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The main objective of this work is to contribute to the understanding of the grafting of nitrogen and amino surface functional groups on polymers by means of plasmas containing nitrogen and hydrogen. For this purpose, many aspects of plasma surface modification were studied. In the frame of this work, a new, UHV-sealed plasma reactor system was put into operation. The system is special for its clean reaction environment and the possibility to perform quasi in situ XPS measurements. A comparison of the UHV system to a fine vacuum reactor showed that a clean reaction environment is mandatory for reproducible plasma processing and efficient nitrogen and amino functionalisation. A key motivation for the present work was the observation that the non-coating plasma processes reported in literature fail to graft primary amino groups on polymer surfaces with densities that significantly exceed 3 - 4% NH2/C. In order to investigate this phenomenon in detail, this work followed two experimental tracks: On the one hand, a broad systematic study of plasma processing parameters was performed. On the other, the surface diagnostics methods used for the quantification of amino groups were critically reviewed. For this, a numerical algorithm was developed to reconstruct the element depth profile from angle-resolved XPS data. In the scope of the process parameter study, cw and pulsed microwave (MW) plasma excitation was compared to radio-frequency (RF) excitation. The home-built MW source was studied and optimised with respect to ignition behaviour and power efficiency. The performance of the MW and RF plasmas in polymer surface modifications was studied in various gas mixtures containing NH3 and H,, or N2 and H,. Also the differences of glow and afterglow processing of polymers were investigated. Large variations of the nitrogen and primary amino grafting efficiencies were obtained. They triggered a number of new ideas for the underlying reaction mechanisms. Special attendance was devoted to the selectivity of the functionalisation processes for primary amino groups. Nitrogen-containing discharges that were rich in hydrogen achieved selectivities up to 100%. The upper limit of 3 - 4% amino groups on the surface, however, was not passed. Angle-resolved XPS measurements revealed a systematic problem for the definition of a surface density, which is capable of explaining the upper limit for amino groups. It is either due to a limited labelling depth of amino groups by the applied TFBA derivatisation reaction, or to a limited functionalisation depth of the plasma process. One very efficient nitrogen-grafting plasma process that was developed on polystyrene was applied to seven other unfluorinated polymers. The similarity of the resulting functionalisation demonstrated a good transfer-ability of plasma surface functionalisation processes. Plasma treatments of polymer surfaces, especially in hydrogen-containing gases, are known to be generally followed by uncontrollable oxidation phenomena. The properties of plasma-functionalised polymer surfaces were therefore studied in conjunction with ageing effects. Quasi in situ XPS analysis allowed to distinguish the influence of oxygen contamination during the plasma process from post-process oxidation due to contact of plasma-treated samples to atmospheric oxygen. The surface modification experiments were accompanied by several gas phase diagnostic techniques. In the scope of this work, the UHV reactor system was equipped with optical emission spectroscopy (OES), two-photon absorption laser-induced fluorescence (TALIF), and tunable diode laser absorption spectroscopy (TDLAS). A separate plasma source was setup to perform an absolute quantification of the vacuum-ultra-violet (VUV) emission intensity of hydrogen-containing MW-excited plasmas. The techniques were evaluated with respect to their contribution to an understanding of the plasma processing of polymers. The rich experimental data allowed to suggest new reaction mechanisms for the grafting of nitrogen- and amino functional groups. Surface passivation experiments in H, plasmas of nitrogen-functionalised surfaces initiated a re-evaluation and an extension of the mechanism of selective etching [1]. Together with two other new reaction mechanisms, a hypothetical reaction scheme was suggested. It was studied by the help of two numerical models for heterogenous reactions of radicals with the surface. In order to avoid the complexity of the fragmentation process of NH,, the models were restricted to discharges in N, and H9. Despite the sparse information on the composition of the gas phase, the data of two experimental series showed a very particular phenomenology that allowed a first test of the model. The test supports the newly-suggested reaction mechanisms. Especially the role of NH2 attachment to open reaction sites for the grafting of amino groups was emphasised. A more stringent test of the model is left to future experiments with extended gas phase diagnostic means.
We improved our previous model of tracheal tube preparation and examined the effects of oral treatment of rats with carbocisteine (CCS) and its interaction with bronchial epithelium. The model permitted isometric or isotonic measurements of smooth muscle contraction or relaxation in cannulated or tracheal ring preparations, with or without epithelium. We found that oral treatment with carbocisteine and not preincubation of preparations in vitro, diminished sensitivity of preparations without epithelium to carbachol (EC50, -log(M) values: IN -luminary perfusion, -EP, controls vs. CCS: 5.8±0.06 vs. 5.5±0.09, p<0.005; OUT - serosal perfusion, -EP, controls vs. CCS: 5.9±0.06 vs. 5.6±0.05, p<0.005), while the sensitivity to aminophylline, degree of shortening, and the velocity of contraction of rat tracheal rings stimulated by 10-6M carbachol was not affected. Normal sensitivity to carbachol stimulation was re-established if preparations were preincubated with capsaicin. We conclude that carbocisteine has small inhibitory effects on the sensitivity to carbachol of the rat tracheal smooth muscle denuded of epithelium. Described model is valuable for examining the effects of bronchial epithelium on bronchial smooth muscle contraction.
In the thesis the reason for the low breeding success of white rhinos in captivity was investigated and solutions suggested. It was also investigated how to improve management of free ranging populations. It was establish whether female white rhinoceros choose their mates and, if so, which factors influence their choice. The study also seeks to establish whether there is any relationship between androgens, environmental factors and mating activity. The study was carried between March 1997 and May 1999 on a private game farm in South Africa. The study animals enjoyed conditions similar to those enjoyed by free-ranging populations. A non-invasive endocrine monitoring technique was developed to assess the androgen concentrations in faeces of male white rhinos. The body and horn size of adult males was measured, the concentration of testosterone in their faeces determined, and the characteristics of their territories investigated. All of these factors were then set in relation to their reproductive success. The reproductive success was established by genetic analysis of fatherhood using AFLP methods. The quality of male territories was described by vegetation structure, tree and grass species composition, the availability of frequently foraged or selected grass species as well as the nutritional composition of the forage. In addition, the influence of seasonal rainfall, presence of receptive females and territorial activity on androgen metabolite concentrations was established.
The present experimental work investigates plasma turbulence in the edge region of magnetized high-temperature plasmas. A main topic is the turbulent dynamics parallel to the magnetic field, where hitherto only a small data basis existed, especially for very long scale lengths in the order of ten of meters. A second point of special interest is the coupling of the dynamics parallel and perpendicular to the magnetic field. This anisotropic turbulent dynamics is investigated by two different approaches. Firstly, spatially and temporally high-resolution measurements of fluctuating plasma parameters are investigated by means of two-point correlation analysis. Secondly, the propagation of signals externally imposed into the turbulent plasma background is studied. For both approaches, Langmuir probe arrays were utilized for diagnostic purposes. The main findings can be summarized as follows: Greatly elongated fluctuation structures exist in plasma edge turbulence. The structures are aligned along the confining magnetic field (k|| = 0). The correlation degree of fluctuations for a short connection length of 0.75m is greater than 80%. For much longer connection lengths of 23m and 66m, the correlation degree is reduced to approximately 40%. A conceptual interpretation of these observations is the coexistence of two different fluctuation components. One component has a correlation length parallel to the magnetic field below 20m and the other component a correlation length greater than 70m. Sine signals in the frequency range 1-100 kHz were injected into the turbulent plasma background. The propagation parallel and perpendicular to the magnetic field of the signals was studied. In poloidal direction, an asymmetry is observed, that can be explained by a copropagation of the signal with the background E × B-rotation of the plasma. The signal propagation parallel to the magnetic field shows no such asymmetry. As an advanced approach, spatio-temporal wave patters were injected into the edge plasma. The waves launched that way can be seen as test waves' in a turbulent background. The coupling strength of the imposed wave patterns to the background turbulence relies on the match of the imposed waves to the dynamics of turbulent structures. If the propagation direction of the imposed waves is parallel to the propagation direction of the background plasma, improved coupling is observed. This finding underlines the importance of the background plasma rotation for future attempts of controlling the plasma edge turbulence. Further optimization of frequency and wave vector of the imposed waves is probably a promising approach for achieving a significant and systematic influence of turbulence. Taking into account the present experimental state-of-the-art, for a deeper insight into the mechanism of the plasma edge turbulence of magnetized high-temperature plasmas a joint effort of numerical modeling and experimental results is a valuable approach. Such a cooperation should cover the explanation of the correlation observations as well as the experiments on signal injection into background turbulence. A quantitative comparison between the results presented in this work and a dedicated numerical drift wave simulation would be a significant step forward to a better understanding of plasma edge turbulence.
Until today most social, historical and cultural studies of the American postwar era have contributed to the myth of a relatively homogeneous society and culture. Even though they understood these years as a turning point for modern American society, they failed to encompass the polyvalence and heterogeneity of American society. Focussing mostly on white and middle class males, these studies formed a onedimensional picture of sociocultural conformity, a picture in which issues of gender, race and class were largely absent. Crossing the boundaries of feminist, cultural and historical studies this dissertation starts from identifying the gaps and problems in current academic research. Those sociopolitical structures that affected non-white women are then juxtaposed with the dominant postwar discourse of womanhood. The literary texts by women of color show them grappling with the conflicting demands of socioecnomic realities and pervasive role definitions. On the surface these literary interventions seemed to submit to dominant ideologies while opposing them at the same time. Thus they are both anticipatory and antagonistic. The dissent and criticism in writings by women of color seem to have become a catalyst for the deep social transformations in the following decades.
Studies of stroke in experimental animals have demonstrated the neuroprotective efficacy of a variety of interventions; however, most such strategies have failed to show clinical benefits in aged humans. One possible explanation for this discrepancy between animal and clinical studies may be the role that age plays in the recovery of the brain following insult. For example, the poor functional recovery of aged rats after stroke may be caused by a decline in brain plasticity. Although the incidence of ischemic stroke increases dramatically with advancing age, relatively few studies have been conducted on aged animals, which would mimic most closely the context in which stroke occurs in humans. We have shown that, at one week following stroke, there was vigorous expression of MAP1B and its mRNA, as well as MAP2 protein, in the border zone adjacent to the infarct of 3 month- and 20 month-old male Sprague Dawley rats. Hypothesis: The decline in brain plasticity is caused by an age-related decline in the upregulation of factors promoting brain plasticity (MAP1B, ßAPP) and an age-related increase in astroglial scaring and in the expression of neurotoxins such as beta amyloid. Methods: Focal cerebral ischemia was produced by reversible occlusion of the right middle cerebral artery in 3- and 20-month-old male Sprague Dawley rats. The functional outcome was assessed in neurobehavioral tests at 3, 7, 14, and 28 days post-stroke. At these time points, brains were removed and analyzed for markers of (i) brain plasticity (microtubule-associated protein 1B, MAP1B, secreted forms of fi-amyloid precursor protein); (ii) neurogenesis (BrdU-positive cells, doublecortin, nestin); (iii) neurotoxicity (B-amyloid aggregates); (iv) inflammation (microglia, astrocytes, oligodendrocytes, endothelial cells). Results: (1) There was a non-significant tendency for blood pressure to be higher in old than in young rats. By post-stroke day 3 the infarct volume covered about 15% of the cortical neurons in young and 28% in aged rats. By day 7, infarct volumes were roughly equal in the two age groups. (2) Cell counting showed increases in the number of BrdU-positive cells in the infarcted area of old rats at day 3 post-stroke. This increase became even more dramatic at day 7 post-stroke in aged rats. There was no significant contribution of apoptosis to cell death. (3) Behaviorally, young rats recovered gradually and reached a maximum of 90% of baseline performance at day 14, post-stroke while the aged rats recovered only to a maximum of 70% of pre-surgery performance by week 2 post-stroke, and remained at that level. (4) The temporal pattern of recovery correlated well with the expression of growth-associated phenotype of ßAPP as well as with MAP1B accumulation in varicosities along axons (an indicator of growth) in cortical areas affected by stroke and was at maximum between days 14 to 28 in young rats. In contrast, aged rats showed delayed (day 28) and reduced axonal remodelling as well as a delayed (day 28) expression of growth-associated ßAPP. Instead, the neurotoxic carboxy-terminal form of ßAPP steadily accumulated over time and reached a maximum at day 14 in aged rats as compared to 28d for the young rats. Nestin, a marker for immature neurons, overlapped with BrdU-labelled cells at day 7 post-stroke in corpus callosum and at the infarct border in both young and aged rats, suggesting increased stroke-induced neurogenesis. (5) In young rats there was a gradual activation of both microglia and astrocytes that peaked by days 14 to 28 with the formation of a glial scar. In contrast, aged rats showed an accelerated astrocytic and microglial reaction that peaked in week 1 post-stroke. We also noted a strong activation of oligodendrocytes at early stages of infarct development in all rats that persisted in aged rats. Evolution of astrocytic and microglial reactivity closely paralled the time course of scar formation in both young and aged rats and coincided with the stagnation in the recovery rate of aged rats. Conclusions: The time course of functional recovery in young rats correlated well with the expression of plasticity proteins such as MAP1B and ßAPP while an early and persistent expression of the neuro toxic fragment AB in conjunction with a delayed expression of MAP1B and ßAPP may impede functional recovery in aged rats. The results also suggest that a temporally anomalous glial reaction to cerebral ischemia in aged rats leads to the premature formation of scar tissue that impedes functional recovery to stroke.
Serbian Tertiary ultrapotassic province is part of widespread but not voluminous basaltic magmatism in Serbia. Two principal groups of ultrapotassic rocks are recognized; the lamproite affinity group (LAG) and the kamafugite affinity group (KAG). My results demonstrate three dominant low-pressure evolutional processes: magma mixing and fractional crystallization, analcimization and heteromorphism. The two suites of ultrapotassic rocks show large ranges of Sr and Nd isotopic values but a restricted variation of Pb isotopes. LAG is characterized by wide ranges of Sr and Nd isotopes (87Sr/86Sri 0.70735- 0.71299, 143Nd/144Ndi 0.51251-0.51216). KAG is isotopically homogeneous with a limited range of Sr-Nd isotopes (87Sr/86Sri 0.70599-0.70674, 143Nd/144Ndi 0.51263-0.51256). The Pb isotope compositions of both groups are similar (206Pb/204Pb 18.581-18.832, 207Pb/204Pb 15.624-15.696 and 208Pb/204Pb 38.744-38.987), and fall within the pelagic sediment field resembling Mesozoic flysch sediments from the Vardar ophiolitic composite suture zone. Highly variable Sr and Nd isotopic signatures of primitive-LAG rocks correlate with REE fractionation and enrichment of the HFSE. I explain this correlation using vein+wall-rock melting model, invoking the presence of different metasomatic domains (veins with phlogopite, Cpx and F-apatite) that are out of isotopic equilibrium with the peridotite wall rock. Relatively uniform Sr and Nd isotopic data of KAG rocks, similar trace element patterns and small but regular variations of HFSE ratios, indicate different degrees of melting of a relatively homogeneously metasomatized mantle source. Geochemical modelling implies the role of phlogopite, apatite and Ti-oxide in their mantle source.
Challenge of immunized mice with H. pylori induces protective gastric inflammation that is histologically indistinguishable from chronic H. pylori-associated gastritis in non-immune mice. To identify mechanisms of protective immunity gene expression in the gastric tissue from infected mice and mice vaccinated prior to challenge was compared by DNA array analysis. Message RNA was used to screen over 10,000 murine genes. Major Histocompatibility Complex antigens and IFN-γ dependent GTP binding proteins were strongly upregulated in both infected and immunized/challenged mice compared to naive controls. Differences in gene expression were also observed in novel T cell genes, which were exclusively upregulated in immunized/challenged mice. Both IFN I and II associated genes like the IFN-a/ßreceptor or IFN dependent transcription factors mIRF-1 and ISGF3 were also predominantly expressed in this group. These results were confirmed for several candidate genes by semi-quantitative RT-PCR. Additionally, H. pylori-stimulation of CD4+ T cells from immune mice induced significantly more IFN-γ production than stimulation of cells from infected mice. The present study provides evidence that the inflammatory infiltrate that arises in the gastric mucosa when immunized mice are challenged with H. pylori is associated with specific T cells sets and protein families that are distinct from those present in Helicobacter-associated chronic inflammation. Gene array profiles and in vitro assays indicate that immunized mice are more readily poised than infected mice to promote IFN-γ production and IFN related events and thus promote a strong proinflammatory THi response. This study supports recent findings that an immune response dominated by THi cytokines is essential for protection from H. pylori infection. This insight could facilitate the choice of the appropriate adjuvants for the development of vaccines against H. pylori, which are efficient and safe for use in humans. The mechanisms by which THi cells induce protective immunity or reduce Helicobacter colonization remain poorly understood and will be subject of future research.
Within the scope of this work, a versatile large linear magnetised plasma experiment was designed, constructed, and subsequently put into operation. The magnetised plasma was used to investigate the dispersion of whistler waves (circular polarised electromagnetic waves) with regard to the influence of the plasma boundaries. After a brief review over electromagnetic plasma waves and the three discharge modes of a helicon source, the experimental device and the diagnostic tools are explained in detail. Great attention is devoted to the identification of a reliable, calibrated magnetic fluctuation probe design. To the understanding of dynamical phenomena in ionospheric plasmas, whistler wave measurements in laboratory experiments may contribute significantly because of the ability to vary plasma parameters and to do measurements with high spatial and temporal resolution. However, the boundaries of laboratory experiments change the dispersion behaviour of whistler waves significantly if compared to the unbounded ionospheric situation. The influence of the plasma boundary is studied in the present work on three different levels of increasing complexity. First, a high density, small wavelength regime is established to make the effect of the boundary negligible. Measurements are in full agreement with whistler wave theory for unbounded plasma geometry. Measurements below the ion cyclotron frequency reveal the strong influence of the ion dynamics on whistler wave propagation, but are not straightforward to interpret in terms of dispersion theory. Second, the other limit case is examined: bounded plasma helicon modes. These waves are, mathematically speaking, eigenfunctions of the plasma-boundary system and are of great practical importance for high density plasma discharges, the helicon source. Careful measurements of the equilibrium plasma parameters as well as the magnetic fluctuation profiles of the helicon source are done in all three modes of operation, the capacitive, inductive, and helicon wave sustained mode. The first two modes are fairly well understood and the measurements are consistent with existing models. The high density helicon mode, however, is still a scientific case. The measurements partially confirm existing assumptions. It is demonstrated that the plasma production is detached from the antenna edge region. Moreover, it is shown that the plasma parameters are self-consistently determined by the antenna geometry and the discharge parameters according to basic helicon wave theory. Finally, it is ruled out that the plasma density is the control parameter determining the transition point into the high density helicon mode. The measurements rather suggest that the rf power density is the important value. As a third aspect, whistler waves in an intermediate wavelength regime are studied and the transition from unbounded to bounded plasma wave dispersion is systematically investigated. It is shown both experimentally and numerically that the wave dispersion in a plasma filled metal waveguide cannot be determined solely from wave vector measurements parallel to the magnetic field. For a correct description, the perpendicular mode profile has to be correctly taken into account. In contrast to simple helicon wave theory, it is demonstrated that the perpendicular mode profile is not only determined by the conducting vessel boundaries alone but the entire plasma-boundary system has to be considered as a unity. To summarise, this work has contributed to a better understanding of the physics of the propagation of whistler waves, where the particular role of metal boundaries acting as wave guides was highlighted. This basic science approach to the waves' dynamics is believed to be of significance in the course of the scientific debate on the physics principles of helicon discharges.
Two main aspects concerning drift wave dynamics in linear, magnetized plasma devices are addressed in the work: In part I of the thesis, drift waves are studied in a helicon plasma. The plasma parameter regime is characterized by comparably high collision frequencies and comparably high plasma-p exceeding the electron-ion mass ratio. Single Langmuir probes and a poloidal probe array are used for spatiotemporal studies of drift waves as well as for characterization of background plasma parameters. The main goals are the identification of a low-frequency instability and its major destabilization mechanisms. All experimentally observed features of the instability were found to be consistent with drift waves. A new code, based on a non-local cylindrical linear model for the drift wave dispersion, was used to gain more insight into the dominating destabilzation mechanisms, and also into dependencies of mode frequencies and growth rates on different parameters. In the experiment and in the numerical model, poloidal mode structures were found to be sheared. Part II of the thesis reports about mode-selective spatiotemporal synchronization of drift wave dynamics in a low-P plasma. Active control of the fluctuations is achieved by driving a preselected drift mode to the expense of other modes and broadband turbulence. It is demonstrated that only if a resonance between the driver signal and the drift waves in both space and time is reached, the driver has a strong influence on the drift wave dynamics. The synchronization effect is qualitatively well reproduced in a numerical simulation based on a Hasegawa-Wakatani model.
Severe trauma results in alterations in immune functions, correlated with a dysbalanced cytokine synthesis. This imbalance endangers severely injured patients for post-traumatic complications such as MODS, liver failure, renal dysfunction and ARDS. IL-10, a powerful immunosuppressive cytokine, plays a central role in the immune response after severe trauma. The relevance of IL-10 for single and multiple organ failure was studied in a prospective study at a level I trauma center. Blood was systematically obtained from a total of 118 severely injured [median (IQR) ISS=34 (27-34)] patients. IL-10 plasma levels were measured by ELISA. Patients showed elevated IL-10 levels throughout the whole observation period of 5 days. IL-10 plasma levels rose rapidly after trauma and gradually declined towards day 5. Patients who developed complications demonstrated significantly elevated IL-10 levels compared with patients who did not. The odds of developing MODS were 9.6 times greater in patients with IL-10 plasma levels higher than 124 pg/mL 6 hours after arrival at the ICU. Multivariate analysis showed that IL-10 plasma levels >124 pg/mL at time-point 6h, severe head injury and an arterial pH <7.34 were simultaneously significant predictors of the development of MODS in severely injured patients. The dynamic with rapid increase and gradual decline in IL-10 plasma levels indicated that IL-10 is a marker of the initial damage to the organism caused by trauma, rather than a marker of somatic dysregulations.
The present work consists of four parts, containing experimental data obtained from analysis of 'Bacillus subtilis' specific and general defense strategies against reactive oxygen species. In the first part, the peroxide and superoxide stress stimulons ob 'B. subtilis' were analyzed by means of transcriptomics and proteomics. Oxidative stress responsive genes were classified into two groups: the gene expression pattern was either similar after both stresses or the genes primarily responded to one stimulus. The high induction observed for members of the PerR-regulon after both stimuli supported the assumption that activation of the peroxide specific PerR-regulon represented the primary stress response after superoxide and peroxide stress. The second part focuses on protein carbonylation in 'B. subtilis' wild-type and 'sigB' mutant cells. The introduction of carbonyl groups into amino acid side chains of proteins represents one possible form of protein modification after attack by reactive oxygen species. Carbonyl groups are readily detectable and the observed amounts can thus serve as an indicator for the severity of protein damage. The resultsdemonstrate clearly that 'B. subtilis' proteins are susceptible to hydrogen peroxide (H2O2) mediated carbonylation damage. The application of low concentrations of H2O2 prior to the exposure to otherwise lethal levels of peroxide reduced markedly the degree of protein carbonylation, which also held true for glucose starved cells. Artificial preloading with general stress proteins resulted in a lower level of protein carbonylation when cells were subjected to oxidative stress, but no differences were detected between wild-type and 'sigB' mutant cells. In the third part, strains with mutations in genes encoding general stress proteins were screenedfor decreased resistance after H2O2 challenge. It was demonstrated that resistance to H2O2 challenge. It was demonstrated that resistance to H2O2 after transient heat treatment, likewise to conditions of glucose starvation, was at least partly mediated by the sB-dependent general stress response. The screening of mutants in sB-controlled genes revealed an important role for the deoxyribonucleic acid (DNA)-binding protein Dps in the context of sB-mediated resistance to oxidative stress underlining previous reports. Therefore, the experimental strategy opens a global view on the importance of DNA integrity in 'B. subtilis' under conditions of oxidative stress. The fourth part includes analysis of a 'B. subtilis' thioredoxin conditional mutant. The thiol-disulfide oxidoreductase TrxA is an essential protein in 'B. subtilis' that is suggested to be involved in maintaining the cytoplasmic thiol-disulfide state even under conditions of oxidative stress. To investigate the physiological role of TrxA, growth experiments and two-dimensional gel electrophoresis were carried out with exponentially growing cells that were depleted of TrxA. The observations indicate that TrxA essentially involved in the re-reduction of phosphoadenosyl phosphosulfate reductase CysH within the sulfate assimilation pathway of 'B. subtilis'.
The insulin dependent type 1 diabetes mellitus (IDDM) and the metabolic syndrome are complex human diseases. Both diseases are heterogeneous, genetically inherited and do not follow a simple Mendelian single-locus pattern. The analysis of complex human diseases is complicated both by genetic heterogeneity and by environmental factors. One way to overcome the problem of genetic heterogeneity in humans may be to cluster patients by kinship. It was shown by analysis of maternal lines of type 1 diabetics using mitochondrial DNA that 89% of maternal lines are related to each other. Moreover, an alternative to the genetic differential analysis of complex mammalian diseases is the use of animal models. The availability of inbred animal models closely resembling the human disease is an essential component of genetic investigations in this field, as shown in the results of this work. These findings do not only underscore the utility of the congenic and subcongenic approach in differentially analyzing complex traits, but also show that candidate genes can be identified and that chromosomal exchange can variously influence the phenotype, leading to sub-phenotypes which may be representative for human beings. Furthermore, it will also be possible to locate the syntenic region in the human genome and congenic and subcongenic strains can also be used to study interactions between chromosomal regions and various selected environmental conditions. In this way, it may be possible to learn which region can be influenced by environmental factors and to which extent, an undertaking which will require prospective projects.
This work studies different alternatives for parallelization of ground-state DMRG, with a focus on shared memory multiprocessor systems. Exploiting the parallelism in the dominant part of a DMRG calculation (diagonalization of the superblock Hamiltonian), speedups of 5 to 6 on 8-CPU machines can be achieved. A performance analysis gives hints as to which machine is best siuted for the task. The parallelized DMRG code is then applied to current problems in theoretical solid state physics with electronics, bosonic and spin degrees of freedom. Stripe-like modulations of the hole density in the ground state of doped Hubbard with cylindrical boundary conditions are idenficied in the thermodynamic limit using extrapolation techniques. In the 1D Holstein model of spinless fermions at half filling, Luttinger parameters and the charge structure factor are determinde in order to derive the phase diagram that had previously been established only on small lattices. For the 1D half-filled Holstein-Hubbard model, a finite size analysisof spine and charge excitation gaps in the relevant sectors (Mott insulator, Peierls band insulator and bipolaronic Peierls insulator) is able to yield the phase diagram as well. Finally, is the Heisenberg spin chain with dynamical phonons is considered as a relevant model for a spin-Peierls transition in Copper Germanate. Using DMRG, the relation between singlet-triplet excitation gap and dynamical dimeriaztion is calculated for the first time.
The present work is a paleolimnological orientated approach to refine and improve the indicator ability of freshwater ostracods from Holocene and Late glacial deposits in northeast Germany. The thesis follows two different approaches, one utilizes quantitative paleoenvironmental analysis, while the other evaluates ecological investigations of living specimens to extend the potential indicator group. For the first time quantitative ostracod analysis are carried out for a lacustrine basin (lake Krakower See) and a near-shore locality (Pudagla lowland) in the study area. The ecological investigation of living ostracods comprises 96 localities. The evaluation focused on environmental variables, which explain significantly the species composition. A canonical correspondence analysis identified at least four environmental parameters - water temperature, conductivity, pH-value, and mean water depth – which have an effect on ostracod assemblages. An extended analysis, which included only a subset of lake sites, revealed also that the former three environmental parameters affect the ostracod lake fauna, whereas the water temperature is the dominant factor. A temperature-transfer function could be regressed and calculated from the given trainingset by a weighted average model. These estimates can now be use in future paleolimnological investigations in northeast Germany to quantify the paleotemperature.
A highly stereoselective recombinant alcohol dehydrogenase aus 'Pseudomonas fluorescens' DSM50106
(2005)
The alcohol dehydrogenase was biochemically characterized. A broad range of arylaliphatic ketones is efficiently reduced to the corresponding optically active (R)-alcohols by a recombinant alcohol dehydrogenase (PF-ADH) produced by overexpression in 'Escherichia coli'. PF-ADH shows high activity and stereoselectivity in the reduction of acetophenone and various derivatives (45-99%), as well as in the reduction of 3-oxy-butyric acid methyl ester and 3-oxy-butyric acid methyl ester and 3-oxy-hexanoic acid ethyl ester (>99%). The highest activity was observed between 10 and 20°C. The copfactor NADH can be efficiently recycled by the addition of 10-20% of iso-propanol. A flow-through-polarimetry-based assay to determine oxidoreductase activity and stereoselectivity is described.
About 30 % of epileptic patients are non-responsive to multidrug antiepileptic therapy. One of non-responsiveness in epilepsy hypothesis claims that non-responsiveness occurs because of reduced access of antiepileptic drugs to their targets, as a result of increased efflux of antiepileptic drugs away from these targets. Transporters believed to be involved in non-responsiveness in epilepsy are mainly but not exclusively the members of the ABC superfamily including P-gp (MDR1, ABCB1), MRP1 (ABCC1), MRP2 (ABCC2) and others. These proteins are normally found in the blood-brain barrier and the blood-cerebrospinal fluid barrier where they function as protectors. There is emerging evidence that P-gp, MRP1 and MRP2 are up-regulated in epileptogenic brain tissue. The risk of non-responsiveness could be related also to the MDR1 or MRP2 gene polymorphisms. We hypothesised that changes in expression and function of multidrug transporters involved in non-responsiveness of epilepsy might be detectable not only in the brain but also in other tissues such as lymphocytes. Therefore we evaluated the expression of MDR1, MRP1 and MRP2 and function of P-gp in lymphocytes in patients with epilepsy and healthy subjects. Three groups of epileptic patients and 15 healthy subjects as a control group were included in the study. The patients’ group was defined as follows: Monotherapy – patients treated with carbamazepine monotherapy, without seizures - corresponded to group responders. Combined therapy – patients after monotherapy (two different medicines have been tried) and combined therapy (two trials of combined therapy), not free of seizures. Monotherapy and combined therapy groups each embraced 15 patients. Neurosurgery – patients who had undergone neurosurgery, afterwards were or were not additionally treated with carbamazepine, with or without seizures. This group comprised 24 patients. Combined therapy and neurosurgery groups composed the group of non-responders. The mRNA expression of MRP1, MRP2 and MDR1 by means of quantitative real-time PCR as well as MRP2 and P-gp protein content by Western blot in lymphocytes was measured. For P-gp functional analysis rhodamine efflux from lymphocytes and natural killer (NK) cells was performed. The influence of the polymorphisms C3435T, G2677T/A in the MDR1 gene and C24T, G1249A, C3972T in the MRP2 gene for the transporters expression, function and their association with non-responsive epilepsy phenotype was investigated. Our results showed that MRP1 expression in lymphocytes was significantly lower in epileptics than in healthy subjects. Non-responders had lower MRP1 mRNA content in lymphocytes than responders. We did not find any difference in MRP2 expression between epileptics and healthy volunteers. MRP2 mRNA levels in lymphocytes were higher in non-responders than in responders. However, at protein level epileptic patients had significantly lower MRP2 content in lymphocytes than controls. MRP2 protein content did not differ in responders and non-responders. There was no reliable correlation between MRP2 mRNA expression and MRP2 protein content in lymphocytes. Epileptics had significantly lower MDR1 expression in lymphocytes than healthy individuals. MDR1 expression was decreasing according to the consumption of antiepileptic drugs and seizures frequency: patients after neurosurgery had significantly lower MDR1 expression than patients after combined therapy and monotherapy. MDR1 expression was significantly lower in non-responders than in responders. At protein level epileptics had lower P-gp content than controls. Detected P-gp amount in lymphocytes did not differ between responders and non-responders. Rhodamine efflux from lymphocytes and NK cells did not differ significantly between epileptics and healthy subjects, but it was higher in patients after neurosurgery than in patients after monotherapy. Rhodamine efflux from NK cells, which are known to express the highest levels of P-gp, was significantly higher in non-responders than in responders. In this study, we showed that MRP1 mRNA expression in lymphocytes was significantly correlated to its expression in the brain. We detected also a significant co-correlation between MRP1 expression in the hippocampus and MDR1 expression in lymphocytes. We found no evidence regarding the impact of the MDR1 polymorphisms on mRNA expression, P-gp content and rhodamine efflux from lymphocytes. Our data showed lack of evidence regarding the impact of the MRP2 polymorphisms on mRNA expression and protein content. We did not detect any association between MDR1 or MRP2 polymorphisms and non-responsiveness in epilepsy or epilepsy in the main. In conclusion, our results suggest that lymphocytes are an appropriate surrogate for studies on changes of multidrug transporters expression in epilepsy. Lymphocytes as an easily accessible tissue might serve as a marker for responsiveness to antiepileptic drug therapy in epilepsy studies.
The biodiversity of marine microorganisms opens a promising potential for the discovery of new technical enzymes. During this study a characterization of marine microorganisms, isolated from Arctic or Antarctic ice, sea water or sediment from the ocean was performed based on a comprehensive strain collection at the Alfred-Wegener-Institut für Polar- und Meeresforschung. These marine psychrophilic bacteria indicated a wide spectrum of extracellular cold-active enzymes. 16S rRNA sequencing revealed that many of these psychrophilic bacteria represent new species. Characterization of selected isolates by means of transmission electron or raster electron microscopy showed remarkably pleomorphic cellular structures throughout their growth. The major part of this thesis focuses on a marine Antarctic, psychrophilic bacterium (strain ANT/505) isolated from sea ice covered surface water from the Southern Ocean, which was identified to express a very uncommon enzymatic activity for the marine environment, namely a pectinolytic activity. The sequencing of the 16S rRNA of isolate ANT/505 and biochemical tests indicated a taxonomical affiliation to the specie Pseudoalteromonas haloplanktis. The supernatant of this bacterial isolate showed after growth on citrus pectin three different pectinolytic activities. By activity screening of a genomic DNA library of isolate ANT/505 in Escherichia coli, two different pectinolytic clones could be isolated. Subcloning and sequencing revealed two open reading frames of 1671 and 1968 nt corresponding to proteins of 68 and 75 kDa. The deduced amino acid sequence of the two orfs showed homology to pectate lyases from Erwinia chrysanthemi and Aspergillus nidulans. The pectate lyases contain signal peptides of 17 and 26 amino acids length that were correctly processed after overexpression in E. coli BL21. Both enzymes were purified by anionic exchange chromatography. Maximal enzymatic activities for both pectate lyases were observed at a temperature of 30°C and a pH range of 9-10. The Km values of both lyases for pectate and citrus pectin were 1 g⋅l-1 and 5 g⋅l-1, respectively. Calcium was required for activity on pectic substrates, while the addition of 1 mM ethylenediaminetetraacetic acid (EDTA) resulted in complete inhibition of the enzymes. These two cold-adapted enzymes represent the first pectate lyases isolated and characterized from a marine bacterium. Further cloning and sequence analyses revealed that PelA from P. haloplanktis is an exceptionally big bifunctional enzyme featuring pectate lyase and pectin methylesterase activity. The deduced amino acid sequence of the pectin methylesterase domain showed homology to group I pectin methylesterases from Erwinia chrysanthemi and Erwinia carotovora. The pectin methylesterase domain of PelA was found to show highest homology to a potential pectin methylesterase from Saccharophagus degradans strain MD2-40. Maximum pectin methylesterase activity of PelA was detected at a pH of 7.5 and a maximum temperature of 30°C. This cold-adapted enzyme revealed high remaining pectin methylesterase activity at low temperatures around 5°C and was quickly unstabilized at temperatures above 45°C. The analysis of the localization of the two pectinolytic genes on the genome of P. haloplanktis ANT/505 revelaed that these pectinase genes are expressed from independent cistrons, which are not clustered but located at distant positions on chromosome I of the P. haloplanktis genome. It was found that the transcription of both pectinase genes is induced by the presence of pectin. By means of primer extension the promoter regions of both cistrons were detected.
Recent geochemical and mineralogical alteration processes in tropical coastal sediments of Vietnam
(2006)
The dissertation contains two main parts: (i) Syn-sedimentary hydrodynamic processes & relationship with elemental distribution, clay matter, (ii) Short-term mineral alteration during early diagenes. Samples were taken from the uppermost one metre (<50 year old in RRD, < 300 y old in south central VN). In part one, three principal hydrodynamic factors can be revealed based on End-Member Modelling Algorithm (EMMA), for the polymodal grain-size distribution patterns in coastline of VN (i) Accumulation factor: accumulation of terrigenous sediments linked with a grain size separation (distance dependence), (ii) Erosion factor: synsedimentary erosion by wave activities, (iii) Aeolian factor: deposition from neighbour sand bar by wind (typically only for low sedimentation rate, like in South Central Coast but not to detect in RRD). Distributions of clay matter and chemical elements in the coastal sediments in Vietnam are strongly influenced by hydrodynamic forces (distance from the coastline). In part two, particle-wise analysis by TEM allowed to determined four main mixed layer series: di-Vermiculite/Smectite-ml, Kaolinite/ Expandable-ml, Illite/Smectite-ml, Chlorite/Saponite-ml. Three principal mineral alteration processes can be detected in coastal sediments during early diagenesis: Dissolution, Smectitization, Kaolinitization, based on XRD (CSD, peak area) & TEM-EDX (particle morphology, chemical formula, polytype, particle frequency). Dissolution process of clay matter is typically in the coastal alkaline condition. It is a function of diagenetic time. Dissolution begins with a higher degree of dislocation and is followed by step-wise delamination & dissolution of the first stacks Smectitization (mirrored in diVS-ml series) alters mica-like structures (illite, dioctahedral vermiculite) to smectitic structures (Beidellite, Montmorillonite). Smectitization process occurs in group-wise layer by layer transforming mechanism (mica-like layer to smectitic layer). Each step is indicated by a gauss-like distribution of the octahedral layer charge with K as trigger. Kaolinitization of KE series alters smectitic structure (beidellite, smectitic KE-ml) to kaolinitic structure (kaolinitic KE-ml, kaolinite) "interlayer by interlayer" transformation of KE-ml series is comparable to kaolinitization mechanism discussed by Dudek et al. (2006).OH- groups in ambient could be the trigger. Mangroves biota influences the sediments in two main pathways: Nutrients supply & trapping function (clay matter, heavy metals)Interaction of active root-layer: intensification of dissolution, smectitization & kaolinitization: uptake of K, Na by mangrove root is possible trigger Human activities like shrimp cultivation have stopped the influences of the former active roots.Besides, erosion process related to water discharge gives rise to dispersion of clay species & heavy metals => more toxic for ecosystem.
The non-natural substances in commonly used UV protection creams such as TiO2, are known to have a photocatalytic side effect, which is very harmful to human skin. This study presents some properties of clays and clays minerals concerning UV protection potential, which can be very helpful for the development of new UV protection cream generation. Clays and clay minerals are demonstrated that they have potential to absorb UV-radiation. The structures of clay particles in cream were shown to be dependent on the layer charge of clay minerals. The total amount of Fe2C>3 in chemical composition of clay plays a key role in determining the UV-absorption ability of the clay matter. Moreover, the UV-absorption ability also depends on the expandable or non- expandable property of the clay. The studies were also performed on the mixtures of wool-wax-alcohol cream and nanosuspension obtained by the extraction of fungi mass Ganoderma pfeifferi by using plantacare together with clay. The combination of clays and nanosuspension increased its UV-absorption ability. The skin model test was performed in vivo in mouse ears with skin flora Escherichia coli and infectious bacteria Staphylococcus aureus in order to determine the effects of cream samples on skin under UV irradiation and skin infection. From the results of characterization of clays and clay minerals properties in UV protection cream, this study also brings some ideas about products designing.