bidentate oxalato(2-) ligands have been elucidated. Kinetic investigations of the hydrolysis of two of them, one with silicon and another one with germanium, have been carried out at room temperature and at different pH values and it was observed that the hydrolysis reaction occurs only for the silicon compound, the fastest reaction taking place at acidic pH. In the last section of this part, the geometric configurations of some hexacoordinated silicon(IV) complexes with three unsymmetrical bidentate hydroximato(2-) ligands have been determined. The second part of the thesis contains vibrational investigations of some biologically active molecules performed by means of Raman spectroscopy together with theoretical simulations. The SER spectra of these molecules at different pH values have also been analysed and the adsorption behaviour on the metal surface as well as the influence of the pH on the molecule-substrate interaction have been established.
The explosive expansion of the population of the Metropolitan Region of Curitiba raised a high increase in the demand for water resources and the uncontrolled settlement poses a large problem for the environment. The greatest menace to the water supply sources of this region is the urban occupation (invasion) into the areas that contain these resources. This occupation continues with its slow, silent, although progressive march, threatening precious and irreplaceable resources. From this background an area in the direct vicinity north-east of Curitiba has been studied. In this area a drinking water reservoir was constructed in the time that the study took place in the Iraí-basin. The Iraí-reservoir even though an area around the lake will be protected may be polluted by two tributaries which flow through more or less densely populated areas. In the study area on the same time wells have been constructed. To estimate what the impact may be from the possibly polluted reservoir on the aquifer a groundwater flow model has been constructed. On the same time to estimate the water balance and the spatial distribution of pollution vulnerability the hydrological model MODBIL has been used. Also other methods have been used to estimate the pollution vulnerability to make a comparison and because none of the methods takes every aspect into account. With the calibrated groundwater flow model for the situation before the construction of the Iraí-reservoir and after its construction, simple particle tracking transport models are constructed as scenarios how the water of the aquifer may be influenced.
Epidermolysis bullosa acquisita (EBA) is an autoimmune subepidermal blistering disease associated with autoantibodies to type VII collagen, the major constituent of anchoring fibrils. Previous attempts to demonstrate the blister inducing potential of autoantibodies to this protein have failed. To address this question, we used an in vitro model involving cryosections of human skin incubated with patients’ autoantibodies and leukocytes from healthy donors. We show that sera from 14 out of 16 EBA patients, in contrast to sera from healthy controls, induced dermal-epidermal separation in the cryosections. The level of the experimentally induced split localizes to the lamina lucida of the dermal-epidermal junction. Recruitment and activation of neutrophils at the dermal-epidermal junction was necessary for split induction, whereas mononuclear cells were not required. Importantly, patients’ autoantibodies affinity-purified against a recombinant form of the non-collagenous 1 (NC1) domain of type VII collagen retained their blister-inducing capacity, while patients’ IgG that was depleted of reactivity to type VII collagen lost this ability. Monoclonal antibody LH7.2 to the NC1 domain of type VII collagen also induced subepidermal splits in the cryosections; F(ab’)2 fragments of autoantibodies to type VII collagen were not pathogenic. These findings demonstrate the capacity of autoantibodies to type VII collagen to trigger an Fcg-dependent inflammation leading to split formation in cryosections of human skin.
We consider homogeneous spaces G/H with the same rational homotopy as a product of a 1-sphere and a (m+1)-sphere. We show that these spaces have also the rational cohomology of such a sphere product if H is connected and if the quotient has dimension m+2. Furthermore, we prove that if additionally the fundamental group of G/H is cyclic, then G/H is locally a product of a 1-torus and ofA/H, where A/H is a simply connected rational cohomology (m+1)-sphere (and hence classified). If H fails to be connected, then with U as the connected component of H the G-action on the covering space G/U of G/H has connected stabilizers, and the results apply to G/U. To show that under the assumptions above every natural number may be realized as the order of the group of connected components of H we calculate the cohomology of certain homogeneous spaces. We also determine the rational cohomology of the fibre bundle U-->G-->G/U if G/H meets the assumptions above. This is done by considering the respective Leray-Serre spectral sequence. The structure of the cohomology of U-->G-->G/U then gives a second proof for the structure of compact connected Lie groups acting transitively on spaces with the rational homotopy of a product of a 1-sphere and a (m+1)-sphere. Since a quotient of a homogeneous space with the same rational homotopy or cohomology as a product of a 1-sphere and a (m+1)-sphere is not simply connected, there often arises the question whether or not a considered fibre bundle or fibration is orientable. A large amount of space will therefore be given to the problem of showing that certain fibrations are orientable. For compact connected (m+2)-manifolds with cyclic fundamental groups and with the rational homotopy of a product of a 1-sphere and a (m+1)-sphere we show the following: if a connected Lie group acts transitively on the manifold, then the maximal compact subgroups are either transitive, or their orbits are simply connected rational cohomology spheres of codimension 1. Homogeneous spaces with the same rational cohomology or homotopy as a a product of a 1-sphere and a (m+1)-sphere play a role in the study of different types of geometrical objects. They appear for example as focal manifolds of isoparametric hypersurfaces with four distinct principal curvatures. Further examples of such spaces are the point spaces and the line spaces of compact connected generalized quadrangles. We determine the isometry groups of isoparametric hypersurfaces with 4 principal curvatures of multiplicities 1 and m which are transitive on the focal manifold with non-trivial fundamental group. Buildings were introduced by Jacques Tits to give interpretations of simple groups of Lie type. They are a far-reaching generalization of projective spaces, in particular a generalization of projective planes. There is another generalization of projective planes called generalized polygons. A projective plane is the same as a generalized triangle. The generalized polygons are also contained in the class of buildings: they are the buildings of rank 2. To compact quadrangles one can assign a pair of natural numbers called the topological parameters of the quadrangles. We treat the case k=1. It turns out that there are no other point-transitive compact connected Lie groups for (1,m)-quadrangles than the ones for the real orthogonal quadrangles. Furthermore, we solve the problem of three infinite series of group actions which Kramer left as open problems; there are no quadrangles with the homogeneous spaces in question as point spaces (up to maybe a finite number of small parameters in one of the three series).
A significant relatedness is of fundamental importance for the evolution and maintenance of social life (kin selection theory, Hamilton 1964a,b). Not only kin selection itself, but also more complex evolutionary theories make predictions on the occurrence of conflict and co-operation in animal societies. They all depend on the genetic relationships among individuals. Therefore, the study of unrelated, co-operating individuals provides a unique opportunity to critically test predictions based on these evolutionary theories. Using allozyme electrophoresis, the study species Pachycondyla villosa was found to represent three different species. Young queens in one of these species, provisionally called Pachycondyla cf. inversa, may co-operate during colony founding (pleometrosis). Approximately 50 per cent of all founding colonies collected near Itabuna, Brazil, consisted of two to five founding queens. Queens of P. cf. inversa have to forage for food (semi-claustral founding), and in founding associations only one queen specialised for this risky task. A microsatellite study showed that nestmate queens were typically not related. How can a division of labour be achieved, where one individual performs risky tasks to the favour of another individual to which it is not related? In contrast to the predictions made by group selectionists, this study provided clear evidence that the division of labour among co-foundresses of P. cf. inversa results from social competition: Co-foundresses displayed aggressive interactions and formed dominance hierarchies which predominantly served to force subordinates to forage. The frequency of queen antagonism increased with the duration since food was last added to the foraging arena. The social status was not, or only weakly associated with the reproductive status: As predicted by the reproductive skew theory, all foundresses laid eggs at similar rates, though the subordinate may be harassed during egg laying and occasionally, some of her eggs may be eaten by the dominant. The differential oophagy presumably was also reflected in a microsatellite study of foundress associations, which was conducted shortly after the first workers emerged: Here, the co-foundresses occasionally contributed unequally to the colony’s workers. Conflicts among workers or between workers and queens, e.g. over the division of labour or sex ratio, strongly depend on the genetic relationships among members of a colony. The number of two to five co-founding queens in polygynous colonies of P. cf. inversa, and the lack of relatedness among them, should lead to a decrease in the relatedness of workers. However, nestmate workers were closely related. Furthermore, worker relatedness may decrease as several queens were found to be multiply inseminated. Inbreeding coefficients were significantly different from zero in both queens and workers. No evidence for a geographical substructuring of the population was found. The deviation from random mating presumably was probably due to small, localised nuptial flights. Virgin queens do not mate near their natal nest and disperse before founding colonies. The analysis of cuticular hydrocarbons obtained from live queens revealed consistent differences between the patterns of cuticular hydrocarbons of queens with high vs. low rank: only high-ranking queens showed considerable amounts of cuticular pentadecane (n-C15) and heptadecene (n-C17:1). The presence of the two substances apparently was not associated with reproductive status. It is not yet known, if the two substances indeed serve to communicate high social status in P. cf. inversa. In experimentally assembled associations of two founding queens, queens engaged in aggressive interactions which already within one to twenty minutes resulted in stable dominance hierarchies. The queens attacking first usually won the contest and became dominant. Nest ownership at least for a couple of days did not influence the outcome of dominance interactions in the laboratory experiments, whereas queen body size apparently played an important role: In all eight trials, the larger queen became dominant. However, dominant queens from natural foundress associations were on average not larger than subordinates, suggesting that in the field, resident asymmetries might override size asymmetries only after a more prolonged period of nest ownership. Sequencing of the COI/COII region of mitochondrial DNA displayed sufficient variability for the study of the sociogenetic structure of the secondarily polygynous ant Pachycondyla obscuricornis: Six different haplotypes could be distinguished among six workers of different colonies from one study population in Costa Rica. The variability of other methods which were established (RFLPs, microsatellites, allozymes, and multilocus DNA fingerprinting) was too low for a further study on the genetic structure in P. obscuricornis.
Division of reproductive labour in societies represents a topic of interest in evolutionary biology at least since Darwin. The puzzle of how helpers can be selected for, in spite of their reduced fertility has found an explanation in the kin selection theory: workers can overcome the cost of helping and of forgiving direct reproduction by rearing sufficiently related individuals. However, in the Hymenoptera, little is known on the proximate mechanisms that regulate the division of labour in colonies. Our knowledge is based on several "primitive" ants from the subfamily Ponerinae and two highly eusocial Hymenoptera species. In the former, the dominance hierarchies allowing for the establishment of individuals as reproductives are well understood. In contrast, the pheromonal mechanisms that help maintain their reproductive status are not understood. Similarly in "higher" ants, pheromonal regulation mechanisms of worker reproduction by queens remain largely unknown. The aim of this study is to determine the modalities of production, distribution and action, as well as the identity of the queen pheromones affecting worker reproduction in the ant Myrmecia gulosa. This species belongs to the poorly studied subfamily Myrmeciinae, which is endemic to the Australian region. The subfamily represents, together with the Ponerinae, the most "primitive" ants: their morphology is close to that of the hypothetical ancestor of ants, and the specialisation of queens is weaker than that of "higher" ants. Simple regulation mechanisms were therefore expected to facilitate the investigation. The first step in this study was to characterise the morphological specialisation of queens and workers, and to determine the differences in reproductive potential associated with this specialisation. This study contributes to our understanding of the link between regulation of division of reproductive labour and social complexity. Furthermore, it will help shed light on the reproductive biology in the poorly known subfamily Myrmeciinae. Queens were recognised by workers on the basis of cuticular as well as gland extracts or products. What is the exact function of the multiple pheromones identified and how they interact remains to be determined. This could help understand why queen "signal" in a "primitive" ant with weakly specialised queens such as M. gulosa appears to be as complex as in highly eusocial species. Primer pheromones act on workers? physiology and have long-term effect. Whether workers of M. gulosa reproduce or not is determined by the detection of a queen pheromone of this type. Direct physical contact with the queen is necessary for workers to detect this pheromone. Thus, the colony size of M. gulosa is compatible with a simple system of pheromone perception by workers based on direct physical contact with the queen. When prevented from establishing physical contact with their queen, some workers start to reproduce and are policed by nestmates. The low volatility of the cuticular hydrocarbons (CHCs), their repartition over the entire cuticle and the existence of queen and worker specific CHC profiles suggest that these chemicals constitute a queen pheromone. Importance of HC versus non-HC compounds was confirmed by bioassaying purified fraction of both classes of chemicals. This study demonstrates for the first time that purified HCs indeed are at the basis of the recognition of reproductive status. This supports the idea that they are also at the basis of the recognition of queens by their workers. As CHCs profiles of workers and queens become similar with acquisition of reproductive status, they represent honest fertility markers. These markers could be used as signals of the presence of reproductives in the colonies, and represent the basis of the regulation of division of reproductive labour.
This study investigates the foraging behaviour of grass-cutting ants, Atta vollenweideri, with specific consideration of the following issues: (a) cutting behaviour and the determination of fragment size, (b) the effect of load size on transport economics, (c) division of labour and task-partitioning. Grass-cutting ants, Atta vollenweideri, harvest grass fragments that serve as substrate for the cultivation of a symbiotic fungus. Foragers were observed to cut grass fragments across the blade, thus resulting in longish, rectangular-shaped fragments in contrast to the semicircular fragments of leaf-cutting ants. Cutting was very time-consuming: In tough grasses like the typical grassland species Paspallum intermedium and Cyperus entrerrianus, cutting times lasted up to more than 20 minutes per fragment and roughly half of all initiated cutting attempts were given up by the ants. Foragers harvesting the softer grass Leersia hexandra were smaller than those foraging on the hard grasses. Fragment size determination and the extent of size-matching between ant body size and fragment size was investigated regarding possible effects of tissue toughness on decision-making and as a function of the distance from the nest. Tissue toughness affected decision-making such that fragment width correlated with ant body mass for the hard grass but not for the soft one, suggesting that when cutting is difficult, larger ants tend to select wider grasses to initiate cutting. The length of the fragments cut out of the two grass species differed statistically, but showed a large overlap in their distribution. Distance from the nest affected load size as well as the extent of size-matching: Fragments collected directly after cutting were significantly larger than those carried on the trail. This indicates that fragments were cut once again on their way to the nest. Size-matching depended on the trail sector considered, and was stronger in ants sampled closer to the nest, suggesting that carriers either cut fragments in sizes corresponding to their body mass prior transport, or transferred them to nestmates of different size after a short carrying distance. During transport, a worker takes a fragment with its mandibles at one end and carries it in a more or less vertical position. Thus, load length might particularly affect maneuverability, because of the marked displacement of the gravitational center. Conversely, based on the energetic of cutting, workers might maximise their individual harvesting rate by cutting long grass fragments, since the longer a grass fragment, the larger is the amount of material harvested per unit cutting effort. I therefore investigated the economics of load transport by focusing on the effects of load size (mass and length) on gross material transport rate to the nest. When controlling for fragment mass, both running speed of foragers and gross material transport rate was observed to be higher for short fragments. In contrast, if fragment mass was doubled and length maintained, running speed differed according to the mass of the loads, with the heavier fragments being transported at the lower pace. For the sizes tested, heavy fragments yielded a higher transport rate in spite of the lower speed of transport, as they did not slow down foragers so much that it counterbalanced the positive effects of fragment mass on material transport rate. The sizes of the fragments cut by grass-cutting ants under natural conditions therefore may represent the outcome of an evolutionary trade-off between maximising harvesting rate at the cutting site and minimising the effects of fragment size on material transport rates. I investigated division of labour and task partitioning during foraging by recording the behaviour of marked ants while cutting, and by monitoring the transport of fragments from the cutting until they reached the nest. A. vollenweideri foragers showed division of labour between cutting and carrying, with larger workers cutting the fragments, and smaller ones transporting them. This division was absent for food sources very close to the nest, when no physical trail was present. Along the trail, the transport of fragment was a partitioned task, i.e., workers formed bucket brigades composed of 2 to 5 carriers. This sequential load transport occurred more often on long than on short trails. The first carriers of a bucket brigade covered only short distances before dropping their fragments, turned back and continued foraging at the same food source. The last carriers covered the longest distance. There was no particular location on the trail for load dropping , i.e., fragments were not cached. I tested the predictions of two hypotheses about the causes of bucket brigades: First, bucket brigades might occur because of load-carriage effects: A load that is too big for an ant to be carried is dropped and carried further by nestmates. Second, fragments carried by bucket brigades might reach the nest quicker than if they are transported by a single carrier. Third, bucket brigades might enhance information flow among foragers: By transferring the load a worker may return earlier back to the foraging site and be able to reinforce the chemical trail, thus recruitment. In addition, the dropped fragment itself may contain information for unladen foragers about currently harvested sources and may enable them to choose between sources of different quality. I investigated load-carriage effects and possible time-saving by presenting ants with fragments of different but defined sizes. Load size did not affect frequency of load dropping nor the distance the first carrier covered before dropping, and transport time by bucket brigades was significantly longer than by single carriers. In order to study the information transfer hypothesis, I presented ants with fragments of different attractivity but constant size. Ants carrying high-quality fragments would be expected to drop them more often than workers transporting low-quality fragments, thus increasing the frequency of bucket brigades. My results show that increasing load quality increased the frequency of bucket brigades as well as it decreased the carrying distance of the first carrier. In other words, more attractive loads were dropped more frequently and after a shorter distance than less attractive ones with the first carriers returning to the foraging site to continue foraging. Summing up, neither load-carriage effects nor time-saving caused the occurrence of bucket brigades. Rather, the benefit might be found at colony level in an enhanced information flow.
S=N versus S+-N-
(2002)
The main aim of this thesis was to characterise structurally four sulfur-nitrogen compounds in terms of their experimental electron density distribution: Sulfurdiimide S(NtBu)2 (I), sulfurtriimide S(NtBu)3 (II), methyl(diimido)sulfinic acid H(NtBu)2SMe (III) and methylene-bis(triimido)sulfonic acid CH2{S(NtBu)2(HNtBu)}2 (IV). The electron density was determined by multipole refinements on high-resolution X-ray data at low temperatures. The refined densities were analysed by means of Bader’s theory of ‘Atoms in Molecules’ to get information about the bonding types (shared/ closed shell), bond strengths, and the extent of polarisation. The distributions of the static deformation densities, which already showed the most important electronical features as lone-pairs and bonding densities, were calculated for all compounds. The spatial distributions provided a first impression about the bonding properties. The nitrogen lone-pair densities were found to be inclined towards the electropositive sulfur atoms. In II, III and IV the spatial distributions already suggested sp3 hybridisation of the nitrogen atoms. In I gradual differences between the E/Z and Z/Z oriented NtBu groups were visualised. The charge density distribution was analysed along the bond paths, which showed some of the S,N bonds to be considerably bent. In the central part of the thesis detailed topological analyses of the electron density distributions were performed. All BCPs and the related electronical properties as the electron density, the negative Laplacian, the eigenvalues of the Hessian matrix, and several values, which can be deduced from these, were calculated. Due to the low number of comparable published compounds, internal scaling facilitated by III and IV led to system-specific ranking of the S-N and S-C bonds in terms of bond type (shared vs. closed shell), bond order, and bond strength. To quantify bond polarisation a criterion was developed which relates shifts in the BCPs to electron transfer from the electropositive to the electronegative bonding partner. The distributions of the Laplacian were determined for all S-E (E = N, C) bonds because of their fundamental importance for the classification of atomic interactions. Furthermore, the spatial distribution of the negative Laplacian with respect to all important bonds was determined around the central sulfur and nitrogen atoms. The analyses led to detailed information about the S,N interactions. A calculation of the reactive surfaces where the Laplacian equals zero revealed possible reaction pathways of nucleophilic attacks to the central sulfur atoms. All nitrogen atoms in H(NtBu)2SMe (III) as well as in CH2{S(NtBu)2(HNtBu)}2 (IV) are predominantly sp3 hybridised. The S,N bonds should therefore be formulated as S+–N– single bonds, strengthened and shortened by electrostatic reinforcement. In S(NtBu)2 (I) the sp2 hybridisation of the nitrogen atoms was verified. All topological criteria unearthed the inequality of the formally equivalent S=N double bonds. The differences were assigned to the molecular E/Z conformation in the solid state. Interaction between the in-plane lone-pair density of the nitrogen and the sulfur atom located at the same side causes the non-bonding charge concentration at the sulfur atom to be dislocated into the second S–N bond. The existence of a delocalised 3-centres-2-electrons system within the planar SN2 core was assumed to be formed by non-hybridised p-orbitals. An effective delocalisation was found to be possibly disturbed by a weak intermolecular S...S interaction. The interpretation of the S,N interaction in S(NtBu)3 (II) was not straightforward, since the electron density distribution showed both, indicators for multiple bonding as well as for sp3 hybridisation of the nitrogen atoms, which verifies the formulation of a S+–N– bonding mode. The bonding situation in S(NtBu)3 was identified as an intermediate state between that of a delocalised 4-centres-6-electrons system formed by non-hybridised p-orbitals within the planar SN3 unit and that of a S+–N– system.
In the various groups of social bees, different systems of communication about food sources occur. These communication systems are different solutions to a common problem of social insects: efficiently allocating the necessary number of workers first to the task of foraging and second to the most profitable food sources. The solution chosen by each species depends on the particular ecological circumstances as well as the evolutionary history of that species. For example, the outstanding difference between the bumble bee and the honey bee system is that honey bees can communicate the location of profitable food sources to nestmates, which bumble bees cannot. To identify possible selection pressures that could explain this difference, I have quantified the benefits of communicating location in honey bees. I show that these strongly depend on the habitat, and that communicating location might not benefit bees in temperate habitats. This could be due to the differing spatial distributions of resources in different habitats, in particular between temperate and tropical regions. These distributions may be the reason why the mostly temperate-living bumble bees have never evolved a communication system that allows them to transfer information on location of food sources, whereas most tropical social bees (all honey bees and many stingless bees) are able to recruit nestmates to specific points in their foraging range. Nevertheless, I show that in bumble bees the allocation of workers to foraging is also regulated by communication. Successful foragers distribute in the nest a pheromone which alerts other bees to the presence of food. This pheromone stems from a tergite gland, the function of which had not been identified previously. Usage of a pheromone in the nest to alert other individuals to forage has not been described in other social insects, and might constitute a new mode of communicating about food sources. The signal might be modulated depending on the quality of the food source. Bees in the nest sample the nectar that has been brought into the nest. Their decision whether to go out and forage depends not only on the pheromone signal, but also on the quality of the nectar they have sampled. In this way, foraging activity of a bumble bee colony is adjusted to foraging conditions, which means most bees are allocated to foraging only if high-quality food sources are available. In addition, foraging activity is adjusted to the amount of food already stored. In a colony with full honeypots, no new bees are allocated to foraging. These results help us understand how the allocation of workers to the task of food collection is regulated according to external and internal nest conditions in bumble bees.
Normoxic and anoxic metabolism of Nicotiana tabacum transformants lacking root nitrate reductase
(2002)
The aim of this work was to find out whether and how nitrate reduction in roots would facilitate survival of hypoxic and anoxic (flooding)-phases. For that purpose, we compared the response of roots of hydroponically grown tobacco wildtype (Nicotiana tabacum cv. Gatersleben) and of a transformant (LNR-H) with no nitrate reductase (NR) in the roots but almost normal NR in leaves (based on a nia2-double mutant). As an additional control we used occasionally a 35S-transformant of the same nia2-double mutant, which on the same genetic background constitutively expressed NR in all organs. In some cases, we also compared the response of roots from WT plants, which had been grown on tungstate for some time in order to completely suppress NR activity. The following root parameters were examined: 1) Growth and morphology 2) Root respiration rates and leaf transpiration 3) Metabolite contents in roots (ATP, hexosemonophosphates, free sugars, starch, amino acids, total protein) 4) Inorganic cation and anion contents 5) Lactate and ethanol production 6) Extractable LDH-and ADH-activities 7) Cytosolic pH values (by 31P-NMR) 8) NO Cation and anion contents of roots from WT and LNR-H were only slightly different, confirming that these plants would be better suited for our purposes than the widely used comparison of nitrate-versus ammonium-grown plants, which usually show up with dramatic differences in their ion contents. Normoxia: LNR-H-plants had shorter and thicker roots than WT with a lower roots surface area per leaf FW. This was probably the major cause for the significantly lower specific leaf transpiration of LNR-H. WT-roots had lower respiration rates, lower ATP-and HMP-contents, slightly lower sugar- and starch contents and somewhat lower amino acid contents than LNR-H roots. However, total protein/FW was almost identical. Obviously the LNR-H transformants did not suffer from N-defciency, and their energy status appeared even better than that of WT-roots. Data from the 35S-transformant were similar to those of WT. This indicates that the observed differences between WT and LNR-H were not due to unknown factors of the genetic nia2-background, but that they could be really traced back to the presence resp. absence of nitrate reduction. Anoxia: Under short-term anoxia (2h) LNR-H plants, but not WT-plants exhibited clear symptoms of wilting, although leaf transpiration was lower with LNR-H. Reasons are not known yet. LNR-H roots produced much more ethanol (which was excreted) and lactate compared to WT, but extractable ADH and LDH activities, were not induced by anoxia. However, the LDH activity background was twice as high as that of the WT troughout the time period studied. Tungstate-treated WT-roots also gave higher fermentation rates than normal WT roots. Sugar- and HMP-contents remained higher in LNR-H roots than in WT. NR in WT roots was activated under anoxia and roots accumulated nitrite, which was also released to the medium. 31P-NMR spectroscopy showed that LNR-H- roots, in spite of their better energy status, acidified their cytosol more than WT roots. Conclusions: Obviously nitrate reduction affects - by as yet unknown mechanisms - root growth and morphology. The much lower anoxic fermentation rates of WT-roots compared to LNR-H roots could not be traced back to an alternative NADH consumption by nitrate reduction, since NR activity was too low for that. An overall estimation of H+-production by glycolysis, fermentation and nitrate reduction (without nitrite reduction, which was absent under anoxia) indicated that the stronger cytosolic acidification of anoxic LNR-H roots was based on their higher fermentation rates. Thus, nitrate reduction under anoxia appears advantageous because of lower fermentation rates and concomitantly lower cytosolic acidification. However, it remained unclear why fermentation rates were so different. Perspective: Preliminary experiments had indicated that WT-roots produced more nitric oxide (NO) under anoxia than LNR-H-roots. Accordingly, we suggest that nitrate reduction, beyond a merely increased NADH-consumption, would lead to advantageous changes in metabolism, eventually via NO-production, which is increasingly recognized as an important signaling compound regulating many plant functions.
The classification of isoparametric hypersurfaces in spheres with a homogeneous focal manifold is a project that has been started by Linus Kramer. It extends results by E. Cartan and Hsiang and Lawson. Kramer does most part of this classification in his Habilitationsschrift. In particular he obtains a classification for the cases where the homogeneous focal manifold is at least 2-connected. Results of E. Cartan, Dorfmeister and Neher, and Takagi also solve parts of the classification problem. This thesis completes the classification. We classify all closed isoparametric hypersurfaces in spheres with g>2 distinct principal curvatures one of whose multiplicities is 2 such that the lower dimensional focal manifold is homogeneous. The methods are essentially the same as in Kramer's 'Habilitationsschrift'. The cohomology of the focal manifolds in question is known. This leads to two topological classification problems, which are also solved in this thesis. We classify simply connected homogeneous spaces of compact Lie groups with the same integral cohomology ring as a product of spheres S^2 x S^m and m odd on the one hand and a truncated polynomial ring Q[a]/(a^m) with one generator of even degree and m > 1 as its rational cohomology ring on the other hand.
Low-molecular mass natural products from bacteria, fungi, plants and marine organisms exhibit unique structural diversity which are of interest for the identification of new lead structures for medicinals and agrochemicals. In the search for bioactive compounds from marine sponges and sponge-associated fungi, this research work resulted to the isolation of twenty-six compounds, eight of which are new metabolites. The sponges were collected from the Indo-pacific regions, particularly those from Indonesian and Philippine waters, as well as those from the Mediterranean Sea near the island of Elba in Italy. A combination of the chemically- and biologically-driven approach for drug discovery was employed, wherein extracts were screened for antibacterial, antifungal and cytotoxic activities. In addition to the bioassay-guided approach to purify the compounds responsible for the activity of the extract, TLC, UV and MS were also used to isolate the chemically most interesting substances. Hence, purified compounds which are not responsible for the initial bioscreening activity may have a chance to be evaluated for other bioactivities. Enumerated below are the compounds which have been isolated and structurally elucidated and whose bioactivities have been further characterized. 1. The extract of the fungus Cladosporium herbarum associated with the sponge Callyspongia aerizusa afforded seven structurally related polyketides, including two new twelve-membered macrolides: pandangolide 3 and 4, and a new acetyl congener of the previously isolated 5-hydroxymethyl-2-furoic acid. The two furoic acid analogues isolated were found to be responsible for the antimicrobial activity of the extract. The isolation of the known phytotoxin Cladospolide B from Cladosporium herbarum, which was originally known from Cladosporium cladosporioides and C. tenuissimum, indicates the possibility that Cladospolide B may be a chemotaxonomic marker of particular Cladosporium species. 2. The extract of the fungus Curvularia lunata associated with the Indonesian sponge Niphates olemda yielded three compounds, namely the new antimicrobially-active anthraquinone lunatin, the known bisanthraquinone cytoskyrin A, and the known plant hormone abscisic acid. The co-occurrence of the two structurally-related anthraquinones suggests that the monomeric lunatin may be a precursor in the biosynthesis of the bisanthraquinone cytoskyrin A. 3. The fungus Penicillium spp. associated with the Mediterranean sponge Axinella verrucosa yielded six compounds, namely the known antifungal griseofulvin and its less active dechloro analogue; the known toxin oxaline; and the known cytotoxic metabolite communesin B and its two new congeners communesin C and D. The new communesins were less active than communesin B in the brine-shrimp lethality test. 4. An unidentified fungus which was also isolated from the same Mediterranean sponge Axinella verrucosa as Penicillium spp. yielded the known compound monocerin which has been reported to possess phytotoxic and insecticidal activities. 5. The fungus Aspergillus flavus associated with the Philippine sponge Hyrtios aff. reticulatus yielded the known toxin a-cyclopiazonic acid. 6. The Indonesian sponge Agelas nakamurai yielded four bromopyrrole alkaloids namely the new compound 4-bromo-pyrrole-2-carboxylic acid, and the known compounds: 4-bromo-pyrrole-2-carboxamide, mukanadin B and mukanadin C. All of the four compounds except mukanadin B were found to be antimicrobially-active. Bromopyrrole alkaloids are well-known metabolites of the genus Agelas and are proven to play an important role in the chemical defense of the sponge against predation from fishes. 7. The Indonesian sponge Jaspis splendens yielded three known substances which are known for their antiproliferative activities, namely the depsipeptides jaspamide (jasplakinolide), and its derivatives jaspamide B and jaspamide C.
In this thesis, I examined honey bee nectar foraging with emphasis on the communication system. To document how a honey bee colony adjusts its daily nectar foraging effort, I observed a random sample of individually marked workers during the entire day, and then estimated the number and activity of all nectar foragers in the colony. The total number of active nectar foragers in a colony changed frequently between days. Foraging activity did not usually change between days. A honey bee colony adjusts its daily foraging effort by changing the number of its nectar foragers rather than their activity. I tested whether volatiles produced by a foraging colony activated nectar foragers of a non-foraging colony by connecting with a glass tube two colonies. Each colony had access to a different green house. In 50% of all experiments, volatile substances from the foraging colony stimulated nectar foragers of the non-foraging colony to fly to an empty feeder. The results of this study show that honey bees can produce a chemical signal or cue that activates nectar foragers. However, more experiments are needed to establish the significance of the activating volatiles for the foraging communication system. The brief piping signal of nectar foragers inhibits forager recruitment by stopping waggle dances (Nieh 1993, Kirchner 1993). However, I observed that many piping signals (approximately 43%) were produced off the dance floor, a restricted area in the hive where most waggle dances are performed. If the inhibition of waggle dances would be the only function of the brief piping signal, tremble dancers should produce piping signals mainly on the dance floor, where the probability to encounter waggle dancers is highest. To therefore investigate the piping signal in more detail, I experimentally established the foraging context of the brief piping signal, characterized its acoustic properties, and documented for the first time the unique behavior of piping nectar foragers by observing foragers throughout their entire stay in the hive. Piping nectar foragers usually began to tremble dance immediately upon their return into the hive, spent more time in the hive, more time dancing, had longer unloading latencies, and were the only foragers that sometimes unloaded their nectar directly into cells instead of giving it to a nectar receiver bee. Most of the brief piping signals (approximately 99%) were produced by tremble dancers, yet not all tremble dancers (approximately 48%) piped. This suggests that piping and tremble dancing have related, but not identical functions in the foraging system. Thus, the brief piping signals may not only inhibit forager recruitment, but have an additional function both on and off the dance floor. In particular, the piping signal might function 1. to stop the recruitment of additional nectar foragers, and 2. as a modulatory signal to alter the response threshold of signal receivers to the tremble dance. The observation that piping tremble dancers often did not experience long unloading delays before they started to dance gave rise to a question. A forager’s unloading delay provides reliable information about the relative work capacities of nectar foragers and nectar receivers, because each returning forager unloads her nectar to a nectar receiver before she takes off for the next foraging trip. Queuing delays for either foragers or receivers lower foraging efficiency and can be eliminated by recruiting workers to the group in shortage. Short unloading delays indicate to the nectar forager a shortage of foragers and stimulate waggle dancing which recruits nectar foragers. Long unloading delays indicate a shortage of nectar receivers and stimulate tremble dancing which recruits nectar receivers (Seeley 1992, Seeley et al. 1996). Because the short unloading delays of piping tremble dancers indicated that tremble dancing can be elicited by other factors than long unloading delays, I tested whether a hive-external stimulus, the density of foragers at the food source, stimulated tremble dancing directly. The experiments show that tremble dancing can be caused directly by a high density of foragers at the food source and suggest that tremble dancing can be elicited by a decrease of foraging efficiency either inside (e.g. shortage of receiver bees) or outside (e.g. difficulty of loading nectar) the hive. Tremble dancing as a reaction to hive-external stimuli seems to occur under natural conditions and can thus be expected to have some adaptive significance. The results imply that if the hive-external factors that elicit tremble dancing do not indicate a shortage of nectar receiver bees in the hive, the function of the tremble dance may not be restricted to the recruitment of additional nectar receivers, but might be the inhibition or re-organization of nectar foraging.
OMB and ORG-1
(2002)
Members of the T-box gene family encode transcription factors that play key roles during embryonic development and organogenesis of invertebrates and vertebrates. The defining feature of T-box proteins is an about 200 aa large, conserved DNA binding motif, the T domain. Their importance for proper development is highlighted by the dramatic phenotypes of T-box mutant animals. My thesis was mainly focused on two Drosophila T-box genes, optomotor-blind (omb) and optomotor-blind related 1 (org-1), and included (i) a genetic analysis of org-1 and (ii) the identification of molecular determinants within OMB and ORG-1 that confer functional specificity. (i) Genetic analysis of org-1 initially based on a behavioral Drosophila mutant, C31. C31 is a X-linked, recessive mutant and was mapped to 7E-F, the cytological region of org-1. This pleiotropic mutant is manifested in walking defects, structural aberrations in the central brain, and "held-out" wings. Molecular analysis revealed that C31 contains an insertion of a 5' truncated I retrotransposon within the 3' untranslated transcript of org-1, suggesting that C31 might represent the first org-1 mutant. Based on this hypothesis, we screened 44.500 F1 female offspring of EMS mutagenized males and C31 females for the "held-out" phenotype, but failed to isolate any C31 or org-1 mutant, although this mutagenesis was functional per se. Since we could not exclude the possibility that our failure is due to an idiosyncracy of C31, we intended not to rely on C31 in further genetic experiments and followed a reverse genetic strategy . All P element lines cytologically mapping to 7E-7F were characterized for their precise insertion sites. 13 of the 19 analyzed lines had P element insertions within a hot-spot 37 kb downstream of org-1. No P element insertions within org-1 could be identified, but several P element insertions were determined on either side of org-1. The org-1 nearest insertions were used for local-hop experiments, in which we associated 6 new genes with P insertions, but failed to target org-1. The closest P elements are still 10 kb away from org-1. Subsequently, we employed org-1 flanking P elements to induce precise deletions in 7E-F spanning org-1. Two org-1 flanking P elements were brought together on a recombinant chromosome. Remobilization of P elements in cis configuration frequently results in deletions with the P element insertion sites as deficiency endpoints. In a first attempt, we expected to identify deficiencies by screening for C31 alleles. 8 new C31 alleles could be isolated. The new C31 chromosomes, however, did not carry the desired deletion. Molecular analysis indicated that C31 is not caused by aberrations in org-1, but by mutations in a distal locus. We repeated the P element remobilization and screened for the absence of P element markers. 4 lethal chromosomes could be isolated with a deletion of the org-1 locus. (ii) The consequences of ectopic org-1 were analyzed using UAS-org-1 transgenic flies and a number of different Gal4 driver lines. Misexpression of org-1 during imaginal development interfered with the normal development of many organs and resulted in flies with a plethora of phenotypes. These include a homeotic transformation of distal antenna (flagellum) into distal leg structures, a strong size reduction of the legs along their proximo-distal axis, and stunted wings. Like ectopic org-1, ectopic omb leads to dramatic changes of normal developmental pathways in Drosophila as well. dpp-Gal4/ UAS-omb flies are late pupal lethal and show an ectopic pair of wings and largely reduced eyes. GMR-Gal4 driven ectopic omb expression in the developing eye causes a degeneration of the photoreceptor cells, while GMR-Gal4/ UAS-org-1 flies have intact eyes. Hence, ectopic org-1 and omb induce profound phenotypes that are qualitatively different for these homologous genes. To begin to address the question where within OMB and ORG-1 the specificity determinants reside, we conceptionally subdivided both proteins into three domains and tested the relevance ofthese domains for functional specificity in vivo. The single domains were cloned and used as modules to assemble all possible omb-org-1 chimeric trans- genes. A method was developed to determine the relative expression strength of different UAS-transgenes, allowing to compare the various transgenic constructs for qualitative differences only, excluding different transgene quantities. Analysis of chimeric omb-org-1 transgenes with the GMR-Gal4 driver revealed that all three OMB domains contribute to functional specificity.
In the work here presented four distinctly different problems were investigated. The first problem was an investigation into the degradation of Dichloroethylene (DCE) and 1,1-bis (p-Chlorophenyl)-2-dichloroethylene (DDE) utilising pure bacterial cultures. The second investigation dealt with the degradation of DDE and polychlorinated Biphenyl’s (PCB’s) utilising anaerobic sediments and soils from New Zealand. The third investigation worked on the Granulation of anaerobic River-sediments in Upflow Anaerobic Sludge Blanket (UASB) Reactors. The last investigation describes the commissioning of an industrial aerobic Wastewater Treatment Plant and the Implementation of biological Nitrogen- and Phosphate removal in this Wastewater Treatment Plant. Since the chemical Structure of DCE and DDE have certain similarities, Bacteria that were capable of degrading DCE, were tested here, whether they would also be able to degrade DDE utilising a co-metabolic pathway. In the experiments the aerobic bacteria Methylosinus trichosporium and Mycobacterium vaccae and the anaerobic bacteria Acetobacterium woodii and Clostridium butyricum were used. Approximately 60% of the added DCE was degraded by M. vaccae, while M. trichosporium degraded approximately 50%. A. woodii and C. butyricum degraded 40% and 30% respectively of the added DCE. Further experiments with these cultures and DDE lead to a microbial degradation of DDE to an extent of 34.6% for M. vaccae, 14.1% for C. butyricum, 2.2% for A. woodii and 10.5% for M. trichosporium. Additional experiments, utilising [14C]-DDE, showed that the DDE had not been degraded but were attached to the bacterial cells. The second investigation utilised anaerobic soils and sediments from New Zealand to study the anaerobic co-metabolic degradation of DDE and PCB’s. The soils and sediments originated from the River Waikato, from Wastewater Ponds in Kinleith, Marine-Sediments from Mapua, and a variety of soils comtaminated with Pentachlorophenyl (PCP). The cultures from these soils and sediments were raised on a variety of Carbon- and Energy-sources. Beside DDE, Aroclor 1260, and a mix of four pure PCB-Congeneres (one Tetra-, one Hexa, one Hepta- and one Deca-Chlorobiphenyl) were used to test for the reductive dechlorination. The cultivation process of the baceria lasted six months. Samples of the cultures were taken after zero, three and six months. These samples were tested for the increase of cell-protein, the degradation of carbon- and energy-sources, and the removal of the added polychlorinated chemicals. The organochlorines were analysed using reversed phase HPLC and FID-GC. When a change in the Chromatogram was detected the respective cultures were further analysed using ECD-GC and GC-MS. The results showed that the culutres grew under these conditions, but no degradation of DDE and the PCB-Mix could be detected, and only small changes in the composition/chromatograms of Aroclor 1260 were found. The third investigation worked on the Granulation of River-Sediments in UASB-Reactors. Sediments from the River Waikato in New Zealand and the River Saale in Germany were used. In both cases the Granulation process was successful, which was demonstrated by microscopic comparisons of the Sediments and the resulting Granules. The two main bacterial cultures detected were Methanosarcina- and Methanothrix-like cultures. The main carbon- and energy-source was Lactic Acid, which was used at a concentration of 21,8 g COD/L. The Granulation-Process was a combination of using high a COD-Concentration combined with a low Volumetric Loading-Rate. Comparisons of the specific degradation-rates of a variety of carbon- and energy-sources between the Sediments and the Granules, showed no increased degradation rates in regard to the same cell-mass, but the increased bio-mass in the Granules allowed for higher degradation-rates within the UASB-reactors. The fourth investigation describes the commissioning of an industrial Wastewater Treatment Plant for a Dairy-Site in Edendale, Southland, New Zealand. This Plant consists of a DAF-Unit (Dissolved Air Flotation), two Extended Aeration Lagoons with Activated Sludge and two Clarifiers, one for the Activated Sludge and the second for the dosing of Aluminium-Sulphate and the removal of Phosphat-Sulphate. Biological processes for the removal of carbon- and energy-sources were optimised and biological processes for the reduction of Nitrogen- and Phosphate-Concentrations within the wastewater were implemented and optimised. Bilogical removal rates for COD of 95% and above, for Nitrogen of 85-92% and Phosphate of 64-83% were achieved.
Fanconi anemia (FA) is a genetically and phenotypically heterogenous autoso- mal recessive disease associated with chromosomal instability, progressive bone marrow failure, typical birth defects and predisposition to neoplasia. The clinical phenotype is similar in all known complementation groups (FA-A, FA-B, FA-C,FA-D1, FA-D2, FA-E, FA-F and FA-G). The cellular phenotype is characterized by hypersensitivity to DNA crosslinking agents (MMC,DEB), which is exploited as a diagnostic tool. Alltogether, the FA proteins constitute a multiprotein pathway whose precise biochemical function(s) remain unknown. FANCA, FANCC, FANCE, FANCF and FANCG interact in a nuclear complex upstream of FANCD2. Complementation group FA-D1 was recently shown to be due to biallelic mutations in the human breast cancer gene 2 (BRCA2). After DNA damage, the nuclear complex regulates monoubiquitylation of FANCD2, result- ing in targeting of this protein into nuclear foci together with BRCA1 and other DNA damage response proteins. The close connection resp. identity of the FA genes and known players of the DSB repair pathways (BRCA1, BRCA2, Rad51) firmly establishs an important role of the FA gene family in the maintenance of genome integrity. The chapter 1 provides a general introduction to the thesis describing the current knowledge and unsolved problems of Fanconi anemia. The following chapters represent papers submitted or published in scientific literature. They are succeeded by a short general discussion (chapter 7). Mutation analysis in the Fanconi anemia genes revealed gene specific mutation spectra as well as different distributions throughout the genes. These results are described in chapter 1 and chapter 2 with main attention to the first genes identified, namely FANCC, FANCA and FANCG. In chapter 2 we provide general background on mutation analysis and we report all mutations published for FANCA, FANCC and FANCG as well as our own unpublished mutations until the year 2000. In chapter 3 we report a shift of the mutation spectrum previously reported for FANCC after examining ten FA-patients belonging to complementation group C. Seven of those patients carried at least one previously unknown mutation, whereas the other three patients carried five alleles with the Dutch founder mu- tation 65delG and one allele with the Ashkenazi founder mutation IVS4+4A>T, albeit without any known Ashkenazi ancestry. We also describe the first large deletion in FANCC. The newly detected alterations include two missense mu- tations (L423P and T529P) in the 3´-area of the FANCC gene. Since the only previously described missense mutation L554P is also located in this area, a case can be made for the existence of functional domain(s) in that region of the gene. In chapter 4 we report the spectrum of mutations found in the FANCG gene com- piled by several laboratories working on FA. As with other FA genes, most muta- tions have been found only once, however, the truncating mutation, E105X, was identified as a German founder mutation after haplotype analysis. Direct compar- ison of the murine and the human protein sequences revealed two leucine zipper motifs. In one of these the only identified missense mutation was located at a conserved residue, suggesting the leucine zipper providing an essential protein-protein interaction required for FANCG function. With regard to genotype-phenotype correlations, two patients carrying a homozygous E105X mutation were seen to have an early onset of the hematological disorder, whereas the missense mutation seems to lead to a disease with later onset and milder clinical course. In chapter 5 we explore the phenomenon of revertant mosaicism which emerges quite frequently in peripheral blood cells of patients suffering from FA. We de- scribe the types of reversion found in five mosaic FA-patients belonging to com- plementation groups FA-A and FA-C. For our single FA-C-patient intragenic crossover could be proven as the mechanism of self-correction. In the remaining four patients (all of them being compound heterozygous in FANCA), either the paternal or maternal allele has reverted back to WT sequence. We also describe a first example of in vitro phenotypic reversion via the emergence of a compensat- ing missense mutation 15 amino acids downstream of the constitutional mutation explaining the MMC-resistance of the lymphoblastoid cell line of this patient. In chapter 6 we report two FA-A mosaic patients where it could be shown that the spontaneous reversion had taken place in a single hematopoietic stem cell. This has been done by separating blood cells from both patients and searching for the reverted mutation in their granulocytes, monocytes, T- and B-lymphocytes as well as in skin fibroblasts. In both patients, all hematopoietic lineages, but not the fibroblasts, carried the reversion, and comparison to their increase in erythrocyte and platelet counts over time demonstrated that reversion must have taken place in a single hematopoietic stem cell. This corrected stem cell then has been able to undergo self-renewal and also to create a corrected progeny, which over time repopulated all hematopoietic lineages. The pancytopenia of these patients has been cured due to the strong selective growth advantage of the corrected cells in vivo and the increased apoptosis of the mutant hematopoietic cells.
The high-grade metamorphic Epupa Complex (EC) of north-western Namibia constitutes the south-western margin of the Archean to Proterozoic Congo Craton. The north-eastern portion of the EC has been geochemically and petrologically investigated in order to reconstruct its tectono-metamorphic evolution. Two distinct metamorphic units have been recognized, which are separated by ductile shear zones: (1) Upper amphibolite facies rocks (Orue Unit) and (2) ultrahigh-temperature (UHT) granulite facies rocks (Epembe Unit). The rocks of the EC are transsected by a large anorthosite massif, the Kunene Intrusive Complex (KIC). The Orue Unit and the Epembe Unit were affected by two distinct Mesoproterozoic metamorphic events, as is evident from differences in their metamorphic grade, in the P-T paths and in the age of peak-metamorphism: (1) The Orue Unit consists of a Palaeoproterozoic volcano-sedimentary sequence, which was intruded by large masses of I-type granitoids and by rare mafic dykes. During the Mesoproterozoic (1390-1318 Ma) the Orue Unit rocks underwent upper amphibolite facies metamorphism. The volcano-sedimentary sequence is constituted by interlayered basaltic amphibolites and rhyolitic felsic gneisses, with intercalations of migmatitic metagreywackes, migmatitic metapelites, metaarkoses and calc-silicate rocks. The Orue Unit was subdivided into three parts, which record similar heating-cooling paths but represent individual crustal levels: Heating led to the partial replacement of amphibole, biotite and muscovite through dehydration melting reactions. The peak-metamorphic P-T conditions of c. 700°C, 6.5 +/- 1.0 kbar (south-eastern part), c. 820°C, 8 +/- 0.5 kbar (south-western part) and c. 800°C, 6.0 +/- 1.0 kbar (northern part) correlate well with the mineral assemblage in the metapelites, i.e. Grt-Bt-Sil gneisses and schist in the south-eastern and south-western region and (Grt-)Crd-Bt gneisses in the northern part. Peak-metamorphism was followed by retrograde cooling to middle amphibolite facies conditions. Contact metamorphism, related with the intrusion of the anorthosites, is restricted to the direct contact to the KIC and recorded by massive metapelitic Grt-Sil-Crd felses, formed under upper amphibolite facies conditions (c. 750°C, c. 6.5 kbar). (2) The Epembe Unit consists of a Palaeoproterozoic volcano-sedimentary succession, which was intruded by small bodies of S-type granitoids and by andesitic dykes. All these rocks underwent UHT granulite facies metamorphism during the early Mesoproterozoic (1520-1447 Ma). The volcano-sedimentary succession is dominated by interlayered basaltic two-pyroxene granulites and rhyolitic felsic granulites. Migmatitic metapelites and metagreywackes are intercalated in the metavolcanites. Sapphirine-bearing MgAl-rich gneisses occur as restitic schlieren in the migmatitic metagreywackes. Reconstructed anti-clockwise P-T paths are subdivided into several distinct stages: During prograde near-isobaric heating to UHT conditions at c. 7 kbar biotite- or hornblende-bearing mineral assemblages were almost completely replaced by anhydrous mineral assemblages through various dehydration melting reactions. A subsequent pressure increase of 2-3 kbar led to the formation of the peak-metamorphic mineral assemblages Grt-Opx and (Grt-)Opx-Cpx in the orthogneisses and Grt-Opx, Grt-Sil and (Grt-)(Spr-)Opx-Sil-Qtz in the paragneisses. UHT-Metamorphism is proved by conventional geothermobarometry (970 +/- 70°C; 9.5 +/- 2.5 kbar), by the very high Al content of peak-metamorphic orthopyroxene (up to 11.9 wt.% Al2O3) in many paragneisses and by Opx-Sil-Qtz assemblages in the MgAl-rich gneisses. Post-peak decompression is recorded by several corona and symplectite textures, formed at the expense of the peak-metamorphic phases: Initial UHT decompression of about ca. 2 kbar to 940 +/- 60°C at 8 +/- 2 kbar is mainly evident from the formation of sapphirine-bearing symplectites in the Opx-Sil gneisses. Subsequent high-temperature decompression to 6 +/- 2 kbar at 800 +/- 60°C resulted in the formation of Crd-Opx-Spl, Crd-Opx and Spl-Crd symplectites. Subsequent near-isobaric cooling to upper amphibolite conditions of 660 +/- 30°C at 5 +/- 1.5 kbar led to the re-growth of biotite, hornblende, sillimanite and garnet. During continued decompression orthopyroxene and cordierite were formed at the expense of biotite in several paragneisses. In a geodynamic model UHT metamorphism of the Epembe Unit is correlated with the formation of a large magma chamber at the mantle-crust boundary, which forms the source for the anorthosites of the KIC. In contrast, amphibolite facies metamorphism of the Orue Unit is ascribed to a regional contact metamorphic event, caused by the emplacement of the anorthositic crystal mushes in the middle crust.
Plants have evolved an elaborate system to cope with a variety of biotic and abiotic stresses. Typically, under stress conditions an appropriate defense response is invoked which is accompanied by changes in the metabolic status of the plant. Photosynthesis is downregulated and sucrose is imported into the tissue, which provides a faster and more constant flux of energy and carbon skeletons to perform the defense response. Interestingly, these processes are co-ordinately regulated and the signal transduction chains underlying these cellular programs appear to share at least some common elements. Both the induction of sink metabolism and defense response is dependent on signal transduction pathways involving protein phosphorylation. Furthermore, regulation of extracellular invertase (INV) and phenylalanine ammonia lyase (PAL) which are markers for sink metabolism and defense response is preceded by the transient activation of MAP kinases. In depth analysis of MAP kinase activation by partial purification led to the discovery that, depending on the stimulus, different subsets of MAP kinases are activated. This differential MAPK activation is likely to possess a signal encoding function. In addition, the partial purification of MAP kinases was found to be suitable to address specific cellular functions to individual MAP kinase isoenzymes. By this way, LpWIPK was identified as the major MAP kinase activity induced after stimulation of tomato cells with different elicitors. LpWIPK is thus considered as a key regulator of defense response together with sink induction in tomato. A study using nonmetabolisable sucrose analogs revealed that the regulation of photosynthesis is not directly coupled to this signal transduction pathway since it is independent of MAP kinase activation. Nonetheless, downregulation is induced by the same stimuli that induce the defense response and sink metabolism and it will therefore be interesting to uncover the branch points of this signalling network in the future. MAP kinases are not only central components regulating the response to biotic stresses. In addition to e.g. pathogens, MAP kinases are as well involved in signal transduction events invoked by abiotic stresses like cold and drought. In a recent study, we could show that a MAP kinase is activated by heat stress, under conditions a plant will encounter in nature. This previously unknown MAP kinase is able to specifically recognise the heat stress transcription factor HsfA3 as a substrate, which supports a role of this MAP kinase in the regulation of the heat stress response. Moreover, the observation that HsfA3 is phosphorylated by the heat activated MAP kinase in vitro provides a promising basis to identify HsfA3 as the first physiological substrate of a plant MAP kinase. Intracellular protons have been implicated in the signal transduction of defense related signals. In a study using Chenopodium rubrum cells, we could show that cytosolic changes in pH values do not precede the regulation of the marker genes INV and PAL. Depending on the stimulus applied, cytosolic acidification or alkalinisation can be observed, which excludes a role for protons as signals in this pathway. Together with the concomitant changes of the pH value of the extracellular space, these variations can thus be considered as terminal part of the defense response itself rather than as a second messenger. WRKY transcription factors have only recently been identified as indirect targets of a central plant MAP kinase cascade. In addition, the identification of cognate binding sites in the promoters of INV and PAL supports a role for these proteins in the co-ordinate regulation of defense response and sink induction. A novel elicitor responsive WRKY transcription factor, LpWRKY1, was cloned from tomato and characterised with respect to its posttranslational modification. This immediate early transcription factor is transiently induced upon pathogen attack and the induction is dependent on phosphorylation. Furthermore, it was shown for the first time with respect to WRKY transcription factors, that LpWRKY1 is phosphorylated in vivo. Analysis of the role of this phosphorylation by in gel assays using recombinant WRKY protein as the substrate revealed two protein kinases that are transiently activated during the defense response to phosphorylate LpWRKY1. This data demonstrates that WRKY proteins require phosphorylation to modulate their DNA binding or transactivating activity.
Zars and co-workers were able to localize an engram of aversive olfactory memory to the mushroom bodies of Drosophila (Zars et al., 2000). In this thesis, I followed up on this finding in two ways. Inspired by Zars et al. (2000), I first focused on the whether it would also be possible to localize memory extinction.While memory extinction is well established behaviorally, little is known about the underlying circuitry and molecular mechanisms. In extension to the findings by Zars et al (2000), I show that aversive olfactory memories remain localized to a subset of mushroom body Kenyon cells for up to 3 hours. Extinction localizes to the same set of Kenyon cells. This common localization suggests a model in which unreinforced presentations of a previously learned odorant intracellularly antagonizes the signaling cascades underlying memory formation. The second part also targets memory localization, but addresses appetitive memory. I show that memories for the same olfactory cue can be established through either sugar or electric shock reinforcement. Importantly, these memories localize to the same set of neurons within the mushroom body. Thus, the question becomes apparent how the same signal can be associated with different events. It is shown that two different monoamines are specificaly necessary for formation of either of these memories, dopamine in case of electric shock and octopamine in case of sugar memory, respectively. Taking the representation of the olfactory cue within the mushroom bodies into account, the data suggest that the two memory traces are located in the same Kenyon cells, but in separate subcellular domains, one modulated by dopamine, the other by octopamine. Taken together, this study takes two further steps in the search for the engram. (1) The result that in Drosophila olfactory learning several memories are organized within the same set of Kenyon cells is in contrast to the pessimism expressed by Lashley that is might not be possible to localize an engram. (2) Beyond localization, a possibible mechanism how several engrams about the same stimulus can be localized within the same neurons might be suggested by the models of subcellular organisation, as postulated in case of appetitive and aversive memory on the one hand and acquisition and extinction of aversive memory on the other hand.
The human retina is a multilayered neuroectodermal tissue specialized in the transformation of light energy into electric impulses which can be transmitted to the brain where they are perceived as vision. Since the retina is easily accessible and functional aspects are directly recordable, the study of this tissue has been at the forefront of neuroscience research for over a century. Studies have revealed that the distinct functions of the retina require a large degree of differentiation which is achieved by the coordinated function of approximately 55 different cell types. The highly structured anatomy and the functional differentiation of the retina is a result of its distinctive transcriptome and proteome. Due to the complexity of the retina it has been difficult to estimate the number of genes actively transcribed in this tissue. Great efforts in the elucidation of retinal disease genes have led to the identification of 139 retina disease loci with 90 of the corresponding genes cloned thus far . In contrast to the success in the hereditary disorders, efforts to identify the genetic factors conferring manifestations known as age-related macular degeneration (AMD) have revealed sparse results. AMD is a retinal disease affecting a significant percentage of the older population. This disorder is likely due to exogenic as well as genetic factors. To further our understanding of retinal physiology and facilitate the identification of genes underlying retinal degenerations, particularly AMD, our efforts concentrated on the systematic analysis of the retinal transcriptome. Since approximately half of all retinal degeneration-associated genes identified to date are preferentially expressed in retina, it is plausible that the investigation of gene expression profiles and the identification of retina-expressed transcripts could be an important starting point for characterizing candidate genes for the retinal diseases. The expressed sequence tags approach included the assessment of all retinal expressed sequence tags (EST) clusters indexed in the UniGene database and of 1080 single-pass ESTs derived from an in-house generated human retina suppression subtracted hybridization (SSH) cDNA library. In total, 6603 EST clusters were evaluated during this thesis and detailed in-silico analysis was performed on 750 EST clusters. The expression of the genes was evaluated using reverse transcriptase-polymerase chain reaction (RT-PCR), followed by confirmation using quantitative reverse transcriptase-polymerase chain reaction (qRT-PCR), as well as conventional and virtual Northern blot analysis. The expression profiling of 337 selected EST clusters led to the identification of 111 transcripts, of which 60 are specific or abundant to the retina, 3 are expressed at high levels in the retinal pigment epithelium (RPE), and 48 are expressed in brain as well as in retina. The EST approach used to select candidate transcripts allowed us to assess the effectiveness of the two available resources, the UniGene database and the retinal SSH (retSSH) cDNA library. From the results obtained, it is evident that the generation of suppression subtracted libraries to identify cell-specific transcripts constitutes the most straight-forward and efficient strategy. In addition to the high percentage of candidate genes that are identified from an SSH cDNA library, it has the added benefit that genes expressed at low levels can be identified. Furthermore, comparison of our retina-enriched gene set with previously published studies demonstrated only limited overlap of the identified genes further confirming the valuable source of retinal genes from our retinal SSH cDNA library. The effort of our and other groups has resulted in the establishment of the full-length coding sequence of 55 of the 111 genes uniquely or preferentially expressed in the retina. Using various methods such as bioinformatical analysis, EST assembly, cDNA library screening, and rapid amplification of cDNA ends (RACE) a number of genes were cloned in the scope of this thesis including C1orf32, C4orf11, C7orf9, C12orf7, C14orf29, DAPL1, and GRM7. Bioinformatic analyses and cDNA library screening were used to isolate the full-length cDNA sequence and determine the genomic organization of C7orf9, also identified as RFRP. This 1190 bp retina-specific transcript from chromosome 7p15.3 encodes a precursor protein for at least two small neuropeptides, referred to as RFRP-1 and RFRP-3. Since C7orf9 is localized in the critical region for dominant cystoid macular dystrophy (CYMD) its role in the pathology was investigated. Southern blot analysis and sequencing of samples from two affected individuals of the original pedigree used to localize the disease gene excluded the gene from involvement in this disease. Multiple isoforms of the C12orf7 gene were assembled from a number of clones identified from library screenings, PCR amplifications, and RACE experiments. The gene variants, transcribed from chromosome 12q13.13, have been found to be expressed exclusively in retina. Because of the multiple alternative splicing of the gene, we can only speculate about the nature of the protein it encodes. The longest transcript, which includes all six exons plus the last intervening sequence, encodes a 471 aa protein which contains a nuclear localization signal and five ankyrin repeats. The existence of many isoforms is also observed in mouse suggesting that they may have a relevant role in cellular physiology. Five novel splice variants of the glutamate metabotropic receptor 7 (GRM7) resulting from the use of alternative 3’-end exons were identified and characterized. One of the novel variants, GRM7_v3, encodes a 924 aa protein and is therefore the longest putative GRM7 protein reported to date. Even though they are not retina-specific, the isoforms are preferentially expressed in the nervous system. Although the functional properties of the specific carboxyl-termini are still unclear, it is known that axon targeting of GRM7_v1 is mediated by the last 60 aa of the protein. Hence the novel isoforms may direct the protein to specific subcellular localizations. The C1orf32 gene, preferentially expressed in retina, is organized in 10 exons and is transcribed from chromosome 1q24.1. Bioinformatic analyses of the 639 aa putative protein not only identified the mouse and rat orthologous genes but also the LISCH7 gene as a potential member of the same family. Since the LISCH7 protein has been shown to function as a low density lipoprotein receptor, the C1orf32 protein may be involved in retinal lipid homeostasis. Disturbances in lipid metabolism have been proposed as one of the pathways involved in AMD etiology. Thus, the role of C1orf32 in this complex disease should be investigated. Expression analyses of the death-associated protein-like 1 (DAPL1) gene revealed that it is expressed in both the retina and the RPE at high levels. The 552 bp transcript encodes a 107 aa putative protein and is transcribed from chromosome 2q24.1. In-silico analyses identified an additional 12 related proteins from various species which share high similarity constituting a novel protein family. The similarity to the death-associated-protein (DAP) is particularly interesting since this protein has been found to be indispensable for programmed cell death. Therefore, DAPL1 is an excellent candidate for retinal disease as apoptosis is generally the ultimate cause in retinal degeneration. The retina-specific C4orf11 and C14orf29 genes localized on chromosome 4q21.22 and 14q22.1, respectively, are both transcribed in more than one isoform. The encoded proteins do not contain any known domains but because of their retina-specific expression they may be important for proper retinal physiology. As part of the long-term goals of the project, several of the cloned genes are being genotyped to construct single nucleotide polymorphism (SNP) maps. Projects to investigate haplotype frequencies of candidate genes in large cohorts of controls and AMD patients are ongoing. Thus, by establishing a collection of 111 genes expressed exclusively or preferentially in the retina, the present work has laid the foundation for future research in retinal diseases.
Soluble guanylyl cyclase (sGC) is the best established receptor for nitric oxide (NO) and regulates a great number of important physiological functions. Surprisingly, despite the wellappreciated roles of this enzyme in regulation of vascular tone, smooth muscle cell proliferation, platelet aggregation, renal sodium secretion, synaptic plasticity, and other functions, extremely little is known about the regulation of sGC activity and protein levels. To date, the only well-proven physiologically relevant sGC regulator is NO. In the present study, some additional possibilities for sGC regulation were shown. Firstly, we evaluated the ability of different NO donors to stimulate sGC. Significant differences in the sGC stimulation by SNP and DEA/NO were found. DEA/NO stimulated sGC much stronger than did SNP. Interestingly, no correlation between the sGC protein and maximal activity distribution was found in rat brain regions tested, suggesting the existence of some additional regulatory mechanisms for sGC. The failure of SNP to stimulate sGC maximally might be one of the reasons why the lack of correlation between the distribution of sGC activity and proteins in brain was not detected earlier. Prolonged exposure of endothelial cells to NO donors produced desensitization of the cGMP response. This desensitization cannot be explained by increased PDE activity, since PDE inhibitors were not able to prevent the NO donor-induced decrease of the maximal cGMP response in endothelial cells. The failure of SH-reducing agents to improve the cGMP response after its desensitization by NO suggests that a SH-independent mechanism mediates NO effects. Demonstration that the potency of the recently described activator of oxidized (heme-free) sGC, BAY58-2667, to stimulate sGC increases after prolonged exposure of the cells to an NO donor, DETA/NO, suggests that oxidation of heme may be a reason for NOinduced desensitization of sGC and decrease in sGC protein level. Indeed, the well-known heme-oxidizing agent ODQ produces a dramatic decrease in sGC protein levels in endothelial cells and BAY58-2667 prevents this effect. Although the mechanism of sGC activation and stabilization by BAY58-2667 is unknown, this substance is an interesting candidate to modulate sGC under conditions where sGC heme iron is oxidized. Very little is known about regulation of sGC by intracellular localization or translocation between different intracellular compartments. In the present study, an increase in sGC sensitivity to NO under membrane association was demonstrated. Treatment of isolated lung with VEGF markedly increased sGC in membrane fractions of endothelial cells. Failure of VEGF to stimulate sGC membrane association in cultured endothelial cells allows us to propose a complex mechanism of regulation of sGC membrane association and/or a transient character of sGC membrane attachment. A very likely mechanism for the attachment of sGC to membranes is via sGCinteracting proteins. These proteins may participate also in other aspects of sGC regulation. The role of the recently described sGC interaction partner, Hsp90, was investigated. Shortterm treatment of endothelial cells with an Hsp90 inhibitor does not affect NO donor or calcium ionophore-stimulated cGMP accumulation in the cells. However, inhibition of Hsp90 results in a rapid and dramatic decrease in sGC protein levels in endothelial cells. These effects were unrelated to changes in sGC transcription, since inhibition of transcription had much slower effect on sGC protein levels. In contrast, inhibitors of proteasomes abolished the reduction in sGC protein levels produced by an Hsp90 inhibitor, suggesting involvement of proteolytic degradation of sGC proteins during inhibition of Hsp90. All these data together suggest that Hsp90 is required to maintain mature sGC proteins. In conclusion, in the present study it was demonstrated that multiple mechanisms are involved in the regulation of sGC activity and its sensitivity to NO. Oxidation of sGC heme by NO seems to be one of the mechanisms for negative regulation of sGC in the presence of high or prolonged stimulation with NO. Another possible means of regulating sGC sensitivity to NO is via the intracellular translocation of the enzyme. It has been also demonstrated here that attachment of sGC to the membrane fraction results in an apparent increase in the enzyme sensitivity to NO. Additionally, Hsp90 was required to maintain sGC protein in endothelial and other cell types. However, we could not find any acute affect of Hsp90 on sGC activity, as reported recently. All these findings demonstrate that the regulation of sGC activity and protein level is a much more complex process than had been assumed earlier.
Age related macular degeneration (AMD) is the leading cause of visual impairment in the elderly and the major cause of blindness in the developed world. To date, the molecular mechanisms underlying the disease are not well understood although in recent years a primary involvement of the retinal pigment epithelium (RPE) has become evident. The aim of the present study is to systematically analyse genes which are differentially expressed in the RPE, and to assess their possible association with mechanisms and pathways likely to be related to retinal disease, in particular AMD. Towards this goal, 2379 expressed sequence tags (ESTs) were established from an inhouse generated RPE cDNA library. This library was constructed by using the suppression subtraction hybridization (SSH) technique which normalises redundant sequences and ensures enrichment of rare transcripts. In a first phase, 1002 ESTs were sequenced and subjected to comprehensive alignment with public nucleotide and protein databases. A search of the 1002 ESTs against the human genome draft sequence yielded 168 known genes, 51 predicted genes, 15 unknown transcripts and 41 clones with no significant similarity. Reverse Northern blot hybridization was performed for 318 EST clusters to identify abundantly expressed genes in the RPE and to prioritize subsequent analyses. Representative clones were spotted onto a nylon membrane and hybridized with cDNA probes of driver (heart and liver) and tester (RPE) used in the cDNA library construction. Subsequently, 107 EST clusters were subjected to Northern blot hybridizations. These analyses identified 7 RPE-specific, 3 retina-specific, 7 RPE/retina-specific, and 7 tissue restricted transcripts, while 29 EST clusters were ubiquitously expressed, and evaluation was not possible for another 54 EST clusters. Of the 24 transcripts with specific or restricted expression, 16 clones were selected for further characterization. The predicted gene MGC2477 and 2 novel isoforms of the human transient receptor potential cation channel, subfamily M, member 3 (TRPM3) were cloned and further described in detail. In addition, polymorphic variations for these 2 genes as well as for the human MT-Protocadherin gene were determined. For MGC2477, 15 single nucleotide polymorphisms (SNPs) were identified, with 13 having a frequency of the minor allele greater than 20%. 10 of the 15 SNPs have not been reported in so far in public SNP repertoires. Partial assessment of the TRPM3 gene yielded 35 SNPs. Of these, 30 (85.7%) were highly frequent (0.17-0.5%), and 14 (40%) were novel. The MT-Protocadherin gene revealed 35 SNPs, including 28 (80%) with high frequency of the minor allele. 23 (65.7%) were novel SNPs. These SNPs will be used to construct the most common haplotypes. These will be used in case/control association studies in 400 AMD patients and 200 ethnically and aged matched controls to assess a possible contribution of these genes in the etiology of AMD.
During the Mesoproterozoic large volumes of magma were repeatedly emplaced within the basement of NW Namibia. Magmatic activity started with the intrusion of the anorthositic rocks of the Kunene Intrusive Complex (KIC) at 1,385-1,347 Ma. At its south-eastern margin the KIC was invaded by syenite dykes (1,380-1,340 Ma) and younger carbonatites (1,140-1,120 Ma) along ENE and SE trending faults. Older ferrocarbonatite intrusions, the ‘carbonatitic breccia’, frequently contain wallrock fragments, whereas subordinate ferrocarbonatite veins are almost xenolith-free. Metasomatic interaction between carbonatite-derived fluids and the neighbouring and incorporated anorthosites led to the formation of economically important sodalite deposits. Investigated anorthosite samples display the magmatic mineral assemblage of Pl (An37-75) ± Ol ± Opx ± Cpx + Ilm + Mag + Ap ± Zrn. Ilmenite and pyroxene are surrounded by narrow reaction rims of biotite and pargasite. During the subsolidus stage sporadic coronitic garnet-orthopyroxene-quartz assemblages were produced. Thermobarometry studies on amphiboles yield temperatures of 985-950°C whereas the chemical composition of coronitic garnet and orthopyroxene indicate a subsolidus re-equilibration of the KIC at conditions of 760 ± 100°C and 7.3 ± 1 kbar. In the syenites Kfs, Pl, Hbl and/or Cpx crystallized first, followed by a second generation of Kfs, Hbl, Fe-Ti oxides and Ttn. Crystallization of potassium feldspar occurred under temperatures of 890-790°C. For the crystallization of hastingsite pressures of 6.5 ± 0.6 kbar are obtained. In order to constrain the source rocks of the two suites, oxygen isotope analyses of feldspar as well as geochemical bulk rock analyses were carried out. In case of the anorthosites, the general geochemical characteristics are in excellent agreement with their derivation from fractionated basaltic liquids, with the d18O values (5.88 ± 0.19 ‰) proving their derivation from mantle-derived magmas. The results obtained for the felsic suite, provide evidence against consanguinity of the anorthosites and the syenites, i.e. (1) compositional gaps between the geochemical data of the two suites, (2) trace element data of the felsic suite points to a mixed crustal-mantle source, (3) syenites do not exhibit ubiquitous negative Eu-anomalies in their REE patterns, which would be expected from fractionation products of melts that previously formed plagioclase cumulates and (4) feldspar d18O values from the syenites fall in a range of 7.20-7.92 ‰, which, however, is about 1.6 ‰ higher than the average d18O of the anorthosites. Conformably, the crustal-derived felsic and the mantle-derived anorthositic suite are suggested to be coeval but not consanguineous. Their spatial and temporal association can be accounted for, if the heat necessary for crustal melting is provided by the upwelling and emplacement of mantle-derived melts, parental to the anorthosites. In order to constrain the source of the 1,140-1,120 Ma carbonatites and to elucidate the fenitizing processes, which led to the formation of the sodalite, detailed mineralogical and geochemical investigations, stable isotope (C,O,S) analyses and fluid inclusion measurements (microthermometrical studies and synchrotron-micro-XRF analyses) have been combined. There is striking evidence that carbonatites of both generations are magmatic in origin. They occur as dykes with cross-cutting relationships and margins disturbed by fenitic aureoles, and contain abundant flow-oriented xenoliths. The mineral assemblage of both carbonatite generations of Ank + Cal + Ilm + Mag + Bt ± Ap ± pyrochlore ± sulphides in the main carbonatite body and Ank + Cal + Mag ± pyrochlore ± rutile in the ferrocarbonatite veins, their geochemical characteristics and the O and C isotope values of ankerite (8.91 to 9.73 and –6.73 to –6.98, respectively) again indicate igneous derivation, with the 18O values suggesting minor subsolidus alteration. NaCl-rich fluids, released from the carbonatite melt mainly caused the fenitization of both, the incorporated and the bordering anorthosite. This process is characterized by the progressive transformation of Ca-rich plagioclase into albite and sodalite. Applying conventional geothermobarometry combined with fluid-inclusion isochore data, it was possible to reconstruct the P-T conditions for the carbonatite emplacement and crystallization (1200-630°C, 4-5 kbar) and for several mineral-forming processes during metasomatism (e.g. formation of sodalite: 800-530°C). The composition and evolutionary trends of the fenitizing solution were estimated from both the sequence of metasomatic reactions within wallrock xenoliths in the carbonatitic breccia and fluid inclusion data. The fenitizing solutions responsible for the transformation of albite into sodalite can be characterised as of NaCl-rich aqueous brines (19-30 wt.% NaCl eq.), that contained only minor amounts of Sr, Ba, Fe, Nb, and LREE.
In the last years it became evident that many cytokines do not only bind to their specific cell surface receptors but also interact with components of the extracellular matrix. Mainly in Drosophila, several enzymes were identified, that are involved in glycosaminoglycan synthesis. Mutations in these enzymes mostly result in disturbances of several signaling pathways like hedgehog, wingless, FGF or dpp. In most cases it was, due to these pleiotropic effects, not possible to examine the relevance of matrix interactions for single pathways. The aim of this work was to examine the relevance of matrix interactions for the TGF-ß superfamily member DPP. Based on the fact that DPP is highly homologous to human BMP-2, the basic N-terminus of mature DPP was mutated, which has been shown to contain a heparin-binding site in BMP-2. Thus, a wildtype variant (D-MYC), a deletion variant (D-DEL), which lacked the whole basic part of the N-terminus and a duplication variant (D-DUP), which contained a second copy of the basic core moitiv, were generated. In order to characterise the variants biochemically, they were expressed in E.coli and refolded in a bioactive form. In chicken limbbud assay, the deletion variant was much more active than the wildtype variant, comparable to data of BMP-2. By means of biacore mesurements with the immobilised ectodomain of the high affinity type I receptor thick veins, it could be demonstrated, that the variants differ only in matrix binding and not in their receptor affinity. Different matrix binding was shown by Heparin FPLC. The biological relevance of the matrix interaction of DPP was examined in transgenic flies. To allow expression of the different variants under the control of various Gal4 driver lines, they were cloned behind an UAS-promoter site. In early tracheal development, a strong dependence of DPP signaling on matrix binding was observed. While ectopic expression of the deletion variant caused only minor defects, the branching pattern was strongly disturbed by overexpression of wildtype and duplication variant. Ubiquitous expression of the variants in the wing imaginal disc caused overproliferation of the disc and expansion of the omb target gene expression. The extent of phenotypes correlated with the matrix binding ability of the variants. Corresponding disturbances of the wing vein pattern was observed in adult flies. By the crossing of different dpp allels, transheterozygous animals were created, that lack dpp only in imaginal discs. Expression of the variants under the control of a suitable dpp-Gal4 driver line revealed insights into the biological relevance of matrix binding on DPP gradient formation and specific target gene activation in wing imaginal discs. It was shown, that all variants were able to generate a functional DPP gradient with correct expression of the target genes omb and spalt. Again a correlation between extent of target gene domains and matrix binding ability of the corresponding variants was found. Thus by mutating the N-terminus of DPP, it could be shown that this is responsible for DPP`s matrix interaction. Also the relevance of matrix binding of DPP in different tissues was examined. It turned out, that the reorganisation of tracheal branching by DPP strongly depends on matrix interactions wheras the establishing of a gradient in wing imaginal discs depends only gradually on matrix interactions. Based on these data a model for the action of DPP/TGFßs as morphogens was established. While a deletion of matrix binding leads to a decrease in specific bioactivity of the cytokine, the latter is increased by additional matrix binding sites.
Synthesis of (RS)-5-amino-3-aryl (methyl)-pentanoic acid hydrochlorides, 3 aminomethyl-5-chloro-benzoic acid hydrochloride and (RS)-4-amino-3-(4`-ethynyl(iodo)-phenyl)-butanoic acid hydrochlorides have been accomplished. The aim of their synthesis was to evaluate their GABABR agonist activity and to derive a model which will correlate their structure with the observed pEC50. The GABABR agonist activity of the prepared compounds has been determined in functional assay based on calcium measurement in vitro using tsA cells transfected with GABAB1b/GABAB2/Gαq-z5. Reviews on the neurotransmitter receptors (ligand-gated ion channel receptors and G protein-coupled receptors), their agonists and antagonists have been given in the general part of this work. A detailed discussion on the strategy followed for the synthesis of the designed compounds as well as the starting materials and intermediates has been described and illustrated in Schemes 2-6. The synthesized compounds were evaluated for their GABABR agonist activity. Furthermore, these compounds were docked in the available 3D homology model of GABABR using the program FlexiDock implemented in SYBYL software. Subsequently, we derived a predictive model which correlates the experimentally determined pEC50 with the calculated binding energy of certain baclofen analogues and homologues. In addition, we used the program DISCO (DIStance COmparisons) implemented in SYBYL software to find the pharmacophore features of GABAB agonists.
The main aim of this work was the classification of highly polar E–N (E = Al, Si, P) and Li–E’ (E’ = C, N, O) bonds in terms of ionic (closed-shell) or covalent (shared) interactions. To answer this question the experimentally determined electron density was analyzed using Bader’s theory of ‘Atoms in Molecules’ (AIM). This allows a quantitative evaluation of properties derived from the electron density, such as the Laplacian, the ellipticitiy and the ratio of the highest charge concentration perpendicular to the bond path, to the largest charge depletion along the bonding vector. Most of these properties were monitored along the entire bonding region and not limited to the BCP as in former studies. The analyses are completed by the calculation of the electronic energy densities Hl at the BCPs and the integration of atomic basins also defined within the AIM theory. The electrostatic potential (ESP) was computed from the multipole parameters to reveal preferred reactive sites of the structures under investigation. Apart from that, the multipole formalism was applied to problematic crystal structures in order to open this method for twinned samples or those including disordered groups in the molecule.
The first part of this work focuses on the characterization of systems which complex electronic structures require the application of multi-reference methods. The anti-tumor efficacy of the natural product Neocarzinostatin is based on the formation of diradicals and causes DNA cleavage and finally cytolysis. Computations on model systems performed in the present work show the influence of structural features on the mode of action and the efficacy of this antitumor-antibiotic. The cyclization of systems related to the enyne-cumulene framework like the enyne-allenes was investigated earlier and relations to the more unusual class of enyne-ketenes are analyzed. The class of enyne-ketenes (and also the enyne-allenes) show a broad spectrum of possible intermediates (diradicals, zwitterions, allenes). The electronic structures of these intermediates are also possible for the (heteroatom substituted) 1,2,4-cyclohexatriene and a model for their energetic sequence based on high-level multi-reference computations is proposed. In all three projects the application of multi-reference approaches is necessary to obtain a comprehensive picture of the reactivity and electronic structure but also shows up the limits inherently existing in the currently available programs with respect to the size of the molecules. In the second part, algorithms for a multi-reference Moller-Plesset perturbation theory (MR-MP2) program, designed to perform large-scale computations, were developed and implemented. The MR-MP2 approach represents the most cost-effective multireference ansatz and requires an efficient evaluation of the Hamilton matrix for which an algorithm is designed to instantly recognize only non-vanishing matrix elements and to employ the recurring interaction patterns of the Hamilton matrix. The direct construction of the Hamilton matrix is additionally parallelized to work on cluster environments.
This work is investigating the electronic structure of organic thin films. A central question in this respect is the influence of the interaction between the molecules in the condensed phase and the interaction at metal-organic interfaces on the electronic properties. For this purpose the experimental methods Photoelectron Spectroscopy (PES) and Near Edge X-ray Absorption Finestructure Spectroscopy (NEXAFS) were applied with highest energy resolution. In addition, ab initio calculations were performed for the theoretical simulation of NEXFAS spectra. The investigation is mainly focussing on thin, vacuum sublimated films of aromatic model molecules with oxygen-containing functional groups (NTCDA, PTCDA, NDCA, BPDCA and ANQ) and Ag(111) surfaces. Due to their large, delocalised p-systems these molecules have very interesting properties for their application in electronic devices. Due to the high energy resolution of third generation synchrotron sources the vibronic fine structure in the NEXAFS spectra of these large molecules could be resolved for the first time in the condensed phase. A comparison of the data of the different molecules provides interesting insight into the coupling between electronic transition and vibronic excitation. Although for these molecules a variety of different vibronic modes exist, the NEXAFS data show that preferentially only on mode couples to each electronic transition. The high-resolution PES spectra of the molecules NTCDA, PTCDA, NDCA, BPDCA and ANQ show distinct differences thus providing a fingerprint for each investigated substance. A comparative analysis of the spectra enabled us to define the 1s binding energies of all chemically different carbon and oxygen atoms. Additional structures in the spectra can be assigned as shake-up satellites. The five molecules are an ideal model system for the investigation of fundamental aspects of core electron spectroscopy, such as initial and final state effects and satellites, that are influenced by the intra- and intermolecular electron distribution in the ground and core ionized state. An important aspect in this thesis is the spectroscopic investigation of structurally different NTCDA monolayer phases on the Ag(111) surface. Marked differences in the electronic structures of the different phases, that can be assigned to differences in the metal-adsorbate interaction, could be demonstrated by XPS and NEXAFS. The substrate bonding can be characterized as chemisorptive for both, the compressed as well as the relaxed NTCDA monolayer, which can be unambiguously deduced from the analysis of satellite structures in the O 1s and C 1s XPS spectra. These satellites are due to dynamic screening by charge transfer from the substrate. The NEXAFS data show consistently, that the NTCDA LUMO becomes partly occupied upon adsorption. Highly interesting phase transitions into disordered low-temperature phases occur upon cooling to 160 K for both, the compressed and the relaxed NTCDA monolayer. Thereby, the adsorbate-substrate bonding is increased and the NTCDA LUMO becomes completely occupied. This can be observed in the NEXAFS data, where transitions involving LUMO final states are quenched. Simultaneously, the XPS data show a distinctly decreased intensity of unscreened photoemission states due to enhanced charge transfer screening. In addition, a hysteresis behaviour could be demonstrated for the phase transition of the relaxed monolayer by temperature dependent NEXAFS experiments and the hysteresis curve was determined. The hysteresis could be quantified to approx. 20 K. From SPA-LEED experiments the activating energy for the phase transition of the relaxed monolayer upon cooling could be determined to 60 meV. Finally, a NEXAFS investigation of polyethylene samples with different comonomer content is presented. Differences in the absorption spectra between samples with different comonomer content could be unambiguously assigned to the different crystallinities of the samples by heating a highly crystalline sample in situ close to the melting temperature. Ab initio calculations on a model matrix of butane molecules show, that the spectra of crystalline and amorphous polyethylene differ distinctly due to the intermolecular interaction, which can be observed best for resonances with strong Rydberg character. Thus, the differences in the PE spectra can be explained by the superposition of the signatures of crystalline and amorphous moieties, that are mixed according to the respective crystallinity.