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This work presents mathematical and computational approaches to cover various aspects of metabolic network modelling, especially regarding the limited availability of detailed kinetic knowledge on reaction rates. It is shown that precise mathematical formulations of problems are needed i) to find appropriate and, if possible, efficient algorithms to solve them, and ii) to determine the quality of the found approximate solutions. Furthermore, some means are introduced to gain insights on dynamic properties of metabolic networks either directly from the network structure or by additionally incorporating steady-state information. Finally, an approach to identify key reactions in a metabolic networks is introduced, which helps to develop simple yet useful kinetic models. The rise of novel techniques renders genome sequencing increasingly fast and cheap. In the near future, this will allow to analyze biological networks not only for species but also for individuals. Hence, automatic reconstruction of metabolic networks provides itself as a means for evaluating this huge amount of experimental data. A mathematical formulation as an optimization problem is presented, taking into account existing knowledge and experimental data as well as the probabilistic predictions of various bioinformatical methods. The reconstructed networks are optimized for having large connected components of high accuracy, hence avoiding fragmentation into small isolated subnetworks. The usefulness of this formalism is exemplified on the reconstruction of the sucrose biosynthesis pathway in Chlamydomonas reinhardtii. The problem is shown to be computationally demanding and therefore necessitates efficient approximation algorithms. The problem of minimal nutrient requirements for genome-scale metabolic networks is analyzed. Given a metabolic network and a set of target metabolites, the inverse scope problem has as it objective determining a minimal set of metabolites that have to be provided in order to produce the target metabolites. These target metabolites might stem from experimental measurements and therefore are known to be produced by the metabolic network under study, or are given as the desired end-products of a biotechological application. The inverse scope problem is shown to be computationally hard to solve. However, I assume that the complexity strongly depends on the number of directed cycles within the metabolic network. This might guide the development of efficient approximation algorithms. Assuming mass-action kinetics, chemical reaction network theory (CRNT) allows for eliciting conclusions about multistability directly from the structure of metabolic networks. Although CRNT is based on mass-action kinetics originally, it is shown how to incorporate further reaction schemes by emulating molecular enzyme mechanisms. CRNT is used to compare several models of the Calvin cycle, which differ in size and level of abstraction. Definite results are obtained for small models, but the available set of theorems and algorithms provided by CRNT can not be applied to larger models due to the computational limitations of the currently available implementations of the provided algorithms. Given the stoichiometry of a metabolic network together with steady-state fluxes and concentrations, structural kinetic modelling allows to analyze the dynamic behavior of the metabolic network, even if the explicit rate equations are not known. In particular, this sampling approach is used to study the stabilizing effects of allosteric regulation in a model of human erythrocytes. Furthermore, the reactions of that model can be ranked according to their impact on stability of the steady state. The most important reactions in that respect are identified as hexokinase, phosphofructokinase and pyruvate kinase, which are known to be highly regulated and almost irreversible. Kinetic modelling approaches using standard rate equations are compared and evaluated against reference models for erythrocytes and hepatocytes. The results from this simplified kinetic models can simulate acceptably the temporal behavior for small changes around a given steady state, but fail to capture important characteristics for larger changes. The aforementioned approach to rank reactions according to their influence on stability is used to identify a small number of key reactions. These reactions are modelled in detail, including knowledge about allosteric regulation, while all other reactions were still described by simplified reaction rates. These so-called hybrid models can capture the characteristics of the reference models significantly better than the simplified models alone. The resulting hybrid models might serve as a good starting point for kinetic modelling of genome-scale metabolic networks, as they provide reasonable results in the absence of experimental data, regarding, for instance, allosteric regulations, for a vast majority of enzymatic reactions.
The Earth’s magnetic field (EMF) is generated by convections in the electrically conducting liquid iron-rich outer core, modified by the Earth’s rotation. A drastic manifestation of the dynamics of this fluid body is the occurrence of geomagnetic field reversals in the Earth’s history but also geomagnetic excursions, which are more frequent features of otherwise stable polarity chrons, but often poorly constrained in the geological record. To better understand the origin of the field, we need to know how the field has varied on different geological timescales. This includes not only information about changes in the ancient field’s direction but also about the absolute intensity (palaeointensity) and the age. This palaeointensity record is needed for compiling a full-vector description of the field. A palaeomagnetic and palaeointensity study on lava flows allows gaining insights about the evolution of the EMF through time and space. However, constraining the EMF evolution over different geological timescales remains a difficult objective due to the paucity of available palaeointensity data. One new alternative approach in palaeointensity studies is the recently proposed multispecimen parallel differential pTRM (MS) method, which has potentially several advantages over the commonly used Thellier method, because it is in theory independent of magnetic domain state, less prone to biasing effects, such as thermal alteration and significantly faster to perform in the laboratory. A study of highly active volcanic regions, such as the Trans-Mexican Volcanic Belt, seems promising when attempting a full-vector reconstruction or when looking for field excursions. One aim of this thesis was to gain new information about the occurrence and global validity of geomagnetic excursions from the Brunhes- or Matuyama Chron. For this purpose some 75 lava flows from within the Trans-Mexican Volcanic Belt were sampled for palaeomagnetic analyses. The scatter of virtual geomagnetic poles from lavas younger than 1.7 Ma was used for estimating palaeosecular variation and was found to be consistent with latitude dependent Model G and other high quality palaeomagnetic data from Mexico. The palaeomagnetic mean-vectors of 56 lavas were correlated to the Geomagnetic Polarity Timescale supplemented with information on geomagnetic excursions. On the grounds of their associated radioisotopic ages, four lavas were tentatively correlated with known excursions from marine records. Two lava flows dating of Brunhes Chron were associated with the Big Lost and Delts/Stage 17 excursions, respectively. From further two flows dating of Matuyama Chron, one flow was associated with either the Santa Rosa- or Kamikatsura excursions, while the other could have been emplaced during the Gilsa excursion. The most significant outcome was the finding that both Brunhes excursional flows display nearly fully reversed directions that deviate almost 180°C from the expected normal polarity direction. This observation could indicate that in particular the Big Lost and Delta/Stage17 excursions may represent other short periods during which the field completed a full reversal for a short time, such as was previously found for other older cryptochrons or tiny wiggles. Another focus of this thesis was set on estimating the feasibility of the new MS method for routine palaeointensity determination. This was accomplished by applying the MS method to samples from 11 historical lava flows from Mexico and Iceland from which the actual field intensity was either known from contemporary observatory data, or deduced from magnetic field models. Comparing observed with expected intensity values allowed to test the accuracy of the MS method. It a was found that the majority of palaeointensity estimates after the MS method yielded results that were very close or indistinguishable within the range of uncertainty from the expected values. However, a general trend towards an overestimate in the palaeointensity was also observed, which, on the grounds of corroborating rock magnetic analyses, was associated with multidomain material. This observation was taken as first evidence that the MS method is not entirely independent of magnetic domain state, as was originally claimed. However, a second experiment in which a modification of the most widely used Thellier method was applied to sister samples from 5 Icelandic flows revealed that, in comparison to the MS method, the latter produced more accurate and statistically better defined palaeointensities. Thus, from these first results, the MS method appeared as a viable alternative for future palaeointensity studies. Subsequently it was attempted to corroborate the directional record from Mexican lavas with palaeointensity data. It was possible to acquire palaeointensity estimates for 32 out of 51 investigated lava flows. These new results revealed that the new MS palaeointensities for Mexico are, with a high degree of statistical significance, around 30% higher than expected. The generally high palaeointensities seem to corroborate the results obtained from historical lava flows in this study and other previous studies on synthetic samples where domain state effects were found to cause overestimates in the palaeointensity of up to 30 per cent in the MS method. The primary process that leads to this overestimate is assigned to an asymmetry in the demagnetisation and remagnetisation process. Yet, this overestimate is expected to be no larger than what might be expected from Thellier experiments performed on samples with a given degree of multidomain behaviour.
Modern anthropogenic forcing of atmospheric chemistry poses the question of how the Earth System will respond as thousands of gigatons of greenhouse gas are rapidly added to the atmosphere. A similar, albeit nonanthropogenic, situation occurred during the early Paleogene, when catastrophic release of carbon to the atmosphere triggered abrupt increase in global temperatures. The best documented of these events is the Paleocene-Eocene Thermal Maximum (PETM, ~55 Ma) when the magnitude of carbon addition to the oceans and atmosphere was similar to those expected for the future. This event initiated global warming, changes in hydrological cycles, biotic extinction and migrations. A recently proposed hypothesis concerning changes in marine ecosystems suggests that this global warming strongly influenced the shallow-water biosphere, triggering extinctions and turnover in the Larger Foraminifera (LF) community and the demise of corals. The successions from the Adriatic Carbonate Platform (SW Slovenia) represent an ideal location to test the hypothesis of a possible causal link between the PETM and evolution of shallow-water organisms because they record continuous sedimentation from the Late Paleocene to the Early Eocene and are characterized by a rich biota, especially LF, fundamental for detailed biostratigraphic studies. In order to reconstruct paleoenvironmental conditions during deposition, I focused on sedimentological analysis and paleoecological study of benthic assemblages. During the Late Paleocene-earliest Eocene, sedimentation occurred on a shallow-water carbonate ramp system characterized by enhanced nutrient levels. LF represent the common constituent of the benthic assemblages that thrived in this setting throughout the Late Paleocene to the Early Eocene. With detailed biostratigraphic and chemostratigraphic analyses documenting the most complete record to date available for the PETM event in a shallow-water marine environment, I correlated chemostratigraphically for the first time the evolution of LF with the δ¹³C curves. This correlation demonstrated that no major turnover in the LF communities occurred synchronous with the PETM; thus the evolution of LF was mainly controlled by endogenous biotic forces. The study of Late Thanetian metric-sized microbialite-coral mounds which developed in the middle part of the ramp, documented the first Cenozoic occurrence of microbially-cemented mounds. The development of these mounds, with temporary dominance of microbial communities over corals, suggest environmentally-triggered “phase shifts” related to frequent fluctuations of nutrient/turbidity levels during recurrent wet phases which preceding the extreme greenhouse conditions of the PETM. The paleoecological study of the coral community in the microbialites-coral mounds, the study of corals from Early Eocene platform from SW France, and a critical, extensive literature research of Late Paleocene – Early Eocene coral occurrences from the Tethys, the Atlantic, the Caribbean realms suggested that these corals types, even if not forming extensive reefs, are common in the biofacies as small isolated colonies, piles of rubble or small patch-reefs. These corals might have developed ‘alternative’ life strategies to cope with harsh conditions (high/fluctuating nutrients/turbidity, extreme temperatures, perturbation of aragonite saturation state) during the greenhouse times of the early Paleogene, representing a good fossil analogue to modern corals thriving close to their thresholds for survival. These results demonstrate the complexity of the biological responses to extreme conditions, not only in terms of temperature but also nutrient supply, physical disturbance and their temporal variability and oscillating character.
Dietary antioxidants are believed to play an important role in the prevention and treatment of a variety of diseases associated with oxidative stress. Although there is a wide range of dietary antioxidants, the bulk of the research to date has been focused on the nutrient antioxidants vitamin C, E, and carotenoids. Certain relatively uncommon antioxidants such as lipoic acid (LA), and phenolic compounds such as (-)-epicatechin (EC), (-)-epigallocatechin (EGC), (-)-epicatechin gallate (ECG), and (-)-epigallocatechin gallate (EGCG), have not been extensively investigated although they may exert greater antioxidant potency than that of carotenoids and vitamins. Extracts from selected plants and plant byproducts may represent rich sources for one or more of such antioxidants and therefore exhibit higher effects than a single antioxidant due to the synergistic effects produced between such antioxidants. However, in the last decade a number of epidemiological, animal and in vitro studies have suggested a protective and therapeutic potency of these antioxidants in a broad range of diseases such as cancer, diabetes, atherosclerosis, cataract and acute and chronic neurological disorders. Inflammation, the response of the host toward any infection or injury, plays a central role in the development of many chronic diseases. Several evidences demonstrated the rise of different types of cancer from sites of inflammation. This suggests that active oxygen species and some cytokines generated in the inflamed tissues can cause injury to DNA and ultimately lead to carcinogenesis. Diethylnitrosamine (DEN) is one of the most important environmental carcinogens, present in a variety of foods, alcoholic beverages, tobacco smoke and it can be synthesized endogenously. In addition to the liver it can induce carcinogenesis in other organs like kidney, trachea, lung, esophagus, fore stomach, and nasal cavity. Several epidemiological and laboratory studies indicate that nitroso compounds including DEN may induce hyperplasia and chronic inflammation which is closely associated with the development of hepatocellular carcinoma. Despite increasing evidence on the potential of antioxidants in modulating the etiology of chronic diseases, little is known about their role in inflammation and acute phase response (APR). Therefore the aim of the present work was to study the protective effect of water and solvent extracts of eight plant and plant byproducts including green tea, artichoke, spinach, broccoli, onion and eggplant, orange and potato peels as well as eight antioxidants agents including EC, EGC, ECG, EGCG, ascorbic acid (AA), acetylcysteine (NAC), α-LA, and alpha-tocopherol (α-TOC) toward acute inflammation induced by interleukin-6 (IL-6) and hepatotoxicity induced by DEN in vitro. The negative acute phase proteins (APP), transthyretin (TTR) and retinol-binding protein (RBP) were used as inflammatory biomarkers analyzed by ELISA, whereas neutral red assay was used for evaluating the cytotoxicity. All experiments were performed in vitro using human hepatocarcinoma cell line (HepG2). Additionally the antioxidant activity was measured by TEAC and FRAP assays, phenolic content was measured by Folin–Ciocalteu and characterized by HPLC. Moreover, the microheterogeneity of TTR was detected using immunoprecipitation assay combined with SELDI-TOF MS. Results of present study showed that HepG2 cells provide a simple, sensitive in vitro system for studying the regulation of the negative APP, TTR and RBP under free and inflammatory condition. IL-6, a potent proinflammatory cytokine, in a concentration of 25 ng/ml was able to reduce TTR and RBP secretion by approximately 50-60% after 24h of incubation. With exception of broccoli and water extract of onion which showed pro-inflammatory effects in this study, all other plant extracts, at specific concentrations, were able to elevate TTR secretion in normal condition and even under treatment of IL-6 where the effect was quite lower. Green tea followed by artichoke and potato peel exhibited the highest elevation in TTR concentration which reached 1.1 and 2.5 folds of control in presence and absences of IL-6 respectively. In general Plant extracts were ordered according their anti-inflammatory potency as following: in water extracts; green tea > artichoke > potato peel > orange peel > spinach > eggplant peel, where in solvent extracts; green tea > artichoke > potato peel > spinach > eggplant peel > onion > orange peel. The antiinflammatory effect of water extracts of green tea, artichoke and orange peel were significantly higher than their corresponding solvent extracts whereas water extracts of eggplant-, potato peels and spinach showed lower effect than their solvent extracts. On the other hand α-LA followed by EGCG and ECG exhibited the highest elevation in TTR concentration compared to other antioxidants. The relation between the anti-inflammatory potential and antioxidants activity and phenolic content for the investigated substances was generally weak. This may suggest the involvement of other mechanisms than antioxidants properties for the observed effect. TTR secreted by HepG2 cells has a molecular structure quite similar to the purified standard and serum TTR in which all the three main variants are contained including native, S-cystinylated and Sglutathionylated TTR. Interestingly, a variant with molecular mass of 13453.8 + 8.3 Da has been detected only in TTR secreted by HepG2. Among all investigated antioxidants and plant extracts, six substances were able to elevate the native preferable TTR variant. The potency of these substances can be ordered as following α-LA > NAC > onion > AA > EGCG > green tea. A weak correlation between elevation on TTR and shifting to the native form was observed. Similar weak correlation has also been observed between antioxidants activity and elevation in native TTR. Although DEN was able to induce cell death in a concentration dependent manner, it requires considerably higher concentrations for its effects especially after 24h. This may be attributed to a lack in cytochrome P450 enzymes produced by HepG2. At selected concentrations some antioxidants and plant extracts significantly attenuate DEN cytotoxicity as following: spinach > α-LA > artichoke > orange peel > eggplant peel > α-TOC > onion > AA. Contrary all other substances especially green tea, broccoli, potato peel, and ECG stimulate DEN toxicity. In conclusion, this study demonstrated that selected antioxidants and plant extracts may attenuate the inflammatory process, not only by their antioxidants potency but also by other mechanisms which remain unclear. They may also play a vital role on stabilizing the tetramic structure of TTR and thereby prevent amyloidosis diseases. Lipoic acid represents in this study unique function against inflammation and hepatotoxicity. Despite the protective effect demonstrated by investigated substances, attention should also be given to the pro-oxidant and potential cytotoxic effects produced at higher concentrations.
Minimalist accounts lack a natural theory of markedness, whereas Optimality-Theoretical accounts fundamentally encode markedness. We think the duality of interfaces assumed in Minimalism is a step towards explaining pairedness behavior, where a given language exhibits a marked/ unmarked pair of items occupying the same niche. We argue that while Minimalism articulates the derivational aspect of language, and underlies grammaticality, an Optimality Theoretic articulation of PF and LF is conceptually natural and explains pairedness behavior. We adopt this ‘hybrid’ account, first, to explain the existence of marked (often termed ‘reflexive’) and unmarked anticausatives in German, recently studied in depth by Sch¨afer [2007].
Branching constraints
(2009)
Rejecting approaches with a directionality parameter, mainstream minimalism has adopted the notion of strict (or unidirectional) branching. Within optimality theory however, constraints have recently been proposed that presuppose that the branching direction scheme is language specific. I show that a syntactic analysis of Chechen word order and relative clauses using strict branching and movement triggered by feature checking seems very unlikely, whereas a directionality approach works well. I argue in favor of a mixed directionality approach for Chechen, where the branching direction scheme depends on the phrase type. This observation leads to the introduction of context variants of existing markedness constraints, in order to describe the branching processes in terms of optimality theory. The paper discusses how and where the optimality theory selection of the branching directions can be implemented within a minimalist derivation.
This paper discusses three case studies on the realization of spurious prepositions and argues that they illustrate a general interaction of convergence requirements of the morphological component with an economy condition that enforces faithfulness between the lexical items present in the numeration and the lexical items present in the PF output.
Variation in dative resumption among and within Alemannic varieties of German strongly favors an Evaluator component that makes use of optimality-theoretic evaluation rather than filters as in the Minimalist Program (MP). At the same time, the variation is restricted to realizational requirements. This supports a model of syntax like the Derivations and Evaluations framework (Broekhuis 2008) that combines a restrictive MP-style Generator with an Evaluator that includes ranked violable (interface) constraints.
Say hello to markedness
(2009)
In this paper, it will be shown that Bi-directional Optimality Theory (BOT) runs into problems of undergeneration when confronted with a certain class of partial-blocking phenomena. The empirical problem used to illustrate this is the cross-linguistic variation of one-step past-referring tenses. It will be argued that the well-known ‘present perfect puzzle’ is a sub-problem of it. The solution to the cross-linguistic variation of these tenses involves blocking of the marked tense. The relevant notion of ‘markedness’, while underivable synchronically, is argued to be linked to diachronic learning processes similar to those investigated by Benz (2006).
Aspect splits can affect agreement, Case, and even preposition insertion. This paper discusses the functional ‘why’ and the theoretical ‘how’ of aspect splits. Aspect splits are an economical way to mark aspect by preserving or suppressing some independent element in one aspect. In formal terms, they are produced in the same way as coda conditions in phonology, with positional/contextual faithfulness.This approach captures the additive effects of cross-cutting splits. Aspect splits are analyzed here from Hindi, Nepali, Yucatec Maya, Chontal, and Palauan.
In this paper I argue that both parametric variation and the alleged differences between languages in terms of their internal complexity straightforwardly follow from the Strongest Minimalist Thesis that takes the Faculty of Language (FL) to be an optimal solution to conditions that neighboring mental modules impose on it. In this paper I argue that hard conditions like legibility at the linguistic interfaces invoke simplicity metrices that, given that they stem from different mental modules, are not harmonious. I argue that widely attested expression strategies, such as agreement or movement, are a direct result of conflicting simplicity metrices, and that UG, perceived as a toolbox that shapes natural language, can be taken to consist of a limited number of markings strategies, all resulting from conflicting simplicity metrices. As such, the contents of UG follow from simplicity requirements, and therefore no longer necessitate linguistic principles, valued or unvalued, to be innately present. Finally, I show that the SMT does not require that languages themselves have to be optimal in connecting sound to meaning.
Inhalt: 1. Einführung 2. Einige Bruchstücke aus den Arbeitsergebnissen zur Forschung DDR-Musikerziehung und zum Musiklernen in der DDR 3. Ausgewählte Diskussionspunkte und Perspektiven im zeitgeschichtlichen Forschungsfeld DDR-Musikerziehung 3.1 Was ist Zeitgeschichte im Kontext musikpädagogischer Forschung? 3.2 Welche motivationalen Zugänge zur Erforschung der DDR-Musikpädagogik lassen sich finden? 3.3 Kann die wissenschaftliche Auseinandersetzung mit der DDR-Musikpädagogik als Modellfall gelten? 3.4 Welcher Sachstand ist zur Erforschung der DDR-Musikpädagogik zu bilanzieren? 3.5 Welche Forschungsdesiderata konnten festgestellt werden?
Are the Germans interested in flamenco nowadays? If so they are, then how can a type of art that is so different from both German cultured and popular music be represented in the culture of that country? Possible answers to this and other questions on the still romantic image of flamenco held in Central Europe will be provided by the analysis of the flamenco being offered at German universities, festivals, private dance schools, publishing houses and websites.
Are the Germans interested in flamenco nowadays? If so they are, then how can a type of art that is so different from both German cultured and popular music be represented in the culture of that country? Possible answers to this and other questions on the still romantic image of flamenco held in Central Europe, will be provided by the analysis of the flamenco being offered at German universities, festivals, private dance schools, publishing houses and websites.
Content: 1. Introduction 2. Music in the curriculum of The Educación Obligatoria 2.1 Music in Educación Primaria - Listening and Comprehension - Music Making - Rational Analysis (Musical Notation) 2.2. Music in Educación Secundaria Obligatoria (E.S.O. Compulsory Secondary education) and Bachillerato (Pre-University Education) 3. Music in the Spanish Non-Compulsory Education 3.1. Elementary and Medium Levels 3.2. The “Title of Higher Music Education” 4. The new certificate of “Didactic Specialization” 5. Concluding remarks
Inhalt: 1. Interkulturelles Musiklernen in der Schule - einige grundsätzliche Anmerkungen 2. Zielsetzungen eines interkulturellen Musikunterrichts 3. Probleme eines schulischen interkulturellen Musiklernens 4. Methodische Versuche und Optionen eines interkulturellen Musiklernens 4.1 Methodische Wege eines interkulturellen Musiklernens 5. Ausblick
Rezensiertes Werk: Prietzel, Malte: Kriegführung im Mittelalter : Handlungen, Erinnerungen, Bedeutungen / Malte Prietzel. - Paderborn [u.a.] : Schöningh, 2006. - 406 S. - (Krieg in der Geschichte ; 32) ISBN-10 3-506-75634-6 <A href='www.pickitisbn:3-506-75634-6'><img style='border: 0px none' src='https://www.citavi.com/softlink?linkid=findit' title='Titel anhand dieser ISBN in Citavi-Projekt übernehmen'/></A> ISBN-13 978-3-506-75634-3 <A href='www.pickitisbn:978-3-506-75634-3'><img style='border: 0px none' src='https://www.citavi.com/softlink?linkid=findit' title='Titel anhand dieser ISBN in Citavi-Projekt übernehmen'/></A> Prietzel, Malte: Krieg im Mittelalter / Malte Prietzel. - Darmstadt : Wiss. Buchges., c 2006. - 208 S. : zahlr. Ill., Kt. ISBN-10 3-534-16715-5 <A href='www.pickitisbn:3-534-16715-5'><img style='border: 0px none' src='https://www.citavi.com/softlink?linkid=findit' title='Titel anhand dieser ISBN in Citavi-Projekt übernehmen'/></A> ISBN-13 978-3-534-16715-9 <A href='www.pickitisbn:978-3-534-16715-9'><img style='border: 0px none' src='https://www.citavi.com/softlink?linkid=findit' title='Titel anhand dieser ISBN in Citavi-Projekt übernehmen'/></A>
Rezensiertes Werk: Rehse, Birgit: Die Supplikations- und Gnadenpraxis in Brandenburg-Preußen : eine Untersuchung am Beispiel der Kurmark unter Friedrich Wilhelm II. (1786 - 1797) / von Birgit Rehse. - Berlin : Duncker & Humblot, c 2008. - 676 S. : Ill. - (Quellen und Forschungen zur brandenburgischen und preußischen Geschichte ; 35) Zugl.: Berlin, Freie Univ., Diss., 2006 ISBN-10 3-428-12591-6 <A href='www.pickitisbn:3-428-12591-6'><img style='border: 0px none' src='https://www.citavi.com/softlink?linkid=findit' title='Titel anhand dieser ISBN in Citavi-Projekt übernehmen'/></A> ISBN-13 978-3-428-12591-3 <A href='www.pickitisbn:978-3-428-12591-3'><img style='border: 0px none' src='https://www.citavi.com/softlink?linkid=findit' title='Titel anhand dieser ISBN in Citavi-Projekt übernehmen'/></A>
Rezensiertes Werk: L' armée et la ville dans l'Europe du Nord et du Nord-Ouest : du XVe siècle à nos jours / Philippe Bragard ... (eds.). - Louvain-la-Neuve <BE> : Academia-Bruylant [u.a.], 2006. - 409 S. - (Temps et espaces / Bibliothèque de la Faculté de Philosophie et Lettres, Université Catholique de Louvain ; 7) ISBN 978-2-87416-013-4 <A href='www.pickitisbn:978-2-87416-013-4'><img style='border: 0px none' src='https://www.citavi.com/softlink?linkid=findit' title='Titel anhand dieser ISBN in Citavi-Projekt übernehmen'/></A>
Haydelberga vt capitur
(2009)
Vom Zweckbau zum Denkmal
(2009)
Der Wert der Dinge
(2009)
Soldatentracht?
(2009)
„Gute Sach stärkt den Mann.“
(2009)
Der Zauber des Tötens
(2009)
Ansätze der materiellen Kulturforschung mit militärgeschichtlichen Fragestellungen zusammenzuführen erscheint naheliegend – ist doch die Welt des Militärs von Dingen geprägt und sind es doch die überlieferten ‚militärischen Artefakte’, wie Waffen, Rüstungen, Ehrenzeichen und Uniformen, die unsere Vorstellungen vom Militär der Frühen Neuzeit erheblich beeinflussen. Dennoch fehlen bisher Untersuchungen, in denen die Fragestellungen des kulturwissenschaftlichen material turn und der frühneuzeitlichen Militärgeschichte aufeinander bezogen werden weitgehend. Das vorliegende Themenheft versteht sich als ein erster Beitrag, diese Lücke zu schließen. Anhand von Untersuchungen zum Umgang mit Dingen und der Bedeutungszuschreibung an Dinge in der militärischen Lebenswelt werden in den Beiträgen so einerseits die Bedeutungsebenen der materiellen Kultur des Militärs und andererseits die Relevanz der materiellen Kultur für die gesellschaftlichen Wahrnehmungsmodi des Militärs als sozialer Gruppe betrachtet. Auf diese Weise gelingt es, mit den Ansätzen der materiellen Kulturforschung innovative Perspektiven auf das Verhältnis von Militär und Gesellschaft zu entwickeln.
Water shortage is a serious threat for many societies worldwide. In drylands, water management measures like the construction of reservoirs are affected by eroded sediments transported in the rivers. Thus, the capability of assessing water and sediment fluxes at the river basin scale is of vital importance to support management decisions and policy making. This subject was addressed by the DFG-funded SESAM-project (Sediment Export from large Semi-Arid catchments: Measurements and Modelling). As a part of this project, this thesis focuses on (1) the development and implementation of an erosion module for a meso-scale catchment model, (2) the development of upscaling and generalization methods for the parameterization of such model, (3) the execution of measurements to obtain data required for the modelling and (4) the application of the model to different study areas and its evaluation. The research was carried out in two meso-scale dryland catchments in NE-Spain: Ribera Salada (200 km²) and Isábena (450 km²). Adressing objective 1, WASA-SED, a spatially semi-distributed model for water and sediment transport at the meso-scale was developed. The model simulates runoff and erosion processes at the hillslope scale, transport processes of suspended and bedload fluxes in the river reaches, and retention and remobilisation processes of sediments in reservoirs. This thesis introduces the model concept, presents current model applications and discusses its capabilities and limitations. Modelling at larger scales faces the dilemma of describing relevant processes while maintaining a manageable demand for input data and computation time. WASA-SED addresses this challenge by employing an innovative catena-based upscaling approach: the landscape is represented by characteristic toposequences. For deriving these toposequences with regard to multiple attributes (eg. topography, soils, vegetation) the LUMP-algorithm (Landscape Unit Mapping Program) was developed and related to objective 2. It incorporates an algorithm to retrieve representative catenas and their attributes, based on a Digital Elevation Model and supplemental spatial data. These catenas are classified to provide the discretization for the WASA-SED model. For objective 3, water and sediment fluxes were monitored at the catchment outlet of the Isábena and some of its sub-catchments. For sediment yield estimation, the intermittent measurements of suspended sediment concentration (SSC) had to be interpolated. This thesis presents a comparison of traditional sediment rating curves (SRCs), generalized linear models (GLMs) and non-parametric regression using Random Forests (RF) and Quantile Regression Forests (QRF). The observed SSCs are highly variable and range over six orders of magnitude. For these data, traditional SRCs performed poorly, as did GLMs, despite including other relevant process variables (e.g. rainfall intensities, discharge characteristics). RF and QRF proved to be very robust and performed favourably for reproducing sediment dynamics. QRF additionally excels in providing estimates on the accuracy of the predictions. Subsequent analysis showed that most of the sediment was exported during intense storms of late summer. Later floods yielded successively less sediment. Comparing sediment generation to yield at the outlet suggested considerable storage effects within the river channel. Addressing objective 4, the WASA-SED model was parameterized for the two study areas in NE Spain and applied with different foci. For Ribera Salada, the uncalibrated model yielded reasonable results for runoff and sediment. It provided quantitative measures of the change in runoff and sediment yield for different land-uses. Additional land management scenarios were presented and compared to impacts caused by climate change projections. In contrast, the application for the Isábena focussed on exploring the full potential of the model's predictive capabilities. The calibrated model achieved an acceptable performance for the validation period in terms of water and sediment fluxes. The inadequate representation of the lower sub-catchments inflicted considerable reductions on model performance, while results for the headwater catchments showed good agreement despite stark contrasts in sediment yield. In summary, the application of WASA-SED to three catchments proved the model framework to be a practicable multi-scale approach. It successfully links the hillslope to the catchment scale and integrates the three components hillslope, river and reservoir in one model. Thus, it provides a feasible approach for tackling issues of water and sediment yield at the meso-scale. The crucial role of processes like transmission losses and sediment storage in the river has been identified. Further advances can be expected when the representation of connectivity of water and sediment fluxes (intra-hillslope, hillslope-river, intra-river) is refined and input data improves.
Die funktionelle Bedeutung des Coxsackie- und Adenovirus Rezeptors (CAR) im kolorektalen Karzinom
(2009)
Der Coxsackie- und Adenovirus Rezeptor (CAR) ist als Bestandteil von Tight Junctions (TJ) an interzellulären Adhäsionsprozessen beteiligt und scheint eine wichtige Rolle in der Karzinogenese zu spielen. Diese ist jedoch insbesondere bei Entstehung von Darmkrebs weitgehend unklar. Ziel der Arbeit war es daher, die funktionelle Bedeutung, mögliche Interaktionspartner sowie die Expressionsregulation von CAR im kolorektalen Karzinom zu analysieren. In den Zelllinien CaCo2, Colo205, DLD1, HCT116, HT29, SW480 und T84 konnte die Expression von CAR (mRNA und Protein) nachgewiesen werden. Nach stabiler CAR-Überexpression durch Transfektion von CARcDNA in DLD1, HCT116 und SW480 wurde das Zellwachstum gehemmt und eine Abnahme von Migration und Invasion induziert. Eine stabile CAR-Inhibition nach Transfektion von CARsiRNA führte in diesen Zelllinien zum Anstieg der Proliferation sowie zu verstärkter Migrations- und Invasionsaktivität, die in DLD1 mit morphologischen Änderungen einhergingen. Eine Genexpressionsanalyse der Zelllinie DLD1 mit CAR-Inhibition identifizierte α-Catenin als das am stärksten regulierte Gen. Obwohl keine direkte Interaktion beider Proteine detektiert werden konnte, führte eine stabile Re-Expression von α-Catenin in DLD1 mit stabiler CAR-Inhibition zu einer deutlichen Reduktion von Proliferation, Migration und Invasion sowie zu einem Rückgang der zellmorphologischen Änderungen. Um den Einfluss von Differenzierung auf die Regulation der CAR-Expression zu untersuchen, erfolgte eine Behandlung aller Zelllinien mit Natriumbutyrat. Dies führte in fünf der sieben Zelllinien zu einer Aktivierung des CAR-Promotors sowie zu einer gesteigerten Expression und Immunoreaktivität von CAR an der Zelloberfläche. Die Zelllinie CaCo2 zeigte nach spontaner Differenzierung durch 21-tägiges Wachstum post Konfluenz ebenfalls eine verstärkte CAR-mRNA-Expression sowie eine erhöhte CAR-Präsenz an der Zelloberfläche. Die gewonnenen Daten konnten die funktionelle Bedeutung von CAR für die Kolonkarzinogenese sowie den Einfluss von α-Catenin auf diese Funktion deutlich machen. Es wurde gezeigt, dass die Expressionsregulation sowie die subzelluläre Verteilung von CAR durch den zellulären Differenzierungsstatus beeinflusst werden kann.
Editorial: Wir greifen im vorliegenden Heft eine Reihe von eher praxisorientierten Fragestellungen auf, behandeln aber auch grundlegende Themen. Carolin König widmet sich in ihrem Beitrag über das TRIPS-Übereinkommen menschenrechtlichen Implikationen des geistigen Eigentums, wie sie vor allem für den Handel mit und die Entwicklung von Medikamenten von Bedeutung sind. Johannes Freudenreich und Florian Ranft liefern eine statistische Analyse der 29 Wahrheitskommissionen, die ihre Arbeit beendet haben. Dabei werden Variablen zu Ressourcen, Mandat, Inhalt und Ergebnis von Wahrheitskommissionen untersucht. Die Autoren wollten herausfinden, ob es ein Standardmodell für Wahrheitskommissionen gibt, kommen aber zu dem Ergebnis, dass sich ein solches noch nicht erkennbar herausgebildet hat. Unter dem Titel „Rechtsstaatlichkeit in Europa: Dogmatik im (Kon)text“ beschäftigen sich Philippe Gréciano und Norman Weiß mit dem diesbezüglichen Entwicklungsstand der Europäischen Union und versuchen, aus rechtsvergleichender Perspektive Anregungen für die weitere Entwicklung zu gewinnen. Silke Bruchmüller untersucht in ihrem Beitrag die Aktivitäten des Deutschen Bundestages im Zusammenhang mit der „Terrorismusbekämpfung in der 14. und 15. Legislaturperiode“. Der Beitrag „Menschsein als Teilhabe an innerer und äußerer Würde“ von Linda Pickny behandelt das Thema Menschenwürde aus rechtsphilosophischer Sicht. Anne Dieter ruft dazu auf, die „Menschenrechte leben [zu] lernen“, und erinnert so daran, den wohlweislich bereits in der Präambel der Allgemeinen Erklärung der Menschenrechte geforderten fortschreitenden Prozess der Anerkennung und Verwirklichung von Menschenrechten voranzutreiben. Der Dokumentationsteil enthält den traditionellen Bericht über die Arbeit des Menschenrechtsausschusses der Vereinten Nationen im Jahre 2008. Der erste Teil, verfasst von Anne Foith, behandelt vorrangig das Staatenberichtsverfahren. Corinna Dau und Gunda Meyer führen die Reihe „Mitgliedstaaten des Europarates“ mit einem Artikel über Lettland fort. Alexander Dietz und Frank Martin Brunn beschreiben Inhalte und Strukturen der „Interdisziplinäre[n] Forschung zum Thema Menschenwürde an der Universität Heidelberg“. Dem Problem der „Zirkulären Migration“ ist schließlich der Bericht von Julia Vespermann gewidmet. Buchbesprechungen runden das Heft ab, bei dessen Herstellung uns Jutta Wickenhäuser und Tim Reiß redaktionell unterstützt haben. Gunda Meyer scheidet mit diesem Heft aus der Redaktion aus, um sich ganz auf das Referendariat zu konzentrieren. Ihre Nachfolgerin, Anne Foith, gehört bereits zum Kreis unserer Autorinnen und Autoren. Wir wünschen unseren Lesern eine anregende Lektüre.
Region-Nation-Europa
(2009)
Politische Theorie hat ihre Zeit und ihren Ort. Die Potsdamer Reihe ‚Region-Nation-Europa’ geht von der Region Berlin-Brandenburg in der neuen Mitte Europas aus. Durch den europäischen Integrationsprozess gibt es tief eingreifende Entscheidungen, die von den Bevölkerungen diskutiert und bestätigt werden müssen. Politische Theorie muss in der Fortschrittskrise einer verstädterten Welt urban aufgeklärte Theorie sein, sie ist ein Produkt der Stadt und nicht der Schule.
Die Auseinandersetzung mit Fragen transkultureller Lernprozesse in der musikpädagogischen Forschung sowie die Vermittlung von Methoden interkulturellen Lernens in der Schule und der Musiklehrerausbildung spielen am Lehrstuhl Musikpädagogik und Musikdidaktik an der Universität Potsdam eine wichtige Rolle. Birgit Jank formuliert einige mögliche Strategien zur Bildung kultureller Identitäten sowie methodische Wege zum interkulturellen Lernen und weitet diese Betrachtungen auf das Feld zeitgeschichtlicher Dimensionen im Kontext einer Aufarbeitung der DDR-Musikerziehung und auf die Jüdische Musik als Gegenstand einer interkulturell gedachten Musikpädagogik aus. Wichtige Impulse haben diese Forschungen und Lehrangebote durch die mehrjährige Arbeit des Humboldt-Stipendiaten Herrn José A. Rodriguez-Quiles y Garcia am Lehrstuhl erhalten. Komparative Betrachtungen zur spanischen Musikpädagogik werden von ihm entwickelt, die den Modellfall Flamenco einschließen und ein eigenes Konzept von interkulturellen Lehrveranstaltungen hervorgebracht haben. Darüber hinaus kommen mit Tiago de Oliveira Pinto und Bernd Clausen Wissenschaftler zu Wort, die an der Universität Potsdam gelehrt oder sich wissenschaftlich in der Musikpädagogik qualifiziert haben. Diese Aufsätze werfen ein breites Spektrum interkulturellen Lernens auf, das vom Karneval der Kulturen in Berlin bis hin zu einer kritischen Auseinandersetzung mit dem Begriff der Kulturellen Vielfalt reicht.
The papers contained in this issue share the insight that the different components of the grammar sometimes impose conflicting requirements on the grammar’s output, and that, in order to handle such conflicts, it seems advantageous to combine aspects from minimalist and OT modelling. The papers show that this can be undertaken in a multiplicity of ways, by using varying proportions of each framework, and offer a broad range of perspectives for future research.
Service-oriented modeling employs collaborations to capture the coordination of multiple roles in form of service contracts. In case of dynamic collaborations the roles may join and leave the collaboration at runtime and therefore complex structural dynamics can result, which makes it very hard to ensure their correct and safe operation. We present in this paper our approach for modeling and verifying such dynamic collaborations. Modeling is supported using a well-defined subset of UML class diagrams, behavioral rules for the structural dynamics, and UML state machines for the role behavior. To be also able to verify the resulting service-oriented systems, we extended our former results for the automated verification of systems with structural dynamics [7, 8] and developed a compositional reasoning scheme, which enables the reuse of verification results. We outline our approach using the example of autonomous vehicles that use such dynamic collaborations via ad-hoc networking to coordinate and optimize their joint behavior.
In this thesis, the properties of nonlinear disordered one dimensional lattices is investigated. Part I gives an introduction to the phenomenon of Anderson Localization, the Discrete Nonlinear Schroedinger Equation and its properties as well as the generalization of this model by introducing the nonlinear index α. In Part II, the spreading behavior of initially localized states in large, disordered chains due to nonlinearity is studied. Therefore, different methods to measure localization are discussed and the structural entropy as a measure for the peak structure of probability distributions is introduced. Finally, the spreading exponent for several nonlinear indices is determined numerically and compared with analytical approximations. Part III deals with the thermalization in short disordered chains. First, the term thermalization and its application to the system in use is explained. Then, results of numerical simulations on this topic are presented where the focus lies especially on the energy dependence of the thermalization properties. A connection with so-called breathers is drawn.
Mit der globalen Banken- und Finanzkrise ist die Debatte um den Kapitalismus neu entfacht. Doch wie kapitalistisch ist die Weltwirtschaft und welche Folgen entstehen für die internationale Politik? Bereits mit seinem 2007 erschienenen Werk zur „Geschichte und Ökonomie der europäischen Welteroberung – Vom Zeitalter der Entdeckungen zum 1. Weltkrieg“ legt Hartmut Elsenhans eine umfangreiche Analyse der Geschichte und Bedingungen kapitalistischer Expansion vor. Im vorliegenden Beitrag bleibt der Autor seinem interdisziplinären Ansatz treu. Als entscheidend für kapitalistisches Wachstum werden gesellschaftliche Kräfteverhältnisse zwischen dominanten und subalternen Klassen erachtet. Der Kapitalismus erweist sich hier als fragiles System, dessen Entstehung nicht auf in vorkapitalistischen Gesellschaften vorhandene Interessen herrschender Klassen zurückzuführen ist, sondern ein ungeplant umgesetztes „Projekt“ der Subalternen darstellt.
"McCloy war nicht einfach nur der Repräsentant Washingtons in Westdeutschland, sondern wirkte darüber hinaus als einflussreicher Akteur in der amerikanischen Politik, zumal er über einen direkten Draht zum Außenminister und zur Regierung verfügte. Aus gutbürgerlichen Verhältnissen stammend, hatte McCloy jahrelang als Anwalt in der New Yorker Wall Street gearbeitet..."
"Bügeln Sie mehr, duschen Sie weniger! Mit der Energie von drei Minuten duschen kann man auch eine Stunde bügeln. Und das Handtuch bleibt trocken. Alternativ könnten Sie auch sieben bis zehn Stunden fernsehen. Dabei kämen Sie nicht mal ins Schwitzen und vermeiden die Verdunstungskälte. Googeln Sie nicht einfach rum, stricken Sie lieber einen Pulli. Rauchen Sie weniger Hanf, er ist auch ein gutes Dämmmaterial. Leisten Sie Ihren persönlichen Beitrag zur europäischen Energiesicherheit..."
Die „Gasabhängigkeit“ Europas von Russland ist ein Scheinproblem. Es gibt gegenseitige Abhängigkeiten, die auch Russlands Handeln begrenzen. Für den Russlandexperten Roland Götz wird das politisch motivierte Vorantreiben einer von Russland unabhängigen Energieversorgung nicht nur erfolglos bleiben, sondern auch den Aufbau eines partnerschaftlichen Verhältnisses zwischen Europa und Russland erschweren.
Nordkorea - Was nun?
(2009)
Ein „Schurkenstaat“ weniger? Nach langen Verhandlungen haben die Vereinigten Staaten Nordkorea im Herbst 2008 von ihrer schwarzen Liste der Terrorunterstützer gestrichen und locken jetzt sogar mit einem Friedensvertrag. Es bleibt jedoch abzuwarten, welche Früchte die Nordkoreapolitik des neuen US-Präsidenten Obama tragen wird.
The fat-soluble vitamin A, which is chemically referred to retinol (ROH), is known to be essential for the process of vision, the immune system but also for cell differentiation and proliferation. Recently, ROH itself has been reported to be involved in adipogenesis and a ROH transport protein, the retinol-binding protein 4 (RBP4), in insulin resistance and type 2 diabetes. However, there is still considerable scientific debate about this relation. With the increasing amount of studies investigating the relation of ROH in obesity and type 2 diabetes, basic research is an essential prerequisite for interpreting these results. This thesis enhances the knowledge on this relation by reviewing ROH metabolism on extra- and intracellular level. Aim 1: In the blood stream ROH is transported in a complex with RBP4 and a second protein, transthyretin (TTR), to the target cells. The levels of RBP4 and TTR are influenced by several factors but mainly by liver and kidney function. The reason for that is that liver and the kidneys are the sites of RBP4 synthesis and catabolism, respectively. Interestingly, obesity and type 2 diabetes involve disorders of the liver and the kidneys. Therefore the aim was to investigate factors that influence RBP4 and TTR levels in relation to obesity and type 2 diabetes (Part 1). Aim 2: Once arrived in the target cell ROH is bound to cellular retinol-binding protein type I (CRBP-I) and metabolised: ROH can either be stored as retinylesters or it can be oxidised to retinoic acid (RA). By acting as a transcription factor in the nucleus RA may influence processes such as adipogenesis. Therefore vitamin A has been postulated to be involved in obesity and type 2 diabetes. CRBP-I is known to mediate the storage of ROH in the liver, but the extra-hepatic metabolism and the functions of CRBP-I are not well known. This has been investigated in Part 2 of this work. Material & Methods: RBP4 and TTR levels were investigated by ELISA in serum samples of human subjects with overweight, type 2 diabetes, kidney or liver dysfunction. Molecular alterations of the RBP4 and TTR protein structure were analysed by MALDI-TOF mass spectrometry. The functions of intracellular CRBP-I were investigated in CRBP-I knock-out mice in liver and extra-hepatic tissues by measuring ROH levels as well as the levels of its storage form, the retinylesters, using reverse phase HPLC. The postprandial uptake of ROH into tissues was analysed using labelled ROH. The mRNA levels of enzymes that metabolize ROH were examined by real-time polymerase chain reaction (RCR). Results: The previous published results showing increased RBP4 levels in type 2 diabetic patients could not be confirmed in this work. However, it could be shown that during kidney dysfunction RBP4 levels are increased and that RBP4 and TTR levels are decreased during liver dysfunction. The important new finding of this work is that increased RBP4 levels in type 2 diabetic mice were increased when kidney function was decreased. Thus an increase in RBP4 levels in type 2 diabetes may be the effect of a reduced kidney function which is common in type 2 diabetes. Interestingly, during severe kidney dysfunction the molecular structure of RBP4 and TTR was altered in a specific manner which was not the case during liver diseases and type 2 diabetes. This underlines the important function of the kidneys in RBP4 metabolism. CRBP-I has been confirmed to be responsible for the ROH storage in the liver since CRBP-I knock-out mice had decreased ROH and retinylesters (the storage form of ROH) levels in the liver. Interestingly, in the adipose tissue (the second largest ROH storage tissue in the body) ROH and retinylesters levels were higher in the CRBP-I knock-out compared to the wild-type mice. It could be shown in this work that a different ROH binding protein, cellular retinol-binding protein type III, is upregulated in CRBP-I knock-out mice. Moreover enzymes were identified which mediate very efficiently ROH esterification in the adipose tissue of the knock-out mice. In the pancreas there was a higher postprandial ROH uptake in the CRBP-I knock-out compard to wild-type mice. Even under a vitamin A deficient diet the knock-out animals had ROH and retinylesters levels which were comparable to wild-type animals. These results underline the important role of ROH for insulin secretion in the pancreas. Summing up, there is evidence that RBP4 levels are more determined by kidney function than by type 2 diabetes and that specific molecular modifications occur during kidney dysfunction. The results in adipose tissue and pancreas of CRBP-I knock-out mice support the hypothesis that ROH plays an important role in glucose and lipid metabolism.