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- oxytocin (2)
- p-Halbleiter (2)
- p34 (2)
- p44 (2)
- p90 ribosomal S6 kinase (2)
- pCa (2)
- pH (2)
- pICln (2)
- paediatrics (2)
- pain regulation (2)
- pain sensation (2)
- paleogeography (2)
- palladium (2)
- palliative care (2)
- pandemic (2)
- panel sequencing (2)
- parabiosis (2)
- parallel evolution (2)
- parallel imaging (2)
- parasite biology (2)
- parasitic cell cycles (2)
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- paraspeckles (2)
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- parathyroid hormone (2)
- parietal hypoactivation (2)
- parkinson's disease (2)
- parotid gland (2)
- parthenogenesis (2)
- partial agonists (2)
- partial decay width (2)
- particles (2)
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- pastoral care (2)
- pathogen (2)
- pathogenic bacteria (2)
- pathway analysis (2)
- patient education (2)
- patient reported outcome measures (2)
- patient safety (2)
- patient survival (2)
- patient-reported outcomes (2)
- patient-specific (2)
- pattern (2)
- peak oxygen uptake (2)
- pedagogical content knowledge (2)
- pediatric adrenocortical cancer (2)
- pediatric adrenocortical tumor (2)
- pediatric patients (2)
- peer review (2)
- pelvic examination (2)
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- pembrolizumab (2)
- pemphigus foliaceus (2)
- penicillin allergy (2)
- penicillin hypersensitivity (2)
- pentacoordinate (2)
- people (2)
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- peptide tyrosine tyrosine (PYY) (2)
- peptide vaccination (2)
- peptides (2)
- performance modeling (2)
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- pericytes (2)
- periodization (2)
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- peripheral nerve (2)
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- periprosthetic joint infection (2)
- peritoneal carcinomatosis (2)
- peroxisomes (2)
- personalised medicine (2)
- personality traits (2)
- personalized treatment (2)
- perspective taking (2)
- perspectives (2)
- perylene bisimides (2)
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- phage (2)
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- pharmacodynamics (2)
- pharmacokinetic (2)
- pharmacology/toxicology (2)
- pharmacovigilance (2)
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- phenprocoumon (2)
- phosphatidylserine (2)
- phosphodiesterase (2)
- phosphoglycolate phosphatase (2)
- phospholipase D (2)
- phosphorus (2)
- photoemission spectroscopy (2)
- photoinduzierter Elektronentransfer (2)
- photolysis (2)
- photon statistics (2)
- photon-counting (2)
- photoreceptor (2)
- photoreceptors (2)
- photoswitchable organic fluorophores (2)
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- physiologically based pharmacokinetic (PBPK) modeling (2)
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- phytochemistry (2)
- phytohormones (2)
- pi-conjugation (2)
- piRNA (2)
- pig (2)
- pigmentation (2)
- piperacillin/tazobactam (2)
- piperidines (2)
- placebo-controlled trial (2)
- planning (2)
- plant (2)
- plant cuticle (2)
- plant defence (2)
- plant defenses (2)
- plant diversity (2)
- plant immunity (2)
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- plaque (2)
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- plasminogen (2)
- platelet physiology (2)
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- plausibility (2)
- pleomorphic adenoma (2)
- pneumolysin (2)
- pneumonia (2)
- point of care testing (2)
- pointing gestures (2)
- polarimetry (2)
- polaritons (2)
- polarized epithelium (2)
- policy (2)
- politics of representation (2)
- pollen analysis (2)
- pollen metabarcoding (2)
- pollen tube (2)
- pollination network (2)
- pollinator decline (2)
- pollinator friendly plants (2)
- pollinators (2)
- poly(2- oxazoline) (2)
- polycationic peptides (2)
- polymavirus (2)
- polymer-peptide-conjugate (2)
- polymorphisms (2)
- polymyalgia rheumatica (2)
- polyploidy (2)
- pomalidomide (2)
- population codes (2)
- population-based (2)
- populations (2)
- pore formation (2)
- pose estimation (2)
- positive selection (2)
- positron emission tomography/computed tomography (2)
- post-transcriptional regulation (2)
- posterior parietal cortex (2)
- postmenopausal women (2)
- postnatal development (2)
- postoperative bleeding (2)
- postoperative care (2)
- postoperative nausea and vomiting (2)
- posttranslational modifications (2)
- postural control (2)
- potassium channel (2)
- power training (2)
- pp Collisions (2)
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- pre-messenger RNA (2)
- precision agriculture (2)
- preconditioning (2)
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- predictive factors (2)
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- predictive markers (2)
- predictive modeling (2)
- predictive performance (2)
- predictive value (2)
- preexisting bias (2)
- prenatal exposure (2)
- prenatal stress (2)
- preschool (2)
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- preterm infant (2)
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- priming (2)
- printability (2)
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- projection neurons (2)
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- puberty (2)
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- qPCR (2)
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- ssVEP (2)
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Inhibition of Nuclear Import of Calcineurin Prevents the Development of Myocardial Hypertrophy
(2007)
The Calcineurin/NFAT signaling cascade is a crucial transducer of cellular function. It has recently been emerged that in addition to the transcription factor NFAT, the phosphatase Calcineurin is also translocated to the nucleus. Our traditional understanding of Calcineurin activation via sustained high Ca2+-levels was also advanced by recent findings from this working group (AG Ritter), which showed that Calcineurin is activated by proteolysis of the C-terminal autoinhibitory domain. This leads to the constitutive activation and nuclear translocation of Calcineurin. Therefore, Calcineurin is not only responsible for dephosphorylating of NFAT in the cytosol thus enabling its nuclear import, its presence in the nucleus is also significant in ensuring the full transcriptional activity of NFAT. Formation of complexes between transcription factors and DNA regulates the transcriptional process. Therefore, the time that transcription factors remain nuclear is a major determinant of transcriptional activity. The movement of proteins over ~40 kDa into and out of the nucleus is governed by the nuclear pore complex (NPC). Transcription factors and enzymes that regulate the activity of these proteins are shuttled across the nuclear envelope by proteins that recognize nuclear localization signals (NLS) and nuclear export signals (NES) within the amino acid sequence of these transcription factors. In this study, the precise mechanisms of Calcineurin nuclear import and export were identified. Additionally to the nuclear localization sequence (NLS) and the nuclear export sequence (NES) within the sequence of Calcineurin, the respective nuclear cargo proteins, responsible for nuclear import, Importinβ1, and for nuclear export, CRM1, were identified. Inhibition of the Calcineurin/importin interaction by a competitive peptide, called Import Blocking Peptide (IBP), which mimicked the Calcineurin NLS, prevented nuclear entry of Calcineurin. A non-inhibitory control peptide showed no effect. Using this approach, it was able to prevent the development of myocardial hypertrophy. In Angiotensin II stimulated cardiomyocytes, both the transcriptional and the translational level was suppressed. Additionally, cell size and expression of Brain natriuretic peptide (as molecular marker for hypertrophy) were significantly reduced compared untreated controls. IBP worked dose-dependent, but did not affect the Calcineurin phosphatase activity. In conclusion, Calcineurin is not only capable of dephosphorylating NFAT, thus enabling its nuclear import, its presence in the nucleus is also important for full NFAT transcriptional activity. Using IBP to prevent the nuclear import of Calcineurin is a completely new approach to prevent the development of myocardial hypertrophy.
Neural networks can synchronize by learning from each other. For that purpose they receive common inputs and exchange their outputs. Adjusting discrete weights according to a suitable learning rule then leads to full synchronization in a finite number of steps. It is also possible to train additional neural networks by using the inputs and outputs generated during this process as examples. Several algorithms for both tasks are presented and analyzed. In the case of Tree Parity Machines the dynamics of both processes is driven by attractive and repulsive stochastic forces. Thus it can be described well by models based on random walks, which represent either the weights themselves or order parameters of their distribution. However, synchronization is much faster than learning. This effect is caused by different frequencies of attractive and repulsive steps, as only neural networks interacting with each other are able to skip unsuitable inputs. Scaling laws for the number of steps needed for full synchronization and successful learning are derived using analytical models. They indicate that the difference between both processes can be controlled by changing the synaptic depth. In the case of bidirectional interaction the synchronization time increases proportional to the square of this parameter, but it grows exponentially, if information is transmitted in one direction only. Because of this effect neural synchronization can be used to construct a cryptographic key-exchange protocol. Here the partners benefit from mutual interaction, so that a passive attacker is usually unable to learn the generated key in time. The success probabilities of different attack methods are determined by numerical simulations and scaling laws are derived from the data. If the synaptic depth is increased, the complexity of a successful attack grows exponentially, but there is only a polynomial increase of the effort needed to generate a key. Therefore the partners can reach any desired level of security by choosing suitable parameters. In addition, the entropy of the weight distribution is used to determine the effective number of keys, which are generated in different runs of the key-exchange protocol using the same sequence of input vectors. If the common random inputs are replaced with queries, synchronization is possible, too. However, the partners have more control over the difficulty of the key exchange and the attacks. Therefore they can improve the security without increasing the average synchronization time.
Ferromagnetic semiconductors (FS) promise the integration of magnetic memory functionalities and semiconductor information processing into the same material system. The prototypical FS (Ga,Mn)As has become the focus of semiconductor spintronics research over the past years. The spin-orbit mediated coupling of magnetic and semiconductor properties in this material gives rise to many novel transport-related phenomena which can be harnessed for device applications. In this thesis we address challenges faced in the development of an all-semiconductor memory architecture. A starting point for information storage in FS is the knowledge of their detailed magnetic anisotropy. The first part of this thesis concentrates on the investigation of the magnetization behaviour in compressively strained (Ga,Mn)As by electrical means. The angle between current and magnetization is monitored in magnetoresistance(MR) measurements along many in-plane directions using the Anisotropic MR(AMR) or Planar Hall effect(PHE). It is shown, that a full angular set of such measurements displayed in a color coded resistance polar plot can be used to identify and quantitatively determine the symmetry components of the magnetic anisotropy of (Ga,Mn)As at 4 K. We compile such "anisotropy fingerprints" for many (Ga,Mn)As layers from Wuerzburg and other laboratories and find the presence of three symmetry terms in all layers. The biaxial anisotropy term with easy axes along the [100] and [010] crystal direction dominates the magnetic behaviour. An additional uniaxial term with an anisotropy constant of ~10% of the biaxial one has its easy axis along either of the two <110> directions. A second contribution of uniaxial symmetry with easy axis along one of the biaxial easy axes has a strength of only ~1% of the biaxial anisotropy and is therefore barely visible in standard SQUID measurements. An all-electrical writing scheme would be desirable for commercialization. We report on a current assisted magnetization manipulation experiment in a lateral (Ga,Mn)As nanodevice at 4 K (far below Tc). Reading out the large resistance signal from DW that are confined in nanoconstrictions, we demonstrate the current assisted magnetization switching of a small central island through a hole mediated spin transfer from the adjacent leads. One possible non-perturbative read-out scheme for FS memory devices could be the recently discovered Tunneling Anisotropic MagnetoResistance (TAMR) effect. Here we clarify the origin of the large amplification of the TAMR amplitude in a device with an epitaxial GaAs tunnel barrier at low temperatures. We prove with the help of density of states spectroscopy that a thin (Ga,Mn)As injector layer undergoes a metal insulator transition upon a change of the magnetization direction in the layer plane. The two states can be distinguished by their typical power law behaviour in the measured conductance vs voltage tunneling spectra. While all hereto demonstrated (Ga,Mn)As devices inherited their anisotropic magnetic properties from their parent FS layer, more sophisticated FS architectures will require locally defined FS elements of different magnetic anisotropy on the same wafer. We show that shape anisotropy is not applicable in FS because of their low volume magnetization. We present a method to lithographically engineer the magnetic anisotropy of (Ga,Mn)As by submicron patterning. Anisotropic strain relaxation in submicron bar structures (nanobars) and the related deformation of the crystal lattice introduce a new uniaxial anisotropy term in the energy equation. We demonstrate by both SQUID and transport investigations that this lithographically induced uniaxial anisotropy overwrites the intrinsic biaxial anisotropy at all temperatures up to Tc. The final section of the thesis combines all the above into a novel device scheme. We use anisotropy engineering to fabricate two orthogonal, magnetically uniaxial, nanobars which are electrically connected through a constriction. We find that the constriction resistance depends on the relative orientation of the nanobar magnetizations, which can be written by an in-plane magnetic field. This effect can be explained with the AMR effect in connection with the field line patterns in the respective states. The device offers a novel non-volatile information storage scheme and a corresponding non-perturbative read-out method. The read out signal is shown to increase drastically in samples with partly depleted constriction region. This could be shown to originate in a magnetization direction driven metal insulator transition of the material in the constriction region.
Abiotic environmental stress, as evoked by short-term exposure of greenhousegrown plants to ambient ultraviolet radiation (UV), induces chemical and morphological adaptations of plants. Responses depend on the strength of stress and differ between species and tissues of variable age. In two Brassicaceae, Sinapis alba and Nasturtium officinale, stress responses towards short-term exposure to ambient radiation including or excluding UV reveal a high phenotypic plasticity, with strong differences their chemical composition compared to plants that remained in the greenhouse. The most pronounced defensive response against UV, the accumulation of flavonoid pigments, was strongest in young UV-exposed leaves, with an increase of the more effectice flavonol quercetin on the expense of less effectice kaempferol. Glucosinolates and myrosinase enzymes showed highly species-specific responses to UV-stress. Feeding behaviour and larval performance of the oligophagous Brassicaceae specialist, Phaedon cochleariae (Chrysomelidae; Coleoptera) were poorly affected by these differently UV-exposed host plants. Effects of plant stress on larval development were restricted to a minor variation in body mass due to variable food conversion of certain larval instars, which were compensated until pupation. Moreover, larval developmental times were unaffected by UV-exposure, but varied between species and leaves of different age. For P. cochleariae, this lack of variation in larval and pupal development towards UV-altered phytochemistry may suggest a strong genetic fixation of life history traits. In combination, the high plasticity towards variable food quality may correspond to the beetles’s specialisation on a narrow range of chemically highly variable host plants. Apart from being involved in plant defence against generalist herbivores, glucosinolates may also act as recognition cues and feeding stimulants for specialist insects. In earlier studies, glucosinolates were assumed to stimulate feeding by P. cochleariae, and they were suggested to be present on outermost leaf surfaces. However, since these findings were based on crude extraction methods, the presence of feeding stimulants in epicuticular waxes of Brassicaceae was re-investigated. In our study, glucosinolates were not detectable in mechanically removed waxes in Brassica napus and N. officinale, whereas substrate concentrations in solvent leaf extracts corresponded to densities and closure of leaf surface stomata. Therefore, glucosinolates that originate from the mesophyll may have been washed out through open stomata. Neither leaf waxes, nor leaf waxes combined with sinigrin or pure sinigrin evoked feeding. Moreover, in choice tests, these leaf beetles clearly preferred to feed on de-waxed surfaces. Finally, the presence of feeding stimulants in epicuticular waxes is highly unlikely considering the physico-chemical properties of the plant cuticle. The lack of stimulants on the outermost surface corresponds to the plant’s perspective, which should avoid easily accessible feeding stimulants. Nevertheless, the role of glucosinolates for feeding stimulation of P. cochleariae remained unclear. Therefore, S. alba leaf extracts of different polarities were tested in bioassays in order to identify which chemical leaf compounds act as stimulants. In bioassay-guided fractionations of methanol extracts by semi-preparative HPLC, two distinct fractions with stimulating activity were detected, whereas other fractions were not effective. Flavonoids were identified as main component in one stimulating fractions, the second fraction mainly contained glucosinolates, including sinalbin. The combination of both fractions was significantly more stimulating than each individual fraction, indicating additive effects of at least one compound of each fraction. However, since the combined fractions were less effective compared to the original extracts, other compounds may additionally be involved in the complex composition of leaf compounds acting as feeding stimulants for P. cochleariae. Finally, fractionated extracts of UV altered plants were used to test whether the strength of feeding responses depend on different ratios of glucosinolates and flavonoids. However, since the feeding behavior of this leaf beetle was not affected, such quantitative variations were concluded to be less important. The initiation of feeding behaviour may solely depend on the presence of stimulating compounds.
The basic question which drove our whole work was to find a meaningful noncommutative gauge theory even for the time-like case ($\theta^{0 i} \neq 0$). In order to be able to tackle questions regarding unitarity, it is not sufficient to consider theories which include the noncommutative parameter only up to a finite order. The reason is that in order to investigate tree-level unitarity or the optical theorem in loops one has to know the behavior of the noncommutative theory for center-of-mass energies much greater than the noncommutative scale. Therefore an effective theory, that is by construction only valid up to the noncommutative scale, isn't sufficient for our purpose. Our model is based on two fundamental assumptions. The first assumption is given by the commutation relations \eqref{eq:ncalg}. This led to the Moyal-Weyl star-product \eqref{eq:astproduct2} which replaces all point-like products between two fields. The second assumption is to assume that the model built this way is not only invariant under the noncommutative gauge transformation but also under the commutative one. In order to obtain an action of such a model one has to replace the fields by their appropriate \swms. We chose the gauge fixed action \eqref{eq:actioncgf} as the fundamental action of our model. After having constructed the action of the NCQED including the {\swms} we were confronted with the problem of calculating the {\swms} to all orders in $\tMN$. By means of \cite{bbg} we could calculate the {\swms} order by order in the gauge field, where each order in the gauge field contains all orders in the noncommutative parameter (\cf chapter \ref{chapter:swms}). By comparing the maps with the result we obtained from an alternative ansatz \cite{bcpvz}, we realized that already the simplest {\swm} for the gauge field is not unique. In chapter \ref{chapter:ambiguities} we examined this ambiguity, which we could parametrised by an arbitrary function $\astf$. The next step was to derive the Feynman rules for our NCQED. One finds that the propagators remain unchanged so that the free theory is equal to the commutative QED. The fermion-fermion-photon vertex contains not only a phase factor coming from the Moyal-Weyl star-product but also two additional terms which have their origin in the \swms. Beside the 3-photon vertex which is already present in NCQED without {\swms} and which has also additional terms coming from the \swms, too, one has a contact vertex which couples two fermions with two photons. After having derived all the vertices we calculated the pair annihilation scattering process $e^+ e^- \rightarrow \gamma \gamma$ at Born level. By choosing the parameter $\kggg = 1$ (\cf section \ref{sec:represent}), we found that the amplitude of the pair annihilation process becomes equal to the amplitude of the NCQED without \swms. This means that, at least for this process, the NCQED excluding {\swms} is only a special case of NCQED including \swms. On the basis of the pair annihilation process, we afterwards investigated tree-level unitarity. In order to satisfy the tree-level unitarity we had to constrain the arbitrary function $\astf$. We found that the series expansion of $\astf$ has to start with unity. In addition, the even part of the function must not increase faster than $s^{-1/2} \log(s)$ for $s \rightarrow \infty$, whereas the odd part of the $\astf$-function can't be constrained, at least by the process we considered. By assuming these constrains for the $\astf$-function, we could show that tree-level unitarity is satisfied if one incorporates the uncertainties present in the energy and the momenta of the scattered particles, \ie the uncertainties of the center-of-mass energy and the scattering angles. This uncertainties are not exclusively present due to the finite experimental resolution. A delta-like center-of-mass energy as well as delta-like momenta are in general not possible because the scattered particles are never exact plane waves.
Performance Evaluation of Efficient Resource Management Concepts for Next Generation IP Networks
(2007)
Next generation networks (NGNs) must integrate the services of current circuit-switched telephone networks and packet-switched data networks. This convergence towards a unified communication infrastructure necessitates from the high capital expenditures (CAPEX) and operational expenditures (OPEX) due to the coexistence of separate networks for voice and data. In the end, NGNs must offer the same services as these legacy networks and, therefore, they must provide a low-cost packet-switched solution with real-time transport capabilities for telephony and multimedia applications. In addition, NGNs must be fault-tolerant to guarantee user satisfaction and to support business-critical processes also in case of network failures. A key technology for the operation of NGNs is the Internet Protocol (IP) which evolved to a common and well accepted standard for networking in the Internet during the last 25 years. There are two basically different approaches to achieve QoS in IP networks. With capacity overprovisioning (CO), an IP network is equipped with sufficient bandwidth such that network congestion becomes very unlikely and QoS is maintained most of the time. The second option to achieve QoS in IP networks is admission control (AC). AC represents a network-inherent intelligence that admits real-time traffic flows to a single link or an entire network only if enough resources are available such that the requirements on packet loss and delay can be met. Otherwise, the request of a new flow is blocked. This work focuses on resource management and control mechanisms for NGNs, in particular on AC and associated bandwidth allocation methods. The first contribution consists of a new link-oriented AC method called experience-based admission control (EBAC) which is a hybrid approach dealing with the problems inherent to conventional AC mechanisms like parameter-based or measurement-based AC (PBAC/MBAC). PBAC provides good QoS but suffers from poor resource utilization and, vice versa, MBAC uses resources efficiently but is susceptible to QoS violations. Hence, EBAC aims at increasing the resource efficiency while maintaining the QoS which increases the revenues of ISPs and postpones their CAPEX for infrastructure upgrades. To show the advantages of EBAC, we first review today’s AC approaches and then develop the concept of EBAC. EBAC is a simple mechanism that safely overbooks the capacity of a single link to increase its resource utilization. We evaluate the performance of EBAC by its simulation under various traffic conditions. The second contribution concerns dynamic resource allocation in transport networks which implement a specific network admission control (NAC) architecture. In general, the performance of different NAC systems may be evaluated by conventional methods such as call blocking analysis which has often been applied in the context of multi-service asynchronous transfer mode (ATM) networks. However, to yield more practical results than abstract blocking probabilities, we propose a new method to compare different AC approaches by their respective bandwidth requirements. To present our new method for comparing different AC systems, we first give an overview of network resource management (NRM) in general. Then we present the concept of adaptive bandwidth allocation (ABA) in capacity tunnels and illustrate the analytical performance evaluation framework to compare different AC systems by their capacity requirements. Different network characteristics influence the performance of ABA. Therefore, the impact of various traffic demand models and tunnel implementations, and the influence of resilience requirements is investigated. In conclusion, the resources in NGNs must be exclusively dedicated to admitted traffic to guarantee QoS. For that purpose, robust and efficient concepts for NRM are required to control the requested bandwidth with regard to the available transmission capacity. Sophisticated AC will be a key function for NRM in NGNs and, therefore, efficient resource management concepts like experience-based admission control and adaptive bandwidth allocation for admission-controlled capacity tunnels, as presented in this work are appealing for NGN solutions.
In spite of David Lodge’s rejection of the theories labelled as poststructuralist, this thesis proves that his novels can be interpreted from a Foucauldian perspective. The concept of discourse, seen by the French philosopher as intricately linked with knowledge, power and truth, enables the distinction of four main discourses in Lodge’s novels, religious, gender, ethnic and literary. The analysis reveals that in David Lodge’s fiction there is a perpetual struggle for power illustrating Foucault’s idea of the interdependence between power, knowledge, truth and discourses circulated by institutions.
In 2001 the 433 m deep Messel 2001 borehole was drilled in the centre of the Messel Pit, 25 km south of Frankfurt (Germany). Geoscientific results from this drilling clarified the origin of the circular-shaped basin as a maar-diatreme-structure. Recovered deposits consist of lacustrine sediments (0-240 m) and volcaniclastic rocks such as lapilli tuffs (240-373 m) as well as rocks of the underlying diatreme breccia (373 433 m). The lapilli tuffs, as main interest here, show little differentiation on a macro- and microscopic scale and appear as a massive and unsorted volcaniclastic body with dominating juvenile lapilli and accidental clasts mostly in the range of (sub)millimetres to centimetres in diameter. This study presents rock magnetic properties measured on core samples of the volcaniclastic units and explains the origin of downhole magnetic anomalies detected during the drilling project in 2001. Magnetic behaviour of the erupted material is related to fine-grained, Fe-rich (titano)-magnetites, which are dispersed within the juvenile lapilli. Temperature-dependent susceptibility experiments, isothermal remanent magnetisation and hysteresis investigations demonstrate similar ferrimagnetic properties throughout the volcaniclastic material, in terms of composition, coercivity and grain size (pseudo-single-domain particles) of the ferrimagnetic minerals. Thus, during emplacement of the erupted material, the ferrimagnetic minerals had the same remanence acquisition potential. However, demagnetisation experiments show different magnetic stability behaviour of the acquired natural remanent magnetisation (NRM). Heating experiments prove the acquisition of thermal remanent magnetisation (TRM) dominated by temperature effects which could have been occurred during eruption and deposition of volcanic material, forming the Messel maar-diatreme. It is assumed that the upper half of the lapilli tuffs was deposited at relatively low depositional temperatures (<300 °C), whereas the material of the lower half took advantage of higher temperatures (>>300 °C). To understand the rock magnetic character within the Messel maar-diatreme-facies, particle grain sizes, the degree of the relative fraction dominance and the shape of the juvenile fragments have been studied in more detail. Image analytical methods as well as major and trace element analyses on the juvenile fraction support the clear subdivision of the lapilli tuffs. These findings in combination with rockmagnetic data indicate a separation into a relatively hot, geochemically undifferentiated eruption phase and a colder, differentiated phase. A two-condition eruption stage at the end of the Messel volcanic activity is suggested. The juvenile particles account for the temperature evolution and heat conditions during deposition of the Messel tuffs and contribute to the origin of magnetic field anomalies. Based on gravity parameters and the results of magnetisation properties, the potential field 3D-model of the Messel subsurface explains the negative ground anomalies, calculates the mass and volume parameters of the drilled lithozones and shows the asymmetric appearance of the diatreme-structure.
NO has been described as an important component involved in the development of the hypersensitive reaction (Delledonne et.al., 1998). Furthermore, NO induces expression of a set of defence gene, such as PR-1, PAL1 and chalcone synthase (CHS), and accumulation of SA (Durner et al., 1998). In this study, transgenic plants with altered NO levels were used to study the role of NO in plant defence. Arabidopsis plants which, due to expression of a bacterial NO dioxygenase, exhibit lower levels of NO than wild-type plants, show several weakened defence response, including the oxidative burst and expression of phenylpropanoid pathway genes. By contrast, constitutive expression of a bacterial NO synthase in Arabisopsis results in increased levels of endogenous NO. However, these plants do not show constitutively activated defence responses, but suffer from increased susceptibility to various strains of P. syringae. This might indicate that a gradient in NO production rather than constitutive elevation of NO is necessary to trigger plant defence responses. Nevertheless, NO seems to be important for regulation of the oxidative state in plant cells. This function of NO is important during leaf senescence. The data of the present work indicate that NO acts as senescence-delaying factor during plant development. The molecular action of NO in plants and signalling cascades in which NO is involved as second messenger are still poorly understood. Experiments addressing the selective quantification of NO in intact plant tissue, the identification of NO-target proteins as well as the function of NO-modified biomolecules might help to understand the role of NO in plants. Non-host resistance consists of several layers of defence that include preformed compounds existing in plants before pathogen infection and induced defences which the plant activates after recognition of a pathogen. The role of inducible defences in preventing multiplication of non-adapted bacteria is not clear. Our experiments suggest that to restrict non-adapted bacterial growth, pre-formed antimicrobial compounds and an early inducible cell wall-based defence might play an important role in Arabidopsis leaves. Upon inoculation with non-adapted bacteria, we have observed early, TTSS-independent up-regulation of PAL1 and BCB, two lignin biosynthesis genes which might be involved in papilla formation or other kinds of cell wall fortification. Moreover, Arabidopsis pal1 knockout lines permit significantly higher survival of non-adapted bacteria in leaves than wild-type plants, suggesting a functional importance of PAL1 up-regulation. Although non-host bacteria, like host bacteria, induce accumulation of SA and PR gene expression in a TTSS-dependent manner, SA-dependent or JA/ET-dependent defences do not directly contribute to non-host resistance. Moreover, non-adapted bacteria activate similar defence signalling pathways as do host bacteria. However, because of varieties in effector protein composition between different non-adapted bacterial strains, the activated signalling pathways might also include different compounds. The Arabidopsis ecotype Ler 0 is more susceptible to a non-adapted strain of P. syringae than ecotype Col-0. Although differences in glucosinolate content and composition between those ecotypes exist, they are probably not a major reason for the observed difference in non-host resistance. To further understand the mechanisms underlying non-host resistance, the generation of double or triple mutants with deficits in both cell wall-based defences and SA-dependent signal cascades is necessary. Moreover, the study of genome polymorphism and composition of secondary metabolites between Ler-0 and Col-0 can shed new light into the mechanisms of non-host resistance against bacterial pathogens. Additionally, experiments addressing papilla formation and callose biosynthesis in Ler-0 and Col-0 could help to further elucidate bacterial non-host resistance. Our data indicate that localized contact of Arabidopsis leaves with non-adapted bacteria, type III secretion-defective P. syringae strains and bacterial pathogen-associated molecular patterns (PAMPs) induce systemic acquired resistance (SAR) at the whole plant level. This finding contrasts the general belief that an HR or other leaf necroses are required for SAR induction. The observed symptomless systemic response was abolished in all SAR-deficient mutants tested in this study, but was intact in the jar1 mutant, which is compromised in induction of ISR, indicating that non-host bacteria and PAMPs induce SAR in a mechanistically similar way than host bacteria. In addition, our data show that the extent of SA accumulation or PR gene expression induced at sites of virulent or avirulent P. syringae inoculation rather than the amount of tissue necroses or jasmonate accumulation determine the magnitude of SAR. The fact that systemic responses were also triggered after local treatment with type III secretion-defective P. syringae strains and bacterial PAMPs indicate that induction of SAR is TTSS-independent. Instead, recognition of general elicitors like flagellin and LPS play an important role in activation of the SAR process. To broaden the concept of PAMP-based SAR initiation, further general elicitors from bacteria and fungal pathogens should be tested for their capability to induce SAR. Screens for mutants with deficiency in SAR activation by individual PAMPs can help to identify new components involved in the SAR signalling cascade. Possible functions of PAMPs as mobile systemic signals should be tested in future experiments. By selection of candidate genes whose expression is up-regulated in Arabidopsis leaves infected with avirulent and virulent P. syringae and pathophysiological analyses of corresponding T-DNA knockout lines, FLAVIN-DEPENDENT MONOOXYGENASE1 (FMO1) was identified as a key SAR regulator. SAR triggered by P. syringae is completely abolished in fmo1 mutant plants, and pathogen-induced expression of FMO1 in systemic leaves is closely correlated with the capability of different Arabidopsis lines to develop SAR. According to our findings, we have proposed that the FMO1 acts in signal amplification in non-inoculated, systemic leaves to trigger SAR. Experimental verification of the postulated potential amplification cycle underlying SAR should be tested in future experiments. The generation of transgenic lines expressing FMO1::GFP will provide useful information about the cellular localization of the FMO1 protein. Moreover, a comparative metabolomic analysis using SAR-induced wild-type, fmo1 knockout and FMO1 overexpressing lines can be used to identify substrates and reaction products of the FMO1 monooxygenase. As the single yeast FMO (yFMO) provides oxidizing equivalents at the ER for correct protein folding, expression of FMO1 in yfmo mutant yeast combined with protein activity assays might indicate whether FMO1 exhibits functional similarities with yeast FMO, e.g. in assuring proper folding of ER-targeted proteins essential for SAR establishment. Identification of further genes involved in activation of systemic resistance and biochemical characterization of the corresponding proteins can help to understand the SAR process in more detail.
Helicobacter pylori (H. pylori) is a gram-negative, microaerophilic, spiral-shaped bacterium. It resides in the gastric mucous layer and epithelial lining of the stomach, often clustering at the junction of epithelial cells. H. pylori colonization usually occurs during childhood, and, when left untreated, generally persists for the host’s lifetime. Persistent H. pylori infection can cause chronic superficial gastritis and gastric duodenal ulcers, which is possibly linked to the development of gastric carcinoma and primary gastric lymphoma, especially of the mucosa-associated lymphoid tissue (MALT) type. It was recently defined as a class 1 carcinogen. The gastric inflammatory response to H. pylori infection is characterized by infiltration of the mucosa by neutrophils, T and B cells, plasma cells and macrophages. This reaction is initially induced by H. pylori attachment, followed by cytokine release by gastric epithelial cells. Epidemiological studies revealed that more than 50% of adults are infected with H. pylori all over the world. However, interestingly, only a subset of individuals develops serious H. pylori-related disease, while most infected individuals show no clinical symptoms. Gastric epithelial cells, like intestinal epithelial cells, express a subset of Toll-like receptors (TLRs) and similar pattern recognition receptors, which are important for the activation of the innate immune system. Bacterial components such as lipopeptides, peptidoglycan, LPS, flagellin, and CpG DNA are the ligands of TLRs. Thus, TLRs in gastric epithelial cells might be able to contribute to innate immune responses to H. pylori infection. However, there is scant knowledge about the mechanisms of innate immune response to acute and chronic H. pylori infection. This study is focused on host cell interaction with H. pylori flagellins, which are major components of the flagellar apparatus, and innate immune responses against them. The flagellins, which are essential for bacterial motility, are important for H. pylori to survive in the stomach mucus during the whole infectious cycle. Flagellins are known to act as the main determinant of many mucosal pathogenic bacteria that mediates proinflammatory signaling, including transcriptional factor NF-B activation via TLR5. In the first part of the study, we investigated the effects of H. pylori flagellins on TLR5 expression, NF-B activation and IL-8 production in various human intestinal and gastric epithelial cell lines by using Western blotting, semi-quantitative RT-PCR and ELISA. IL-8 is a potent neutrophil-activating chemokine expressed by gastric epithelial cells. When we stimulated the cells with the native form of or E. coli-expressed recombinant H. pylori flagellins, FlaA and FlaB, IL-8 was not induced in any case, while S. typhimurium flagellin (FliC) induced it significantly. H. pylori was able to modulate TLR5 protein expression and NF-B activation in epithelial cells regardless of the presence of flagellins. Having established the finding that H. pylori flagellins have unusually low immune-stimulatory properties, we further investigated to find out possible reasons why H. pylori flagellins are distinct from other flagellins of pathogenic bacteria in terms of immune-stimulatory activity. From amino acid sequence comparisons, we found that some regions in the terminal D0D1 protein domains of H. pylori flagellins are different from flagellins of other pathogenic bacteria. D0D1 is the domain which is known to interact with TLR5 in Salmonella FliC. To examine whether the differences endow H. pylori flagellins with low immune-stimulatory properties, we created several mutated H. pylori flagellins (FlaA and FlaB) by site-directed mutagenesis that contain one to four epitopes of Salmonella flagellin D0D1 domain amino acid sequences. The mutant flagellins expressed both in H. pylori and E. coli were used to determine their influence on TLR5-signaling mediators and cytokines, such as MAPkinases, (ERK, p38), NF-B, IL-8, and MIP-3. Salmonella FliC expressed in E. coli induced activation of p38, IB and NF-B leading to IL-8 and MIP-3 production in gastric epithelial cells. However, none of the H. pylori flagellin mutants activated MAP kinases or induced those cytokines. In a co-immunoprecipitation assay none of the recombinant wild type or mutated H. pylori flagellins showed any direct physical interaction with TLR5, while Salmonella FliC significantly co-precipitated with TLR5. Interestingly, we found H. pylori flagellins bind to the surface of gastric epithelial cells like FliC, although they do not bind to or stimulate TLR5. Based on the physical interaction of H. pylori flagellins and FliC with human gastric epithelial cells, we further analyzed transcriptional regulation by H. pylori flagellin in these host cells using microarray analysis. The result showed that H. pylori flagellins modulate host cell gene expression, and many of the identified regulation events overlap with the genes regulated by FliC. These findings imply that H. pylori flagellins do play a role in gene regulation of host cells probably through still unknown factors or receptors, although they do not trigger TLR5-related signaling pathways. The results of our study suggest that, in addition to the low immune-stimulatory activity of H. pylori LPS, the evolutionary reduction in stimulating activity of H. pylori flagellins on the local innate immune responses in the stomach in vivo might be a further strategy of this chronic mucosal pathogen to evade and minimize deleterious host responses, thereby promoting life-long persistence in the host, and possibly contributing to cancerogenesis.
This thesis deals with the isolation and structural elucidation of bioactive naphthylisoquinoline alkaloids and related analogs. The mode of action of the antiplasmodial activity exhibited by the naphthylisoquinoline alkaloids was explored and compared to that of the antimalarial drug chloroquine. Furthermore, the phase 1 and 2 metabolism of dioncophyllines A and C and dioncopeltine A were investigated. In detail the following results have been obtained: • From the leaves of the recently discovered East African liana A. tanzaniensis six naphthylisoquinoline alkaloids were isolated. • The leaves of a botanical yet undescribed Ancistrocladus species, collected by Prof. Dr. V. Mudogo in the Democratic Republic of Congo in the habitat Yeteto near the town Ikela, were analyzed for naphthylisoquinoline alkaloids for the first time. The isolation work led to the first identification of an N,C-coupled naphthyldihydroisoquinoline alkaloid; ancistrocladinium B. Phytochemical investigation of the roots of the Congolese Ancistrocladus species (habitat Yeteto), , afforded five new derivatives of known naphthylisoquinoline alkaloids, namely 5'-O-demethylhamatine, 5'-O-demethylhamatinine, 6-O-demethylancistroealaine A, 6,5'-O,O-didemethylancistroealaine A, and 5-epi-6-O-methylancistrobertsonine A, along with six known naphthylisoquinoline alkaloids. • The antiplasmodial activity guided purification of 60Co irradiated samples containing commercially available naphthylisoquinoline related substances, afforded the isolation of the irradiation products 3,4-dihydro-1-isoquinolinone, 3,4-dihydro-1-isoquinolineamine, and 1,2,3,4-tetrahydro-1,2-diazirino-isoquinoline. The compounds were found to be more active than the starting material, although only exhibiting weak antiplasmodial activity against P. falciparum. • The effect on the absorption spectrum of FPIX due to complex formation with the naphthylisoquinoline alkaloids dioncophyllines A and C, dioncopeltine A korupensamine A, and ancistrocladine was examined by a titration study. Job's plot analyses by UV-spectroscopy determined the stoichiometry for the complex formation of FPIX and naphthylisoquinoline alkaloids to be 2:1. Furthermore, the dissociation constants for the complexation with FPIX were determined for each of the naphthylisoquinoline alkaloids investigated. Dioncophylline C and dioncopeltine A were found to possess dissociation constants, which are comparable to the one reported for the antimalarial drug chloroquine. The ability of ESI to transfer noncovalent solution-phase assemblies intact into the gas phase, was conducted on solution mixtures of naphthylisoquinoline alkaloid and FPIX, as well as on mixtures of chloroquine and FPIX. The mass spectrometry analyses revealed several peaks, which corresponded to the complex formation of FPIX to the respective ligands investigated. The most interesting results obtained were the detection of peaks corresponding to the complex formation between a chelated dimer of FPIX and dioncophylline Cand of peaks corresponding to a double protonated tetramer of FPIX – consisting of two chelated -oxo dimers of FPIX – in complex formation with two molecules of chloroquine. • Two phase 1 metabolism products of dioncophylline A were identified. Coelution in combination with HPLC-MS/MS, NMR, and CD investigations assigned the major metabolic product as 5'-O-demethyldioncophylline A. The minor metabolic product was only present in small amounts, which disabled an unambiguous structural characterization of the compound. However, as deduced from the mass spectrometry analyses and exclusion of a possible metabolic oxidation product by coelution with authentic reference material, the metabolite should possess a 4-hydroxylated isoquinoline portion and is assumed to be represented by structure. Dioncophylline C and dioncopeltine A were found to be stable to phase 1 metabolism reactions caused by rat liver microsomes.
Since the fruit fly Drosophila melanogaster entered the laboratories as a model organism, new genetic, physiological, molecular and behavioral techniques for the functional analysis of the brain rapidly accumulated. Nowadays this concerted assault obtains its main thrust form Gal4 expression patterns that can be visualized and provide the means for manipulating -in unrestrained animals- groups of neurons of the brain. To take advantage of these patterns one needs to know their anatomy. This thesis describes the Virtual Insect Brain (VIB) protocol, a software package for the quantitative assessment, comparison, and presentation of neuroanatomical data. It is based on the 3D-reconstruction and visualization software Amira (Mercury Inc.). Its main part is a standardization procedure which aligns individual 3D images (series of virtual sections obtained by confocal microscopy) to a common coordinate system and computes average intensities for each voxel (volume pixel). The VIB protocol facilitates direct comparison of gene expression patterns and describes their interindividual variability. It provides volumetry of brain regions and helps to characterize the phenotypes of brain structure mutants. Using the VIB protocol does not require any programming skills since all operations are carried out at a (near to) self-explanatory graphical user interface. Although the VIB protocol has been developed for the standardization of Drosophila neuroanatomy, the program structure can be used for the standardization of other 3D structures as well. Standardizing brains and gene expression patterns is a new approach to biological shape and its variability. Using the VIB protocol consequently may help to integrate knowledge on the correlation of form and function of the insect brain. The VIB protocol provides a first set of tools supporting this endeavor in Drosophila. The software is freely available at http://www.neurofly.de.
This thesis extends the classical theoretical work of Macevicz and Oster (1976, expanded by Oster and Wilson, 1978) on adaptive life history strategies in social insects. It focuses on the evolution of dynamic behavioural patterns (reproduction and activity) as a consequence of optimal allocation of energy and time resources. Mathematical modelling is based on detailed empirical observations in the model species Lasioglossum malachurum (Halictidae; Hymenoptera). The main topics are field observations, optimisation models for eusocial life histories, temporal variation in life history decisions, and annual colony cycles of eusocial insects.
The insulin receptor ortholog EmIR of the fox-tapeworm Echinococcus multilocularis displays significant structural homology to the human insulin receptor (HIR) and has been suggested to be involved in insulin sensing mechanisms of the parasite’s metacestode larval stage. In the present work, the effects of host insulin on Echinococcus metacestode vesicles and the proposed interaction between EmIR and mammalian insulin have been studied using biochemical and cell-biological approaches. Human insulin, exogenously added to in vitro cultivated parasite larvae, (i) significantly stimulated parasite survival and growth, (ii) induced DNA de novo synthesis in Echinococcus, (iii) affected overall protein phosphorylation in the parasite, and (iv) specifically induced the phosphorylation of the parasite’s Erk-like MAP kinase orthologue EmMPK1. These results clearly indicated that Echinococcus metacestode vesicles are able to sense exogenous host insulin which induces a mitogenic response. To investigate whether EmIR mediates these effects, anti-EmIR antibodies were produced and utilized in biochemical assays and immunohistochemical analyses. EmIR was shown to be expressed in the germinal layer of the parasite both on the surface of glycogen storing cells and undifferentiated germinal cells. Upon addition of exogenous insulin to metacestode vesicles, the phosphorylation of EmIR was significantly induced, an effect which was suppressed in the presence of specific inhibitors of insulin receptor-like tyrosine kinases. Furthermore, upon expression of EmIR/HIR receptor chimera containing the extracellular ligand binding domain of EmIR in HEK 293 cells, a specific autophosphorylation of the chimera could be induced through the addition of exogenous insulin. These results indicated the capability of EmIR to sense and to transmit host insulin signals to the Echinococcus signaling machinery. The importance of insulin signaling mechanisms for parasite survival and growth were underscored by in vitro cultivation experiments in which the addition of an inhibitor of insulin receptor tyrosine kinases led to vesicle degradation and death. Based on the above outlined molecular data on the interaction between EmIR and mammalian insulin, the parasite’s insulin receptor orthologue most probably mediates the insulin effects on parasite growth and is, therefore, a potential candidate factor for host-parasite communication via evolutionary conserved pathways. In a final set of experiments, signaling mechanisms that act downstream of EmIR have been analyzed. These studies revealed significant differences between insulin signaling in Echinococcus and the related cestode parasite Taenia solium. These differences could be associated with differences in the organo-tropism of both species.
The Mesosaurus Inland Sea covered, in the Late Paleozoic, vast areas (~5 Mio km2) of the SW-Gondwanan continental interior. Major depocentres are represented by the Karoo basins of SW-Africa and the Paraná Basin in South America. These areas were interconnected prior to the break-up of Gondwana and the subsequent opening of the South Atlantic Ocean. In Namibia and South Africa deposits of the Mesosaurus Inland Sea are preserved in the successions of the glacial Dwyka Group and the postglacial Ecca Group (Karoo Supergroup). These deposits comprise the major part of a 60-70 Ma depositional cycle and are the main focus of this study. The large-scale transgressive part of this cycle started in the Late Carboniferous with continental glacial deposits followed by marine glacial and postglacial inland sea deposits. During the Early Permian the Mesosaurus Inland Sea reached its greatest extent, which was accompanied by widespread deposition of Corg-rich sediments. The large scale regressive part is recorded by successions ranging from deep water offshore pelites and turbidite sandstones to shallow water shoreface and deltaic sandstones, deposited in a brackish environment. Shallow water inland sea sediments are in turn overlain by fluvio-lacustrine deposits, which are assigned to the Beaufort Group and form the upper part of the cycle. This successive change in the depositional environment from marine to brackish to freshwater is also reflected in the fossil record. During Dwyka times a marine association of the Gondwana faunal province was able to colonize parts of the Mesosaurus Inland Sea. Later, during lower Ecca times, the connection to the Panthalassan Ocean became insufficient to retain normal marine conditions, leading to strong faunal endemism in an isolated and brackish inland sea environ¬ment. The most well-known and widespread representatives of this endemic fauna are mesosaurid vertebrates and megadesmid bivalves. Numerous altered tuffs occur as interlayers within argillaceous sediments of the Dwyka and Ecca Group of southern Namibia. The vast majority of these altered tuffs are represented by soft and crumbly to hard and indurated, clay-mineral-rich, bentonitic layers. Another, much rarer type is represented by very hard, chert-like tuff layers, which are predominantly albitic in composition. Furthermore, tuff layers within the Gai-As Formation of the Huab area are rich in potassium feldspar and have a porcelain-like appearance. The diagenetically modified matrix is mainly crypto- to microcrystalline. Polished tuff specimen show, in some tuffs, plane lamination or bedding with two or more subunits forming a tuff layer. Some display a weakly developed lamination. Only in very rare cases were structures reminiscent of sedimentary micro-cross lamination observed. The sedimentary textures and structures of the tuffs indicate that they have been deposited mainly as distal ash-fall layers by suspension settling in water. Some may have also been deposited or modified under the influence of weak bottom currents. The primary, pyroclastic macro-components of the tuffs are mainly represented by crystals of quartz, plagio¬clase, and biotite. In some thin sections pseudo¬morphs after pyroxene or hornblende were observed. Euhedral zircon and apatite crystals were observed in almost every tuff. Vitric or formerly vitric macro-components are very rare. The matrix of the majority of the investigated tuffs is predominantly composed of clay minerals. However, the matrix of the tuffs originally consisted most probably of fine vitric ash particles. Soon after deposition the volcanic ash was diagenetically altered to smectitic clay minerals. At a later stage smectite was progressively replaced by illite under prograde conditions. Nowadays the matrix of the bentonitic tuffs is strongly illite-dominated and only in the softer tuff layers a minor smectite content can be detected. Both the primary macrocrystic components as well as the geochemistry of the altered tuffs indicate that their source magmas were mainly of intermediate composition. The abundance of splintery quartz and feldspar crystal fragments within the tuffs hints at a highly explosive plinian or phreatoplinian eruption style of the source volcanoes, which were most probably located within a subduction-related volcanic arc region along the southern margin of Gondwana. New single zircon U-Pb SHRIMP datings of tuff layers provide a much more reliable age control of the investigated sedimentary succession. U-Pb SHRIMP ages for tuff layers from the glaciogenic Dwyka Group in southwestern Africa range from 302.0 ± 3.0 to 297.1 ± 1.8 Ma. The basal part of the early post-glacial Prince Albert Formation is dated at around 290 Ma. SHRIMP ages for tuff layers from the upper part of the Prince Albert Formation, the Whitehill Formation, and the middle part of the Collingham Formation indicate that the Mesosaurus Sea reached its greatest extent at around 280 Ma.
Platelets are crucial to inhibit extensive blood loss at sites of vascular injury. However, under pathological conditions such as rupture of an atherosclerotic plaque, activated platelets form aggregates that may occlude the vessel. This can lead to heart attack and stroke. Various and complex signaling pathways in the cell are involved in the steps of platelet adhesion, activation and aggregation. Single aspects of these processes were studied in three different subprojects in this work. The Glycoprotein (GP) Ib-V-IX complex is responsible for the first contact of platelets with the vessel wall. Subsequently, GPVI can bind to collagen of the subendothelium, which initiates a signaling cascade leading to platelet activation, aggregation, characterized by integrin activation and granule secretion and platelet procoagulant activity. The latter is characterized by exposed phosphatidylserine (PS) on the platelet surface, which enhances thrombin generation and thereby the coagulation cascade. A controlled regulation of GP receptors on the platelet surface is vital for an intact response of the cell to platelet agonists. In the first subproject described here the regulation of GPV and GPVI on mouse platelets was investigated and it was found that both receptors are shed from the platelet surface in a metalloproteinase dependent manner. However, GPVI is shed upon mitochondrial injury, while GPV cleavage could be observed upon platelet stimulation. The metalloproteinase responsible for GPVI shedding remains unknown whereas the metallproteinase that sheds GPV was identified in this work as being ADAM17. This shows that the expression of both receptors underlies a controlled mechanism regulated through distinct metalloproteinases. In the second subproject the role of protein kinase C (PKC) in platelet activation and procoagulant response was investigated using PKC specific inhibitors. It was found that PKC blockage reduced platelet activation but enhanced platelet procoagulant activity. This is the first time that a dual role in platelet activation and procoagulant activity is defined for PKC. In the third project the role of the small GTPase Rac1 in platelet signaling was studied using conditional Rac1 knock out mice. It is reported here that Rac1 lies downstream of GPVI and is involved in integrin activation and cytsolic Ca2+ changes in vitro and platelet adhesion and thrombus formation in vivo. This is the first time that Rac1 is demonstrated to have a pivotal role in GPVI signaling and furthermore points to a novel, unknown pathway downstream of GPVI.
Pathogenic relevance of autoantibodies to type XVII collagen from pemphigoid gestationis patients
(2007)
Pemphigoid gestationis (PG) and bullous pemphigoid (BP) are subepidermal autoimmune blistering diseases characterized by self-reactive T and B cells specific for the transmembrane hemidesmosomal protein type XVII collagen/BP180. Major T and B cell epitopes are located within the immunodominant 16th non-collagenous domain A (NC16A) of type XVII collagen. It has been suggested that pathogenically relevant autoantibodies also bind to this immunodominant region. The aim of this study was to map the epitopes targeted by blister-inducing human autoantibodies. For this purpose, we used an in vitro model of autoantibody-induced leucocyte-dependent dermal-epidermal separation. In contrast to the majority of patients with BP (7 of 10), preadsorption against a recombinant form of the NC16A region abolished the blister-inducing potential of autoantibodies from all PG patients tested (n=5). Using overlapping synthetic peptides, we demonstrate that PG autoantibodies bind to 2 defined epitopes within the NC16A region (aa 500-514 and aa 511-523). Preadsorption using an affinity matrix containing these two epitopes completely abolished dermal-epidermal separation induced by PG autoantibodies (in 8 of 9 patients). These findings provide new insights into the pathogenesis of pemphigoid diseases and should prove helpful for the development of an antigen-specific immunoadsorption therapy in PG.
The aim of the present study was to design different dosage forms as carrier systems to deliver sorafenib to the lung of BXB-23 transgenic mice using different routes of administration. Three dosage forms were used one of them was an oil-in-water emulsion and the oral route was chosen for this experiment. The other delivery system was a liposome preparation for intratracheal instillation. In this case the oral route was considered as a control experiment. The last dosage form was PLGA microspheres. Before sorafenib administration it was important to develop a HPLC method to assess sorafenib absorption after its administration and to determine its concentrations in mouse serum. The HPLC method allowed sorafenib quantification in small volumes (30 µl) of mouse serum and tissues. The developed HPLC method was validated resulting in satisfactory selectivity, good linearity, good accuracy and precision over the concentration range examined. Sorafenib was successfully incorporated in a fat emulsion (o/w) using a traditional method resulting in a white homogenous emulsion and no particle aggregation was observed. Sorafenib exhibited antitumor activity on the lung adenoma in BXB-23 transgenic mice when administered orally (2 mg sorafenib per mouse) in the emulsion preparation. The determined effect was an approximately 29 % reduction in the tumor area of the adenoma foci and a proliferation reduction. In order to improve the pharmacological effects of sorafenib on the lung adenoma in BXB-23 mice, the targeting of sorafenib directly to the site of action (the lung) was an attractive concept. For this purpose the intratracheal route was used. Since sorafenib administration by instillation required incorporation of sorafenib in a dosage form suitable for its lipophilic nature, a liposome suspension was the second dosage form used. A lyophilization method was employed for sorafenib liposome preparation utilizing dilauroylphosphatidylcholine (DLPC) which is safe and tolerable for the lung. Incorporation of sorafenib in the liposomes did not influence the particle size and its distribution. The sorafenib liposomes showed high encapsulation efficiency, good stability at 4 °C for one month and satisfactory in vitro release properties and inhibited Raf-1 mediated activation of ERK in cell culture assay. In a pharmacokinetic experiment sorafenib loaded liposomes were instilled directly into the lung. The results revealed that a significant level of sorafenib was achieved in the lung tissues after 2 hours and then reduced after 48 h and remained nearly constant for one week. On the other hand, only traces of sorafenib were found in the mice serum up to 48 h. Subsequently, the pharmacological activity of sorafenib (1 mg per mouse) was studied when delivered in a liposomal suspension intratracheally to treat the lung adenoma of BXB-23 mice. The data of this experiment demonstrated that sorafenib intratracheal instillation resulted in a reduction of tumor area of adenoma foci (67 %) and an elevation of the percent of apoptotic cells. In contrast, prolongation of the treatment period did not further enhance sorafenib activity on the lung adenoma. This previous finding suggested a development of multidrug resistance (MDR) by the adenoma foci cells against sorafenib instillation, which was examined by immunohistochemistry staining. The percent of MDR positive cells was higher after two and three weeks sorafenib liposome instillation treatment than that after one week treatment. The last dosage form used for sorafenib was microspheres, which were prepared by emulsion-diffusion-evaporation method using biodegradable PLGA 50:50 resulting in a white lyophilized powder. The system was characterized physicochemically and revealed a good microspheres yield, high encapsulation efficiency, a homogenous particle size distribution and slow in vitro release of sorafenib. The other strategy studied in the present research project was gene delivery to target the lung bearing tumor of BXB-23 mice using a non-viral vector (polyethylenimine). Polyethylenimine (PEI) was used to investigate its efficiency in transfecting lung bearing tumor of BXB-23 mice model and its ability to transfect the adenoma foci cells. LacZ, which encodes Beta-galactosidase was used in the present study as a reporter gene and was complexed with PEI before delivered intravenously. A high LacZ expression in the alveolar region with some expression in the adenoma foci was observed. On contrary, a low LacZ expression in the alveoli and in the adenoma foci was achieved after instillation of the same polyplex intratracheally.
The generation of high harmonics is an ideal method to convert frequencies of the infrared- or visible range into the soft x-ray range. This process demands high laser intensities that are nowadays supplied by femtosecond laser systems. As the temporal and spatial coherence properties of the laser are transferred during the conversion process, the generated high harmonics will propagate as a beam with high peak-brightness. Under ideal conditions the generation of soft-x-ray pulses shorter than one femtosecond is possible. These properties are exploited in many applications like time-resolved x-ray spectroscopy. The topic of this thesis is the generation and optimization of high harmonics. A variety of conversion setups is investigated (jet of noble gas atoms, gas-filled hollow-fiber, water microdroplets) and theoretical models present ideas to further enhance the conversion efficiency (using excited atoms or aligned molecules). In different setups the peak intensity of the fundamental laser pulses is increased by spectral broadening and subsequent temporal compression. This is achieved with the help of pulse shaping devices that can modify the spectral phase and therefore also the temporal intensity distribution of laser pulses. These pulse shaping devices are controlled by an evolutionary algorithm. With this setup not only adaptive compression of laser pulses is possible, but also the engineering of specific laser pulse shapes to optimize an experimental output. This setup was used to influence the process of high harmonic generation. It is demonstrated that the spectral distribution of the generated soft-x-ray radiation can be controlled by temporal pulse shaping. This method to tailor high harmonics is complemented by spatial shaping techniques. These findings demonstrate the realization of a tunable source of soft-x-ray radiation.
In physiological conditions platelets have a major role in maintaining haemostasis. Platelets prevent bleeding from wounds by distinguishing normal endothelial cells in vasculature from areas with lesions to which they adhere. Interaction of platelet agonists and their receptors is controlled by intracellular signaling molecules that regulate the activation state of platelets. Very important intracellular signaling molecules are cyclic nucleotides (cGMP and cAMP), both involved in inhibition of platelet activation. Formation of cGMP and cAMP in platelets is stimulated by endothelial-derived NO and prostacyclin (PGI2), which then mediate inhibition of platelets by activating protein kinase G (PKG) and protein kinase A (PKA). Recently, it has been suggested that reactive oxygen species (ROS) represent new modulators of cell signaling within different cell types. The work summarized here describes the involvement of platelet ROS production in platelet activation, the relation of NO/cGMP/PKG I pathway to ROS and to mitogen-activated protein kinases (MAP kinase) signaling, and the involvement of cyclic nucleotides in megakaryocyte and platelet development. Platelets activated with different agonists produce intracellular but not extracellular ROS by activation of NAD(P)H oxidase. In addition, ROS produced in platelets significantly affects αIIbβ3 integrin activation but not alpha/dense granule secretion and platelet shape change. Thrombin induced integrin αIIbβ3 activation is significantly decreased after pretreatment of platelets with NAD(P)H oxidase inhibitors and superoxide scavengers. These inhibitors also reduce platelet aggregation and thrombus formation on collagen under high shear and achieve their effects independently of the NO/cGMP pathway. ADP secreted from platelet dense granules with subsequent activation of P2Y12 receptors as well as thromboxane A2 release are found to be important upstream mediators of p38 MAP kinase activation by thrombin. However, p38 MAP kinase activation does not significantly contribute to calcium mobilization, P-selectin expression, αIIbβ3 integrin activation and aggregation of human platelets in response to thrombin. Finally, PKG activation does not stimulate, but rather inhibit, p38 and ERK MAP kinases in human platelets. Further study revealed that cyclic nucleotides not only inhibit platelet activation, but are also involved, albeit differentially, in megakaryocyte and platelet development. cAMP is engaged in haematopoietic stem cell differentiation to megakaryocytes, and cGMP has no impact on this process. While PKA is already present in stem cells, expression of proteins involved in cGMP signaling (soluble guanylyl cyclase, sGC; PKG) increases with maturation of megakaryocytes. In the final step of megakaryocyte maturation that includes release of platelets, cGMP and cAMP have mild but opposing effects: cGMP increases platelet production while cAMP decreases it indicating a finely regulated process that could depend on stimulus coming from adjacent endothelial cells of sinusoids in bone marrow. The results of this thesis contribute to a better understanding of platelet regulation and of the possible molecular mechanisms involved in megakaryocyte maturation in bone marrow vascular microenvironment.
Conjugation of reactive intermediates of drugs with proteins or DNA may result in toxic effects such as hepatotoxicity, agranulocytosis, allergies, tumors, etc. From 1975 to 1999, 2.9% of drugs were withdrawn from the market due to such severe adverse drug reactions. Thus, formation of chemically reactive intermediates is a widely discussed problem in drug development processes. Early detection of potentially toxic compounds is required for drug discovery and drug development. Conjugation of such electrophilic compounds with glutathione (GSH) is one of the most important detoxifying reactions in vivo. Processing of these GSH-conjugates ultimately leads to the formation of renally cleared mercapturic acids, which may also be oxidized to sulfoxides. Thus, mercapturic acids may be generated and detected in vitro and non-invasively in vivo in urine to assess the reactivity of a compound in early stages of drug development processes. Therefore, the aim of this work was to develop and evaluate a HPLC-MS/MS screening method for simple and rapid detection and characterization of known and unknown mercapturic acids and application of the method to several different matrices. Based on the common constant neutral loss (CNL) of 129 Da of all mercapturic acids tested (in negative ion mode), a CNL survey scan was performed using a linear ion trap instrument and was combined with two enhanced product ion (EPI) scans with different collision energies to characterize the detected signals. The CNL resulted from the cleavage between the sulfur and the carbon atom in the N-acetyl-L-cysteine moiety. After optimization of the experimental parameters, the detection limits of the reference substances in rat urine ranged from 0.3 to 15.5 pmol on column (i.e. 20 ng/ml to 800 ng/ml). For in vitro evaluation of the method, the model compounds acetaminophen, diclofenac, bifonazole, clozapine, troglitazone, carbamazepine, and bisphenol A were screened for formation of reactive intermediates and, hence, detection of the corresponding mercapturic acids. To determine possible species- and tissue-specific toxicities, the model compounds were incubated with stimulated neutrophils and with liver microsomes from rats and humans. Species-specific differences were observed in incubations of acetaminophen and diclofenac with rat and human hepatic microsomes. Tissue-specific differences in biotransformation of the model compounds in incubations with human neutrophils and human liver microsomes were observed for diclofenac, carbamazepine, clozapine, and bifonazole. The developed HPLC-MS/MS method was also evaluated in vivo by analysis of rat and human urine. Drug-related mercapturic acids were detected in urine of rats orally treated with acetaminophen (20 mg/kg and 640 mg/kg b.w.) or diclofenac (10 mg/kg and 20 mg/kg b.w.). Human urine samples were analyzed before and after oral administration of a clinically used dose of 500 mg and 50 mg of acetaminophen. Besides detection of the mercapturic acid of N-acetylbenzoquinoneimine (AAP-MA), a second mercapturic acid with m/z 327 occurred dose-dependently in rat and human urine samples after administration of acetaminophen. Further investigations on identification of this metabolite using authentic compounds and comparing their MS/MS mass spectra demonstrated oxidation of AAP-MA to stereoisomeric sulfoxides in vivo. For diclofenac, a novel mercapturic acid with m/z 441 was detected in rat urine samples that was identical to a metabolite obtained in incubations with human neutrophils before. The in vivo formation of this diclofenac metabolite is described here for the first time. In addition, three endogenously formed mercapturic acids were detected and identified. In conclusion, the results of the in vitro and in vivo evaluation demonstrate the advantages of the rapid and generic HPLC-MS/MS screening method for the detection of mercapturic acids, that can be obtained with a minimum of sample preparation and a high throughput in diverse matrices.
In spite of the progress made in deciphering regulatory networks of cancer cells on the molecular level, the interaction of tumour cells with their stroma has not been adequately analyzed. Earlier, we have addressed the hypothesis that the murine embryonic microenvironment can induce the differentiation of human tumour cells. To examine such interactions, human leukaemic AML cells were injected into pre-implantation murine blastocysts at embryonic day 3.5 of gestation. Analysis of developing mice revealed the presence of human AML cells in chimaeric embryos and adults and the appearance of haematopoietic differentiation markers on progeny of injected human AML cells. This finding strengthens the notion that the embryonic microenvironment is capable of regulating the proliferation and differentiation of leukaemic AML cells. Based on these results, I embarked to analyse the consequences of stromal environment-induced changes in human AML cells upon in vitro coculture with selected haematopoietic stromal cell lines in terms of changes in differentiation and proliferation properties of AML cells. For this purpose, established human AML cell lines were cocultured on a variety of mitotically inactivated stromal cell lines derived from different murine embryonic/foetal haematopoietic sites such as yolk sac, aorta-gonad-mesonephros (AGM) region and foetal liver. To score for coculture-induced changes, I compared the morphology, histo-chemical properties, immunophenotype, proliferation rate, and gene expression profile in cocultured and non-cocultured AML cells. Results show that, upon coculture of Kasumi-1 cells- a cell line established from a FAB class M2 patient - with AGM-derived DAS 104-4, but not with other stromal cell lines, Kasumi-1 AML cells exibit decreased proliferation and colony formation capabilities and acquire differentiated morphologies. Along this line, coculturing of Kasumi-1 cells resulted in the up-regulation of the myelo-monocytic lineage cell surface markers CD11b and CD14. Coculture also resulted in increase in lysosomal marker CD68, a hallmark of myeloid differentiation. Interestingly, apart from cell lines, coculture on DAS 104-4 stroma was also efficient in inducing myeloid differentiation of patient derived primary M2-AML cells. Moreover, cocultivation of KG-1 cell line on DAS 104-4 showed activation of -globin transcription and up-regulation of Glycophorin A on its surface, which indicate DAS 104-4 coculture-induced erythroid differentiation of KG-1 cells. Analysis of the proliferation rate of Kasumi-1 cells using the CFSE retention assay revealed that upon cocultivation on DAS 104-4, but not on NIH 3T3 cells, there is a decrease both in the proliferation rate and in the frequency of colony forming cells in clonogenic methyl cellulose cultures. Cell cycle analysis revealed the coculture-induced accumulation of G1-G0 stage cells. Gene-expression analysis by quantitative RT-PCR revealed a substantial decrease in the amount of AML1 and AML1-ETO fusion transcripts in parallel with an increase in p16, p21, C/EBP and PU.1 transcription levels. Interestingly, AML1-ETO transcription down-regulation of AML cells needs direct contact with DAS 104-4 cells. Knocking down AML1-ETO expression by siRNA strategy led to reduction in proliferation and depletion of colony forming cells in Kasumi1 cell population. siRNA-mediated AML1-ETO knock-down Kasumi-1 cells showed increased susceptibility to stroma-induced myeloid differentiation. However, on its own, AML1-ETO down-regulation was not sufficient to induce myeloid differentiation. This indicates that AML1-ETO down-regulation may have an active role on the coculture-induced effect but in addition to AML1-ETO down-regulation, further stimuli are required for the coculture-induced myeloid differentiation in the AML cells. In summary, in the present study I established and characterised a coculture-based in vitro system, which is capable of reducing the proliferation while inducing differentiation of human AML cells. The concept emerging from the studies indicates that the stroma environment can affect leukaemic cell proliferation and differentiation in contact-dependent and CD44 activation-independent manner. Furthermore, this study emphasizes the role of AML1-ETO in AML and indicates that AML1-ETO down-regulation is involved in the stroma-induced differentiation of Kasumi-1 cells. The result described here encourages further investigation into the mechanistic details of molecular and cellular interactions between the leukaemic cells and their stroma, which in turn may lead to the identification of new paradigms for a knowledge-based control and reprogramming of leukaemic cells.
Trinidad, V.S. Naipaul’s native island, is consistently represented in the 2001 Nobel Prize winner’s fictional works, above all in "The Mystic Masseur" (1957), "The Suffrage of Elvira" (1958), "Miguel Street" (1959), "A House for Mr Biswas" (1961), "A Flag on the Island" (1967), "The Mimic Men" (1967), "In a Free State" (1971), "Guerrillas" (1975), "The Enigma of Arrival" (1987) and "A Way in the World" (1994). The present dissertation analyses representations of Trinidad as “play-culture” in the aforementioned writings by initiating a methodological dialogue between postcolonial/cultural studies on the one hand and performance studies, play theory, as well as cultural anthropology on the other hand. The study is divided into three parts corresponding to the three main facets of Trinidad as it appears in Naipaul’s fiction: firstly, as a childish world; secondly, as a festive place and thirdly, as a playground for the western imagination. The image of Trinidad as a childish space stands at the intersection of the autobiographical genre with the colonial/Social Darwinist discourse of the so-called “child races”. In both cases we have to do with a cultural construct of childhood whose main stereotypical features are smallness, imitation, irrationality and of course, playfulness. The second part of the dissertation focuses on the importance of rituals and festivals in shaping up Indian and African identities in Trinidad. Roughly, Hindu rituals are capital means to create diasporic Indias, whereas Carnival is a powerful symbol of the Afro-Trinidadian community. Nevertheless, they carry the potential of becoming genuine liminal spaces, where ethnic boundaries are transgressed. The third section is devoted to a discourse of play as imagination. In this respect, Trinidad appears as an adventure playground where the Westerner projects his/her desires, sometimes under the mask of scientific respectability. The eye of the European sees the tropical island as an exotic Garden of Eden, as an aesthetic space with strong pictorial and theatrical qualities. But if Trinidad occurs as an artistic, a fictional object, then Naipaul’s novels and stories describing it are fiction about fiction, and so have a very important metafictional component. At this stage, since metafiction is also a capital element of postmodernism, I trace back Naipaul’s ludic metaphors to the present-day Zeitgeist, pointing out the postmodern elements in his texts dealing with Trinidad.
This volume brings together several authors from different areas of psychology and the neighbouring social sciences. Each one contributes their own perspective on the growing interest topic of subjective well-being. The aim of the volume is to present these divergent perspectives and to foster communication between the different areas. Split into three parts, this volume initially discusses the general perspectives of subjective well-being and addresses fundamental questions, secondly it discusses the dynamics of subjective well-being and more specific research issues to give a better understanding of the general phenomenon, and thirdly the book emphasizes the social context in which people experience and report their happiness and satisfaction. The book will be of great interest to social and clinical psychologists, students of psychology and sociology and health professionals.
Regulation of mitotic progression : Focus on Plk1 function and the novel Ska complex at kinetochores
(2006)
During mitosis the duplicated chromosomes have to be faithfully segregated into the nascent daughter cells in order to maintain genomic stability. This critical process is dependent on the rearrangement of the interphase microtubule (MT) network, resulting in the formation of a bipolar mitotic spindle. For proper chromosome segregation all chromosomes have to become connected to MTs emanating from opposite spindle poles. The MT attachment sites on the chromosomes are the kinetochores (KTs), which are also required to monitor the integrity of KT-MT interactions via the spindle assembly checkpoint (SAC). The first part of this work concerns the action of Polo-like kinase 1 (Plk1). Plk1 is one of the most prominent mitotic kinases and is involved in the regulation of multiple essential steps during mitosis consistent with its dynamic localisation to spindle poles, KTs and the central spindle. Despite a nice model of Plk1 targeting to different mitotic structures via its phosphopeptide binding Polo-box domain (PBD), the exact molecular details of Plk1 functioning, in particular at the KTs, remain obscure. By two different approaches we obtained cells with an unlocalised Plk1 kinase activity: first by generating stable HeLa S3 cell lines, which upon induction expressed the PBD and thus displaced endogenous Plk1 from its sites of action. Secondly, by rescuing cells RNAi-depleted of Plk1 with the catalytic Plk1 domain only. Centrosome maturation, bipolar spindle assembly and loss of cohesion between the chromatid arms proceeded normally in either cells, in contrast to Plk1-depleted cells, arguing that PBD-mediated targeting of Plk1 is less critical for the tested functions. Remarkably, however, both the PBD expressing as well as the Plk1-depleted cells rescued with the catalytic domain of Plk1 arrested in early mitosis in a SAC-dependent manner with uncongressed chromosomes. These data disclose a so far unrecognised role of Plk1 in proper chromosome congression and point at a particular requirement for PBD-mediated localised Plk1 activity at the KTs. In the second part of the thesis, we characterised a novel spindle and KT associated protein, termed Ska1, which was originally identified in a spindle inventory. Ska1 associated with KTs following MT attachment during prometaphase and formed a complex with at least another novel protein of identical localisation, called Ska2. Ska1 was required for Ska2 stability in vivo and depletion of either Ska1 or Ska2 resulted in the loss of both proteins from the KTs. The absence of Ska proteins did not disrupt overall KT structure but most strikingly induced cells to undergo a prolonged SAC-dependent delay in a metaphase-like state. The delay was characterised by weakened kinetochore-fibre stability, recruitment of Mad2 protein to a few KTs and the occasional loss of individual chromosomes from the metaphase plate. These data indicate that the Ska1/2 complex plays a critical role in the maintenance of a KT-MT attachments and/or SAC silencing.
Solid organ transplantation is an established therapeutic approach in modern medicine to extend and to improve the life of patients in the final stages of organ failure. Transplantation between genetically non-identical individuals leads to the activation of the transplant recipient's immune system. This alloimmune response is a consequence of the recognition of foreign MHC molecules by alloreactive host T cells. To prevent their activation and the subsequently induced activation of further cell subsets (e.g. B cells, cytotoxic T cells, macrophages)immunosuppressive drugs are absolutely necessary in the clinic. However,permanent immunosuppression leads to severe side effects such as nephrotoxicity, diabetes and hyperlipidaemia, and a reduced immunity to infections and malignant diseases. At the moment, there is no real alternative to immunosuppression. The purpose of this study was to analyse the importance of rat dendritic cells with immune inhibitory properties to prevent the immune activation after experimental transplantation. The rat is one of the most important animal models for experimental organ transplantation in a clinic-relevant procedure. In order to modulate the immune response after transplantation in an antigenspecific manner, the strategy should include the alloantigens. These antigens have to be presented by immature dendritic cells in the absence of costimulatory signals in order to turn alloreactive T cells into anergic or regulatory T cells instead of effector T cells. For a certain rat model of allograft rejection,the immunodominant peptide P1 was identified as an important alloantigen which accelerates graft rejection. Such a model offers an attractive and practical approach to analyse the potential of host tolerogeneic dendritic cells pulsed with P1 to suppress the allograft-induced immune response in an antigen-specific manner without the need of chronic immunosuppression. A homogenous population of rat immature dendritic cells was generated from bone marrow precursors cultured with GM-CSF and IL-4 (= IL-4 DCs) or GM65 CSF and IL-10 (= IL-10 DCs). These cells with an identical immature phenotype showed no or a very low surface expression of costimulatory molecules like CD80 and CD86 and a 10-fold reduced expression of MHC class II molecules in comparison to mature splenic DCs. No obvious difference was observed between the phenotype of the IL-4 DCs and the IL-10 DCs. Neither IL-4 DCs nor IL-10 DCs were able to activate naïve T cells or to restimulate antigen-specific T cells. This strong inhibitory effect, mediated within 24 hours, was dependent on the number of immature dendritic cells added to the proliferation assay. Antigen-specific T cells pre-incubated with IL-4 DCs and IL-10 DCs, respectively, were not able to proliferate in the presence of P1-pulsed mature DCs. This anergic state was reversible with the addition of exogenous IL-2. T cells incubated with IL-4 DCs (= IL-4 DC-Ts) were able to inhibit the T cell proliferation in a cell number dependent manner. In contrast, antigen-specific T cells pre-incubated with P1-pulsed IL-10 DCs (= IL-10 DC-Ts)showed no effect on the proliferation assay. This was the unique difference between IL-4 DCs and IL-10 DCs found in the present study. Immature DCs influenced also the immune response after transplantation. Different numbers of P1-loaded immature IL-4 DCs and IL-10 DCs were transferred intravenously into Lewis rats one day before transplantation. The best results were obtained with 30 million P1-pulsed immature DCs which prolonged the survival time to a median of 11.2 ± 1.6 days. In addition, the antigen specificity of this effect was demonstrated with a third-party graft from Brown Norway donors. These findings suggest that an antigen-specific modulation of the immune response is possible using immature dendritic cells loaded with the allogeneic antigens. Even more, the protocols described in the present study show that the immune system can be, at least temporarily, controlled after transplantation without the use of immunosuppressive drugs.
The obligate intracellular gram-negative bacterium, Chlamydophila pneumoniae (Cpn), has a significant impact as an acute and chronic disease-causing pathogen. Its potential to undergo persistent infections has been linked to chronic diseases. Several in vitro cell culture models are used to study persistent conditions, mainly IFN_ stimulation, treatment with antibiotics and iron depletion. Little is known about changes in the Cpn transcriptome during the acute and persistent infection. Therefore, the Cpn transcriptome during its acute developmental cycle and iron depletion-mediated persistence was examined in this study. Based on expression profiles, genes with similar expression changes formed 12 clusters using the self-organizing map algorithm. While other studies define genes based on their onset of transcription, here the important feature for clustering was the expression profile. This turned out to be more appropriate for comparing the time specific relevance of a certain cluster of genes to their proposed functions in the cycle. The Cpn clusters were grouped into the 'Early', 'Mid' and 'Late' classes as described for Ctr. Additionally, a new gene expression class containing genes with steadily increasing expression at the end of the developmental cycle was defined and termed 'Tardy' class. Comparison of the Cpn clusters to published proteomics data showed that genes encoding elementary body (EB) proteins peaked in the 'Late' gene cluster. This indicated that genes of the ‘Late’ and ‘Tardy’ class have different roles in RB to EB re-differentiation. Moreover, using lexical comparison the EB mRNA profile was significantly linked to the ‘Tardy’ cluster class. This provided evidence that initial translation in the cycle might be directed from stable transcripts present in the infectious EB form. Based on these criteria the novel ‘Tardy’ class was separated from the ‘Late’ class. The gene ontologies were used to identify specific pathways and physiological functions active during the different phases of development. Additionally, the transcriptome of Cpn in the persistent stage was compared to that of the acute developmental cycle. The Cpn transcriptome was altered in the iron-depletion mediated persistence. Genes upregulated were linked to clusters at the beginning of the developmental cycle, and genes down-regulated were linked to clusters at the end of the developmental cycle. These data provided strong evidence that the Cpn transcriptome during persistence is a gene expression arrest in mid-development. In early acute infection convergently or divergently oriented gene pairs preferentially had an antagonistic expression profile, whereas tandemly oriented gene pairs showed a correlated expression profile. This suggests that the Cpn genome is organized mainly in tandemly arranged operons and in convergently or divergently oriented genes with favored antagonistic profiles. The microarray studies done with the Cpn strain CWL029 also showed expression signals for several genes annotated only for the Cpn strains AR39 and J138. BLAST comparison verified that these genes are also coded in the CWL029 genome. Several of these genes were convergently arranged with their neighboring gene and shared overlapping genome information. Among these were parB, involved in DNA segregation and rpsD, an alternative sigma factor responsible for the transcription at late stages of the developmental cycle. Both genes have been described to have major roles in the chlamydial cycle. These genes had an antagonistic expression profile at the beginning of the acute developmental cycle and in persistence, as described before to be predominant for convergently oriented genes. Real time RT-PCR analysis showed that full-length rpsD mRNA transcripts were down-regulated, whereas short-length rpsD mRNA transcripts were up-regulated during the persistent infection. This demonstrated that the rpsD promoter is activated during the persistent infection and that because of the collision of the RNA polymerases full length transcripts were down-regulated. This sigma factor-independent mechanism is known as ‘Transcriptional Interference’. This is the first description on how the alternative sigma factor rpsD might be down-regulated during persistent infections. Finally, the host cell transcriptome was analyzed in the acute and persistent infection mediated by the depletion of iron. Cpn infection triggered the upregulation of relB, involved in an alternative NF-KB signaling pathway. Several genes coding for cell cycle proteins were triggered, including cyclin G2 and cyclin D1 and inhibitors of CDK4. Taken together, this work provides insights into the modulation of the pathogen and the host transcriptome during the acute infection and the iron mediated persistent infection.
Integrins are transmembrane receptors transmitting mechanical signals from the extracellular matrix (ECM) to the cytoskeleton (outside-in-signaling). Many molecular defects in the link between cytoskeleton and ECM are known to induce cardiomyopathies. alpha v integrin appears to play a major role in several processes relevant to remodeling, such as binding and activation of matrix metalloproteinases as well as regulation of cell proliferation, migration, and differentiation. We hypothesized that alpha v integrin-mediated signaling is required for the compensatory hypertrophy after aortic banding (AB) and associated with the modulation of ECM protein expression. Mice were treated in vivo with a specific integrin alpha v inhibitor or vehicle via osmotic minipumps starting 1 day prior to aortic banding (AB). At day 2 and day 7 following AB or sham-operation, the mice were examined by echocardiography and hemodynamic analyses were performed. Treatment of alpha v Integrin inhibitor led to a dilated cardiomyopathy and congestive heart failure in AB mice (dilated left ventricle, depressed LV function, and pulmonary congestion), but not to hypertrophy as observed in mice without inhibitor treatment. Investigation of downstream signaling revealed significant activation of the p38 Mitogen-Activated Protein Kinase (MAPK), the Extracellular signal-Regulated Kinases 1 and 2 (Erk 1/2), Focal Adhesion Kinase (FAK) and tyrosine-phosphorylation of c-Src in mice 7 days after AB. This response was blunted in mice treated with integrin alpha v inhibitor. Microarrays probing for a total of 96 cell adhesion and ECM genes identified various genomic targets of integrin alpha v mediated signalling. 7 days after AB 18 ECM genes were up-regulated more than 2-fold (n=6), e.g. collagen (8.11 ± 2.2), fibronectin (2.32 ± 0.94), secreted protein, acidic and rich in cysteine (SPARC, 3.78 ± 0.12), A disintegrin-like and metalloprotease (reprolysin type) with trombospondin type 1 (Adamts-1, 3.51 ± 0.81) and Tissue inhibitor of metalloproteinase 2 (TIMP2, 2.23 ± 0.98), whereas this up-regulation was abolished in mice that were treatd by integrin alpha v inhibitor via mini pumps. We conclude that signaling downstream of integrin alpha v is mediated by the MAPK, FAK and c-Src pathways leading to an up-regulation of extracelluar matrix components necessary for the compensatory response of the heart under a condition of pressure overload.
The objective of this Thesis was to progress the understanding of the mechanisms of cuticular uptake into living plant foliage, thereby enabling uptake of important compounds such as pesticides and pollutants to be modelled. The uptake of three model compounds, applied in the presence and absence of surfactants, into the leaves of three plant species (Chenopodium album L., Hedera helix L. and Stephanotis floribunda Brongn) was determined. The results with 2-deoxy-D-glucose (DOG), 2,4-dichlorophenoxy-acetic acid (2,4-D) and epoxiconazole in the presence of surfactants (the polyethylene glycol monododecyl ethers C12EO3, C12EO6, C12EO10, and a trisiloxane ethoxylate with mean ethylene oxide (EO) content of 7.5, all used at one equimolar concentration) illustrated that the initial dose (nmol mm-2) of xenobiotic applied to plant foliage was a strong positive determinant of uptake. Using this new approach for whole plant uptake, uptake on a per unit area basis was found to be related to initial dose of xenobiotic applied, by an equation of the form: Uptake(nmol mm-2) = a [ID]b at time t = 24 hours, where ID is the initial dose or the mass of xenobiotic applied per unit area (M(nmol xenobiotic applied)/A(droplet spread area)). Total mass uptake can then be calculated from an equation of the form: Total Uptake(nmol) = a [ID]b.A. In order to verify this relationship, further studies determined the uptake of three pesticides, applied as commercial and model formulations in the presence of a wide range of surfactants, into the leaves of three plant species (bentazone into Chenopodium album L. and Sinapis alba L., epoxiconazole and pyraclostrobin into Triticum aestivum L.). The results confirmed that the initial dose (nmol mm-2) of xenobiotic applied to plant foliage is a strong, positive determinant of uptake. In a novel approach, further studies used this relationship (nmol mm-2 uptake versus ID; termed the uptake ratio) to establish the relative importance of species, active ingredient (AI), AI concentration (g L-1) and surfactant to uptake. Species, AI, its concentration, and surfactant all significantly affected the uptake ratio. Overall, 88% of the deviance could be explained. More useful was the analysis of the individual xenobiotics, where the models explained 83%, 85%, and 94% of the variance in uptake ratio for DOG, 2,4-D, and epoxiconazole, respectively. In all cases, species, surfactant, and AI concentration significantly affected the uptake ratio. However, there were differences in the relative importance of these factors among the xenobiotics studied. Concentration of AI increased in importance with increasing lipophilicity of AI, while species was much less important for the most lipophilic compound. Surfactant became less important with increasing AI lipophilicity, although it was always important. The preceding studies considered uptake at only one time interval (24 hours). Total uptake after 24 hours can be the same for a compound formulated with different surfactants, but rates of uptake (and therefore rain-fastness and subsequent translocation to target sites) can be quite different. Therefore, there was a requirement to be able to model uptake over time into whole plants. Hence, the objective of further studies was to determine whether a logistic-kinetic penetration model, developed using isolated plant cuticles, could be applied to whole plant uptake. Uptake over 24 hours was determined for three model compounds, applied in the presence and absence of surfactants, into the leaves of two plant species. Overall, the model fitted the whole plant uptake data well. Using the equations developed, based on initial dose, to calculate uptake at 24 hours, in conjunction with the logistic-kinetic model, has significantly progressed our understanding and ability to model uptake. The advantages of the models and equations described are that few variables are required, and they are simple to measure.
DNA microarrays have become a standard technique to assess the mRNA levels for complete genomes. To identify significantly regulated genes from these large amounts of data a wealth of methods has been developed. Despite this, the functional interpretation (i.e. deducing biological hypothesis from the data) still remains a major bottleneck in microarray data analysis. Most available methods display the set of significant genes in long lists, from which common functional properties have to be extracted. This is not only a tedious and time-consuming task, which becomes less and less feasible with increasing numbers of experimental conditions, but is also prone to errors, since it is commonly done by eye. In the course of this work methods have been developed and tested, that allow for a computerbased analysis of functional properties being relevant in the given experimental setting. To this end the Gene Ontology was chosen as an appropriate source of annotation data, because it combines human-readability with computer-accessibility of the annotations term and thus allows for a statistical analysis of functional properties. Here the gene-annotations are integrated in a Correspondence Analysis which allows to visualize genes, hybridizations and functional categories in a single plot. Due to the increasing amounts of available annotations and the fact that in most settings only few functional processes are differentially regulated, several filter criteria have been developed to reduce the number of displayed annotations to a set being relevant in the given experimental setting. The applicability of the presented visualization and filtering have both been validated on datasets of varying complexity. Starting from the well studied glucose-pathway in S. cerevisiae up to the comparison of different tumor types in human. In both settings the method generated well interpretable plots, which allowed for an immediate identification of the major functional differences between the experimental conditions [90]. While the integration of annotation data like GO facilitates functional interpretation, it lacks the capability to identify key regulatory elements. To facilitate such an analysis, the occurrence of transcription factor binding sites in upstream regions of genes has been integrated to the analysis as well. Again this methodology was biologically validated on S. cerevisiae as well human cancer data sets. In both settings TFs known to exhibit central roles for the observed transcriptional changes were plotted in marked positions and thus could be immediately identified [206]. In essence, integration of supplementary information in Correspondence Analysis visualizes genes, hybridizations and annotation data in a single, well interpretable plot. This allows for an intuitive identification of relevant annotations even in complex experimental settings. The presented approach is not limited to the shown types of data, but is generalizable to account for the majority of the available annotation data.
In pursuit of a novel generation of devices, exploration of spin properties of the particles is needed. Spintronics is a modern field in physics which exploits spin properties to be used in addition to the charge degree of freedom. Since the conductivity mismatch problem presents a fundamental obstacle for electrical spin injection from a ferromagnetic metal into a diffusive semiconductor [SFM+00], other means for injecting spin-polarized carriers must be used. With a tunnel contact, it is possible to achieve a highly spin-polarized room-temperature tunnel injection [JWS+05]. We used a novel approach and applied magnetic RTDs for spin manipulation. In this work, properties of all-II-VI magnetic resonant tunneling diodes (RTDs), as applied to spintronics, were reported. Growth conditions were optimized to increase the peak-to-valley ratio, and the design of the RTDs was optimized for observation of spin related transport effects. When an external magnetic field was applied, spin manipulation became possible. Selforganized CdSe quantum structures were grown and investigated using optical means. After embedding them into a (Zn,Be)Se tunneling barrier, the properties were assessed by the resonant tunneling.
Data mining has proved its significance in various domains and applications. As an important subfield of the general data mining task, subgroup mining can be used, e.g., for marketing purposes in business domains, or for quality profiling and analysis in medical domains. The goal is to efficiently discover novel, potentially useful and ultimately interesting knowledge. However, in real-world situations these requirements often cannot be fulfilled, e.g., if the applied methods do not scale for large data sets, if too many results are presented to the user, or if many of the discovered patterns are already known to the user. This thesis proposes a combination of several techniques in order to cope with the sketched problems: We discuss automatic methods, including heuristic and exhaustive approaches, and especially present the novel SD-Map algorithm for exhaustive subgroup discovery that is fast and effective. For an interactive approach we describe techniques for subgroup introspection and analysis, and we present advanced visualization methods, e.g., the zoomtable that directly shows the most important parameters of a subgroup and that can be used for optimization and exploration. We also describe various visualizations for subgroup comparison and evaluation in order to support the user during these essential steps. Furthermore, we propose to include possibly available background knowledge that is easy to formalize into the mining process. We can utilize the knowledge in many ways: To focus the search process, to restrict the search space, and ultimately to increase the efficiency of the discovery method. We especially present background knowledge to be applied for filtering the elements of the problem domain, for constructing abstractions, for aggregating values of attributes, and for the post-processing of the discovered set of patterns. Finally, the techniques are combined into a knowledge-intensive process supporting both automatic and interactive methods for subgroup mining. The practical significance of the proposed approach strongly depends on the available tools. We introduce the VIKAMINE system as a highly-integrated environment for knowledge-intensive active subgroup mining. Also, we present an evaluation consisting of two parts: With respect to objective evaluation criteria, i.e., comparing the efficiency and the effectiveness of the subgroup discovery methods, we provide an experimental evaluation using generated data. For that task we present a novel data generator that allows a simple and intuitive specification of the data characteristics. The results of the experimental evaluation indicate that the novel SD-Map method outperforms the other described algorithms using data sets similar to the intended application concerning the efficiency, and also with respect to precision and recall for the heuristic methods. Subjective evaluation criteria include the user acceptance, the benefit of the approach, and the interestingness of the results. We present five case studies utilizing the presented techniques: The approach has been successfully implemented in medical and technical applications using real-world data sets. The method was very well accepted by the users that were able to discover novel, useful, and interesting knowledge.
Infrared (IR) and Raman spectroscopy are among the most widely used techniques in the physical and natural sciences today. Vibrational spectroscopy, including IR and Raman spectroscopy, has both a long and interesting history and an illustrious record of contributions to science. Spectroscopy in the pharmaceutical industry is dominated by techniques such as nuclear magnetic resonance (NMR) and mass spectrometry (MS) for the elucidation of chemical structures. Despite this, the versatility of infrared spectroscopy ensures it still remains a key technique in quality control laboratories, and in applications where solid form characterization or minimal sample preparation is a necessity. Raman spectroscopy has many uses in the pharmaceutical and chemical industry, but its strengths is in solid form analysis. It is regularly used to identify compounds, and results are used in the release of pharmaceutical and chemical products. This work consists of 8 chapters, which cover the vibrational spectroscopy beginning with the theory and instrumentation, continuing with the experimental setup and probes description, and completing with results and discussions of the experiments. The first chapter of this work introduces Raman spectroscopy as a dominant technique used in pharmaceutical and chemical industry. The theoretical background regarding vibrational spectroscopy (IR and Raman) is accounted for in the second chapter of this work, while the samples presentation, the experimental procedures, and the description of the apparatus together with the computational details are briefly specified in the third chapter. The fourth chapter investigates the concentration dependent wavenumber shifts and linewidth changes of tetrahydrofuran in a binary system. Many of the applications in food science rely heavily on Raman spectroscopy, often preceding the biomedical applications. The characterization and identification of food additives using Raman, surface-enhanced Raman spectroscopy, and theoretical calculations is in detail depicted in the fifth chapter, whereas in the sixth and seventh chapters the monitoring of several medicines and various lanthanide complexes with anticancer properties, respectively, employing IR and Raman techniques are treated. These last two chapters address applications of vibrational spectroscopy to pharmaceutical products, and include the use of vibrational spectroscopy in combinatorial chemistry and density functional theory, a modality increasingly used by the pharmaceutical industry for the discovery if new pharmacologically active substances.
BAKTERIELLE ENDOSYMBIONTEN DER BIENENWÖLFE Symbiontische Interaktionen zwischen verschiedenen Arten stellen allgegenwärtige und essentielle Bestandteile natürlicher Systeme dar und haben wahrscheinlich die Evolution jedes rezenten Lebewesens beeinflusst. Insekten als die diverseste Metazoen-Klasse der Erde profitieren von dem außerordentlichen metabolischen Potenzial vieler Mikroorganismen in einer großen Anzahl mutualistischer Assoziationen. Die große Mehrheit der bisher untersuchten Symbiosen zwischen Insekten und Mikroorganismen stellen Interaktionen dar, in denen die Wirte durch die Symbionten mit essentiellen Nährstoffen versorgt werden. Es sind jedoch auch einige Fälle bekannt, in denen symbiontische Bakterien eine wichtige Rolle für die intraspezifische olfaktorische Kommunikation spielen oder zur Verteidigung gegen Pathogene oder Parasitoide dienen. Die vorliegende Arbeit untersucht eine hoch spezialisierte Assoziation zwischen einer Grabwespen-Art, dem Europäischen Bienenwolf (Philanthus triangulum, Hymenoptera, Crabronidae), und Bakterien aus der Familie der Actinomyceten. Die bakteriellen Symbionten sind an einem einzigartigen Ort zu finden: Sie werden in den Reservoiren spezialisierter Antennendrüsen weiblicher Bienenwölfe kultiviert. Das Weibchen sezerniert vor der Eiablage große Mengen dieser Bakterien in die unterirdischen Brutkammern. Wenn die Bienewolf-Larve einige Tage später ihre Nahrungsaufnahme an den von der Mutter als Nahrungsvorrat bereitgestellten Honigbienen beendet hat, nimmt sie die Bakterien auf und spinnt sie in ihren Kokon mit ein. Dort erfüllen die Symbionten eine wichtige Funktion, indem sie den Schimmelbefall herabsetzen und dadurch die Überlebenschancen der Larve im Kokon während der langen und gefährlichen Winterruhe signifikant erhöhen. Experimente, in denen Bienenwolf-Weibchen ohne die Bakterien aufgezogen wurden, und Beobachtungen an Bienenwolf-Larven deuten darauf hin, dass die Symbionten vertikal von der Mutter an die Töchter weitergegeben werden. Vermutlich werden die Bakterien während des Schlupfes oder kurz davor vom Kokon in die Antennendrüsen-Reservoire aufgenommen. Phylogenetische Untersuchungen von Wirten und Symbionten sowie Transfer-Experimente mit den Bakterien wären notwendig, um herauszufinden, ob ein horizontaler Austausch der Symbionten zwischen verschiedenen Bienenwolf-Arten möglich ist. Genetische Analysen zeigen, dass die Symbionten einer unbeschriebenen Art der Gattung Streptomyces innerhalb der Actinomyceten angehören. 16s rDNA Primer und eine fluoreszenzmarkierte Oligonukleotid-Sonde wurden entwickelt, um die Bienenwolf-Symbionten mittels PCR und Fluoreszenz-in-situ-Hybridisierung (FISH) spezifisch nachweisen zu können. Mit Hilfe von PCR und Sequenzierungen der 16s rDNA konnten nah verwandte Endosymbionten in den Antennen von 28 Arten und Unterarten der Gattung Philanthus festgestellt werden, nicht aber in anderen Gattungen der Unterfamilie Philanthinae (Aphilanthops, Clypeadon, Cerceris), so dass die Symbiose auf die Gattung Philanthus beschränkt zu sein scheint. Phylogenetische Untersuchungen auf der Grundlage nahezu kompletter 16s rDNA-Sequenzen belegen, dass die Symbionten aller analysierten Bienenwolf- Arten eine monophyletische Gruppe innerhalb der Gattung Streptomyces bilden, was darauf hindeutet, dass die Symbiose hoch spezifisch ist und wahrscheinlich das Ergebnis einer langen Koevolution und Kospeziation darstellt. Anhand von Sequenzunterschieden zwischen den Symbionten lässt sich das Alter der Assoziation zwischen Philanthus und Streptomyces auf etwa 26-67 Millionen Jahre schätzen, was der Entstehung der Gattung Philanthus entsprechen könnte. Auf der Basis von 16s rDNA Sequenzen und Ultrastruktur-Daten wurden die Antennensymbionten der Bienenwölfe als neues Taxon ‚Candidatus Streptomyces philanthi’ beschrieben, wobei die Symbionten verschiedener Wirtsarten als Ökotypen behandelt und nach der Wirtsart benannt wurden (z.B. ‚Candidatus Streptomyces philanthi triangulum’). Wie die Bakterien von der Assoziation mit Bienenwölfen profitieren, ist noch unklar. Auf jeden Fall wird ihnen vom Wirt eine unbesetzte und wahrscheinlich konkurrenzfreie ökologische Nische in den Antennen sowie eine zuverlässige Weitergabe an die nächste Generation garantiert. Außerdem sprechen einige Hinweise für eine Versorgung der Bakterien mit Nährstoffen durch den Bienenwolf: (1) Weibchen legen manchmal mehrere Brutkammern pro Tag an und sezernieren jedes Mal große Mengen an Bakterien; die Bakterien müssen sich also in den Drüsen-Reservoiren schnell vermehren, um den Vorrat an Symbionten wieder aufzufüllen. (2) Die Reservoire sind von Typ 3-Drüsenzellen umgeben, die die Bakterien mit Nährstoffen versorgen könnten. (3) Eine der Reservoir-Wände weist eine netzartige Struktur auf, die möglicherweise den Eintritt von Hämolymphe und damit von Nährstoffen in das Reservoir zulässt. Dies wird durch chemische Analysen der Kohlenwasserstoffe in der Hämolymphe und in dem Antennendrüsen-Sekret untermauert, die sehr ähnliche Zusammensetzungen aufweisen. Die Assoziation zwischen Bienenwölfen und Streptomyceten stellt den ersten bekannten Fall einer Symbiose dar, bei der Bakterien in den Antennen von Insekten kultiviert werden, und sie repräsentiert eines von wenigen Beispielen für Actinomyceten als Symbionten von Insekten. Weitere Untersuchungen evolutionärer und ökologischer Aspekte dieser Symbiose werden wertvolle Erkenntnisse über die Bedeutung von Actinomyceten für die Pathogen-Abwehr bei Insekten liefern und könnten sogar zur Entdeckung neuer Sekundärmetabolite mit antibiotischen Eigenschaften für die Verwendung in der Humanmedizin führen. CHEMISCHE KOMMUNIKATION UND PARTNERWAHL BEIM EUROPÄISCHEN BIENENWOLF Chemische Signale stellen sowohl die älteste als auch die am weitesten verbreitete Form von Kommunikation zwischen Organismen dar. Bei Insekten spielen Pheromone eine essentielle Rolle für die intraspezifische Kommunikation, und eine Vielzahl aktueller Untersuchungen belegt die Bedeutung olfaktorischer Signale für die Balz und Paarung. Die meisten dieser Studien konzentrieren sich jedoch auf Weibchen-Pheromone, während von Männchen produzierte Pheromone trotz ihrer ökologischen und evolutionären Bedeutung für die Partneranlockung und Partnerwahl bisher wenig Beachtung gefunden haben. Männchen des Europäischen Bienenwolfes etablieren und verteidigen Territorien, die sie mit einem Kopfdrüsen-Sekret markieren. Dieses Sekret wirkt höchstwahrscheinlich als ein Sex- Pheromon und lockt paarungsbereite Weibchen an. Da Männchen-Territorien meist aggregiert in der Nähe von Weibchennestern auftreten, haben die Weibchen die Möglichkeit, zwischen verschiedenen potenziellen Paarungspartnern zu wählen. Die chemischen Analysen der vorliegenden Arbeit zeigen, dass die Zusammensetzung und Menge des männlichen Markierpheromons vom Verwandtschaftsgrad, der Herkunft, dem Alter und der Größe der Männchen abhängen. Das Pheromon beinhaltet demnach Informationen über eine Vielzahl von Eigenschaften der Männchen, die für die Weibchenwahl von Bedeutung sein könnten. Sowohl die genetische Distanz („optimal outbreeding“) als auch die allgemeine genetische Qualität („good genes“) eines Männchens könnte die Partnerwahl der Bienenwolf-Weibchen beeinflussen. In dieser Arbeit für den Europäischen Bienenwolf entwickelte polymorphe Mikrosatelliten legen den Grundstein für Vaterschaftsanalysen und ermöglichen so die Durchführung und Auswertung von Experimenten zur Weibchenwahl bei dieser Art.
Virtually all existing MRI applications require both a high spatial and high temporal resolution for optimum detection and classification of the state of disease. The main strategy to meet the increasing demands of advanced diagnostic imaging applications has been the steady improvement of gradient systems, which provide increased gradient strengths and faster switching times. Rapid imaging techniques and the advances in gradient performance have significantly reduced acquisition times from about an hour to several minutes or seconds. In order to further increase imaging speed, much higher gradient strengths and much faster switching times are required which are technically challenging to provide. In addition to significant hardware costs, peripheral neuro-stimulations and the surpassing of admissable acoustic noise levels may occur. Today’s whole body gradient systems already operate just below the allowed safety levels. For these reasons, alternative strategies are needed to bypass these limitations. The greatest progress in further increasing imaging speed has been the development of multi-coil arrays and the advent of partially parallel acquisition (PPA) techniques in the late 1990’s. Within the last years, parallel imaging methods have become commercially available,and are therefore ready for broad clinical use. The basic feature of parallel imaging is a scan time reduction, applicable to nearly any available MRI method, while maintaining the contrast behavior without requiring higher gradient system performance. PPA operates by allowing an array of receiver surface coils, positioned around the object under investigation, to partially replace time-consuming spatial encoding which normally is performed by switching magnetic field gradients. Using this strategy, spatial resolution can be improved given a specific imaging time, or scan times can be reduced at a given spatial resolution. Furthermore, in some cases, PPA can even be used to reduce image artifacts. Unfortunately, parallel imaging is associated with a loss in signal-to-noise ratio (SNR) and therefore is limited to applications which do not already operate at the SNR limit. An additional limitation is the fact that the coil array must provide sufficient sensitivity variations throughout the object under investigation in order to offer enough spatial encoding capacity. This doctoral thesis exhibits an overview of my research on the topic of efficient parallel imaging strategies. Based on existing parallel acquisition and reconstruction strategies, such as SENSE and GRAPPA, new concepts have been developed and transferred to potential clinical applications.
Clonality analysis in B-Cell Chronic Lymphocytic Leukemia (B-CLL) associated with Richter's syndrome
(2006)
B-cell chronic lymphocytic leukemia (B-CLL) comprises 90% of chronic lymphoid leukemias in Western countries and patients with B-CLL have a heterogeneous clinical course. Approximately 3-5% of B-CLL patients encounter transformation to an aggressive lymphoma, mainly diffuse large B-cell lymphoma (DLBCL) or Hodgkin’s lymphoma (HL) which has been defined as Richter’s syndrome and is associated with a poor clinical outcome. The mutational status of the immunoglobulin heavy chain variable region (IgVH) gene not only implies the developmental stage at which the neoplastic transformation occurs in a given B-cell lymphoma, but also constitutes an important prognostic factor in B-CLL, since B-CLL patients with unmutated IgVH genes usually have a poor clinical outcome. Sparse molecular analyses performed in Richter’s syndrome so far suggest that it can occur in B-CLL patients carrying mutated or unmutated IgVH genes, and tumor cells in DLBCL or HL can be clonally identical to the B-CLL clone or arise as an independent, secondary lymphoma. To determine the clonal relationship between DLBCL or Hodgkin/Reed-Sternberg (HRS) cells and pre-existing B-CLL cells in a larger series, to identify the IgVH gene usage and the mutational status and to explore possible prognostic factors in B-CLL undergoing Richter’s transformation, we utilized a PCR-based GeneScan approach with subsequent sequencing of the IgVH genes. In cases with HRS/HRS-like cells laser capture microdissection (LCM) was employed to isolate these cells. In addition, a thorough morphological and immunohistochemical analysis was performed. In total, specimens from 48 patients were investigated including 40 cases of Richter’s syndrome and additional 8 cases of B-CLL cases with the presence of CD30-positive HRS-like cells. Among 40 cases of Richter’s syndrome, 34 B-CLL cases showed transformation to DLBCL and 6 cases transformed from B-CLL to HL. Sequencing was performed in 23 paired B-CLL and DLBCL cases. In 18 cases, B-CLL and DLBCL were clonally identical, whereas DLBCL developed as a clonally independent neoplasm in 5 patients. Among the clonally related pairs, 11 out of 15 cases carried unmutated IgVH genes in both the B-CLL and DLBCL component, whereas 5 of 6 B-CLL cases that showed transformation to HL carried mutated IgVH genes. HRS cells in two samples and HRS-like cells in one sample were clonally distinct from the B-CLL clone and infected by EBV, whereas one sample of HRS-like cells was related to the clone from the surrounding B-CLL cells and did not express latent membrane protein-1 (LMP1). The VH genes VH3-23, VH3-74, VH1-2 and VH3-9 were overused in B-CLL cases that transformed to DLBCL, whereas VH4-34 and VH3-48 were used in over half of the B-CLL cases with transformation to HL. Immunohistochemical staining of ZAP70 was significantly associated with unmutated IgVH genes in B-CLL cases undergoing Richter’s transformation. Clinical follow-up data could be obtained from 24 patients. The median survival times of B-CLL patients with transformation to DLBCL or HL were 7 and 21 months, respectively. No significantly different survival times were found between clonally related or unrelated cases, or between IgVH-mutated or -unmutated cases. We conclude that in Richter’s transformation, DLBCL can evolve by clonal transformation of the pre-existing B-CLL clone or occur as an independent, clonally unrelated neoplasm. In the majority of cases (78% in our series), B-CLL and DLBCL are clonally identical. In a subset of patients, however, DLBCL develops as an independent secondary neoplasm that is not clonally related to the B-CLL. Clonal transformation into DLBCL predominantly occurs in B-CLL patients with unmutated IgVH genes, whereas most B-CLL patients that show transformation to HL or CD30-positive HRS-like cells carry mutated IgVH genes. The tendency that IgVH-unmutated B-CLL transforms to DLBCL and IgVH-mutated B-CLL transforms to HL implies different transformation pathways in the two subtypes of Richter’s syndrome. In addition, important pathogenetic differences are likely to exist between DLBCL cases derived from a pre-existing B-CLL as compared to de novo DLBCL cases, since de novo DLBCL is usually characterized by mutated IgVH genes. The biased usage of IgVH genes in the two subtypes of Richter’s syndrome suggests a possible role for antigen involvement in tumorigenesis also in B-CLL cases that undergo Richter’s transformation. Finally, EBV-association in the HL variant of Richter’s syndrome occurs more frequently in clonally unrelated secondary malignancies.
In mammals, the pituitary-derived neuropeptide adrenocorticotropic hormone (ACTH) is a major regulator of adrenocortical steroidogenesis and hormone secretion. However, the mechanism by which adrenal growth is governed by pituitary signals and the role of the pituitary in early adrenal development remain to be investigated. In this work the model organism zebrafish was used to elucidate pituitary adrenal interactions during early vertebrate development. The adrenal homologue in zebrafish is located in the head kidney and termed interrenal organ. The work deals with the analysis of pituitary-interrenal interactions by using pituitary mutants, gene-knockdown embryos and pharmacological interventions. As prerequisite to the main study, zebrafish pomc gene was cloned and characterized and the interrenal organogenesis in wild-type zebrafish was analysed.
The polyspecific organic cation transporters (OCT) are involved in the elimination and distribution of drugs, environmental toxins, and endogenous organic cations including monoamine neurotransmitters. Steroid hormones inhibit organic cation transport by the three OCT subtypes with different affinities showing distinct species difference; for example, the IC50 values for corticosterone inhibition of cation uptake by transporters rOCT1 and rOCT2 are ~150μM and ~4 μM, respectively. By introducing domains and amino acids from rOCT2 into rOCT1, we identified three amino acids in the presumed 10th TMD of rOCT2 which are responsible for the higher affinity of corticosterone in comparison to rOCT1. This is the first study which revealed the components of the binding site for corticosterone in OCTs. The evidence is presented that these amino acids (alanine 443, leucine 447, and glutamine 448 in rOCT1 and isoleucine 443, tyrosine 447, and glutamate 448 in rOCT2) are probably located within the substrate binding region of OCTs since the affinity of transported cations was increased together with the affinity of corticosterone. In the double mutant rOCT1(L447Y/Q448E) the IC50 value for the inhibition of [3H]MPP (0.1 μM) uptake by corticosterone (24 ± 4 μM) was significantly higher compared to the IC50 value for inhibition of [14C]TEA (10 μM) uptake (5.3 ± 1.7 μM), indicating an allosteric interaction between transported substrate and corticosterone. The data suggest that more than one compound can bind simultaneously to the substrate binding region. These results confirm previous suggestion that binding of substrates and inhibitors to OCTs involves interaction with a comparatively large surface that may include multiple binding domains rather than with a structurally restricted single binding site.
The functionalities of DNA and RNA are mainly determined by the various interactions between the pairing nucleobases. To understand the complex interplay of the various interactions model systems are needed in which the interstrand pairing is less restricted by the backbone. Such systems are peptide nucleo acids (PNA) in which the sugar phosphate backbone of DNA or RNA is replaced by a peptide backbone. Diederichsen et al. were able to synthesize a large number of systems with an alpha-alanyl backbone to which canonical and non-canonical nucleobases were attached (alpha-alanyl-PNA). These systems formed aggregates with various binding motifs which do not appear in DNA or RNA. Especially the unusual binding motifs would allow a deep insight into the complex interplay of the interactions between nucleobases but the small solubility of alpha-alanyl PNA oligomers hampers the experimental determination of the geometrical arrangement by X-Ray or NMR. Only the overall stability of the various aggregates could be determined by measurements of melting temperatures via UV spectroscopy. Since a detailed knowledge about the geometrical structure and bonding motifs are necessary to obtain insight into the interplay of the various interactions it is the goal of the present work to achieve such information with the help of theoretical approaches. Additionally we are interested in the effects which govern the trends in the stabilities of the systems. This task should be simpler than an investigation of the absolute stabilities since many contributions (e.g. entropic and dynamic effects) can be expected to be similar for similar systems. Consequently, such effects are less important for our goal. For the investigation of all experimentally tested alpha-alanyl-PNA oligomers it was essential to parameterize the noncanonical nucleobases since they were not implemented in the standard version of the Amber4.1 force field. This was achieved by adding the missing parameters to the Amber Force Field. The charges of each nucleobase were determined by the R.E.D program package. The investigation started with the construction of all possible pairing modes for alpha-alanyl-PNA dimer. It could be observed that certain pairing modes were not realizable due to the geometrical arrangement of the dimer and the restriction of the backbone. For other pairing modes a construction was possible, but due to the geometrical restrictions of the backbone the strain in the system is so high that they fall apart during a first geometry optimization. Stable systems were then simulated by various molecular dynamics (MD)-runs. Information about their geometrical arrangements for T=0 K were obtained from geometry optimizations which were started from various points of the MD-run. The resulting geometries were found to be virtually identical. Information about the interactions within a dimer at T=0 K were obtained from a two step procedure in which the effects connected with the nucleobases and the influence of the backbone are determined separately. It was performed for the optimized geometries. In a first step the backbone was removed and the resulting dangling bonds were saturated by methyl groups. The total interaction energy between the nucleobases can now be estimated by the difference between the energy of the complete system and the sum of the energies of the single nucleobases computed at the geometries they take in the whole system. According to the carried out investigation and the resulting correlation of the melting temperature with the calculated stabilization energies the presented method seems to represent a reliable tool for the description of the PNA systems. Despite this success additional experimental verifications of our method are necessary to ensure its applicability. Such verifications could be based on geometrical information obtained via X-Ray or NMR investigations. More detailed data about entropic an enthalpic contribution to the stability of the various complexes would also be very helpful to verify and improve our approach. Such information could be either obtained from a careful analysis of shape of the melting temperature curve or from microcalorimetric investigations. If such tests confirm our predictions the approach could be extended and applied to neighboring fields as for examples beta-alanyl-PNA, DNA or RNA systems with unusual nucleobases. Such information is also necessary to extend our approach in a way that dynamic and/or entropic effects are also taken into account.
High-harmonic generation provides a powerful source of ultrashort coherent radiation in the XUV and soft-x-ray range, which also allows for the production of attosecond light pulses. Based on the unique properties of this new radiation it is now possible to perform time-resolved spectroscopy at high excitation energies, from which a wide field of seminal discoveries can be expected. Since the exploration and observation of the corresponding processes in turn are accompanied by the desire to control them, this work deals with new ways to manipulate and characterize the properties of these high-harmonic-based soft-x-ray pulses. After introductory remarks this work first presents a comprehensive overview over recent developments and achievements on the field of the control of high-harmonic radiation in order to classify the experimental results obtained in this work. These results include the control of high-harmonic radiation both by temporally shaping and by manipulating the spatial properties of the fundamental laser pulses. In addition, the influence of the conversion medium and of the setup geometry (gas jet, gas-filled hollow fiber) was investigated. Using adaptive temporal pulse shaping of the driving laser pulse by a deformable mirror, this work demonstrates the complete control over the XUV spectrum of high harmonics. Based on a closed-loop optimization setup incorporating an evolutionary algorithm, it is possible to generate arbitrarily shaped spectra of coherent soft-x-ray radiation in a gas-filled hollow fiber. Both the enhancement and suppression of narrowband high-harmonic emission in a selected wavelength region as well as the enhancement of coherent soft-x-ray radiation over a selectable extended range of harmonics (multiple harmonics) can be achieved. Since simulations that do not take into account spatial properties such as propagation effects inside a hollow fiber cannot reproduce the experimentally observed high contrast ratios between adjacent harmonics, a feedback-controlled adaptive two-dimensional spatial pulse shaper was set up to examine selective fiber mode excitation and the optimization of high-harmonic radiation in such a geometry. It is demonstrated that different fiber modes contribute to harmonic generation and make the high extent of control possible. These results resolve the long-standing issue about the controllability of high-harmonic generation in free-focusing geometries such as gas jets as compared to geometries where the laser is guided. Temporal pulse shaping alone is not sufficient. It was possible to extend the cutoff position of harmonics generated in a gas jet, however, selectivity cannot be achieved. The modifications of the high-harmonic spectrum have direct implications for the time structure of the harmonic radiation, including the possibility for temporal pulse shaping on an attosecond time scale. To this end, known methods for the temporal characterization of optical pulses and high-harmonic pulses (determination of the harmonic chirp on femtosecond and attosecond time scales) were introduced. The experimental progress in this work comprises the demonstration of different setups that are in principle suitable to determine the time structure of shaped harmonic pulses based on two-photon two-color ionization cross-correlation techniques. Photoelectron spectra of different noble gases generated by photoionization with high-harmonic radiation reproduce the spin-orbit splitting of the valence electrons and prove the satisfactory resolution of our electron time-of-flight spectrometer for the temporal characterization of high harmonics. Unfortunately no positive results for this part could be achieved so far, which can probably be attributed mainly to the lack of the focusability of the high harmonics and to the low available power of our laser system. However, we have shown that shaping the high-harmonic radiation in the spectral domain must result in modifications of the time structure on an attosecond time scale. Therefore this constitutes the first steps towards building an attosecond pulse shaper in the soft-x-ray domain. Together with the ultrashort time resolution, high harmonics open great possibilities in the field of time-resolved soft-x-ray spectroscopy, for example of inner-shell transitions. Tailored high-harmonic spectra as generated in this work and shaped attosecond pulses will represent a multifunctional toolbox for this kind of research.
Human cytomegalovirus (HCMV) infection causes clinical symptoms in immunocompromised individuals such as transplantant recipients and AIDS patients. The virus is also responsible for severe complications in unborn children and young infants. The species specificity of HCMV prevents the direct study of mechanisms controlling the infection in animal models. Instead, the murine cytomegalovirus (MCMV) is used as a model system. Human and murine CMVs have large double-stranded DNA genomes, encoding nearly 170 genes. About 30% of the genes are committed to essential tasks of the virus. The remaining genes are involved in virus pathogenesis or host interaction and are dispensable for virus replication. The CMV genes are classified in gene families, based on sequence homology. In the present work, the function of two genes of the US22 gene family was analyzed. The MCMV genes m142 and m143 are the only members of this family that are essential for virus replication. These genes also differ from the remaining ten US22 gene family members in that they lack 1 of 4 conserved sequence motifs that are characteristic of this family. The same conserved motif is missing in the HCMV US22 family members TRS1 and IRS1, suggesting a possible functional homology. To demonstrate an essential role of m142 and m143, the genes were deleted from the MCMV genome, and the mutants were reconstituted on complementing cells. Infection of non-complementing cells with the deletion mutants did not result in virus replication. Virus growth was rescued by reinsertion of the corresponding genes. Cells infected with the viral deletion mutants synthesized reduced amounts of viral DNA, and viral late genes were not expressed. However, RNA analyses showed that late transcripts were present, excluding a role of m142 and m143 in regulation of gene transcription. Metabolic labelling experiments showed that total protein synthesis at late times postinfection was impaired in cells infected with deletion mutants. Moreover, the dsRNA-dependent protein kinase R (PKR) and its target protein, the translation initiation factor 2α (eIF2α) were phosphorylated in these cells. This suggested that the m142 and m143 are required for blocking the PKR-mediated shut-down of protein synthesis. Expression of the HCMV gene TRS1, a known inhibitor of PKR activation, rescued the replication of the deletion mutants, supporting the observation that m142 and m143 are required to inhibit this innate immune response of the host cell.
From the history of the Church, we gather that one of the most major tests that confronted the early Christian community was whether everyone who wanted to become a Christian also of necessity had to become a Jew as a pre-requisite for entrance into the new community of believers. The issue at stake is whether one qualifies to be a Christian through adherence to the Jewish identity, which centres on circumcision and the observance of the Mosaic legal code. The crisis resulted to the convocation of the Jerusalem Council (cf. Acts 15), which tasked itself with the definition of the Christian identity. The Council bases its definition of Christian identity, separable from adherence to the Jewish cultural practice (a form of cultural imperialism), solely on election by God in Jesus Christ. Moreover, the event of the Pentecost in Jerusalem demonstrated what the nature of the spreading of the message of this new community of believers in Jesus Christ should be: that people from other cultures, “Parthians, Medes and Elamites; people from Mesopotamia, Judaea and Capadocia, Ponthus and Asia, Phrygia and Pamphylis, Egypt and the parts of Libya around Cyrene; as well as visitors from Rome, Jews and Proselytes alike, Cretans and Arabs” (Acts 2: 9-11), could understand the message that Peter communicated to them through the force of the breath of the risen Jesus in their own mother tongue, without first becoming Jews. Against the background of this crucial point in the history of the early Church and in consideration of the Second Vatican Council, this dissertation seeks to address the problem of identity, unity and diversity in the Christian religion with special reference to Africa. It proposes that the traditional African Rites of Initiation that mark the transition from one stage of life to the other and therefore the existential and essential transformation of the individual and group offer with their rich symbolisms a very fertile ground for dialogue with the Christian religion. It views the various Rites of Initiation (from birth and ritual circumcision over puberty and adult to marriage and funeral rites) as vital and immutable seminal points in the life of the individual African and his/her society at large. These Rites that express in various ways the African holistic view and conception of life and reality are, in terms of their religious symbolism, meaning and function, analogous to their Christian counterparts (such as baptism, confirmation, Eucharist, ordination, marriage) and can as a result be conveniently accepted or at least incorporated even if in modified forms as authentic African initiation rites for African Christians. Without being syncretistic, such an incorporation and modification at one and the same time recognizes and respects the cultural identity of the African and marks his/her transformation and acceptance of his/her new identity, modelled on Christ. In this way, the African Christian will be enabled to live, articulate and express his/her faith within his/her own historical-cultural milieu. On the whole, the presentation is predictive and prescriptive with regard to what the relationship and dialogue between Christianity and the African Traditional Religion should be or should not be. It is an honest effort to make the Christian message relevant to the African in his/her own perceptual and conceptual world-view. This task remains a steady challenge to African Christians who want to maintain at one and the same time and at the same level their African identity and their Christian calling. The balancing and reconciling of these two identities in a correlating rather than confrontational manner remains a task for the Church of today and tomorrow. The dissertation is a foundational contribution to building up and sharpening consciousness for this problem.
As a traditional industrial pigment, perylene bisimide (PBI) dyes have found wide-spread applications. In addition, PBI dyes have been considered as versatile and promising functional materials for organic-based electronic and optic devices, such as transistors and solar cells. For these novel demands, the control of self-organization of this type of dye and the investigation of the relationship between the supramolecular structure and the relevant optical and electronic properties is of great importance. The objective of this thesis focuses on gaining a better understanding of structural and functional properties of pi-stacks based on self-assembling PBIs. Studies include the synthesis and characterization of new functional PBI dyes, their aggregation in solution, in liquid crystalline state and on surfaces, and their fluorescence and charge transport properties. An overview of the formation, thermodynamics and structures of pi-stacks of functional pi- conjugated molecules in solution and in liquid crystalline phases is given in Chapter 2. Chapters 3 and 4 deal with the pi-pi aggregates of new, highly fluorescent PBIs without core-substituents. In Chapter 3, the self-assembly of a PBI with tridodecylphenyl substituents at imide N atoms both in solution and condensed phase has been studied in great detail. In condensed state, the dye exhibits a hexagonal columnar liquid crystalline (LC) phase as confirmed by DSC, OPM and X-ray diffraction analysis. The columnar stacking of this dye has been further confirmed by atomic force microscopy (AFM) where single columns could be well resolved The charge transport properties this dye have been investigated by pulse radiolysis-time resolved microwave conductivity (PR-TRMC) measurements. To shed more light on the nature of the pi-pi interaction of the unsubstituted PBIs, solvent depend aggregation properties have been investigated in Chapter 4. The studies are further extended from core-unsubstituted PBIs to core-substituted ones (Chapter 5 and 6). In Chapter 5, a series of highly soluble and fluorescent core-twisted PBIs that bear the same trialkylphenyl groups at the imide positions but different bay-substituents and were synthesized. These compounds are characterized by distortions of the perylene planes with dihedral angles in the range of 15-37° according to crystallographic data and molecular modeling studies. In contrast to the extended oligomeric aggregates formed for planar unsubstituted PBIs, this family of dyes formed discrete pi-pi-stacked dimers in apolar methylcyclohexane as concentration-dependent UV/Vis measurements and VPO analysis revealed. The Gibbs free energy of dimerization can be correlated with the twist angles of the dyes linearly. In condensed state, several of these PBIs form luminescent rectangular or hexagonal columnar liquid crystalline phases with low isotropization temperatures. The core-twisting effect on semiconducting properties has been examined in Chapter 6. In this chapter, a comparative study of the electrochemical and the charge transport properties of a series of non-substituted and chlorine-functionalized PBIs was performed. While Chapters 3-6 focus on one-component dye systems, Chapter 7 explored the possibility of a supramolecular engineering of co-aggregates formed by hydrogen-bonded 2:1 and 1:1 complex of oligo(p-phenylene vinylene)s (OPVs) and PBIs. Covalently linked donor-acceptor dye arrays have been prepared for comparison. Concentration and temperature-dependent UV/Vis spectroscopy revealed all hydrogen-bonded and covalent systems form well-ordered J-type aggregates in methylcyclohexane. With these hydrogen-bonded OPV-PBI complexes, fibers containing p-type and n-type molecules can be prepared on the nano-scale (1-20 nm). For the 2:1 OPV-PBI hydrogenbonded arrays hierarchically assembled chiral superstructures consisting of left-handed helical pi-pi co-aggregates (CD spectroscopy) of the two dyes that further assemble into right-handed nanometer-scale supercoils in the solid state (AFM study) have been observed. All of these well-defined OPV-PBI assemblies presented here exhibit photoinduced electron transfer on sub-ps timescale, while the electron recombination differs for different systems.Thus, it was suggested that such assemblies of p- and n-type semiconductors might serve as valuable nanoscopic functional units for organic electronics.
In this work we utilized Density Functional Theory to calculate EPR parameters and spin-density distributions of several transition metal complexes. To demonstrate the performance of our theoretical approach several validation studies were performed (Chapters 3-5). In contrast, the last three chapters of the thesis deal with specific chemical problems regarding several classes of biologically relevant transition metal complexes.
Effects of desialyation on TCR-cross-linking and antigen sensitivity of CD8 positive T lymphocytes
(2005)
The featured experiments focus on changes in T cell membrane glycosylation as a possible means of controlling TCR cross-linking. Taking the long known fact that activated T cells show decreased levels of surface sialic acid as a starting point, differences in ligand binding and cellular reaction upon in vitro stimulation were investigated in naïve, activated and enzymatically desialyated CD8+, 2C TCR transgenic mouse lymphocytes. To detect differences in ligand binding lymphocytes were incubated with various concentrations of fluorescently labeled, soluble MHC/Ig fusion proteins until equilibrium was reached. Without previous washing, cells were analyzed by flow cytometry, determined MCF values were normalized to the plateau and fit to a mathematical model of equilibrium binding of divalent ligands to monomorphic receptors (Perelson 1984). Parameters derived from the model fit of binding data show, that neuraminidase treatment of T cells was sufficient to mimic a partially activated phenotype, showing enhanced TCR cross-linking. Enhanced TCR cross-linking was found to be dependent on the presence of CD8, as neuraminidase treatment of DN cells lead to decreased cross-linking. To elucidate the physiological relevance of desialyation induced increases in TCR cross-linking early tyrosine phosphorylation events and proliferative response upon in vitro stimulation of T cells were investigated. Both were found enhanced in neuraminidase treated cells, as compared to native cells. In conclusion the featured experiments suggest a role of surface sialic acid in controlling TCR cross-linking on naïve and activated T cells.
The aim of this study was to assess distribution patterns of articulate brachiopods during the Mesozoic. Exploratory and confirmatory multivariate analyses in this study evaluate whether environmental preferences of brachiopods and bivalves are substantially distinct and whether structure of their communities significantly differ. Specifically, the hypothesis being tested is that differential abundances of Mesozoic brachiopods and bivalves are not related to varying substrate properties only, but also to varying food supply, turbidity and oxygen levels. This hypothesis was evaluated with quantitative data gathered in various field areas and time intervals. They include the Upper Triassic deposits of the West Carpathians and Eastern Alps, the Lower and Middle Jurassic deposits of Morocco, the Middle and Upper Jurassic deposits of the West Carpathians, the Upper Jurassic deposits of the Franconian and Swabian Alb, and the Upper Jurassic deposits of the Swiss Jura. The main conclusion is that brachiopod-dominated communities are characterized by a unique guild structure, with dominance of trophic groups with low metabolic requirements or adapted to nutrient-poor or oxygen-poor conditions. For example, brachiopod co-occured more commonly with epifaunal than with infaunal bivalves in soft-bottom environments. Abundances of brachiopods correlate mostly negatively with increasing proportions of terrigenous admixture (i.e., with increasing amount of land-derived nutrient supply and turbidity).
Visualization of type I immunity using bicistronic IFN-gamma reporter mice in vitro and in vivo
(2006)
IFN-γ is the signature cytokine of Th1 and CD8+ effector cells generated in type I immune responses against pathogens, such as Influenza virus, Sendai virus and the intracellular protozoan parasite Toxoplasma gondii. Understanding the regulation of IFN-γ is critical for the manipulation of immune responses, prevention of immunopathology and for vaccine design. In the present thesis, IFN-γ expression by CD4+ and CD8+ T cells was characterized in detail and the requirement of IFN-γ receptor mediated functions for IFN-γ expression was assessed. Bicistronic IFN-γ-eYFP reporter mice, which allow direct identification and isolation of live IFN-γ expressing cells, were used to visualize IFN-γ expression in vitro and in vivo after infection with the afore mentioned pathogens. Expression of the IFN-γ-eYFP reporter by CD4+ and CD8+ T cells was broadly heterogeneous in vitro and in vivo after infection. Increased expression of the reporter correlated positively with the abundance of IFN-γ transcripts and IFN-γ protein production upon stimulation. eYFP reporter brightness reflected the potential for IFN-γ production, but actual secretion was largely dependent on antigenic stimulation. Increased expression of the reporter also correlated with enhanced secretion of additional proinflammatory cytokines and chemokines and cell surface expression of markers that indicate recent activation. Highly eYFP fluorescent cells were generally more differentiated and their anatomical distribution was restricted to certain tissues. The anatomical restriction depended on the pathogen. IFN-γ expressing CD4+ and CD8+ T cells were generated in IFN-γ receptor deficient reporter mice after infection with Sendai virus or Toxoplasma gondii. However, in the absence of IFN-γ receptor mediated functions, the frequency and brightness of the eYFP reporter expression was altered. Dual BM chimeric mice, reconstituted with wild-type and IFN-γ receptor deficient reporter BM, revealed a T cell-intrinsic requirement for the IFN-γ receptor for optimal IFN-γ expression. Reporter fluorescence intensities were regulated independently of IFN-γ receptor mediated functions. Finally, we propose a model for IFN-γ expression by CD4+ and CD8+ T cells. 2. SUMMARY 10 In summary, the expression of IFN-γ is differentially regulated in CD4+ and CD8+ T cells and after viral or protozoan infections. Additionally, the role of IFN-γ receptor mediated functions for the expression of IFN-γ was determined.
The theoretical work presented in this thesis is concerned with the highest possible oxidation states of the 5d transition metal row. Based on a validation study of several DFT functionals against accurate coupled-cluster CCSD(T) methods we will present calculations on a series of new high oxidation state HgIV species. Quantum-chemical calculations have also been applied to various fluoro complexes of gold in oxidation states +V through +VII to evaluate the previously claimed existence of AuF7. The calculations indicate clearly that the oxidation state (+V), e.g., in [AuF5]2, remains the highest well-established gold oxidation state. Further calculations on iridium in oxidation state (+VII) show that IrF7 and IrOF5 are viable synthetic targets, whereas higher oxidation states of iridium appear to be unlikely. Structures and stabilities of several osmium fluorides and oxyfluorides were also studied in this thesis. It is shown that homoleptic fluorides all the way up to OsF8 may exist. Combining the results of the most accurate quantum-chemical predictions of this thesis and of the most reliable experimental studies, we observe a revised trend of the highest oxidation states of the 5d transition metal row. From lanthanum (+III) to osmium (+VIII), there is a linear increase of the highest oxidation states with increasing atomic number. Thereafter, we observe a linear descent from osmium (+VIII) to mercury (+IV). We will also present a short outlook to the transition metals of the 3d and 4d row and their highest reachable oxidation states.