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The analysis of real data by means of statistical methods with the aid of a software package common in industry and administration usually is not an integral part of mathematics studies, but it will certainly be part of a future professional work. The present book links up elements from time series analysis with a selection of statistical procedures used in general practice including the statistical software package SAS Statistical Analysis System). Consequently this book addresses students of statistics as well as students of other branches such as economics, demography and engineering, where lectures on statistics belong to their academic training. But it is also intended for the practician who, beyond the use of statistical tools, is interested in their mathematical background. Numerous problems illustrate the applicability of the presented statistical procedures, where SAS gives the solutions. The programs used are explicitly listed and explained. No previous experience is expected neither in SAS nor in a special computer system so that a short training period is guaranteed. This book is meant for a two semester course (lecture, seminar or practical training) where the first two chapters can be dealt with in the first semester. They provide the principal components of the analysis of a time series in the time domain. Chapters 3, 4 and 5 deal with its analysis in the frequency domain and can be worked through in the second term. In order to understand the mathematical background some terms are useful such as convergence in distribution, stochastic convergence, maximum likelihood estimator as well as a basic knowledge of the test theory, so that work on the book can start after an introductory lecture on stochastics. Each chapter includes exercises. An exhaustive treatment is recommended. This book is consecutively subdivided in a statistical part and an SAS-specific part. For better clearness the SAS-specific part, including the diagrams generated with SAS, always starts with a computer symbol, representing the beginning of a session at the computer, and ends with a printer symbol for the end of this session. This book is an open source project under the GNU Free Documentation License.
Insights into the evolution of protein domains give rise to improvements of function prediction
(2005)
The growing number of uncharacterised sequences in public databases has turned the prediction of protein function into a challenging research field. Traditional annotation methods are often error-prone due to the small subset of proteins with experimentally verified function. Goal of this thesis was to analyse the function and evolution of protein domains in order to understand molecular processes in the cell. The focus was on signalling domains of little understood function, as well as on functional sites of protein domains in general. Glucosaminidases (GlcNAcases) represent key enzymes in signal transduction pathways. Together with glucosamine transferases, they serve as molecular switches, similar to kinases and phosphatases. Little was known about the molecular function and structure of the GlcNAcases. In this thesis, the GlcNAcases were identified as remote homologues of N-acetyltransferases. By comparing the homologous sequences, I was able to predict functional sites of the GlcNAcase family and to identify the GlcNAcases as the first family member of the acetyltransferase superfamily with a distinct catalytic mechanism, which is not involved in the transfer of acetyl groups. In a similar approach, the sensor domain of a plant hormone receptor was studied. I was able to predict putative ligand-binding sites by comparing evolutionary constraints in functionally diverged subfamilies. Most of the putative ligand-binding sites have been experimentally confirmed in the meantime. Due to the importance of enzymes involved in cellular signalling, it seems impossible to find substitutions of catalytic amino acids that turn them catalytically inactive. Nevertheless, by scanning catalytic positions of the protein tyrosine phosphatase families, I found many inactive domains among single domain and tandem domain phosphatases in metazoan proteomes. In addition, I found that inactive phosphatases are conserved throughout evolution, which led to the question about the function of these catalytically inactive phosphatase domains. An analysis of evolutionary site rates of amino acid substitutions revealed a cluster of conserved residues in the apparently redundant domain of tandem phosphatases. This putative regulatory center might be responsible for the experimentally verified dimerization of the active and inactive domain in order to control the catalytic activity of the active phosphatase domain. Moreover, I detected a subgroup of inactive phosphatases, which presumably functions in substrate recognition, based on different evolutionary site rates within the phosphatase family. The characterization of these new regulatory modules in the phosphatase family raised the question whether inactivation of enzymes is a more general evolutionary mechanism to enlarge signalling pathways and whether inactive domains are also found in other enzyme families. A large-scale analysis of substitutions at catalytic positions of enzymatic domains was performed in this work. I identified many domains with inactivating substitutions in various enzyme families. Signalling domains harbour a particular high occurrence of catalytically inactive domains indicating that these domains have evolved to modulate existing regulatory pathways. Furthermore, it was shown that inactivation of enzymes by single substitutions happened multiple times independently in evolution. The surprising variability of amino acids at catalytic positions was decisive for a subsequent analysis of the diversity of functional sites in general. Using functional residues extracted from structural complexes I could show that functional sites of protein domains do not only vary in their type of amino acid but also in their structural location within the domain. In the process of evolution, protein domains have arisen from duplication events and subsequently adapted to new binding partners and developed new functions, which is reflected in the high variability of functional sites. However, great differences exist between domain families. The analysis demonstrated that functional sites of nuclear domains are more conserved than functional sites of extracellular domains. Furthermore, the type of ligand influences the degree of conservation, for example ion binding sites are more conserved than peptide binding sites. The work presented in this thesis has led to the detection of functional sites in various protein domains involved in signalling pathways and it has resulted in insights into the molecular function of those domains. In addition, properties of functional sites of protein domains were revealed. This knowledge can be used in the future to improve the prediction of protein function and to identify functional sites of proteins.
Platelet activation and adhesion resulting in thrombus growth is essential for normal hemostasis, but can lead to irreversible, life-threatening vessel occlusion. In the current study, the contribution of platelet integrins, activation receptors and the contact system of blood coagulation in such pathological conditions was investigated in mice.
In this project two novel murine autoimmune models were to be established in an attempt to further investigate the nervous system disorders of Multiple Sclerosis and Guillain Barré Syndrome. Previous experimental autoimmune encephalomyelitis (EAE) and experimental autoimmune neuritis (EAN) models have demonstrated that T cells play a major role in these diseases. Which roles CD4 and CD8 T cells specifically have in the initiation, propagation and termination of an autoimmune nervous system disorder remains controversial. To this end two transgenic mice specifically expressing the neo-antigen (Ag) ovalbumin (OVA) in either the central nervous system (CNS) or peripheral nervous system (PNS) were to be generated. The myelin basic protein (MBP) is a major component of the myelin sheath both within the CNS and the PNS. Therefore the MBP promoter was employed for its distinct regulatory elements to facilitate exclusive CNS or PNS OVA expression. The adoptive transfer of OVA specific MHCI restricted (OT-I) and MHCII restricted (OT-II) TCR Tg T cells extended the OVA Tg mouse model by allowing potentially encephalitogenic T cells to be tracked in vivo. Specificity for the target Ag should enable the dynamic role of antigen specific T cells in neuroinflammatory diseases to be revealed in more detail.
A Lie algebraic generalization of the classical and the Sort-Jacobi algorithm for diagonalizing a symmetric matrix has been proposed. The coordinate free setting provides new insights in the nature of Jacobi-type methods and allows a unified treatment of several structured eigenvalue and singular value problems, including so far unstudied normal form problems. Local quadratic convergence has been shown for both types of Jacobi methods with a fully comprehension of the regular and irregular case. New sweep methods have been introduced that generalize the special cyclic sweep for symmetric matrices and ensure local quadratic convergence also for irregular elements. The new sweep methods yield faster convergence behavior than the previously known cyclic schemes.
The studies presented in this thesis deal with resonant and non-resonant excitation of free variable size clusters using synchrotron radiation in the soft X-ray regime. The post collision interaction (PCI) effect is investigated in free variable size krypton and argon clusters near the Kr 3d and Ar 2p ionization energies. The core ionization energies of surface and bulk sites in variable size clusters can be clearly distinguished. This is mostly due to the polarization screening. It is found that the asymmetry, which is a consequence of PCI, is characteristically smaller for clusters than for isolated atoms. Moreover, there is less asymmetry for bulk sites than for surface sites in variable size rare gas clusters. We assign the results in terms of mechanisms that are based on quantum mechanical models of post collision interaction. Complementary experiments on the photoionization of free van der Waals clusters are performed by using zero kinetic energy (ZEKE) photoelectron spectroscopy in the Ar 2p-, Kr 3d-, Ne 1s-, and N2-regimes. The experimental approach is also suitable to detect cluster size dependent changes in electronic structure. This also allows us to study post collision interaction in variable size clusters. The parameters of the PCI profiles deduced for ZEKE experiments indicate that there are no significant changes in core ionization dynamics compared to near-threshold experiments. Results from model calculations in Kr 3d ionization energy indicate that different geometric sites can be clearly distinguished from each other by their substantial shift in Kr 3d ionization energy, though the dimer shows almost the same Kr 3d ionization energy as the free atom. A comparison with the experimental results indicates that there is resemblance with the model calculations, even though close-lying ionization energies are blended and require deconvolutions of the experimental spectra. It is evident from the present work that one can observe distinct shifts in core ionization energies in van der Waals clusters that are formed in wide size distributions of a jet expansion. The emission of ultraviolet fluorescence radiation from variable size argon clusters is investigated with high spectral resolution in the Ar 2p-excitation regime. The fluorescence excitation spectra reveal strong fluorescence intensity in the Ar 2p-continuum, but no evidence for the occurrence of discrete low-lying core-exciton states in the near-edge regime. This finding is different from the absorption and photoionization cross sections of argon clusters and the solid. The dispersed fluorescence shows a broad molecular band centered near 280 nm. The present results are consistent with the formation of singly charged, excited moieties within the clusters, which are assigned as sources of the radiative relaxation in the 280 nm regime. A fast energy transfer process (interatomic Coulombic decay, ICD) is assigned to be primarily the origin of these singly charged, excited cations besides intra-cluster electron impact ionization by Auger electrons. Our findings give possibly the first experimental evidence for ICD in the core level regime. Free, variable size nitrogen clusters are investigated in the N 1s excitation regime in comparison with the free molecule and solid nitrogen. The conversion of Rydberg states into core excitons, surface and bulk, was studied. The experimental results are simulated by ab initio calculations using (N2)13 as a reasonable prototype cluster structure that allows us to simulate both surface and bulk properties in comparison with the isolated molecule. The present results clearly show that there are specific properties, such as molecular orientation, in molecular van der Waals clusters, which do not exist in atomic van der Waals clusters. It is shown that inner and outer surface sites give rise to distinct energy shifts of the low lying surface core excitons.
The geologic barrier represents the final contact between a landfill and the environment. Ideally suited are clays and mudstones because of sufficient vertical and lateral extent, low hydraulic conductivities and high sorptive characteristics. Since hydraulic conductivity is no longer the single criteria to determine transport and retardation of contaminants in geologic landfill barrier materials, diffusive and sorptive characteristics of 4 different clay and mudstone lithologies in Northern Bavaria, were investigated. Cored samples from various depths were included in this study and subjected to evaluations of geochemistry, mineralogy, physical parameters, sorption and diffusion. A transient double reservoir with decreasing source concentration was designed and constructed using clear polycarbonate cylinders for undisturbed clay plugs of 2 to 4cm thickness. Samples were also fitted with internal electrical conductivity probes to determine the migration of the diffusive front. A multi chemical species synthetic landfill leachate was contrived to simulate and evaluate natural pollutant conditions. A computational method for determining mineralogy from geochemical data was also developed. It was found that sorptive processes are mostly controlled by the quality and type of fine grained phyllosilicates and the individual chemical species involved exhibited linear, Freundlich, as well as Langmuir sorption properties. Effective diffusion and sorption coefficients were also determined using POLLUTEv6 (GAEA, 1997) software and receptor reservoir concentrations for K, Na, Ca, Cu, NH4, Cl, NO3, SO4, and concentration totals at predetermined time intervals. Anion exclusion proved to be a major factor in the diffusion process and was used to explain many observed anomalies. Furthermore, diffusion coefficients were found not to be static with a multi chemical species leachate, but actually varied during the course of the experiment. Strong indications point toward the major role of pore space quality, shape, and form as control of diffusive properties of a geologic barrier. A correlation of CECNa of the samples with De may point to a possible deduction of diffusive properties for multi species leachates without extensive and time consuming laboratory tests
We use algebraic closures and structures which are derived from these in complexity theory. We classify problems with Boolean circuits and Boolean constraints according to their complexity. We transfer algebraic structures to structural complexity. We use the generation problem to classify important complexity classes.
The one electron oxidation potential of ten TAAs with all permutations of Cl , OMe- and Me-substituents in the three p-positions were determined by CV. The half wave potential of the first oxidation wave correlates linearly with the number of Cl- and OMe-substituents. AM1-CISD derived values of the absorption energies are in good agreement with the experiments but differ strongly for the oscillator strengths as well as for neutral compounds and their corresponding mono radical cations. The small solvent dependence of the experimental UV/Vis spectra in CH2Cl2 and MeCN reflects a minor charge transfer character of the electronic transitions. The UV/Vis/NIR spectra of the series of TAAs and their corresponding radical cations and the AM1 computations reveal that even small substituents may lead to strong symmetry breaking and to a modified electronic structure. The spectroscopic properties of a series of four bis-TAA donor-bridge-donor X-B-X dimers, composed of two asymmetric TAA chromophores (monomers) were investigated. UV/vis-, fluorescence and transient absorption spectra were recorded and compared with those of the corresponding X-B monomers. The excited states of the dimers are described as MV states which show, depending on the chemical nature of the bridge, a varying amount of interactions. It was found that superradiant emission only proceeds in the case of weak and medium coupling. Whether the first excited state potential energy surface of the dimers is a single minimum or a double minimum potential depends on the solvent polarity and the electronic coupling. In the latter case, the dimer relaxes in a symmetry broken CT state. The [2.2]paracyclophane bridged dimer is an example for a weakly coupled system, because the spectroscopic behavior is very similar to the corresponding p xylene monomer. In contrast, anthracene as well as p-xylene bridges mediate a stronger coupling and reveal a significant cooperative influence on the optical properties. A series of [2.2]paracylophane bridged bis-TAA MV radical cations X-B-X+ were analyzed by a GMH three-level model which takes two transitions into account: the IV-CT band and the bridge band. From the GMH analysis, one can conclude that the [2.2]paracyclophane moiety is not the limiting factor which governs the intramolecular charge transfer. The electronic interactions are of course smaller than direct conjugation but from the order of magnitude of the couplings of the [2.2]paracyclophane MV species it can be assumed that this bridge is able to mediate significant through-space and through-bond interactions. From the exponential dependence of the electronic coupling V between the two TAA localized states on the distance r between the two redox centers, it was inferred that the HT proceeds via superexchange mechanism. The analysis reveals that even significantly longer conjugated bridges should still mediate significant electronic interactions, because the decay constant of a series of conjugated MV species is small. The absorption properties of a series of bis-TAA-[2.2]paracyclophane dications X+-B-X+ were presented. The localized and the CT transitions of these dications are explained and analyzed by an exciton coupling model which also considers the photophysical properties of the monomeric TAA radical cations. Together with AM1-CISD calculated transition moments, experimental transition moments and transition energies of the bis-TAA dications were used to calculate electronic couplings by a GMH approach. These couplings are a measure for interactions of the excited MV CT states. The modification of the diabatic states reveals similarities of the GMH three-level model and the exciton coupling model. Comparison of the two models shows that the transition moment between the excited mixed-valence states of the dimer equals the dipole moment difference of the ground and the excited bridge state of the corresponding monomer. Thianthrenophane (1) has a cavity which offers enough room to potentially enable endohedral coordination to small ions or molecules. For the complexation of silver(I) perchlorate, the complex stability constants of thianthrenophane logK1=5.45 and of thianthrene logK2=9.16 were determined by UV/Vis titration. Single competition transport experiments with ten metal salts demonstrate a very high selectivity of thianthrenophane as a carrier for silver(I) and a distinctly higher transport rate compared to carriers such as thianthrene and 14-ane-S4. Although the X-ray crystal structure analysis of the polymeric [Ag(1)]ClO4 shows an exohedral coordination to silver(I), the formation of an endohedral [Ag(1)]+ complex is suggested to be the explanation for the unusual carrier selectivity of silver(I) by 1 in bulk liquid membrane.
In this work the influence of “active” bridge units on the electron transfer (ET) mechanism within organic donor-bridge-electrode arrays in self-assembled monolayers (SAMs) was studied by spectroscopic and electrochemical methods. In the first part of this work ferrocenealkanethiols 1 – 3 and the ferrocenearylthiols 4, 5 were investigated to get experience in the monolayer preparation for measuring ET rates. Cyclic voltammetry of the monolayers indicates that homogeneously mixed monolayers containing redox active molecules and dummy molecules were formed. For the known ferrocenealkanethiols 1 – 3 the ET rates could be confirmed compared to the ones measured by Creager et al. [206]. As expected the ET rate decreases by increasing chain length of the alkane spacer from 2 to 3. Changing the bonding between the redox centre and the alkane spacer with the same bridge lenght, e. g. by using a carboxy-group in case of 1, does not influence the ET behaviour very strong. The aromatic ferrocenethiols 4 and 5 show very high ET rates due to the strong conjugated system although the distance between the redox centre and the electrode is comparable to the C8-alkyl compound 2. The electronic coupling factors all indicate a nonadiabatic ET between the redox centre and the electrode. As expected the electronic coupling factors increase with decreasing spacer length or with an enlarged conjugated system. To sum up, experience in monolayer preparation could be obtained, the measured ET rates for well known ferrocenealkane-compounds 1 - 3 could be verified and the information could be transferred to the conjugated systems 4 and 5. In the second part the triarylamine- 29, 32 and the phenothiazinealkanethiol 35 have been examined relative to their ET behaviour in mixed monolayers. The cyclic voltammograms of the diluted monolayers indicate that homogeneously formed monolayers are present. The ET rates of triarylamine- 29, 32 and phenothiazinealkanethiols 35 are 10 to 100 times higher than compared to ferrocenealkanethiols with equal chain length[183, 206], whereas in a [Ru(bpy)2(pp)]+-containing monolayer the same value was observed [177]. Almost two parameters influence the ET rate constant: the electronic coupling matrix element and the reorganisation energy  [209]. The ET rate in donor substituted alkanethiols is mainly influenced by the reorganisation energy  [177] and even small changes have a dramatic effect on the observed processes, therefore an increasing ET rate from the ferrocene (high reorganisation energy) over the phenothiazine 35 and the [Ru(bpy)2(pp)]+ to the triarylamine chromophores 29 and 32 (low reorganisation energy) is observed. Furthermore the bonding between the redox centres and the alkane spacer plays an important role on the ET rate in case of the triarylamines 29 and 32 opposite to the assumption made by Creager et al. that the connection does not play any role. For the electron rich ether connected compound 29 the ET is not only dominated by the reorganisation energy but also by mesomeric effects where the positive charge of the electron rich derivative 29 is more located at the ether function so that the chain is formally shortend by one atom resulting in higher ET rates than compared to 32. In the third part of the thesis a series of “molecular wires” consisting of methoxy- or chloro-substituted triarylamines and phenothiazines with different bridge units and bridge length between the redox centre and the anchor thiol function have been prepared in order to investigate their ET-behaviour. Cyclic voltammetry and UV/vis-spectroscopy show that the oxidation potential and the energetic states could be controlled very well by introducing different redox centres and bridge units resulting in a decreasing oxidation potential of the redox centres and a bathochromic shift of the absorption bands in the UV/vis-spectra. Also the densitiy of the chromophores in mixed monolayers could be controlled very well for only three compounds (49, 52 and 87) with nitrile-substituted bridges reliable ET rates could be obtained. In these chromophores the ET rate decreases by increasing the density of the redox active molecules in the mixed monolayers indicating that the adsorption geometry changes with coverage with the chromophores tilting to a more upright orientation as the surface becomes more crowded. For all other compounds the measurements were limited by the fast ET rates. Conformational, as well as a very weak distance dependence of the ET resulting in very high ET rates [172] or unfavourable HOMO-LUMO energies of the donor, bridge and the electrode are reasons for this behaviour. The fact that compound 49 shows almost the same rate constant independent of the length (n = 2 or n = 3) may indicate that a hopping process is operating for which a much weaker length dependence is expected than in the case of a superexchange.
Diese Arbeit enthält Untersuchungen von Magnetowiderstandseffekten in (Ga,Mn)As basierten ferromagnetischen Halbleiterdioden. Die Resultate wurden in den folgenden Artikeln veröffentlicht: [1] C. Rüster, T. Borzenko, C. Gould, G. Schmidt, L.W. Molenkamp, X. Liu, T.J.Wojtowicz, J.K. Furdyna, Z.G. Yu and M. Flatt´e, Very Large Magnetoresistance in Lateral Ferromagnetic (Ga,Mn)As Wires with Nanoconstrictions, Physical Review Letters 91, 216602 (2003). [2] C. Gould, C. Rüster, T. Jungwirth, E. Girgis, G.M. Schott, R. Giraud, K. Brunner, G. Schmidt and L.W. Molenkamp, Tunneling Anisotropic Magnetoresistance: A Spin-Valve-Like Tunnel Magnetoresistance Using a Single Magnetic Layer, Physical Review Letters 93, 117203 (2004). [3] C. Rüster, C. Gould, T. Jungwirth, J. Sinova, G.M. Schott, R. Giraud, K. Brunner, G. Schmidt and L.W. Molenkamp, Very Large Tunneling Anisotropic Magnetoresistance of a (Ga,Mn)As/GaAs/(Ga,Mn)As Stack, Physical Review Letters 94, 027203 (2005). [4] C. Rüster and C. Gould, T. Jungwirth, E. Girgis, G.M. Schott, R. Giraud, K. Brunner, G. Schmidt and L.W. Molenkamp, Tunneling anisotropic magnetoresistance: Creating a spin-valve-like signal using a single ferromagnetic semiconductor layer, Journal of Applied Physics 97, 10C506 (2005).
The vertebrate spinal cord is composed of billions of neurons and glia cells, which are formed in a highly coordinated manner during early neurogenesis. Specification of these cells at distinct positions along the dorsoventral (DV) axis of the developing spinal cord is controlled by a ventrally located signaling center, the medial floor plate (MFP). Currently, the origin and time frame of specification of this important organizer are not clear. During my PhD thesis, I have analyzed the function of the novel secreted growth factor Midkine-a (Mdka) in zebrafish. In higher vertebrates, mdk and the related factor pleiotrophin (ptn) are widely expressed during embryogenesis and are implicated in a variety of processes. The in-vivo function of both factors, however, is unclear, as knock-out mice show no embryonic phenotype. We have isolated two mdk co-orthologs, mdka and mdkb, and one single ptn gene in zebrafish. Molecular phylogenetic analyses have shown that these genes evolved after two large gene block duplications. In contrast to higher vertebrates, zebrafish mdk and ptn genes have undergone functional divergence, resulting in mostly non-redundant expression patterns and functions. I have shown by overexpression and knock-down analyses that Mdka is required for MFP formation during zebrafish neurulation. Unlike the previously known MFP inducing factors, mdka is not expressed within the embryonic shield or tailbud but is dynamically expressed in the paraxial mesoderm. I used epistatic and mutant analyses to show that Mdka acts independently from these factors. This indicates a novel mechanism of Mdka dependent MFP formation during zebrafish neurulation. To get insight into the signaling properties of zebrafish Mdka, the function of both Mdk proteins and the candidate receptor Anaplastic lymphoma kinase (Alk) have been compared. Knock-down of mdka and mdkb resulted in the same reduction of iridophores as in mutants deficient for Alk. This indicates that Alk could be a putative receptor of Mdks during zebrafish embryogenesis. In most vertebrate species a lateral floor plate (LFP) domain adjacent to the MFP has been defined. In higher vertebrates it has been shown that the LFP is located within the p3 domain, which forms V3 interneurons. It is unclear, how different cell types in this domain are organized during early embryogenesis. I have analyzed a novel homeobox gene in zebrafish, nkx2.2b, which is exclusively expressed in the LFP. Overexpression, mutant and inhibitor analyses showed that nkx2.2b is activated by Sonic hedgehog (Shh), but repressed by retinoids and the motoneuron-inducing factor Islet-1 (Isl1). I could show that in zebrafish LFP and p3 neuronal cells are located at the same level along the DV axis, but alternate along the anteroposterior (AP) axis. Moreover, these two different cell populations require different levels of HH signaling and nkx2.2 activities. This provides new insights into the structure of the vertebrate spinal cord and suggests a novel mechanism of neural patterning.
The biotransformation of 1,1,1,3,3-pentafluoropropane was investigated in rats and in in vitro systems. First, the metabolites were identified in vivo using GC/MS and 19F NMR analysis. The main metabolite was identified as trifluoroacetic acid, the minor metabolite as 3,3,3-trifluoropropionic acid and as a cleavage product, inorganic fluoride was found. As the in vitro system, liver microsomes from rat and human samples and rat liver homogenates were used. Trifluoroacetic acid and 3,3,3 trifluoropropionic acid were confirmed in vitro as metabolic intermediates, following biotransformation of 1,1,1,3,3-pentafluoropropane by the cytochrome P-450-system. Studies, designed for clarifying the cardiotoxicity of 1,1,1,3,3-pentafluoropropane were driven by the hypothesis that 3,3,3-trifluoropropionic acid is the toxic agent. This was based on the lethal toxicity, which was observed in previous in vivo experiments. In addition, the point of its structural similarity to toxic agents as for example monofluoroacetic acid or of possible metabolic intermediates like difluoroacrylic acid with known toxicity were considered to support this assumption. However, trifluoroacetic acid was neglected as the sought-after toxic agent because of its different toxic effects, known from literature. Investigations on the biotransformation of 3,3,3-trifluoropropionic acid were performed and resulted in no metabolic activity and in poor elimination of 3,3,3-trifluoropropionic acid in vivo. The histopathological effects on the heart, which were observed in the 90-day oral toxicity study of 1,1,1,3,3-pentafluoropropane in rats, namely mononuclear inflammatory cell infiltrations and degenerated myocardial fibers, were not observed after a 28 day repeated exposure of up to 10 mg/kg b.w. of 3,3,3-trifluoropropionic acid. However, a single high dose of 3,3,3-trifluoropropionic acid lead to severe toxicological effects. The difference in the observed toxic effects after a single and repeated administration may be due to adaptive mechanisms in rats. The toxicological effects included clinical signs like ataxia, coma and cramps. The conditions of the rats suggested possible inhibition of the energy supply to the organism. Furthermore, the interference of 3,3,3-trifluoropropionic acid in the functionality of the organism was investigated. Experiments were performed in vitro in rat liver and heart mitochondria to investigate effects on the mitochondrial ß-oxidation. However, the transformation of the substrate [U14C] palmitic acid in the ß oxidation pathway was not inhibited by 3,3,3-trifluoropropionic acid. In addition, no cytotoxicity of 3,3,3 trifluoropropionic acid was observed in the cell culture systems. The main effect after a single dose of 3,3,3-trifluoropropionic acid was seen in clinical pathology and metabonomic analysis. The decrease in blood glucose is considered to have the most far-reaching consequences for the toxicity of 3,3,3-trifluoropropionic acid. If considering this change as the primary effect after a single dose, secondary effects, for example, the above-mentioned clinical signs could be explained. In addition, the observed high level of ketone bodies might have been responsible for life-threatening possible ketoacidosis. In general, ketoacidosis occurs after an imbalance between glycolysis, lipolysis, TCA cycle activity and respiratory function. Based on the results, ß-oxidation of fatty acids was not affected, and due to the decrease in glucose levels and the high levels of acetyl CoA, glycolysis was considered not to be impaired. Increased amounts of acetyl CoA might be a result of insufficient activity of the TCA cycle. However, the inhibition of the TCA cycle can be based on the impairment of specific enzymes and/or on the involvement of messenger substrates like insulin. Supporting the first mentioned aspect are decreased levels of TCA cycle intermediates, like α-ketoglutarate or citrate, as seen in 1H-NMR spectra of urine. However, the second aspect would explain the drop in blood glucose with the impairment of glucose transporters or the impairment of the insulin balance. If a single dose of 3,3,3-trifluoropropionic acid had stimulated the insulin release, glycolysis would be activated, and high amounts of acetyl CoA would be produced. In case of impaired use by the TCA cycle, levels of ketone bodies would be increased. Experiments were designed to characterize the direct effect of 3,3,3-trifluoropropionic acid on rat insulinoma-derived INS-1 cells as possible increase in insulin release. Further investigations are necessary to answer in which step of the metabolic pathway 3,3,3-trifluoropropionic acid interferes or finally which specific enzyme is inhibited or activated by 3,3,3-trifluoropropionic acid, leading to the drop in blood glucose and finally in lethal toxicity.
Flagellar motility and chemotaxis are essential virulence traits required for the ability of Helicobacter pylori to colonize the gastric mucosa. The flagellar regulatory network and the complex chemotaxis system of H. pylori are fundamentally different from other bacteria, despite many similarities. In H. pylori expression of the flagella is controlled by a complex regulatory cascade involving the two-component system FlgR-HP244, the sigma factors 54 and 28 and the anti-sigma 28 factor FlgM. Thus far, the input signal for histidine kinase HP244, which activates the transcriptional regulator FlgR, which triggers sigma factor 54-dependent transcription of the flagellar class 2 genes, is not known. Based on a yeast two-hybrid screen a highly significant protein-protein interaction between the H. pylori protein HP137 and both the histidine kinase HP244 and the flagellar hook protein HP908 (FlgE´) has been reported recently (Rain et al., 2001). So far, no function could be assigned to HP137. Interestingly, the interaction between HP137 and histidine kinase HP244 was observed in the characteristic block N sequence motif of the C-terminal ATP-binding kinase domain. In this work a potential role of HP137 in a feedback regulatory mechanism controlling the activity of histidine kinase HP244 in the flagellar regulation of H. pylori was investigated. Although the substitution of the gene encoding HP137 by a kanamycin cassette resulted in non-motile bacteria, the failure to restore motility by the reintroduction of hp137 in cis into the mutant strain, and the observation that HP137 has no significant effect on the activity of histidine kinase HP244 in vitro indicated that HP137 is not directly involved in flagellar regulation. Therefore, it was demonstrated that HP137 does not participate in the regulation of flagellar gene expression, neither in H. pylori nor in the closely related bacterium C. jejuni. Chemotactic signal transduction in H. pylori differs from the enterobacterial paradigm in several respects. In addition to a CheY response regulator protein (CheY1) H. pylori contains a CheY-like receiver domain (CheY2) which is C-terminally fused to the histidine kinase CheA. Furthermore, the genome of H. pylori encodes three CheV proteins consisting of an N-terminal CheW-like domain and a C-terminal receiver domain, while there are no orthologues of the chemotaxis genes cheB, cheR, and cheZ. To obtain insight into the mechanism controlling the chemotactic response of H. pylori the phosphotransfer reactions between the purified two-component signalling modules were investigated in vitro. Using in vitro phosphorylation assays it was shown that both H. pylori histidine kinases CheAY2 and CheA´ lacking the CheY-like domain (CheY2) act as ATP-dependent autokinases. Similar to other CheA proteins CheA´ shows a kinetic of phosphorylation represented by an exponential time course, while the kinetics of phosphorylation of CheAY2 is characterized by a short exponential time course followed by the hydrolysis of CheAY2~P. Therefore, it was demonstrated that the presence of the CheY2-like receiver domain influences the stability of the phosphorylated P1 domain of the CheA part of the bifunctional protein. Furthermore, it was proven that both CheY1 and CheY2 are phosphorylated by CheAY2 and CheA´~P and that the three CheV proteins mediate the dephosphorylation of CheA´~P, although with a clearly reduced efficiency as compared to CheY1 and CheY2. Moreover, CheA´ is capable of donating its phospho group to the CheY1 protein from C. jejuni and to CheY protein from E. coli. Retrophosphorylation experiments indicated that CheY1~P is able to transfer the phosphate group back to the HK CheAY2 and the receiver domain present in the bifunctional CheAY2 protein acts as a phosphate sink fine tuning the activity of the freely diffusible CheY1 protein, which is thought to interact with the flagellar motor. Hence, in this work evidence of a complex phosphorelay in the chemotaxis system was obtained which has similarities to other systems with multiple CheY proteins. The role of the CheV proteins remain unclear at the moment, but they might be engaged in a further fine regulation of the phosphate flow in this complex chemotaxis system and the independent function of the two domains CheA´ and CheY2 is not sufficient for normal chemotactic signalling in vivo.
In the experiments presented in this work, linear and non-linear femtosecond time-resolved spectrsocopy were applied to investigate the structure-function and functiondynamics relationship in biological and artificially designed systems. The experiments presented in this work utilize femtosecond time-resolved transient absorption and transient grating as well as picosecond time-resolved fluorescence spectroscopy to investigate the photophysics and photochemistry of biological photoreceptors and address the light-induced excited-state processes in a particular molecular device that serves as a - structurally - very simple light-harvesting antenna and potentially as a catalysis-switch for the production of hydrogen in solution. The combination of white-light probe transient absorption and coherent transient grating spectroscopies yields spectral information about the excited state absorption in concert with high quality, high signal-to-noise kinetic transients, which allow for precise fitting and therefore very accurate time-constants to be extracted from the data. The use of femtosecond time-resolved transient grating spectroscopy is relatively uncommon in addressing questions concerning the excited-state reaction pathways of complex (biological) systems, and therefore the experiments presented in this work constitute according to the literature the first studies applying this technique to a a metalloporphyrin and an artificial light-harvesting antenna.
Although spintronics has aroused increasing interest, much fundamental research has to be done. One important issue is the control over the electronic spin. Therefore, spin and phase coherent transport are very important phenomena. This thesis describes experiments with mercury based quantum well structures. This narrow gap material provides a very good template to study spin related effects. It exhibits large Zeeman spin splitting and Rashba spin-orbit splitting. The latter is at least four to five times larger than in III-V semiconductors. Initially a short review on the transport theory was presented. The main focus as on quantisation effects that are important to understand the related experiments. Thus, Shubnikov-de Haas and the quantum Hall effect have been analysed. Due to the first fabrication of nanostructures on Hg-based quantum well samples, the observation of ballistic transport effects could be expected. Hence, the Landauer-B¨uttiker theory has been introduced which gives the theoretical background to understand such effects. With respect to the main topic of this thesis, phase coherence has been introduced in detail. Experiments, where coherence effects could be observed, have been explained theoretically. Here, possible measurement setups have been discussed, e.g., a ring shaped structure to investigate the Aharonov-Bohm and related effects. Due to the fact, that all experiments, described in this thesis, were performed on Hg-based samples, the exceptional position of such samples among the “classical” semiconductors has been clarified. Hg1-xMnx Te quantum wells are type-III QWs in contrast to the type-I QWs formed by e.g., GaAs/AlGaAs heterostructures. With a well width of more than 6 nm and a manganese content of less than 7% they exhibit an inverted band alignment. Band structure calculations based on self consistent Hartree calculations have been presented. The common description of a diluted magnetic semiconductor with the Brillouin function has been introduced and the experiments to obtain the empiric parameters T0 and S0 have been presented. Rashba spin-orbit splitting and giant Zeeman splitting have been explained theoretically and the magnetic ordering of a spin glass as well as the relevant interactions therein have been discussed. The next chapter describes the first realisation of nanostructures on Hg-based heterostructures. Several material specific problems have been solved, but the unique features of this material system mentioned above justify the effort. Interesting new insight could be found and will be found with these structures. Onto a series of QW samples, cross-shaped structures with several lead widths have been patterned. With the non-local resistance measurement setup, evidence for quasiballistic transport was demonstrated in cross-shaped structures with lead widths down to 0.45 mm. The non-local bend resistance and a regime of rebound trajectories as well as the anomalous Hall effect could be identified. Monte-Carlo simulations of the classical electron trajectories have been performed. A good agreement with the experimental data has been achieved by taking a random scattering process into account. Encouraged by this success the technology has been improved and ring-shaped structures with radii down to 1 mm have been fabricated. Low temperature (below 100 mK), four terminal resistance measurements exhibit clear Aharonov-Bohm oscillations. The period of the oscillations agrees very well with a calculation that takes only the sample geometry into account. One goal using such a structure is the experimental prove of the spin-orbit Berry phase. Therefore an additional Shottky gate on top of the ring was needed. With this structure evidence for the Aharonov-Casher effect was observed. Here, a perpendicular applied electric field causes analogous oscillations as does the magnetic field in the AB effect. A subsequent change in the Rashba SO splitting due to several applied gate voltages while measuring the AB effect should reveal the SO Berry phase. Although initially evidence of a phase change was detected, a clear proof for the direct measurement of the SO Berry phase could not be found. In the future, with an advanced sample structure, e.g., with an additional Hall bar next to the ring, which permits a synchronous measurement of the Rashba splitting, it might be possible to measure the SO Berry phase directly. In manganese doped HgTe QWs two different effects simultaneously cause spin splitting: the giant Zeeman and the Rashba effect. By analysing the Shubnikovde Haas oscillations and the node positions of their beating pattern, it has been possible to separate these two effects. Whereas the Rashba effect can be identified by its dependence on the structure inversion asymmetry, varied by the applied gate voltage, the giant Zeeman splitting is extracted from its strong temperature dependence, because Rashba splitting is temperature independent. The analysis revealed, that the Rashba splitting is larger than or comparable to the giant Zeeman splitting even at moderately high magnetic fields. In an extraordinary HgMnTe QW sample, that exhibits the n= 1 quantum Hall plateau from less than 1 T up to 28 T, the anomalous Hall effect could be excluded. Intense studies on the temperature dependence of the QHE as well as band structure calculations have revealed this extraordinary behaviour to be an ordinary band structure effect of this system. In a series of mesoscopic structures on nonmagnetic and magnetic QWs, an investigation of the universal conductance uctuations have been carried out. In the
It has been known for a long time that Drosophila can learn to discriminate not only between different odorants but also between different concentrations of the same odor. Olfactory associative learning has been described as a pairing between odorant and electric shock and since then, most of the experiments conducted in this respect have largely neglected the dual properties of odors: quality and intensity. For odorant-coupled short-term memory, a biochemical model has been proposed that mainly relies on the known cAMP signaling pathway. Mushroom bodies (MB) have been shown to be necessary and sufficient for this type of memory, and the MB-model of odor learning and short-term memory was established. Yet, theoretically, based on the MB-model, flies should not be able to learn concentrations if trained to the lower of the two concentrations in the test. In this thesis, I investigate the role of concentration-dependent learning, establishment of a concentration-dependent memory and their correlation to the standard two-odor learning as described by the MB-model. In order to highlight the difference between learning of quality and learning of intensity of the same odor I have tried to characterize the nature of the stimulus that is actually learned by the flies, leading to the conclusion that during the training flies learn all possible cues that are presented at the time. The type of the following test seems to govern the usage of the information available. This revealed a distinction between what flies learned and what is actually measured. Furthermore, I have shown that learning of concentration is associative and that it is symmetrical between high and low concentrations. I have also shown how the subjective quality perception of an odor changes with changing intensity, suggesting that one odor can have more than one scent. There is no proof that flies perceive a range of concentrations of one odorant as one (odor) quality. Flies display a certain level of concentration invariance that is limited and related to the particular concentration. Learning of concentration is relevant only to a limited range of concentrations within the boundaries of concentration invariance. Moreover, under certain conditions, two chemically distinct odorants could smell sufficiently similarly such, that they can be generalized between each other like if they would be of the same quality. Therefore, the abilities of the fly to identify the difference in quality or in intensity of the stimuli need to be distinguished. The way how the stimulus is analyzed and processed speaks in favor of a concept postulating the existence of two separated memories. To follow this concept, I have proposed a new form of memory called odor intensity memory (OIM), characterized it and compared it to other olfactory memories. OIM is independent of some members of the known cAMP signaling pathway and very likely forms the rutabaga-independent component of the standard two-odor memory. The rutabaga-dependent odor memory requires qualitatively different olfactory stimuli. OIM is revealed within the limits of concentration invariance where the memory test gives only sub-optimal performance for the concentration differences but discrimination of odor quality is not possible at all. Based on the available experimental tools, OIM seems to require the mushroom bodies the same as odor-quality memory but its properties are different. Flies can memorize the quality of several odorants at a given time but a newly formed memory of one odor interferes with the OIM stored before. In addition, the OIM lasts only 1 to 3 hours - much shorter than the odor-quality memory.
Emery-Dreifuss muscular dystrophy (EDMD) is a rare genetic disorder characterised by early contractures of the elbows, Achilles tendons and spine, slowly progressive muscle wasting and cardiomyopathy associated with cardiac conduction defect. The autosomal dominant form is caused by mutations in the LMNA gene which gives rise to lamin A and lamin C proteins by alternative splicing. These A-type lamins, together with B-type lamins, form the nuclear lamina, a network of intermediate filament proteins underlining the nuclear envelope. In order to ascertain the role lamin A and C separately contribute to the molecular phenotype, we analysed ten LMNA mutations and one single nucleotide polymorphism (SNP) in transfection studies in COS7 fibroblasts and, partially, in C2C12 myoblasts. The EGFP or DsRed2 tagged lamins were exogenously expressed either individually or both A-types together and examined by light and electron microscopy. The protein mobility of lamin A mutants was determined by FRAP analysis. Additionally, a co-immunoprecipitation binding assay of in vitro synthesised A-type lamins and emerin was performed.Eight of the LMNA mutations (R50S, R133P, E358K, E358K+C<T1698, E361K, R527P, L530P, R541S and G602S) and the SNP C<T1698, when expressed in lamin A, exhibited a range of nuclear mis-localisation patterns from a wild type phenotype to the formation of nuclear aggregates. Two mutations (T150P and delQ355) led to the severe mis-localisation of the exogenous protein and additionally affected nuclear envelope reassembly and mid-body protein composition after mitosis. Exogenously expressed DsRed2 tagged wild type and mutant lamin C was only inserted into the nuclear lamina if co-expressed with the equivalent EGFP tagged lamin A construct, except for the T150P mutation which prevented either lamin from reaching the nuclear lamina. The T150P, R527P and L530P mutations reduced the ability of lamin A, but not lamin C from binding to emerin. These data indicate that mutations in the rod domain of lamin A mainly impair its function as a structural protein, whereas mutations of the globular tail domain appear to disrupt protein-protein interactions important for gene regulation and signal transduction processes. In addition, our results suggest specific functional roles for the emerin-lamin A and emerin-lamin C containing protein complexes; this is the first report to propose that the A-type lamin mutations may be differentially dysfunctional for the same LMNA mutation.
In this thesis, I introduce the Virtual Brain Protocol, which facilitates applications of the Standard Brain of Drosophila melanogaster. By providing reliable and extensible tools for the handling of neuroanatomical data, this protocol simplifies and organizes the recurring tasks involved in these applications. It is demonstrated that this protocol can also be used to generate average brains, i.e. to combine recordings of several brains with the same features such that the common features are emphasized. One of the most important steps of the Virtual Insect Protocol is the aligning of newly recorded data sets with the Standard Brain. After presenting methods commonly applied in a biological or medical context to align two different recordings, it is evaluated to what extent this alignment can be automated. To that end, existing Image Processing techniques are assessed. I demonstrate that these techniques do not satisfy the requirements needed to guarantee sensible alignments between two brains. Then, I analyze what needs to be taken into account in order to formulate an algorithm which satisfies the needs of the protocol. In the last chapter, I derive such an algorithm using methods from Information Theory, which bases the technique on a solid mathematical foundation. I show how Bayesian Inference can be applied to enhance the results further. It is demonstrated that this approach yields good results on very noisy images, detecting apparent boundaries between structures. The same approach can be extended to take additional knowledge into account, e.g. the relative position of the anatomical structures and their shape. It is shown how this extension can be utilized to segment a newly recorded brain automatically.
Diese Arbeit wurde durch Experimente zur Potential- und Stromverteilung in Quanten-Hall- Systemen motiviert, die in den letzten Jahren in der Abteilung von Klitzing am MPI für Festkörperforschung durchgeführt wurden und ergaben, dass elektrostatische Abschirmungseffekte in zweidimensionalen Elektronensystemen (2DES), die den ganzzahligen Quanten-Hall-Effekt (QHE) zeigen, sehr wichtig für das Verständnis der Stromverteilung innerhalb der Probe und der extremen Genauigkeit der gemessenen quantisierten Werte des Hall-Widerstands sind. Daraus ergab sich für die hier vorgelegte Arbeit das folgende Programm. Zunächst wird, nach einem einleitenden Kapitel, in Kapitel 2 der Formalismus vorgestellt, mit dem in den späteren Kapiteln Elektronendichten und elektrostatische Potentiale, die z.B. das 2DES auf eine Probe mit Streifengeometrie eingrenzen, selbstkonsistent berechnet werden. Diese Selbstkonsistenz besteht aus zwei Teilen. Erstens wird, bei vorgegebenem Potential, die Elektronendichte berechnet. Zweitens wird aus vorgegebener Ladungsverteilung, bestehend aus (positiven) Hintergrundladungen und der (im ersten Schritt berechneten) Elektronenladungsdichte, und geeigneten Randbedingungen (konstantes Potential auf metallischen Gates) durch Lösen der Poisson-Gleichung das elektrostatische Potential berechnet. Wenn wir im ersten Schritt, unter Berücksichtigung der Fermi-Dirac-Statistik, die Elektronendichte quantenmechanisch aus den Energieeigenfunktionen und -werten berechnen, erhalten wir die Hartree-Näherung, die die Dichte als nichtlokales Funktional des Potentials liefert. Wenn man die Ausdehnung der Wellenfunktionen auf der Längenskala, auf der sich das Potential typischerweise ändert, vernachlässigen kann, so vereinfacht sich die Hartree-Näherung zur Thomas- Fermi-Näherung, die einen lokalen Zusammenhang zwischen Elektronendichte und Potential beschreibt. Die meisten der konkreten Rechnungen wurden im Rahmen dieser selbstkonsistenten Thomas-Fermi-Poisson-Näherung durchgeführt. Im Kapitel 3 wird allgemein das Abschirmverhalten eines 2DES im hohen Magnetfeld untersucht. Wir betrachten die Antwort auf eine harmonische Potentialmodulation im unbegrenzten 2DES und in streifenförmig begrenzten Systemen mit zwei unterschiedlichen Arten von Randbedingungen. Bei tiefen Temperaturen und hohen Magnetfeldern finden wir extrem nichtlineare Abschirmung. Im unbegrenzten 2DES charakterisieren wir die Abschirmung, indem wir die gesamte Variation des selbstkonsistent berechneten Potentials als Funktion der Amplitude des aufgeprägten cosinus-Potentials berechnen. Bei festem Magnetfeld ergeben sich so Stufenfunktionen, deren Gestalt stark vom Füllfaktor der Landau-Niveaus im homogenen Zustand ohne aufgeprägtes Potential abhängt (siehe Abbildungen 3.2- 3.6). Vielleicht noch unerwartetere Kurven ergeben sich, wenn man bei festem Modulationspotential die Varianz des selbstkonsistenten Potentials gegen das Magnetfeld B aufträgt (Abb. 3.9). Die Resultate lassen sich aber leicht verstehen und (bei Temperatur T = 0) in einem einfachen Schema (Abb. 3.7) zusammenfassen. Als ordnendes Prinzip stellt sich heraus, dass sich stets Zustände einstellen, in denen die Elektronendichte möglichst wenig von der bei verschwindendem Magnetfeld abweicht. Wenn die Zyklotronenergie groß gegen die thermische Energie kBT ist, erfordert das, dass in den großen Bereichen, in denen die Dichte variiert, ein Landau-Niveau unmittelbar an dem, im Gleichgewicht konstanten, elektrochemischen Potential liegen muss (En, “pinning”). Man nennt diese Bereiche kompressibel. In den kompressiblen Bereichen können Elektronen leicht umverteilt werden, d.h. die Dichte ist leicht veränderbar und in diesen Bereichen gibt es extrem effektive Abschirmung. Existieren kompressible Bereiche mit unterschiedlichen Landau-Niveaus (En) am elektrochemischen Potential, z.B. bei großer Modulation oder weil die Dichte zum Probenrand hin abnimmt, so gibt es zwischen benachbarten kompressiblen Bereichen mit unterschiedlichen Landau-Quantenzahlen n “inkompressible” Bereiche, in denen zwischen zwei Landau-Niveaus liegt. Dort sind alle Landau-Niveaus unterhalb von besetzt, die oberhalb leer. Folglich ist dort der Füllfaktor ganzzahlig und die Dichte konstant. Das Wechselspiel zwischen kompressiblen und inkompressiblen Bereichen bestimmt das Abschirmverhalten. Randeffekte erweisen sich nur in solchen Magnetfeldintervallen als wichtig für die Abschirmung im Inneren einer streifenförmigen Probe, in denen (schon ohne aufgeprägte Modulation) in der Probenmitte ein neuer inkompressibler Streifen entsteht. Im Kapitel 4 wird die Rolle der inkompressiblen Streifen in einer idealisierten, streifenförmigen Hall-Probe untersucht. Mithilfe einer lokalen Version des Ohmschen Gesetzes berechnen wir bei vorgegebenen Gesamtstrom die Stromdichte und das nun ortsabhängige elektrochemische Potential, dessen Gradient die Stromdichte treibt. Für den lokalen Leitfähigkeitstensor nehmen wir ein für homogenes 2DES berechnetes Resultat und ersetzen den Füllfaktor jeweils durch den lokalen Wert. Dadurch ergibt sich, dass bei Existenz inkompressibler Streifen der gesamte Strom auf diese Streifen eingeschränkt ist, in denen die Komponenten des spezifischen Widerstands die Werte des freien, idealen 2DES haben, also verschwindenden longitudinalen und quantisierten Hall-Widerstand. Aus Hartree-Rechnungen zeigen wir, dass es inkompressible Streifen nur in Magnetfeldintervallen endlicher Breite (um ganzzahlige Füllfaktoren) gibt und dass in der Nähe von Füllfaktor 4 es nur inkompressible Streifen mit dem lokalen Füll-faktor \nu(x) = 4 gibt, aber nicht solche mit \nu(x) = 2, in Gegensatz zu dem Ergebnis der Thomas-Fermi-Poisson-Näherung, die hier nicht gültig ist. Um diese Unzulänglichkeit der Thomas-Fermi-Poisson-Näherung und Artefakte des strikt lokalen Modells zu beheben, führen wir die Rechnungen mit einem (auf der Skala des mittleren Elektronenabstands) gemittelten Leitfähigkeitstensors aus. Damit erhalten wir, im Rahmen einer Linear-Response-Rechnung, sehr schöne Übereinstimmung mit den Potentialmessungen, die diese Dissertation motivierten, einen kausalen Zusammenhang zwischen der Existenz inkompressibler Streifen und der Existenz von Plateaus im QHE, und ein Verständnis der extremen Genauigkeit, mit der die quantisierten Widerstandswerte reproduziert werden können, unabhängig von Probenmaterial und -geometrie. Im Kapitel 5 untersuchen wir das Zufallspotential, in dem sich die Elektronen bewegen. Wir gehen davon aus, dass sich hinter einer undotierten Schicht eine Ebene mit zufällig verteilten ionisierten Donatoren befindet, deren Coulomb-Potentiale sich zu dem Zufallspotential überlagern. Wir weisen darauf hin, dass sich die langreichweitigen Fluktuationen dieses Potentials anders verhalten als die kurzreichweitigen. Die kurzreichweitigen klingen mit dem Abstand der Donatorebene von der Ebene des 2DES exponentiell ab, werden aber (bei B = 0) nur schwach durch das 2DES abgeschirmt. Diese Fluktuationen haben wir durch die endlichen Leitfähigkeiten und die Stoßverbreiterung der Landau-Niveaus berücksichtigt. Die langreichweitigen Fluktuationen, andererseits, sind nur schwach von der Entfernung der Donatorebene abhängig, werden aber stark vom 2DES abgeschirmt. Diese sollte man bei der selbstkonsistenten Abschirmungsrechnung explizit berücksichtigen. Erste Versuche in dieser Richtung zeigen, dass sie die Quanten-Hall-Plateaus verbreitern, verschieben und stabilisieren können. Sie sollten besonders bei breiten Proben wichtig werden, bei denen sie zusätzliche inkompressible Streifen im Probeninneren verursachen können. Schließlich diskutieren wir in Kapitel 6 Abschirmungseffekte in einem Doppelschichtsystem aus zwei parallelen 2DES. Interessante neue Effekte treten auf, wenn die Schichten verschiedene Dichten haben. Das Auftreten inkompressibler Streifen in der einen Schicht kann dann drastische Auswirkungen auf die andere Schicht haben. Widerstandsmessungen in Abhängigkeit vom Magnetfeld, die kürzlich an solchen Systemen durchgeführt wurden, zeigen, dass am Rande eines QH-Plateaus Hysterese auftritt, d.h. dass die für ansteigendes Magnetfeld gemessene Kurve nicht mit der für abfallendes Magnetfeld gemessenen Kurve übereinstimmt, wenn dieser Magnetfeldbereich in ein QH-Plateau der anderen Schicht fällt. Wir entwickeln ein Modell und beschreiben Modellrechnungen, die dieses Phänomen plausibel machen.
This thesis contributes to the field of silicon chemistry, with a special emphasis on the chemistry of penta- and hexacoordinate silicon.The spirocyclic zwitterionic Lambda5Si-silicates 1–6 with a (2,2,6,6-tetramethylpiperidinio)- methyl group and two identical bidentate chelate ligands derived from glycine, (S)-alanine, (S)-phenylalanine, (S)-valine, (S)-tert-leucine, or (S)-proline bound to the silicon(IV) coordination center were synthesized and structurally characterized for the first time.The hitherto unknown spirocyclic zwitterionic Lambda5Si-silicates 7–12 with an (ammonio)- methyl group and two identical bidentate chelate ligands derived from (S)-lactic acid, (S)-3- phenyllactic acid, or (S)-mandelic acid were synthesized and structurally characterized in the solid state (elemental analyses (C, H, N), crystal structure analyses, 15N and 29Si VACP/MAS solid-state NMR experiments) and in solution (except 10; 1H, 13C, and 29Si NMR experiments)The spirocyclic zwitterionic Lambda5Si-silicates 13, 15, and 16 with an (ammonio)methyl group and two bidentate meso-oxolane-3,4-diolato(2–) ligands bound to the silicon(IV) coordination center were synthesized for the first time. The already existent compound 14 was resynthesized in order to perform a crystal structure analysis. All compounds were characterized by elemental analyses (C, H, N), 29Si VACP/MAS solid-state NMR experiments, and solution NMR studies (1H, 13C, 15N, and 29Si NMR experiments), and compounds 14–16 were additionally studied by single-crystal X-ray diffraction.The already existent zwitterionic Lambda5Si-silicate 17 was synthesized by new methods, including a remarkable Si–C cleavage reaction with benzoin. To investigate the dynamic behavior of the known zwitterionic Lambda5Si-silicate 18 in solution, VT 1H NMR experiments in CD2Cl2 were performed in the temperature range –100 °C to 23 °C.The hexacoordinate silicon compounds 19–22 containing multidentate ligands derived from citric acid or (S)-malic acid were synthesized for the first time. The anionic Lambda6Si-silicates 19–22 were structurally characterized in the solid state by single-crystal X-ray diffraction and VACP/MAS NMR spectroscopy (13C, 15N, 29Si). Upon dissolution in water at 20 °C, spontaneous hydrolysis of the Lambda6Si-silicate anions was observed.
The plant cuticle as an interface between the plant interior and the adjoining atmosphere plays an important role in any interaction between the plant and its environment. Transport processes across the cuticles were the object of countless research since many decades. However, bulk of the work done was focused on transport of lipophilic molecules. It is highly plausible to examine the penetration of lipophilic compounds, since the cuticle is dominated by lipophilic compartments itself, and the most crop protection agents have lipophilic character. As a result of this research, cuticular transport of lipophilic compounds is relatively well understood. Since several years, examinations were expanded on transport of hydrophilic molecules. In the present study, a direct comparison was made between transport properties of lipophilic and hydrophilic compounds, which allows an objective assessment of the mechanism governing their penetration. The results of this present study debunked the existence of two different pathways across isolated cuticles of Hedera helix (English ivy), a lipophilic and a hydrophilic pathway. This finding was supported by examinations regarding to accelerator and temperature effects on the mobility of both pathways, because the hydrophilic path is insensitive to them - in contrary to the lipophilic one. The lipophilic pathway is rigorously restricted to lipophilic molecules and the hydrophilic pathway is only accessible for hydrophilic molecules. Uncharged hydrophilic compounds can cross the cuticle even the molecules are of relatively large dimensions. In contrast to that, dissociable compounds with a molar volume higher than 110 cm³ mol-1 are excluded from cuticular penetration. Differences in the mobility of uncharged and dissociable molecules might be a hint towards the chemical nature of the polar pathways. It is assumed, that both, cellulose and pectin fibrils, traverse the cuticle which are originated from the epidermal cell wall. While uncharged carbohydrates might be able to penetrate across a pathway made up of cellulose and pectin, dissociated amino acids might be restricted to the cellulose path. This could be a plausible explanation for the higher mobility and the higher cuticle/water partition coefficients of the carbohydrates compared with the amino acids. A hydrophilic pathway was found with isolated grapevine cuticles, too. The apparent size selectivity of the hydrophilic pathway implies transport via narrow pores. From the present data, a mean pore radius of 0.31 nm (H. helix) or rather 0.34 nm (V. vinifera) was calculated. The absolute number of pores per cm² is 1.1 x 109 for H. helix and 3.3 x 109 for V. vinifera cuticles. This finding and the enlarged pore size distribution of grapevine cuticles might be an explanation for the transport of uncharged and dissociable hydrophilic compounds of higher molar volume like paraquat dichloride - in contrast to ivy membranes Wax extraction of ivy membranes uncovers additional pores, which explains the increased mobilities of the hydrophilic compounds across dewaxed membranes. From these extensive measurements it is very conspicuous, that the bulk of cuticular water transpiration occurs via the polar pathway. Since the work was focused on cuticular penetration of primary metabolites like amino acids and carbohydrates, a mechanistic explanation of leaching processes is obtained, simultaneously. In cuticular research, an inconsistent terminology regarding the transport path of the hydrophilic compounds was used. The term ‘hydrophilic pathway’ is definitely correct, since it makes no statement with regard to the shape of this path. In contrast to that, the terms ‘polar pore’ or ‘aqueous pore’ could imply that there is a tube or rather a water-filled tube traversing the cuticle. However - at this point of time – the imagination about the shape of this path is a pathway across interfibrilar gaps within polysaccharide strains. The proposed diameter of these interfibrilar gaps fits very well to the diameter determined in this study. Therefore, the imagination of a pore is not unfounded, but it is a very narrow pore, definitely. Additionally, this pathway is a very straight pathway which corresponds to this simplified imagination. An expanded study was done with paraquat dichloride, which was applied as aqueous droplets on grapevine cuticles. It is assumed that these model membranes reflect transport properties which are very close to that of relevant crops and weeds. The predominating parameter for paraquat penetration is the moisture, either originated from a relative humidity of at least 75% or provided by added chemicals. There is a tendency for good suitability of hygroscopic additives. Increased paraquat penetration was also obtained by raised concentrations and removal of the cuticular waxes.
Wireless communication is nothing new. The first data transmissions based on electromagnetic waves have been successfully performed at the end of the 19th century. However, it took almost another century until the technology was ripe for mass market. The first mobile communication systems based on the transmission of digital data were introduced in the late 1980s. Within just a couple of years they have caused a revolution in the way people communicate. The number of cellular phones started to outnumber the fixed telephone lines in many countries and is still rising. New technologies in 3G systems, such as UMTS, allow higher data rates and support various kinds of multimedia services. Nevertheless, the end of the road in wireless communication is far from being reached. In the near future, the Internet and cellular phone systems are expected to be integrated to a new form of wireless system. Bandwidth requirements for a rich set of wireless services, e.g.\ video telephony, video streaming, online gaming, will be easily met. The transmission of voice data will just be another IP based service. On the other hand, building such a system is by far not an easy task. The problems in the development of the UMTS system showed the high complexity of wireless systems with support for bandwidth-hungry, IP-based services. But the technological challenges are just one difficulty. Telecommunication systems are planned on a world-wide basis, such that standard bodies, governments, institutions, hardware vendors, and service providers have to find agreements and compromises on a number of different topics. In this work, we provide the reader with a discussion of many of the topics involved in the planning of a Wireless LAN system that is capable of being integrated into the 4th generation mobile networks (4G) that is being discussed nowadays. Therefore, it has to be able to cope with interactive voice and video traffic while still offering high data rates for best effort traffic. Let us assume a scenario where a huge office complex is completely covered with Wireless LAN access points. Different antenna systems are applied in order to reduce the number of access points that are needed on the one hand, while optimizing the coverage on the other. No additional infrastructure is implemented. Our goal is to evaluate whether the Wireless LAN technology is capable of dealing with the various demands of such a scenario. First, each single access point has to be capable of supporting best-effort and Quality of Service (QoS) demanding applications simultaneously. The IT infrastructure in our scenario consists solely of Wireless LAN, such that it has to allow users surfing the Web, while others are involved in voice calls or video conferences. Then, there is the problem of overlapping cells. Users attached to one access point produce interference for others. However, the QoS support has to be maintained, which is not an easy task. Finally, there are nomadic users, which roam from one Wireless LAN cell to another even during a voice call. There are mechanisms in the standard that allow for mobility, but their capabilities for QoS support are yet to be studied. This shows the large number of unresolved issues when it comes to Wireless LAN in the context of 4G networks. In this work we want to tackle some of the problems.
Chemical neurotransmission is a complex process of central importance for nervous system function. It is thought to be mediated by the orchestration of hundreds of proteins for its successful execution. Several synaptic proteins have been shown to be relevant for neurotransmission and many of them are highly conserved during evolution- suggesting a universal mechanism for neurotransmission. This process has checkpoints at various places like, neurotransmitter uptake into the vesicles, relocation of the vesicles to the vicinity of calcium channels in order to facilitate Ca2+ induced release thereby modulating the fusion probability, formation of a fusion pore to release the neurotransmitter and finally reuptake of the vesicles by endocytosis. Each of these checkpoints has now become a special area of study and maintains its own importance for the understanding of the overall process. Ca2+ induced release occurs at specialized membrane structures at the synapse known as the active zones. These are highly ordered electron dense grids and are composed of several proteins which assist the synaptic vesicles in relocating in the vicinity of Ca2+ channels thereby increasing their fusion probability and then bringing about the vesicular fusion itself. All the protein modules needed for these processes are thought to be held in tight arrays at the active zones, and the functions of a few have been characterized so far at the vertebrate active zones. Our group is primarily interested in characterizing the molecular architecture of the Drosophila synapse. Due to its powerful genetics and well-established behavioural assays Drosophila is an excellent system to investigate neuronal functioning. Monoclonal antibodies (MABs) from a hybridoma library against Drosophila brain are routinely used to detect novel proteins in the brain in a reverse genetic approach. Upon identification of the protein its encoding genetic locus is characterized and a detailed investigation of its function is initiated. This approach has been particularly useful to detect synaptic proteins, which may go undetected in a forward genetic approach due to lack of an observable phenotype. Proteins like CSP, Synapsin and Sap47 have been identified and characterized using this approach so far. MAB nc82 has been one of the shortlisted antibodies from the same library and is widely used as a general neuropil marker due to the relative transparency of immunohistochemical whole mount staining obtained with this antibody. A careful observation of double stainings at the larval neuromuscular junctions with MAB nc82 and other pre and post-synaptic markers strongly suggested an active zone localization of the nc82 antigen. Synaptic architecture is well characterized in Drosophila at the ultrastructural level. However, molecular details for many synaptic components and especially for the active zone are almost entirely unknown. A possible localization at the active zone for the nc82 antigen served as the motivation to initiate its biochemical characterization and the identification of the encoding gene. In the present thesis it is shown by 2-D gel analysis and mass spectrometry that the nc82 antigen is a novel active zone protein encoded by a complex genetic locus on chromosome 2R. By RT-PCR exons from three open reading frames previously annotated as separate genes are demonstrated to give rise to a transcript of at least 5.5 kb. Northern blots produce a prominent signal of 11 kb and a weak signal of 2 kb. The protein encoded by the 5.5 kb transcript is highly conserved amongst insects and has at its N-terminus significant homology to the previously described vertebrate active zone protein ELKS/ERC/CAST. Bioinformatic analysis predicts coiled-coil domains spread all over the sequence and strongly suggest a function involved in organizing or maintaining the structure of the active zone. The large C-terminal region is highly conserved amongst the insects but has no clear homologues in veretebrates. For a functional analysis of this protein transgenic flies expressing RNAi constructs under the control of the Gal4 regulated enhancer UAS were kindly provided by the collaborating group of S.Sigrist (Gِttingen). A strong pan-neuronal knockdown of the nc82 antigen by transgenic RNAi expression leads to embryonic lethality. A relatively weaker RNAi expression results in behavioural deficits in adult flies including unstable flight and impaired walking behavior. Due to this peculiar phenotype as observed in the first knockdown studies the gene was named “bruchpilot” (brp) encoding the protein “Bruchpilot (BRP)” (German for crash pilot). A pan-neuronal as well as retina specific downregulation of this protein results in loss of ON and OFF transients in ERG recordings indicating dysfunctional synapses. Retina specific downregulation also shows severely impaired optomotor behaviour. Finally, at an ultrastructural level BRP downregulation seems to impair the formation of the characteristic T-shaped synaptic ribbons at the active zones without significantly altering the overall synaptic architecture (in collaboration with E.Asan). Vertebrate active zone protein Bassoon is known to be involved in attaching the synaptic ribbons to the active zones as an adapter between active zone proteins RIBEYE and ERC/CAST. A mutation in Bassoon results in a floating synaptic ribbon phenotype. No protein homologous to Bassoon has been observed in Drosophila. BRP downregulation also results in absence of attached synaptic ribbons at the active zones. This invites the speculation of an adapter like function for BRP in Drosophila. However, while Bassoon mutant mice are viable, BRP deficit in addition to the structural phenotype also results in severe behavioural and physiological anomalies and even stronger downregulation causes embryonic lethality. This therefore suggests an additional and even more important role for BRP in development and normal functioning of synapses in Drosophila and also in other insects. However, how BRP regulates synaptic transmission and which other proteins are involved in this BRP dependant pathway remains to be investigated. Such studies certainly will attract prominent attention in the future.
The development of ethanol tolerance is due to changes in synaptic plasticity. Since the mechanisms mediating synaptic plasticity are probably defective in the mutant hangAE10, it was a goal of the present study to find out how HANG contributes to synaptic plasticity. In particular, it was important to clarify in which neuronal process HANG plays a role. Antibody stainings against HANG revealed that the protein is localized in all neuronal nuclei of larval and adult brains; the staining is absent in hangAE10, thus confirming that this P-element insertion stock is a protein null for HANG. Detailed analysis of the subnuclear distribution of HANG showed that HANG immunoreactivity is enriched at distinct spots in the nucleus in a speckled pattern; these speckles are found at the inside of the nuclear membrane and do not colocalize with chromatin nor with the nucleolus; thus, HANG is probably involved in the stabilization, processing or export of RNAs. As synaptic plasticity can be studied in single neurons at the larval neuromuscular junction, the morphology of the synaptic terminals of hangAE10 mutants was analyzed at muscle 6/7, segment A4. These studies revealed that hangAE10 mutants display a 40 % increase in bouton number and axonal branch length; in addition, some boutons have an abnormal hourglass-like shape, suggesting that they are arrested in a semi-separated state following the initiation of bouton division. The increase in bouton number of hang mutants is mainly due to an increase in numbers of type Ib boutons. The analysis of the distribution of several synaptic markers in hang mutants did not show abnormalities. The presynaptic expression of HANG in hang mutants rescues the increase in bouton number and axonal branch length, thus proving that the phenotypes seen in the P-element insertion hangAE10 are attributable to the lack of HANG rather than to effects of the P-element marker rosy or to a secondary hit on the same chromsome during mutagensis. This finding is further supported by the fact that postsynaptic expression of HANG does not rescue the abnormal NMJ morphology of hangAE10. Alterations in cAMP levels regulate the number of boutons; since hang mutants display an increase in bouton number, the questions was whether this morphological abnormality was due to defects in cAMP signalling. To test this hypothesis, hangAE10 NMJs were compared to those of the hypomorphic allele dnc1 that has a defective cAMP cascade. Some aspects of the NMJ phenotype (e.g. the increase in bouton number and the unaltered ratio of active zones per bouton area) are similar in hangAE10 and dnc1, other differ. Expression of a UAS-dnc transgene in hangAE10 mutants does not modify the phenotype. In summary, the results of this study indicate that nuclear protein HANG might be involved in isoform-specific splicing of genes required for synaptic plasticity at the NMJ.
The present research is concerned with the topic of socially induced affect. In previous research the focus was mainly on affective convergence. A prominent topic in that context was “emotional contagion” (Hatfield, Cacioppo, & Rapson, 1994). Affective divergence has been also been found. However, its influence on the theoretical debate remained weak. Besides research on emotions also social comparison research attended to the topic. In order to explain affective divergence and convergence an integrative model based on social comparison processes is proposed here. Based on the selective accessibility model (Mussweiler, 2003) it is assumed that affective convergence can be seen as assimilation to a comparison standard (the observed model). Therefore, the basic assumption is that a comparison between an observer and the model takes place. Affective divergence corresponds to an affective contrast from that standard. Which of these two phenomena occurs depends on the type of comparison processes that took place. Six experiments were conducted. In Experiment 1 it was shown that comparisons intensify the social induction of affect. The influence of the comparison focus was studied in Experiments 2 and 3. If the perceiver searches for similarities between the self and the model, affective convergence occurs. If differences are searched for, affective divergence is found. The latter is mainly found under special circumstances, e.g. if the model belongs to another social group (Experiment 3). In Experiment 1-3 it was shown comparisons influence the social induction of affect. In Experiment 4-6 the underlying processes were explored. The selective accessibility model (Mussweiler, 2003) attributes a central role to the selective activation of self-knowledge in order to explain judgmental assimilation and contrast. In Experiments 4 and 5 the role of the self was explored more thoroughly. Evidence for socially induced affect (affective convergence) has only been found when the self has been previously activated. When the self was not activated no such effect was found. The assumption that the activation of specific self-knowledge is the basis for socially induced affect was tested in Experiment 5. Results supported the assumption. The present experiments give rise to the assumption that social comparisons are a key element in the social induction of affect. Affective convergence and divergence are explained and processes for the affect induction are defined. The findings also have implications for research on automatic behaviour and especially to explain automatic contrast. In addition implications for social comparison research can be derived.
The development of free floating exchange rates can hardly be explained by macroeconomic fundamentals as supposed by traditional economic theories. Therefore, prominent economists yet conclude that there exists an ‘exchange rate disconnect puzzle’ (see Obstfeld and Rogoff [2000]). The observable exchange rate trends are often attributed to an excessive speculative trading behavior of foreign exchange market participants. In this study we deal with psychological factors, which may be important for understanding the observable exchange rate movements. Thus, our study belongs to the new research field of behavioral economics, which considers the relevance of psychological factors in economic contexts. The main objective of behavioral economists is to develop a more realistic view of the actual human behavior in the context of economics. Therefore, behavioral economists often refer to the work of behavioral decision theorists, who introduced new concepts under the general heading of bounded rationality. Central to the concept of bounded rationality is the assumption that humans’ actual behavior deviates from the ideal of economic rationality due to at least two reasons: first, decisions are usually based on an incomplete information basis (limited information) and, second, the information processing of human beings is limited by their computational capacities (limited cognitive resources). Due to these limitations people are forced to apply simplification mechanisms in information processing. Important simplification mechanisms, which play a decisive role in the process judgment and decision making, are simple heuristics. Simple heuristics can principally be characterized as simple rules of thumb, which allow quick and efficient decisions even under a high degree of uncertainty. In this study, our aim is to analyze the relevance of simple heuristics in the context of foreign exchange markets. In our view, the decision situation in foreign exchange markets can serve as a prime example for decision situations in which simple heuristics are especially relevant as the complexity of the decision situation is very high. The study is organized as follows. In Chapter II, we deal with the exchange rate disconnect puzzle. In particular, we discuss and check the main implications of the traditional economic approach for explaining exchange rate movements. The asset market theory of exchange rate determination implies that exchange rates are mainly driven by the development of macroeconomic fundamentals. Furthermore the asset market theory assumes that foreign exchange market participants form rational expectations concerning future exchange rate developments and that exchange rates are determined in efficient markets. Overall the empirical evidence suggests that the traditional approach for explaining exchange rate changes is at odds with the data. Chapter III addresses the existence of long and persistent trends in exchange rate time series. Overall, our empirical analysis reveals that exchange rates show a clear tendency to move in long and persistent trends. Furthermore, we discuss the relevance of speculation in foreign exchange markets. With regard to the impact of speculation, economic theory states that speculation can have either a stabilizing effect or a destabilizing effect on exchange rates. At the end of Chapter III, we examine the Keynesian view on the functioning of asset markets. In Chapter IV we explore the main insights from the new research field of behavioral economics. A main building block of behavioral economics is the concept of bounded rationality first introduced by Herbert Simon [1955]. In the centre of the concept of bounded rationality is a psychological analysis of the actual human judgment and decision behavior. In Chapter IV, we discuss the concept of bounded rationality in detail and illustrate important insights of behavioral decision theories. In particular, we deal with the relevance of simple heuristics in the context of foreign exchange markets. Chapter V provides experimental and empirical evidence for the suggested relevance of simple heuristics in foreign exchange markets. In the first experiment, we deal with the human expectation formation. We compare point forecasts of the EUR/USD exchange rate surveyed from professional analysts and experimentally generated point forecasts of students for a simulated exchange rate time series. The results show that the forecasting performance of both groups differs substantially. Afterwards we analyze the nature of expectation formation of both groups in detail to reveal similarities and differences, which allow us to draw reasonable explanations for the differences in the forecasting performances. In the second experiment, we analyze the expectation formation in an experimental foreign exchange market. This approach allows us to consider the relevance of expectation feedback as individuals’ expectations directly influence the actual realization of the time series. Thus, Keynes’ predictions on the importance of conventions in asset markets can be analyzed. Overall, both experiments reveal that the human beings tend to apply simple trend heuristics, when forming their expectations about future exchange rates. In the empirical part of Chapter V we deal with the usefulness of such simple trend heuristics in real world. Only if simple trend heuristics lead to profits in the specific environment of foreign exchange markets, their application can be recommended. Thus, we analyze the profitability of simple technical analysis tools in foreign exchange markets. Finally, Chapter VI provides concluding remarks.
Because of growth and development, plant tissues are characterised by a permanent change in source-sink relations. Tissues with a net carbohydrate export (source) or import (sink) have to adopt their actual demand for assimilates according to the developmental status. Furthermore, plants, as sessile life forms, have developed regulatory mechanisms that enable a flexible response of assimilate partitioning to specific requirements of the habitat, like biotic and abiotic stress factors and changing light conditions. The distribution of assimilates involves specific enzyme functions including sugar transporters and sucrose cleaving enzymes and is regulated by a variety of stimuli. Extracellular invertases cover an essential function in apoplastic phloem unloading and play an important role in regulating source-sink relations. This property is reflected by the occurrence of different invertase isoenzymes with specific expression and regulation patterns that enable a co-ordination of the carbohydrate metabolism in diverse tissues, at different developmental stages, and under varying environmental conditions. Improved knowledge of extracellular invertase function might allow altering growth, development or pathogen resistance of crop plants in a specific way. The present study is aimed at elucidating the regulation patterns and functions of three members of the extracellular invertase gene family of tomato, Lin5, Lin6, and Lin7. Detailed promoter analysis revealed a tissue- and developmental-specific expression of isoenzymes and corresponding regulation patterns. Lin5 shows a developmental regulated expression in fruits. Lin6 is expressed in early developmental stages starting in germinating seeds; in grown up plants Lin6 is solely expressed in pollen and upon wound-stimulation. Lin7 is exclusively expressed in tapetum and pollen tissue. The hormonal regulation of all three isogenes was analysed in detail, whereby known GA- and JA-mediated flower phenotypes could be correlated with invertase functions. In addition, an important role of Lin7 invertase in pollen germination was demonstrated in a functional approach. This is the most profound analysis of extracellular invertases in the delicate process of floral organ development that includes three tomato isoenzymes. In particular, dissection of the individual roles of Lin5, Lin6, and Lin7 reveals novel insights in carbohydrate supply during flower and fruit development. The analysed tissue-specific promoters are profitable tools in plant biotechnology, which in particular applies to the pollen-specific Lin7 promoter. It has been demonstrated that the Lin6 promoter serves as target for hormonal-, sugar-, and wound-mediated signalling pathways. Moreover, a functional interaction of circadian oscillator elements of A. thaliana with the Lin6 promoter and a diurnal rhythm of Lin6 expression have been substantiated. This complex regulation pattern is reflected by the identification of many well-defined cis-acting elements within the Lin6 promoter. This feature supports an integration of various stimuli mediated via extracellular invertase expression resulting in a co-ordinated cellular response to changing internal and external conditions. As sugars on their part induce Lin6 expression, this could result in signal amplification via a positive feedback loop. Furthermore, the extensive appearance and constellation of cisacting elements within the Lin6 promoter provides the basis to answer questions in signal cross-talk and signal integration in plant gene expression. In addition, the Lin6 promoter was successfully used as an inducible expression system. In transgenic tobacco lines an invertase inhibitor was expressed under control of the cytokinin-inducible Lin6 promoter. Thereby, a causal relationship between cytokinin and extracellular invertase for the delay of senescence was demonstrated. This study emphasises the importance of inducible expression systems to address specific questions on a molecular basis. The above-mentioned promoter sequences were obtained via sequential genome walks. Hereby two interesting structural features appeared. First, Lin5 and Lin7 genes are arranged in a direct tandem repeat on the genome. Second, a CACTA-like transposon insertion in intron I of the Lin5 gene was revealed. A primer pair deduced from the transposase region of this transposon allowed the amplification of similar sequences of various Solanaceae species.
In the last years, visual methods have been introduced in industrial software production and teaching of software engineering. In particular, the international standardization of a graphical software engineering language, the Unified Modeling Language (UML) was a reason for this tendency. Unfortunately, various problems exist in concrete realizations of tools, e.g. due to a missing compliance to the standard. One problem is the automatic layout, which is required for a consistent automatic software design. The thesis derives reasons and criteria for an automatic layout method, which produces drawings of UML class diagrams according to the UML specification and issues of human computer interaction, e.g. readability. A unique set of aesthetic criteria is combined from four different disciplines involved in this topic. Based on these aethetic rules, a hierarchical layout algorithm is developed, analyzed, measured by specialized measuring techniques and compared to related work. Then, the realization of the algorithm as a Java framework is given as an architectural description. Finally, adaptions to anticipated future changes of the UML, improvements of the framework and example drawings of the implementation are given.
Burn severity was measured within the Mediterranean sclerophyll forests of south-west Western Australia (WA) using remote sensing data from the Moderate Resolution Imaging Spectroradiometer (MODIS). The region of south-west WA is considered as a high fire prone landscape and is managed by the state government’s Department of Conservation and Land Management (CALM). Prescribed fuel reduction burning is used as a management tool in this region. The measurement of burn severity with remote sensing data focused on monitoring the success and impact of prescribed burning and wildfire in this environment. The high temporal resolution of MODIS with twice daily overpasses in this area was considered highly favourable, as opportunities for prescribed burning are temporally limited by climatic conditions. The Normalised Burn Ratio (NBR) was investigated to measure burn severity in the forested area of south-west WA. This index has its heritage based on data from the Landsat TM/ETM+ sensors (Key and Benson, 1999 [1],[2]) and was transferred from Landsat to MODIS data. The measurement principally addresses the biomass consumption due to fire, whereas the change detected between the pre-fire image and the post-fire image is quantified by the ÄNBR. The NBR and the Normalised Difference Vegetation Index (NDVI) have been applied to MODIS and Landsat TM/ETM+ data. The spectral properties and the index values of the remote sensing data have been analysed within different burnt areas. The influence of atmospheric and BRDF effects on MODIS data has been investigated by comparing uncorrected top of atmosphere reflectance and atmospheric and BRDF corrected reflectance. The definition of burn severity classes has been established in a field trip to the study area. However, heterogeneous fire behaviour and patchy distribution of different vegetation structure made field classification difficult. Ground truth data has been collected in two different types of vegetation structure present in the burnt area. The burn severity measurement of high resolution Landsat data was assessed based on ground truth data. However, field data was not sufficient for rigorous validation of remote sensing data. The NBR index images of both sensors have been calibrated based on training areas in the high resolution Landsat image. The burn severity classifications of both sensors are comparable, which demonstrates the feasibility of a burn severity measurement using moderate spatial resolution 250m MODIS data. The normalisation through index calculation reduced atmospheric and BRDF effects, and thus MODIS top of at-mosphere data has been considered suitable for the burn severity measurement. The NBR could not be uniformly applied, as different structures of vegetation influenced the range of index values. Furthermore, the index was sensitive to variability in moisture content. However, the study concluded that the NBR on MODIS data is a useful measure of burn severity in the forested area of south-west WA.
The maximum of the brain electrical field after NoGo stimuli is located more anteriorly than that after stimuli that tells participants to respond. The difference in topography was called NoGo-Anteriorization (NGA). Recently, there was a debate, whether the NGA is related to a central inhibitory process or not. However, experiments showed that the NGA is not the result of motor potentials during Go trials, the NGA does not represent higher response conflict and or higher mental effort in NoGo trials, and the NGA is not based on less cognitive response selection in NoGo trials. Therefore, the experiments support the assumption that the NGA is connected to an inhibitory mechanism in NoGo conditions.
In a three-year study the current aeolian transportation processes were examined in a linear dune area previously used for grazing near Nizzana at the Israeli-Egyptian border. The research area was subject to heavy grazing across the border, which led to the total destruction of the natural vegetation in the period of 1967 to 1982. As a consequence, intensified aeolian activity and significant changes of the morphology of the dunes were observed. After the end of the grazingg on the Israeli side, a rapid return of the vegetation in the interdune corridors and on the footslopes of the dunes took place. In addition also a reduction of obviously active areas on the dune crests was observed. The situation on Egyptian territory west the border remained unchanged until today. This study is aimed at understanding the changed aeolian morphodynamics east the border. The emphasis was placed on the investigation of the spatial and temporal distribution of aeolian sand transport as well as on the influencing factors morphology, surface condition and vegetation.
The establishment of genomic approaches including the sequence determination of complete bacterial genomes started a new era in microbiological research. Since then more than two hundred prokaryotic and eukaryotic genomes have been completely sequenced, and there are additional complete genome projects including different bacterial species and strains in progress (http://www.tigr.org, http://www.sanger.ac.uk). The continously growing amount of bacterial DNA sequence information gives us also the possibility to gain deeper insight into bacterial pathogenesis. With the help of comparative genomics, microbiological research can focus on those DNA sequences that are present in pathogenic bacteria but are absent in non-pathogenic strains. With this knowledge and with the help of molecular biological methods such as PCR,DNA-chip technology, subtractive hybridisation, transcriptomics and proteomics we can analyse in detail what makes a particular bacterial strain pathogenic. This knowledge also gives us the possibility to develop new vaccines, therapeutic approaches or diagnostic tools. The aim of this work was the structural and functional analysis of DNA regions of uropathogenic Escherichia coli strain 536 that belong to the flexible E. coli gene pool. The first part of this thesis focused on the identification and structural characterisation of pathogenicity island V of strain 536 (PAI V536). PAI V536 is integrated at the pheV tRNA gene at 64 minutes of the E. coli K-12 chromosome. In addition to the intact pheV tRNA gene, a truncated copy ('pheV) that represents the last 22 bp of this gene’s 3'-end was identified 49 kb downstream of pheV on PAI V536. The analysis of the DNA sequence flanked by pheV and 'pheV revealed characteristics that are typical of PAIs. This DNA region exhibits homology to IS-elements and prophages and also comprises determinants coding for the Pix fimbriae, a phosphoglycerate transport system, an autotransporter, as well as for hypothetical proteins. Downstream of 'pheV, the K15 capsule determinant (kpsK15) of this strain is located. Structural analysis of the 20-kb kpsK15 locus revealed a so far unknown genetic organisation indicative of recombination events between a group 2 and group 3 capsule gene cluster. Downstream of the capsule determinant, the genes encoding a type II secretion system (general secretion pathway -GSP) are located on PAI V536. The K15 capsule locus was functionally characterized. Specific inactivation of each of the regions 1 to 3 of the kpsK15 gene cluster, and the use of a K15 capsule-specific antiserum demonstrated that this determinant is the functional K15 capsule locus of strain 536. It has been shown in an experimental murine model of ascending urinary tract infection with suckling mice that the K15 capsule contributes to urovirulence. Interestingly, the K15 capsule is not involved in serum resistance of strain 536. Inactivation of the PAI V536-encoded type II secretion system excluded a role of this general secretion pathway for capsule biosynthesis and virulence of strain 536 in the murine ascending urinary tract infection model. In the second part of the thesis, the transferability of PAIs was further investigated. Using PAI II536 as a model, mobilisation of this island from strain 536 into suitable recipient strains was investigated. For this purpose, an antibiotic resistance cassette, the R6K origin of replication as well as plasmid pGP704 carrying the mobilisation region of plasmid RP4 have been inserted into PAI II536. Transformation with the helper plasmid RP4, resulted a derivative of strain 536 that was used as a donor for conjugation experiments, while for recipient the pir + laboratory strain SY327 was used. After deletion the circularised PAI II536 was mobilised with the help of the conjugative helper plasmid (RP4) into the recipient laboratory strain SY327. The frequency of this event was about 10-8. It was also demonstrated that in the transconjugant strains the mobilized PAI II536 could be permanently present as a circular form and also can be integrated into the chromosome at the same chromosomal insertion site (leuX) as in the donor strain 536. Furthermore, after mobilisation and chromosomal integration of PAI II536 it was possible to remobilise this PAI back to a PAI II536-negative derivative of strain 536. The results obtained in this thesis increase our knowledge of the structure and function of a pathogenicity island of uropathogenic E. coli strain 536 and shed some light on the mechanisms contributing to genome plasticity and evolution of pathogenic E. coli variants.
Spreds are a new Sprouty-related family of membrane-associated proteins inhibiting the MAPK signaling pathway by interacting with Ras and Raf-1. Different studies have already demonstrated the inhibitory function of Spreds in cell culture systems, but the in vivo function of Spreds in the whole organism was still unclear. Therefore, Spred-2 knockout mice were generated using a gene trap approach. The Spred-2 deficiency was verified on RNA and protein levels and the lack of functional Spred-2 protein in mice caused a dwarf phenotype similar to achondroplasia, the most common form of human dwarfism. Spred-2-/- mice showed reduced growth and body weight, they had a shorter tibia length and showed narrower growth plates as compared to wildtype mice. Spred-2 promoter activity and protein expression were detected in chondrocytes, suggesting an important function of Spred-2 in chondrocytes and bone development. Furthermore, stimulation of chondrocytes with different FGF concentrations showed earlier and augmented ERK phosphorylation in Spred-2-/- chondrocytes as compared to Spred-2+/+ chondrocytes. These observations suggest a model, in which loss of Spred-2 inhibits bone growth by inhibiting chondrocyte differentiation through upregulation of the MAPK signaling pathway. An additional observation of Spred-2-/- mice was an increased bleeding phenotype after injuries, whereas the bleeding volume was extremely enlarged and the bleeding time was significantly prolonged. So far, hypertension as cause could be excluded, but to discover the physiological reasons for this phenotype, the different steps of the clotting cascade have to be investigated further. As the Spred-2 promoter activity studies demonstrated a high and specific Spred-2 expression in vascular smooth muscle cells and previous studies showed an interaction of Spreds with RhoA, a key regulator of vascular smooth muscle contraction, the regulation of smooth muscle contractility seems to be a good candidate of this phenomenon. Moreover, Spred-1 and Spred-2 specific antibodies were generated as important tools to study the protein expression patterns in mice. Furthermore, nothing was known about the Spred-2 promoter region and its regulation. Here, a detailed in situ analysis of the physiological promoter activity profile in the gene trapped Spred-2-deficient mouse strain was shown. In these mice, the beta-galactosidase and neomycin fusion gene (β-geo) of the gene trap vector was brought under control of the endogenous Spred-2 promoter, giving the opportunity to monitor Spred-2 promoter activity in practically every organ and their corresponding sub-compartments. X-Gal staining of sections of newborn and adult mice revealed 1) a very high Spred-2 promoter activity in neural tissues and different glands; 2) a high activity in intestinal and uterine smooth muscle cells, and kidney; 3) a low activity in heart, testis, lung, and liver; 4) an almost lacking activity in skeletal muscle and spleen, and 5) very interestingly, a very distinct and strong activity in vascular smooth muscle cells. Moreover, comparison of newborn and adult mouse organs revealed a nearly congruent Spred-2 promoter activity. These detailed data provide valuable information for further studies of the physiological functions of Spred-2 in organs showing strong Spred-2 promoter activity, which are in most of these organs still unclear. Finally, gene targeting vectors for Spred-1 and Spred-2 were cloned, to generate ES cells with a floxed exon 2 of the Spred-1 and Spred-2 gene, respectively. Now, these ES cells are valuable tools to establish conditional knockout mice. This is of major interest to investigate the physiological tissue specific functions of Spred-1 and Spred-2, especially if the double knockout mice are not viable.
Somites are repeated epithelial segments that are generated in a rhythmic manner from the presomitic mesoderm (PSM) in the embryonic tailbud. Later, they differentiate into skeletal muscle, cartilage and dermis. Somitogenesis is regulated by a complex interplay of different pathways. Notch/Delta signaling is one of the pathways well characterized in zebrafish through mutants affected in its different components. Previous work in mouse, chicken and zebrafish has shown that also additional components are required during somitogenesis, most importantly through an FGF and Retinoic acid (RA) gradient, as well as Wnt signaling. However, no zebrafish mutants with defects in these pathways showing specific somite malformations are described. This was explained by functional redundancies among related genes that have resulted from a whole genome duplication which occurred in a teleost fish ancestor 350 million years ago. As distinct duplicates exist in different teleost species, a large scale mutagenesis screen in the medaka (Oryzias latipes) has been performed successfully in Kyoto, Japan. I analyzed nine of the isolated medaka mutants that show variable aspects of somitic phenotypes. This includes a complete or partial loss of somite boundaries (e.g. bms and sne), somites with irregular sizes and shapes (e.g. krz and fsl) or partially fused and enlarged somites (e.g. dpk). Although some of these medaka mutants share characteristics with previously described zebrafish somite mutants, most of the mutants represent unique phenotypes, not obtained in the zebrafish screens. In-situ hybridization analyses with marker genes implicated in the segmentation clock (e.g. her7), establishment of anterior-posterior (A-P) polarity (e.g. mesp) and differentiation of somites (e.g. myf5, lfng) revealed that the medaka mutants can be separated into two classes. Class I shows defects in tailbud formation and PSM prepatterning, and lateron somite boundary formation was impaired in these mutants. A unique member of this class with a novel phenotype is the doppelkorn (dpk) mutant that has single fused or enlarged somites. This phenotype has not been reported till now in zebrafish somite mutants. In-situ analyses on dpk showed that stabilization of the cyclically expressed somitogenesis clock genes must be affected in this mutant. This is accompanied by a disrupted regulation of A-P polarity genes like mesp. This suggests that dpk is a mutant deficient in the wave front, which is necessary for the down-regulation of oscillating genes in the anterior PSM. Furthermore, as the initiation of oscillation of all three cyclic her genes was unaffected in dpk embryos, I could exclude that this mutant in affected in the Notch/Delta pathway. Another mutant that belongs to this class is the samidare (sam) mutant. Morphologically, sam mutants are similar to zebrafish after eight (aei). In both cases, the first 7-9 somites are formed properly, but after this somite formation ceases. Different to the situation in aei, sam mutant embryos presented an additional defect in the mid-hindbrain boundary (MHB) region. Similar MHB defects were described in the zebrafish fgf8 mutant acerebellar (ace). In ace zebrafish mutant, somites were only slightly defective, although FGF signaling has been shown to be important for somite formation in chicken, mouse and zebrafish. This was explained by functional redundancy between fgf8 and fgf24 ligands in the tailbud of zebrafish. Thus, it is interesting to suggest that the sam mutant, based on the parallel defects in somites and MHB, is a potential member of the FGF signaling pathway muatnts. It was shown that FGF plays a crucial role during MHB formation in medaka. In addition, I showed that fgf8 acts non-redundantly during tailbud formation and somitogenesis in medaka. Furthermore, I showed that FGF signaling regulates somite size also in medaka and that fgfr1 is the only FGF receptor expressed in the tailbud and somites. In class II medaka somite mutants, PSM prepatterning appears normal, whereas A-P polarity, boundary formation, epithelialization or the later differentiation of somites appears to be affected. Such mutants have not been isolated so far in zebrafish, mice or chicken. Therefore, medaka class II somite mutants seem to be a novel group of mutants that opens new perspectives to analyze A-P polarity regulation, determination and boundary formation in the presence of a normally functioning clock in the PSM. Identifying the encoding genes for all analyzed medaka somite mutants will contribute to the understanding of the molecular interactions of different signaling pathways involved during somitogenesis, and is expected to result in the identification of new components.
The Bafoussam area in west Cameroon is located within the Cameroon Neoproterozoic orogenic belt (north of the Congo craton) which is part of the Central African Fold Belt (CAFB).The evolution of the CAFB is related to the collision between the convergent West African craton, the São Francisco – Congo cratons and the Sahara Metacraton. The outcrop area stretches over a surface of ~1000 km2 and dominantly consists of granitoids which intruded wall-rocks of gneiss and migmatite during the Pan-African orogeny. The Bafoussam granitoid emplacement was influenced by the N 30 °E strike-slip shear zone in the prolongation of the Cameroon Volcanic Line, but also by the N 70 °E Central Cameroon Shear Zone. In the field, these two shear directions are expressed in the schistosity and foliation trajectories, fault orientation and the alignment of the volcanic cones as well. In the Bafoussam area, four types of granitoids can be distinguished, including: (i) the biotite granitoid, (ii) the deformed biotite granitoid, (iii) the mega feldspar granitoid, and (iv) the two-mica granitoid. These granitoids occur as elongated plutons hosting irregular mafic enclaves (amphibole-bearing, biotite-rich, and metagabbroic types) and are frequently cut by late pegmatites, aplite dykes and quartz veins. Petrographically, they range in composition from syenogranite (major), alkali-feldspar granite, granodiorite, monzogranite, quartz-syenite, quartzmonzonite to quartz-monzodiorite. Potassium feldspar, quartz, plagioclase and biotite are the principal phases, in cases accompanied by amphibole and accessory minerals such as apatite,zircon, monazite, titanite, allanite, ilmenite and magnetite. Sericite, epidote and chlorite are secondary minerals. In addition, the two-mica granitoid contains primary muscovite and sometimes igneous garnet. In the granitoids, potassium feldspar is orthoclase (microcline and orthoclase: Or81–97Ab19–3), and plagioclase is mainly oligoclase with some albite and andesine (An3–35Ab96–64).Biotite is Fe-rich (meroxene and lepidomelane, with some siderophyllite), having high Fe2+/(Fe2+ + Mg) ratios of 0.40–0.80. It is a re-equilibrated primary biotite and suggests calc-alkaline and peraluminous nature of the host granitoids. Amphibole is edenitic and magnesian hastingsitic hornblende, with high Mg/(Mg + Fe2+) ratios of 0.50–0.62. The evolution of the hornblende was dominated by the edenitic, tschermakitic, pargasitic and hastingsitic substitution types. Primary muscovite is iron-rich [Fe2+/(Fe2+ + Mg) = 0.52–0.82] and has experienced celadonite and paragonite substitutions. Igneous garnet is almandine–spessartine (XFe = 0.99 and XMn = 0.46–0.56). The euhedral grain shapes of garnet crystals and the absence of inclusions coupled with the high Mn and Fe2+contents (2.609–3.317 a.p.f.u and 2.646–3.277 a.p.f.u,respectively) and low Mg contents (0.012–0.038 a.p.f.u) clearly point to its plutonic origin. The Mn-depletion crystallization model is suggested for the origin of the analyzed garnet, i.e. initial crystallization of garnet inducing early decrease of Mn in the original melt. Aluminum-in-hornblende and phengite barometric estimates show that the granitoids crystallized at 4.2 ± 1.1 to 6.6 ± 1.0 kbar, corresponding to emplacement depths of 15–24 km.Zircon and apatite saturation temperature calibrations and hornblende–plagioclase thermometry yielded emplacement temperatures between 772 ± 41 and 808 ± 34 °C. Except the two-mica granitoid, the titanite–magnetite–quartz assemblage gives oxygen fugacities ranging from 10–17 to 10–13, suggesting that the granitoids were produced by an oxidized magma. Since the twomica granitoid lacks magnetite, it was originated from a magma under reducing conditions, below the quartz–fayalite–magnetite buffer. Fluid inclusions in quartz from hydrothermal veins are secondary in nature and are found in trails along healed microcracks or in clusters. Two types of fluid inclusion have been recognized, mixed aqueous–non-aqueous volatile fluid inclusions subdivided into aqueous-rich mixed and non-aqueous volatile-rich mixed fluid inclusions, and pure aqueous fluid inclusions.The non-aqueous volatile-rich mixed fluid inclusions are one-, two-, or three-phase inclusions, whereas the aqueous-rich mixed fluid inclusions are exclusively three-phase inclusions. Both have similar low to moderate salinities (1 to 10 equiv. wt. %). The total homogenization temperatures of the aqueous-rich mixed fluid inclusions are slightly lower than those of the nonaqueous volatile-rich mixed fluid inclusions, ranging from 150 to 250 °C and 170 to 300 °C,respectively. They contain nearly pure CO2, or CO2 with addition of 4.1–13.5 mole % CH4 as volatile constituents. Pure aqueous fluid inclusions are two-phase with lower total homogenization temperatures (130–150 °C) and salinities ranging from 3 to 8 equiv. wt. %. They display mixing salt system characteristics, having NaCl as the dominant salt and considerable amounts of other divalent cations. Aqueous-rich mixed fluid inclusions and pure aqueous fluid inclusions exhibit a low geothermal gradient value of 18 °C/km, whereas the non-aqueous volatiles-rich mixed fluid inclusions have a high density which correspond to high geothermal gradient of 68 °C/km. The studied granitoids are intermediate to felsic in compositions (56.9–74.6 wt. % SiO2)and have high contents of alkalis K2O (1.73–7.32 wt. %) and Na2O (1.25–5.13 wt. %) but low abundances in MnO (0.01–0.20 wt. %), MgO (0.10–3.97 wt. %), CaO (0.37–4.85 wt. %), P2O5(up to 0.90 wt. %). They display variable contents in TiO2 (0.07–0.91 wt. %), Fe2O3* (total Fe = 0.96–7.79 wt. %) and Al2O3 (12.0–17.6 wt. %) contents. The granitoids show a wide range of high-field-strength elements (HFSE) and large ion lithophile elements (LILE) contents, with felsic granitoids being enriched in HFSE and the intermediate granitoids displaying in contrast high LILE concentrations. They exhibit chemical characteristics of non-alkaline to mid-alkaline, alkali-calcic, calc-alkaline, K-rich to shoshonitic, ferriferous affinities. Chondrite-normalized rare earth element (REE) patterns are characterized by a strong enrichment in light compared to heavy REEs [(La/Sm)N = 3.23–9.65 and (Ga/Lu)N = 1.45–5.54, respectively], with small to significant negative Eu anomalies (Eu/Eu* = 0.28–1.08). Ocean ridge granites (ORG)normalized multi-elements spidergrams display typical collision-related granites pattern, with characteristic negative anomalies of Ba, Nb and Y, and positive anomalies in Rb, Th and Sm. The granitoids under study are genetically I-type granitoids (biotite granitoid, deformed biotite granitoid and mega feldspar granitoid) and one S-type granitoid (two-mica granitoid). The I-type granitoids are metaluminous (ASI: 0.70–1.00) or moderately peraluminous if highly fractionated (ASI: 1.01–1.06). The geochemistry and petrological features of these I-type granitoids argue for close genetic relationships and it is suggest that they originated from a single parent magma. The observed variability in mineralogy and major and trace element compositions in these granitoids are then the reflection of the fractional crystallization that evolved separation of plagioclase, biotite, K-feldspar and accessory minerals at the level of emplacement. The two mica S-type granitoid is exclusively peraluminous (ASI: 1.07–1.25) and classified as a peraluminous leucocratic granitoid or leucogranite. It is marked in its CIPW normative composition by the permanent presence of corundum, ranging between 0.12 and 3.03. The Bafoussam granitoids were emplaced in a syn- to post-collisional tectonic environment. The observed deformational features and the concentrations in Y, less than 40 ppm, confirm that they are related to an orogenesis. Whole-rock Rb–Sr isochrons defines an igneous crystallization ages of 540 ± 27 Ma for the biotite granitoid and 587 ± 41 Ma for the mega feldspar granitoid. These ages fit with the range of Pan-African granitoid ages (650–530 Ma) in West Cameroon and correspond to the Pan-African D2 deformation event in the Neoproterozoic Cameroon orogenic belt. The two-mica granitoid yields an older Rb–Sr isochron age of 663 ± 62 Ma which is considered to be probably a mixing age. The Nd–Sr isotopic compositions indicate that the I-type granitoids have been produced by partial melting of a tonalite–granodiorite source in the lower crust. This is supported by their initial 87Sr/86Sr(600 Ma) ratios (0.705–0.709) and by their WNd(600 Ma) values (0.2 to –6.3, mainly < 0). The two-mica granitoid was generated by partial melting of a greywacke-dominated source involving biotite-limited, biotite dehydration melting. Chemical data of the two-mica granitoid that support this hypothesis are low CaO/Na2O (0.11–0.38) and Sr/Ba (0.20–0.30), the high Rb/Sr (2.26–7.00), the high initial 87Sr/86Sr(600 Ma) ratios ranging from 0.708 to 0.720, the large range in Al2O3/TiO2 (47–204) and the negative WNd(600 Ma) values (–9.9 to –14.0). Moreover,the higher initial 87Sr/86Sr(600 Ma) ratios of the two-mica granitoid are consistent with an upper crust origin. The depleted mantle Nd model ages (TDM) of 1.3–2.3 Ga indicate that the studied granitoids originated by partial melting of Paleoproterozoic and Mesoproterozoic crust, with limited mantle-derived magma contribution. The high initial 87Sr/86Sr(600 Ma) ratios of these granitoids coupled with the wide negative WNd(600 Ma) values strongly suggest a very long residence time in the crust of their protoliths before the melting event. The petrologic signatures of the Bafoussam granitoids are similar to those described in other Pan-African belts of western Gondwanaland such as the neighbouring provinces of Nigeria and the Central African Republic, as well as in the Borborema Province of northeastern Brazil. This supports the previous hypothesis that the Central African fold Belt including Cameroon, Nigeria and the Central African Republic provinces has a continuation in Brazil.
The genetics of species differences is an outstanding question in evolutionary biology. How do species evolve to become phenotypically distinct and how is the genetic architecture organized that underlie species differences? Phenotypic diverged traits are supposed to be frequently involved in prezygotic isolation, i.e. they prevent the formation of hybrids, whereas postzygotic isolation occurs when hybrids experience a fitness reduction. The parasitic wasp genus Nasonia represents an appropriate model system to investigate the genetics of species differences as well as the genetics of postzygotic isolation. The genus consists of three species N. vitripennis, N. longicornis and N. giraulti that differ particularly in male traits that are assumed to posses an adaptive significance: courtship behaviour and wing size differences. The courtship behaviour consists of cyclically repeated series of head nods that are separated by pauses. The stereotypic performance allowed to split up the display into distinct courtship components. Males of N. vitripennis bear vestigial forewings and are incapable of flight, whereas N. longicornis wear intermediate sized wings and N. giraulti is fully capable of flying. Nasonia species can produce interspecific hybrids after removing Wolbachia bacteria induced hybrid incompatibilities with antibiotics. Postzygotic isolation occurs to different extent and is asymmetric among reciprocal crosses, e.g. inviability is stronger in the N. vitripennis (♀) x N. longicornis (♂) cross than in the N. longicornis (♀) x N. vitripennis (♂) cross. The formation of hybrids allow to study the genetic of species differences in QTL (quantitative trait locus) analyses as well as the genetics of postzygotic isolation causing hybrid inviability. The aim of the study was to investigate the genetic architecture of differences in courtship behaviour and wing size between N. vitripennis and N. longicornis and to assess the genetics of postzygotic isolation to gain clues about the evolutionary processes underlying trait divergence and establishment of reproductive isolation between taxa. In a QTL analysis based on 94 F2-hybrid individuals of an LV cross only few QTL for wing size differences have been found with relatively large effects, although a large proportion of the phenotypic variance remained unexplained. The QTL on courtship behaviour analysis based on 94-F2 hybrid males revealed a complex genetic architecture of courtship behaviour with QTL of large phenotypic effects that explained more than 40 % of the phenotypic variance in one case. Additionally, an epistatic analysis (non-additive interlocus interaction) of courtship QTL revealed frequent genetic interchromsomal relations leading in some instances to hybrid specific effects, e.g. reversion of phenotypic effects or the transgression of phenotypes. A QTL analysis based on a threefold sample size revealed, however, an overestimation of QTL effects in the analysis based on smaller sample size pointing towards a genetic architecture of many loci with small effects governing the phenotypic differences in courtship behaviour. Furthermore, the the study comprised the analysis of postzygotic isolation in the reciprocal crosses N. vitripennis (♀) x N. longicornis (♂) versus N. longicornis (♀) x N. vitripennis (♂) located several loci distributed over different chromosomes that are involved in hybrid incompatibility. The mapping of hybrid incompatibility regions reproduced for the first time the observed asymmetries in the strength of postzygotic isolation in reciprocal crosses of between the more distant related taxa within the genus Nasonia. Stronger postzygotic incompatibilities in the VL cross are supposed to result from the superposition of nuclear-nuclear incompatibilities with nuclear-cytoplasmic incompatibilities, whereas the coincidences of these to types of incompatibilities were found to be much weaker in the reciprocal LV cross.
Platelet interaction with the subendothelium is essential to limit blood loss after tissue injury. However, upon rupture of atherosclerotic plaques, this interaction may result in blood vessel occlusion leading to life threatening diseases such as myocardial infarction or stroke. Among the subendothelial matrix proteins, collagen is considered to be the most thrombogenic component as it directly activates platelets. Platelets interact with collagen, either indirectly through glycoprotein (GP) Ib-V-IX receptor complex, or directly through the major collagen receptor on the platelet surface, GPVI. The work presented here focused on studying the cellular regulation of GPVI. In addition, a possible role for GPVI in thrombus formation induced by atherosclerotic plaque material was investigated and it was found that GPVI plays an important role in this process. Using a recently published mitochondrial injury model, it was found that GPVI contains a cleavage site for a platelet-expressed metalloproteinase. Further studies showed that platelet activation by CRP, or thrombin induced down-regulation of GPIb, but not GPVI. In parallel, cellular regulation of GPV was studied and it was found that GPV is cleaved in vitro by the metalloproteinase ADAM17. In previous studies it was shown that injection of mice with the anti-GPVI mAb, JAQ1, induces GPVI down-regulation, which is associated with a strong, but transient, thrombocytopenia. Using new anti-GPVI mAbs, which bind different epitopes on the receptor, it is shown in this study that GPVI down-regulation occurs in an epitope-independent manner. Further experiments showed that antibody treatment induces a transient, but significant increase in bleeding time. Using different genetically modified mice, it is shown that, upon antibody injection, GPVI is both, shed from the platelet surface and internalized into the platelet. Signaling through the immunoreceptor tyrosine-based activation motif (ITAM) of the FcR chain is essential for both processes, while LAT and PLC2 are essential for the shedding process only. Antibody-induced increase in bleeding time and thrombocytopenia were absent in LAT deficient mice, showing that it is possible to uncouple the associated side effects from the down-regulation process. As antibody-induced GPVI internalization still occurs in LAT and PLC2 deficient mice, this suggests a novel signaling pathway downstream of GPVI that has not been described so far.
This study explores and examines the geomorphology of a large endorheic basin, approximately twice the size of Luxemburg, situated in the Etosha National Park, Namibia. The main focus is directed on how and when this depression, known as Etosha Pan, came into being. Geomorphological investigation was complemented and guided primarily by the application and interpretation of satellite-derived information. Etosha Pan has attracted scientific investigations for nearly a century. Unfortunately, their efforts resulted into two diverging and mutually exclusive views with respect to its development. The first and oldest view dates back to the 1920s. It hypothesized Etosha Pan as a desiccated palaeolake which was abandoned following the river capture of its major fluvial system, the Kunene River. The river capture was assumed to have taken place in the Pliocene/Early Pleistocene. In spite of the absence of fluvial input that the Kunene contributed, the original lake was thought to have persisted until some 35 ka ago, long after the Kunene severed its ties with the basin. The current size of the basin and its playa status was interpreted to have resulted from deteriorating climatic conditions. The opposing view emerged in the 1980s and gained prominence in the 1990s. This view assumed that there were an innumerable number of small pans on the then surface of what later to become Etosha Pan. Since the turn of the Pliocene to Early Pleistocene, these individual pans started to experience a combined effect of fluvial erosion during the rainy season and wind deflation during the dry period. The climatic regime during that entire period was postulated to be semi-arid as today. This climatic status was used to rule out any existence of a perennial lake within the boundary of Etosha since the Quaternary. Ultimately, these denudational processes, taking place in a seasonal rhythm, caused the individual pans to deepen and widen laterally into each other and formed a super-pan that we call Etosha today. Thus the Kunene River had no role to play in the development of the Etosha Pan according to this model. However, proponents of this model acknowledged that the Kunene once fed into the Owambo Basin and assigned the end of the Tertiary to the terminal phase of that inflow. Findings of this study included field evidence endorsing the postulation that the Kunene River had once flowed into the Owambo Basin. Its infilled valley, bounding with the contemporary valley of the Kunene near Calueque, was identified and points towards the Etosha Pan. It is deliberated that a large lake, called Lake Kunene, existed in the basin during the time. Following the deflection of the Kunene River to the coast under the influence of river incision and neo-tectonic during the Late Pliocene, new dynamics were introduced over the Owambo Basin surface. After the basin was deprived of its major water and sediment budget that the Kunene River contributed, it was left with only smaller rivers, most notably the Cuvelai System, as the only remaining supplier. This resulted in the Cuvelai System concentrating and limiting its collective load deposition to a lobe of Lake Kunene basin floor. The accident of that lobe is unclear, but it is likely that it constituted the deepest part of the basin at the time or it was influenced by neo-tectonic that helped divert the Kunene River or both. Against the backdrop of fluvial action that was initiating the new lake, most parts of the rest of the basin, then denied of lacustrine activity, were intermittently riddled with a veneer of sediment, especially during phases of intensified aeolian activity. In the mean time, the area that was regularly receiving fluvial input started to shape up as a distinct lake with the depositions of sediments around the water-body, primarily via littoral action, serving as embankment. Gradually, a shoreline is formed and assisted in fixing and delineating the spatial extent of the new and much smaller lake, called Lake Etosha. That Lake Etosha is the predecessor of the modern day Etosha Pan. Indicators for a perennial lake found in this study at Etosha include fossil fragments of Clariidae species comparable to modern species measuring some 90 cm, and those of sitatunga dated to approximately 5 ka. None of these creatures exist today at Etosha because of their ecological requirements, which among others, include permanent water. The sitatunga, in addition, is known as the only truly amphibious antelope in the world. Since its inception, the new lake underwent a number of geomorphological modifications. A prominent character amongst these modifications is the orientation of the lake, which has its long-axis oriented in the ENE-WSW direction. It resulted from wave action affected by the prevailing dominant northeasterly wind, which is believed to have been in force since the Middle Pleistocene. Lake Etosha has also witnessed phases of waning and waxing under the influence of the prevailing climatic regime. Over the last 150 ka, the available data intercepted about seven phases of high lake levels. These data are generally in agreement with regional palaeoclimatic data, particularly when compared with those obtained from neighbouring Makgadikgadi Pans in Botswana. The last recorded episode of the wet phase at Etosha was some 2,400 years before the present.
The genus Pogonomyrmex is predisposed for analyzing the evolution of ant colony characteristics in general and the sociogenetic structure in particular, due to the renowned biology of several species and the diversity of mating frequency and queen number. This variation in the sociogenetic structure of colonies produces a high variance in intracolonial relatedness which can be a major component driving the evolution of various colony characteristics. To exactly determine the variability of the intracolonial relatedness in the genus Pogonomyrmex both were analyzed, the number of matrilines and patrilines, in selected members of Pogonomyrmex, namely P. (sensu stricto) rugosus, P. (sensu stricto) badius and P. (Ephebomyrmex) pima using DNA fingerprint techniques. The evolution of these colony characteristics were tried to be explained within a phylogenetic framework. For that purpose we constructed a gene-tree of 39 species of the genus Pogonomyrmex. The taxon sampling covered about 83 % of the North American species and 43 % of the South American species. Effective multiple mating of queens was confirmed for P. rugosus (me=4.1) and P. badius (me=6.7). Additionally, both species are monogynous. These results corroborate behavioral observations of multiple mating for these species. Multiple mating is now known from 9 Pogonomyrmex species (behavioral evidence for 3 species – genetic evidence for 6 species). However, in P. (E.) pima all queens that were analyzed were single mated (me=1.0). Therefore, multiple mating may have either evolved early during the evolution of the genus Pogonomyrmex and has subsequently been lost in the subgenus Ephebomyrmex (plesiomorphic hypothesis), or it has first been evolved in the subgenus Pogonomyrmex sensu stricto (apomorphic hypothesis). In P. huachucanus, a species basal to the North- American sensu stricto complex, smaller effective mating number of queens compared to its sensu stricto relatives (J. Gadau and C.-P. Strehl, unpublished) probably do mirror a change from monandry to polyandry during the evolution of more advanced sensu stricto species, which would support the apomorphic hypothesis. The intracolonial relatedness in P. (E.) pima is however rather low. This is probably the result of multiple reproducing queens (polygyny). Polygyny is also documented for at least four other species of the subgenus Ephebomyrex, but so far P. (E.) pima is the only species with genetic evidence. It might be that there was an evolutionary trade-off within the subgenus Ephebomyrmex between polyandry and polygyny. Therefore, both subgenera retained a high intracolonial genetic diversity. This high genetic diversity might be one cause for the success and radiation of the genus Pogonomyrmex in arid environments. Evolution might have favored high genetic diversity of Pogonomyrmex colonies, because it helps colonies to improve their colonial organization and efficiency in performing external tasks. At least in P. badius a link between patrilines and physical polyethism was found, indicative of an improvement of colonial organization via polyandry. Furthermore, the documented extreme levels of polyandry might help P. badius females to overcome the possibility of inbreeding due to restricted dispersal. Restricted dispersal is also found in P. (E.) pima due to wingless, intermorphic queens. However, in P. (E.) pima inbreeding is probably prevented by outcrossing via males because no significant inbreeding is found. In the presented gene trees the subgenus Pogonomyrmex Ephebomyrmex was separated from the subgenus Pogonomyrmex sensu stricto. Therefore, P. Ephebomyrmex might be elevated to generic status, also due to its distinct morphological and life history characters. Nevertheless, for a precise taxonomic revision a broader complement of species has to be applied. Regularly a low number of unrelated workers was found in P. rugosus colonies, which probably stem from brood raids between mature and founding colonies. It is well known that most founding colonies are destroyed by neighboring conspecific mature colonies, but so far it was assumed that the brood of these colonies was also destroyed. This often neglected aspect might be an important fitness token for mature colonies.
Two phases of reef sampling were carried out. The first included regular samples taken along the coastline of Aqaba (27km long) at depths of 4-15m, and used to determine spatial distribution of pollution. The second phase included three 20cm-deep cores obtained from within the industrial zone. These cores were drilled from pre-dated communities, where the growth rate was determined earlier to be 10mm y-1, therefore the core obtained represented a period of 20 years (i.e. 1980-2000). The cores were used to reconstruct the metal pollution history at the most heavily used site along the coast (industrial zone).All samples were examined with respect to their metal content of Cd, Pb, Cu, Zn, Ni, and Cr. Almost all of them have shown records above the calculated background values. Mean values of Cd, Pb, Cu, Zn, Ni and Cr recorded along the coast were 1,25; 4,26; 9,76; 11,40; 2,29 and 10,522, µg g-1 respectively, and for core samples 1.4; 4.2; 5.7; 6.4; 2.3 and 8.21 µg g-1 respectively. Spatial distribution of metal enrichment in reef samples have shown a general and clear increasing trend towards the south. Same increasing trend was also in core samples where the six metals have shown a prominent increasing trend towards the core surface indicating an increase of coastal activities during the last twenty years. High and relatively high values were recorded at the oil port, the industrial area and main port, and thus categorized as highly impacted areas. Intermediate metal content were recorded in samples of the north beach, and thus classified as being relatively impacted, where the lowest metal concentrations were observed at the marine reserve, the least impacted site along the coast. The high enrichment of metal is attributed mainly to anthropogenic impacts. The natural inputs of the six metals studied in the Gulf of Aqaba are generally very low, due to the geographic positions and the absence of wadi discharge and as a result of low rainfall. Several potential sources of heavy metals were investigated. The industrial-related activities, port operations and phosphate dust were among the main sources currently threatening the marine ecosystem in Aqaba. Applying the Principle Components Analysis method (PCA) to all samples taken along the coastline has resulted in categorizing three different groups according to their metal enrichment, the first is composed of samples taken from the north beach and the main port with intermediate to high enrichment, the second joined the samples of the marine park and the marine reserve with low and relatively low enrichment, and the last group joined samples of the industrial zone and the oil port with high enrichment. The Principle Component Scores were also utilized to confirm the spatial distribution and relationships of the examined heavy metals along the coast. Two models (interpolated by SURFER  7.0 and ArcView 3.2a) were developed, the first was based on the PC scores of the first component, and shows clearly the positive anomalies in metal concentrations along the coast. The second model was developed by plotting the second factor scores on a landuse map of Aqaba. According to these models, it has shown that the positive anomalies are associated with three different zones; industrial area, the main port and the oil port. The results have shown that coral reefs can be used as good environmental indicator for assessments and monitoring processes, and they can provide data and information on both the spatial distribution of pollution and their history. The present work is the first to document the environmental status along the whole coast of Aqaba and the first to use coral reef as a tool/ indicator.
Corynebacterium glutamicum is together with C. callunae and C. efficiens a member of the diverse group of mycolic-acid containing actinomycetes, the mycolata. These bacteria are potent producer of glutamate, lysine and other amino acids on industrial scale. The cell walls of most actinomycetes contain besides an arabinogalactan-peptidoglycan complex large amounts of mycolic acids. This three-layer envelope is called MAP (mycolyl-arabinogalactan-peptidoglycan) complex and it represents a second permeability barrier beside the cytoplasmic membrane similar to the outer membrane of Gram-negative bacteria. In analogy to the situation in the outer membrane of Gram-negative bacteria, channels are present in the mycolic acid layer of the mycobacterial cell wall for the passage of hydrophilic solutes. Molecular studies have provided far-reaching findings on the amino acid flux and its balance in C. glutamicum in general, but the L-glutamate export still remains unknown. The properties of the outer layers, typical of mycolata, seem to be of major importance in this process, and diffusion seems to play a key role for this part of the cell wall. The major aim of this thesis was to identify and study novel channel-forming proteins of the amino acid producers C. glutamicum, C. callunae and C. efficiens. Cell wall extracts of the organisms were investigated and a novel pore-forming protein, named PorH, that is homologue in all three organisms, was detected and characterized. PorHC.glut was isolated from C. glutamicum cells cultivated in minimal medium. The protein was identified in lipid bilayer experiments and purified to homogeneity by fast-protein liquid chromatography across a HiTrap-Q column. The purified protein forms cation-selective channels with a diameter of about 2.2 nm and an average single-channel conductance of about 2.5 nS in 1 M KCl in the lipid bilayer assay. Organic solvent extracts were used to study the permeability properties of the cell wall of C. callunae and C.efficiens. The cell extracts contained channel-forming activity, the corresponding proteins were purified to homogeneity by fast-protein liquid chromatography across a HiTrap-Q column and named PorHC.call and PorHC.eff. Channels formed by PorHC.call are cation-selective with a diameter of about 2.2 nm and an average single-channel conductance of 3 nS, whereas PorHC.eff forms slightly anion selective channels with an average single-channel conductance of 2.3 nS in 1 M KCl in the lipid bilayer assay. The PorH proteins were partially sequenced and the corresponding genes, which were designated as porH, were identified in the published genome sequence of C. glutamicum and C. efficiens. The chromosome of C. callunae is not sequenced, but PorHC.call shows a high homology to PorHC.eff and PorHC.glut. The proteins have no N-terminal extension, only the inducer methionine, which suggests that secretion of the proteins could be very similar to that of PorAC.glut of C. glutamicum. PorHC.glut is coded in the bacterial chromosome by a gene that is localized in the vincinity of the porAC.glut gene, within a putative operon formed by 13 genes that are encoded by the minus strand. Both porins are cotranscribed and coexist in the cell wall, which was demonstrated in RT-PCR and immunological detection experiments. The arrangement of porHC.glut and porAC.glut on the chromosome is similar to that of porBC.glut and porCC.glut and it was found that PorAC.glut, PorHC.glut, PorBC.glut and PorCC.glut coexist in the cell wall of C. glutamicum. The molecular mass of about 6 kDa of the PorH channel forming proteins is rather small and suggests that the cell wall channels are formed by oligomers. A possibly hexameric form was demonstrated for PorHC.glut in Western blot analysis with anti- PorHC.glut antibodies. Secondary structure predictions for PorHC.glut, PorHC.call and PorHC.eff predict that a stretch of about 42 amino acids of PorHC.glut and 28 amino acids of PorHC.call and PorHC.eff forms amphipathic -helices with a total length of 6.3 nm and 4.2 nm respectively. This should be sufficient to cross the mycolic acid layer. Another objective of this work was to establish an heterologous expression system for corynebacterial channel-forming proteins, to investigate the channel-forming properties of the up to now only hypothetical porins PorA, PorB, PorC from C. efficiens and PorC from C. glutamicum. We could demonstrate with recombinant expression experiments in E. coli that porBC.eff and porCC.eff encode for channel-forming proteins. They are, like PorBC.glut, anion-selective with a similar single-channel conductance of 1 nS in 1 M KCl.
In a first aspect of this work, the development of photonic crystal based widely tunable laser diodes and their monolithic integration with photonic crystal based passive waveguide and coupler structures is explored theoretically and experimentally. In these devices, the photonic crystal is operated in the photonic bandgap which can be used for the realization of effective reflectors and waveguide structures. Such tunable light sources are of great interest for the development of optical network systems that are based on wavelength division multiplexing. In a second aspect of this work, the operation of a photonic crystal block near the photonic band edge is investigated with respect to the so-called superprism effect. After a few introductory remarks that serve to motivate this work, chapter 3 recapitulates some aspects of semiconductor lasers and photonic crystals that are essential for the understanding of this work so that the reader should be readily equipped with the tools to appreciate the results presented in this work.
Rhodococcus equi is a Gram-positive intracellular pathogen which can cause severe bronchopneumonia in foals. In recent years, the role of this bacterium as human pathogen has been noted, as R.equi infections in humans have increase in frequency. This increase is associated with the rise in immunosupressed individuals, specially AIDS patients, where infection leads to symptoms and pathology similar to those seen in foals with a high mortality rate. Due to its capability to survive and multiply in murine and equine macrophages, R.equi has been classified as a facultative intracellular bacterium. R.equi is found frequently in macrophages in alveolar infiltrate from infected animals. The pathogenicity of R.equi depends on its ability to exist and multiply inside macrophages and has been associated with the presence of virulence plasmids. It has been observed that, inside foal alveolar macrophages, R.equi-containing vacuoles (RCVs) do not mature into phagolysosomes. However, most of the intracellular events during R.equi infection have not been investigated in detail. The aim of this study was to elucidate the intracellular compartmentation of R.equi and the mechanism by which the bacteria avoid destruction in host macrophages. The importance of the virulence-associated plasmids of R.equi for the establishment of RCVs was also evaluated. Furthermore, the intracellular fate of viable and non-viable R.equi was compared in order to study whether viability of R.equi influeciantes the establishment of RCVs. In this study, the RCV was characterized by using a variety of endocytic markers to follow the path of the bacteria trhough murine macropages. Transmission electron microscopy-base analysis showed that R.equi was found equally frequently in phagosomes with loosely or thightly apposed membranes, and RCV often contains numerous membranous vesicles. Laser scanning microscopy of infected macrophages showed that the majority of phagosomes containing R.equi acquired transiently the early endosomal markers Rab5, Ptlns3P, and EEA-1, suggesting initially undisturbed phagosome maturation. Although the RCV acquired some late endosomal markers, such as Rab7, LAMP-1, and Lamp-2, they did not acquired vATPase, did not interact with pre-labeled lysosomes, and failed to acidify. These data clearly suggest that the RCV is a compartment which has left vacuoles that resemble multivesicular body compartments (MVB), which are transport intermediates between early and late endosomes and display internal vesicles very similar to the ones observed within RCVs. Analyisis of several R.equi strains containing either VapA- or VapB-expressing plasmids or neither demonstrated that the possession of the virulence-associated plasmids does not affect phagosome trafficking over a two hour period of infection. The finding that non-viable R.equi was still able to inhibit phagosome maturation (although not to the same extent as viable R.equi did) suggests that heat-insensitive factors, such as cell periphery lipids, may play a major role in inhibition of phagosome maturation, although heat-sensitive factors may also be involved.
Nonlinear frequency conversion of low-energy fs laser pulses was investigated in solid-state media. Raman conversion in the white-light-free regime of impulsive stimulated Raman scattering was achieved by pumping KGW crystal with Bessel beam. Efficient supercontinuum generation was demonstrated for sub-microjule pulses focused into microstructure fiber. Application of four-wave mixing techniques to monitoring of the excited-state dynamics in polyatomic molecules was demonstrated. Time constants of the processes related to vibrational energy redistribution upon the initial photoexcitation of stilbene-3 were determined by means of pump-CARS technique, where CARS process served as an effective mode-selective filter. Spectral as well as temporal properties of electronic relaxation pathway in azulene derivatives were explored by using transient population gratings and pump-probe transient absorption techniques.
Very small, thioglycerol (TG)-capped CdS nanoparticles were synthesized by a wet chemical technique and investigated in the framework of this thesis. Also glutathione-capped particles were investigated for a comparison of the capping agents. High-resolution photoelectron spectroscopy using high-brilliance synchrotron radiation was applied as the major tool for the characterization of these particles. Additionally, the particles were investigated with UV-VIS absorption spectroscopy, XPS using a laboratory source, valence band photoemission spectroscopy (VBPES), near-edge x-ray absorption spectroscopy (NEXAFS), and micro-Raman spectroscopy to address various aspects of the particles. In the beginning, an overview on size quantization effects is given to create a theoretical background behind the work presented in this thesis. Furthermore, an overview of various conventional techniques for size determination is presented. Exact information about size, shape and size distribution of nanoparticles is not yet achievable because of experimental limitations of the various size determination methods. Nanoparticles, with a range of sizes from 1.1 to 4. 2 nm, were synthesized using non-aqueous preparation and a TG capping. It is demonstrated that the use of the non-aqueous wet chemical synthesis method enables the production of very small particles and prohibits the aging of the particles. Furthermore, TG capping leads to a significant improvement for a narrow size distribution. Moreover, the results are very reproducible with TG capping and non-aqueous synthesis. Monodispersed particles can be produced by a size selective precipitation method, however, the reproducibility is questionable due to the aqueous medium of the synthesis in this case. High-resolution photoemission measurements on the small particles, i.e., 1.1 nm (CdS-A), 1.4 nm (CdS-B), 1.7 nm (CdS-C), and 1.8 nm (CdS-D, glutathione-capped), revealed five components as constituents of the S 2p signal after a careful data evaluation. Furthermore, it was observed that the particles with different sizes and capping show differences in the photoemission spectra and also in the beam damage behaviour. The different components of CdS-B were assigned as S atoms with different Cd neighbors, S atoms from thiol and S atoms in a partially oxidized state, based on the observed intensity changes of these components as a function of photon energy and beam damage, and on previous photoemission work on CdS nanoparticles [23, 45]. Furthermore, it was found that this assignment cannot be directly transferred to other particles. A new approach of structural model-based photoemission intensity calculations in comparison with the experimental data is presented. This enables us to understand subtle features in the photoemission spectra, in particular the intensity changes of the different components as a function of photon energy and beam exposure. This approach is especially applied to CdS-B (as some structural information for this particle is avialable from XRD), using three different structural models. It is found that a structural model with 33 S atoms can explain the experimental intensity changes of CdS-B. Furthermore, it is found that the photoemission spectra can be used to determine the particle size indirectly, as other plausible models show significant deviation from the experimental data. To study the various aspects by calculations, such as the influence of the particle shape and of the value of the mean free path, a program developed with L. Weinhardt and O. Fuchs is used for the intensity calculations. In order to determine a reasonable value of the mean free path for the used photon energies, two different equations from previous reports (Seah et al. and Powell et al.) are applied. As average mean free path values for the two photon energies we chose 5.5 ± 2 Å (254 eV) and 14 ± 2 Å (720 eV). The program calculation confirms the result of simple “manual” calculations of the different models. Moreover, it is tested that the value of , used in the calculations does not produce any significant influence on the calculation results. Another interesting feature is derived from the calculations that a model with a rather round shape produces similar intensity ratios for the different components to those of the data. Thus this new approach of analysis of photoemission spectra offers a way to determine particle sizes and to some extent to give an impression of the approximate particle shape. Furthermore, it is observed that the electronic band gap is larger compared to the optical band gap, which was attributed to an enhanced electron-hole correlation for optical absorption in small particles. The XPS experiments performed in the laboratory using an x-ray tube, show that the thin films produced from a freshly synthesized nanoparticle solution are fairly homogeneous and non-charging. Moreover, annealing experiments indicated that TG-capped particles posses less thermal stability as compared to MPA-capped particles. It was demonstrated that beam-induced effects play a major role. However, the knowledge of the time scale for such effects gives the possibility to record photoemission spectra with fairly good signal quality and to extrapolate to zero radiation damage. Further, particles with different sizes and capping show different beam damage behaviour. The thin film preparation by electrophoresis results in significant changes in the spectrum indicating agglomeration, while the drop-deposition technique points towards spectral changes on the rim of the sample, which can be avoided by focusing the radiation to the centre of the deposited dried drop. Micro-Raman experiments carried out in collaboration with C. Dem, Dr. M. Schmitt and Prof. W. Kiefer exhibited major differences in the spectra of nanoparticles as compared to those of the capping molecule thioglycerol. For instance, the absence of the S-H vibrational modes indicates the consumption or removal of all unreacted capping molecules. There is definitely a need for further detailed investigations concerning various interesting aspects of this work. For instance, it would be of significance to extend the program calculations to more models. Also more information about the band gap opening has to be gathered in order to find out the reason for the larger electronic band gap as compared to the optical band gap. The photoemission analysis approach using a model calculation has to be extended to differently prepared nanoparticles, in particular, to address the differences in the location of the various species in the particle as a function of preparation. The efforts of XRD simulations by C. Kumpf et al. [50] may reveal significant new information about the particle size and the size distribution. It can be expected that the program calculations, if extended to more models, can prove the potential of photoelectron spectroscopy to serve as a tool for size and shape determination of nanoparticles, which is a new contribution to the investigation of nanoparticles.
Within the studies concerning metallo-silanols, halfsandwich-tungsten complexes have been silanol-functionalized at the cyclopentadienyl ligand. The stability and the condensation behavior have been investigated. Thus, it was shown that these complexes are stable enough for isolation but they are reactiv enough for time-effective condensation reactions with diverse chlorosilanes, chlorostannanes or metalhalogenides. These processes are characterized by an increased reactivity in contrast to metallo-silanols with a direct metal-bonded silanol group and proves that the separation of the silanol group has to be regarded as a successful manipulation. In addition, this modification allows a wide variation of the ligand sphere of the metal which was shown by H/Cl exchange, methylation, silylation or phosphine substitution. These changes evoke a small but significant influence on the silanol group. For example leads an introduced phosphine to an enhanced stability of the silanol function. A further separation of the silanol group from the metal by an additional alkylidene spacer leads to the complete lost of the stabilizing effect of the metal fragment and generates silanols which show a condensation behavior very similar to those of ordinary organosilanols.
Protein kinase B (PKB), a serine threonine kinase, is highly involved in the regulation of cellular proliferation and survival. To characterize PKB’s function in lymphocyte development and activation, transgenic (tg) mice that express a membrane targeted constitutively active form of PKBa (myr PKB) in T and B cells were analysed. Thymocytes from myr PKB tg mice showed enhanced proliferation after T cell receptor (TCR) engagement compared to wild type (wt) mice. Astonishingly, myr PKB tg thymocytes were capable to proliferate in response to PMA only and were also less sensitive to inhibition by the calcineurin inhibitors CsA or FK506, which indicates the proliferative response of myr PKB tg T cells is relatively independent of calcium mobilisation and calcineurin activity. In addition, when TCR signalling was inhibited by the MEKinase inhibitor PD98059 or the Srckinase inhibitor PP1 myr PKB tg thymocytes again were more resistant to inhibition. Western blot analysis revealed myr PKB enhances activation of the kinases Lck, Raf and Erk after TCR/CD3 stimulation. Thus, myr PKB renders proliferative responses of thymocytes more sensitive to TCR signals by positive regulation of the Lck-Raf-MEK-Erk signalling pathway. Studies on the cellular location of the tg protein showed myr PKB is located in membrane socalled “lipid rafts”. Furthermore, we found that after TCR/CD3 ligation endogenous cytoplasmic PKB moves into “lipid rafts”, which highlights PKB as a crucial mediator of TCR proximal signalling events. Analysing three different TCR tg model systems for positive and negative selection of immature precursors in the thymus, we found myr PKB promotes positive selection of CD4+ but not CD8+ T cells. This most likely results from PKB’s positive cross-talk on Lck-Raf-Erk signalling, which is known to influence thymocyte selection and CD4/CD8-lineage choice. Furthermore, myr PKB enhances phosphorylation of glycogen synthase kinase 3 (GSK3), a negative regulator of the transcription factor NFAT (nuclear factor of activated T cells) and T cell activation, and of the adapter protein c-Cbl. Concerning negative selection, myr PKB enhanced (OT1 mice), reduced (HY mice) or had no influence (OT2 mice) on negative selection. Thus, myr PKB’s effect on negative selection strongly depends on the model system analysed and this most likely results from differences in TCR affinity/avidity and TCR specificity for MHC. 106 Peripheral CD4+ T cells from myr PKB tg mice showed enhanced production of both Th1 and Th2 cytokines. Furthermore, after TCR/CD3 stimulation in the presence of TGF-b1, wt CD4+ T cells showed a drastic inhibition of proliferation, whereas myr PKB tg CD4+ T cells proliferated even better, i.e. they were resistant to the inhibitory TGF-b1 signals. Expression of myr PKB in B cells leads to reduced Ca2+ flux and proliferation after BCR stimulation, but activation of Lyn, SLP-65, c-Cbl and GSK-3 were enhanced. When we analysed B cell subsets in myr PKB tg mice, a decrease in immature and mature B cells became obvious, whereas cell numbers for marginal zone (MZ) B cells were normal. In aged myr PKB tg mice we detected a very strong reduction of pro/pre and immature B cell populations in the bone marrow, indicating PKB is very important for maintenance of B cell development. Furthermore, myr PKB also lead to a strong reduction of peritoneal B-1 cells. However, expression of NFATc1, which is required for B-1 cell development, was comparable between wt and myr PKB tg B-1 cells. To analyse the effect of myr PKB on immunoglobulin production, mice were immunized with thymus dependent (TD) and independent (TI) antigens. In both cases, B cell responses were strongly elevated in myr PKB tg mice. Finally, RT-PCR analyses of in vitro expanded B cells revealed increased Blimp-1 and Notch3 expression in myr PKB tg B cells, which might be primary candidates involved in their enhanced effector function. In summary, this study clearly shows an important cross-talk between PKB and various critical signalling molecules downstream of the TCR and BCR. Thereby active PKB modulates and regulates the thresholds for thymocyte selection and T cell activation as well as for B cell development and function.