TY - JOUR A1 - De Frenne, P. A1 - Kolb, Annette A1 - Graae, Benete Jessen A1 - Decocq, Guillaume A1 - Baltora, S. A1 - De Schrijver, A. A1 - Brunet, J. A1 - Chabrerie, Olivier A1 - Cousins, Sara A. O. A1 - Dhondt, Rob A1 - Diekmann, Martin A1 - Gruwez, R. A1 - Heinken, Thilo A1 - Hermy, Martin A1 - Liira, J. A1 - Saguez, R. A1 - Shevtsova, Anna A1 - Baskin, Carol C. A1 - Verheyen, Kris T1 - A latitudinal gradient in seed nutrients of the forest herb Anemone nemorosa JF - Plant biology N2 - The nutrient concentration in seeds determines many aspects of potential success of the sexual reproductive phase of plants, including the seed predation probability, efficiency of seed dispersal and seedling performance. Despite considerable research interest in latitudinal gradients of foliar nutrients, a similar gradient for seeds remains unexplored. We investigated a potential latitudinal gradient in seed nutrient concentrations within the widespread European understorey forest herb Anemone nemorosa L. We sampled seeds of A. nemorosa in 15 populations along a 1900-km long latitudinal gradient at three to seven seed collection dates post-anthesis and investigated the relative effects of growing degree-hours > 5 degrees C, soil characteristics and latitude on seed nutrient concentrations. Seed nitrogen, nitrogen:phosphorus ratio and calcium concentration decreased towards northern latitudes, while carbon:nitrogen ratios increased. When taking differences in growing degree-hours and measured soil characteristics into account and only considering the most mature seeds, the latitudinal decline remained particularly significant for seed nitrogen concentration. We argue that the decline in seed nitrogen concentration can be attributed to northward decreasing seed provisioning due to lower soil nitrogen availability or greater investment in clonal reproduction. This pattern may have large implications for the reproductive performance of this forest herb as the degree of seed provisioning ultimately co-determines seedling survival and reproductive success. KW - Collection date KW - latitude KW - nutrient stoichiometry KW - seed nitrogen KW - seed predation KW - seed provisioning KW - sexual reproduction KW - wood anemone Y1 - 2011 U6 - https://doi.org/10.1111/j.1438-8677.2010.00404.x SN - 1435-8603 VL - 13 IS - 3 SP - 493 EP - 501 PB - Wiley-Blackwell CY - Malden ER - TY - JOUR A1 - Ebenhoeh, Oliver A1 - Houwaart, Torsten A1 - Lokstein, Heiko A1 - Schlede, Stephanie A1 - Tirok, Katrin T1 - A minimal mathematical model of nonphotochemical quenching of chlorophyll fluorescence JF - Biosystems : journal of biological and information processing sciences N2 - Under natural conditions, plants are exposed to rapidly changing light intensities. To acclimate to such fluctuations, plants have evolved adaptive mechanisms that optimally exploit available light energy and simultaneously minimise damage of the photosynthetic apparatus through excess light. An important mechanism is the dissipation of excess excitation energy as heat which can be measured as nonphotochemical quenching of chlorophyll fluorescence (NPQ). In this paper, we present a highly simplified mathematical model that captures essential experimentally observed features of the short term adaptive quenching dynamics. We investigate the stationary and dynamic behaviour of the model and systematically analyse the dependence of characteristic system properties on key parameters such as rate constants and pool sizes. Comparing simulations with experimental data allows to derive conclusions about the validity of the simplifying assumptions and we further propose hypotheses regarding the role of the xanthophyll cycle in NPQ. We envisage that the presented theoretical description of the light reactions in conjunction with short term adaptive processes serves as a basis for the development of more detailed mechanistic models by which the molecular mechanisms of NPQ can be theoretically studied. KW - Photosynthesis KW - Light reactions KW - Nonphotochemical quenching of chlorophyll fluorescence KW - Chlorophyll fluorescence KW - Mathematical model Y1 - 2011 U6 - https://doi.org/10.1016/j.biosystems.2010.10.011 SN - 0303-2647 VL - 103 IS - 2 SP - 196 EP - 204 PB - Elsevier CY - Oxford ER - TY - JOUR A1 - Bog, Anja A1 - Plattner, Hasso A1 - Zeier, Alexander T1 - A mixed transaction processing and operational reporting benchmark JF - Information systems frontiers N2 - The importance of reporting is ever increasing in today's fast-paced market environments and the availability of up-to-date information for reporting has become indispensable. Current reporting systems are separated from the online transaction processing systems (OLTP) with periodic updates pushed in. A pre-defined and aggregated subset of the OLTP data, however, does not provide the flexibility, detail, and timeliness needed for today's operational reporting. As technology advances, this separation has to be re-evaluated and means to study and evaluate new trends in data storage management have to be provided. This article proposes a benchmark for combined OLTP and operational reporting, providing means to evaluate the performance of enterprise data management systems for mixed workloads of OLTP and operational reporting queries. Such systems offer up-to-date information and the flexibility of the entire data set for reporting. We describe how the benchmark provokes the conflicts that are the reason for separating the two workloads on different systems. In this article, we introduce the concepts, logical data schema, transactions and queries of the benchmark, which are entirely based on the original data sets and real workloads of existing, globally operating enterprises. KW - Benchmarking KW - Mixed workload KW - OLTP KW - Operational reporting Y1 - 2011 U6 - https://doi.org/10.1007/s10796-010-9283-8 SN - 1387-3326 VL - 13 IS - 3 SP - 321 EP - 335 PB - Springer CY - Dordrecht ER - TY - JOUR A1 - Zaupa, Alessandro A1 - Neffe, Axel T. A1 - Pierce, Benjamin F. A1 - Lendlein, Andreas A1 - Hofmann, Dieter T1 - A molecular dynamic analysis of gelatin as an amorphous material Prediction of mechanical properties of gelatin systems JF - The international journal of artificial organs N2 - Biomaterials are used in regenerative medicine for induced autoregeneration and tissue engineering. This is often challenging, however, due to difficulties in tailoring and controlling the respective material properties. Since functionalization is expected to offer better control, in this study gelatin chains were modified with physically interacting groups based on tyrosine with the aim of causing the formation of physical crosslinks. This method permits application-specific properties like swelling and better tailoring of mechanical properties. The design of the crosslink strategy was supported by molecular dynamic (MD) simulations of amorphous bulk models for gelatin and functionalized gelatins at different water contents (0.8 and 25 wt.-%). The results permitted predictions to be formulated about the expected crosslink density and its influence on equilibrium swelling behavior and on elastic material properties. The models of pure gelatin were used to validate the strategy by comparison between simulated and experimental data such as density, backbone conformation angle distribution, and X-ray scattering spectra. A key result of the simulations was the prediction that increasing the number of aromatic functions attached to the gelatin chain leads to an increase in the number of physical netpoints observed in the simulated bulk packing models. By comparison with the Flory-Rehner model, this suggested reduced equilibrium swelling of the functionalized materials in water, a prediction that was subsequently confirmed by our experimental work. The reduction and control of the equilibrium degree of swelling in water is a key criterion for the applicability of functionalized gelatins when used, for example, as matrices for induced autoregeneration of tissues. KW - Physical Network KW - Biopolymer material KW - Molecular modeling KW - Gelatin Y1 - 2011 U6 - https://doi.org/10.5301/IJAO.2010.6083 SN - 0391-3988 VL - 34 IS - 2 SP - 139 EP - 151 PB - Wichtig CY - Milano ER - TY - JOUR A1 - Aksu, Yilmaz A1 - Frasca, Stefano A1 - Wollenberger, Ursula A1 - Driess, Matthias A1 - Thomas, Arne T1 - A molecular precursor approach to tunable porous tin-rich indium tin oxide with durable high electrical conductivity for bioelectronic devices JF - Chemistry of materials : a publication of the American Chemical Society N2 - The preparation of porous, i.e., high surface area electrodes from transparent conducting oxides, is a valuable goal in materials chemistry as such electrodes can enable further development of optoelectronic, electrocatalytic, or bioelectronic devices. In this work the first tin-rich mesoporous indium tin oxide is prepared using the molecular heterobimetallic single-source precursor, indium tin tris-tert-butoxide, together with an appropriate structure-directing template, yielding materials with high surface areas and tailorable pore size. The resulting mesoporous tin-rich ITO films show a high and durable electrical conductivity and transparency, making them interesting materials for hosting electroactive biomolecules such as proteins. In fact, its unique performance in bioelectronic applications has been demonstrated by immobilization of high amounts of cytochrome c into the mesoporous film which undergo redox processes directly with the conductive electrode material. KW - indium tin oxide ITO KW - electrode KW - bioelectrochemistry KW - device KW - cytochrome c Y1 - 2011 U6 - https://doi.org/10.1021/cm103087p SN - 0897-4756 VL - 23 IS - 7 SP - 1798 EP - 1804 PB - American Chemical Society CY - Washington ER - TY - JOUR A1 - Giese, Holger A1 - Henkler, Stefan A1 - Hirsch, Martin T1 - A multi-paradigm approach supporting the modular execution of reconfigurable hybrid systems JF - Simulation : transactions of the Society for Modeling and Simulation International N2 - Advanced mechatronic systems have to integrate existing technologies from mechanical, electrical and software engineering. They must be able to adapt their structure and behavior at runtime by reconfiguration to react flexibly to changes in the environment. Therefore, a tight integration of structural and behavioral models of the different domains is required. This integration results in complex reconfigurable hybrid systems, the execution logic of which cannot be addressed directly with existing standard modeling, simulation, and code-generation techniques. We present in this paper how our component-based approach for reconfigurable mechatronic systems, MECHATRONIC UML, efficiently handles the complex interplay of discrete behavior and continuous behavior in a modular manner. In addition, its extension to even more flexible reconfiguration cases is presented. KW - code generation KW - hybrid systems KW - reconfigurable systems KW - simulation Y1 - 2011 U6 - https://doi.org/10.1177/0037549710366824 SN - 0037-5497 VL - 87 IS - 9 SP - 775 EP - 808 PB - Sage Publ. CY - London ER - TY - JOUR A1 - Shin, Seoleun A1 - Zöller, Gert A1 - Holschneider, Matthias A1 - Reich, Sebastian T1 - A multigrid solver for modeling complex interseismic stress fields JF - Computers & geosciences : an international journal devoted to the publication of papers on all aspects of geocomputation and to the distribution of computer programs and test data sets ; an official journal of the International Association for Mathematical Geology N2 - We develop a multigrid, multiple time stepping scheme to reduce computational efforts for calculating complex stress interactions in a strike-slip 2D planar fault for the simulation of seismicity. The key elements of the multilevel solver are separation of length scale, grid-coarsening, and hierarchy. In this study the complex stress interactions are split into two parts: the first with a small contribution is computed on a coarse level, and the rest for strong interactions is on a fine level. This partition leads to a significant reduction of the number of computations. The reduction of complexity is even enhanced by combining the multigrid with multiple time stepping. Computational efficiency is enhanced by a factor of 10 while retaining a reasonable accuracy, compared to the original full matrix-vortex multiplication. The accuracy of solution and computational efficiency depend on a given cut-off radius that splits multiplications into the two parts. The multigrid scheme is constructed in such a way that it conserves stress in the entire half-space. KW - Multigrid KW - Multiple time stepping KW - Strike-slip fault model Y1 - 2011 U6 - https://doi.org/10.1016/j.cageo.2010.11.011 SN - 0098-3004 VL - 37 IS - 8 SP - 1075 EP - 1082 PB - Elsevier CY - Oxford ER - TY - JOUR A1 - Belova, Valentina A1 - Shchukin, Dmitry G. A1 - Gorin, Dmitry A. A1 - Kopyshev, Alexey A1 - Moehwald, Helmuth T1 - A new approach to nucleation of cavitation bubbles at chemically modified surfaces JF - Physical chemistry, chemical physics : a journal of European Chemical Societies N2 - Cavitation at the solid surface normally begins with nucleation, in which defects or assembled molecules located at a liquid-solid interface act as nucleation centers and are actively involved in the evolution of cavitation bubbles. Here, we propose a simple approach to evaluate the behavior of cavitation bubbles formed under high intensity ultrasound (20 kHz, 51.3 W cm (2)) at solid surfaces, based on sonication of patterned substrates with a small roughness (less than 3 nm) and controllable surface energy. A mixture of octadecylphosphonic acid (ODTA) and octadecanethiol (ODT) was stamped on the Si wafer coated with different thicknesses of an aluminium layer (20-500 nm). We investigated the growth mechanism of cavitation bubble nuclei and the evolution of individual pits (defects) formed under sonication on the modified surface. A new activation behavior as a function of Al thickness, sonication time, ultrasonic power and temperature is reported. In this process cooperativity is introduced, as initially formed pits further reduce the energy to form bubbles. Furthermore, cavitation on the patterns is a controllable process, where up to 40-50 min of sonication time only the hydrophobic areas are active nucleation sites. This study provides a convincing proof of our theoretical approach on nucleation. Y1 - 2011 U6 - https://doi.org/10.1039/c1cp20218a SN - 1463-9076 VL - 13 IS - 17 SP - 8015 EP - 8023 PB - Royal Society of Chemistry CY - Cambridge ER - TY - JOUR A1 - Wessig, Pablo A1 - Wawrzinek, Robert A1 - Moellnitz, Kristian A1 - Feldbusch, Elvira A1 - Schilde, Uwe T1 - A new class of fluorescent dyes based on 1,3-benzodioxole and [1,3]-dioxolo[4.5-f]benzodioxole JF - Tetrahedron letters N2 - We report on synthesis and photophysical properties of a new class of fluorescent dyes. They are characterized by large Stokes-shifts, long fluorescence lifetimes in organic solvents and a pronounced dependency of the fluorescence lifetime on the solvent polarity. Also worthy of note is the high bleaching stability. To provide access to biochemical and medical applications a series of derivatives were prepared, which exhibit specific reactivity towards different biologically relevant functional groups (carboxylic acids, amines, maleimides, N-hydroxysuccinimide esters). Furthermore, two alkynes were prepared, which could be used in 'Click' chemistry. KW - Fluorescent dyes KW - Fluorescence lifetime KW - Large Stokes-shifts KW - Heterocycles Y1 - 2011 U6 - https://doi.org/10.1016/j.tetlet.2011.09.058 SN - 0040-4039 VL - 52 IS - 46 SP - 6192 EP - 6195 PB - Elsevier CY - Oxford ER - TY - JOUR A1 - Stahlberg, Tim A1 - Lahmann, Henning T1 - A Paradigm of Prevention Humpty Dumpty, the War on Terror, and the Power of Preventive Detention in the United States, Israel, and Europe JF - The American journal of comparative law N2 - A decade into the proclaimed "global war on terror," states are still struggling with the phenomenon's locus and definition under the effective laws. Remarkably, preventive detention of suspected terrorists fluctuates between various legal regimes: In Europe, criminal law is predominantly used but special security orders are occasionally issued as well; Israel applies in part the law of international armed conflicts; and in the United States, detention under a new war premise has been claimed. This Article analyzes the response of the U.S. Supreme Court, the Israeli Supreme Court, and the European Court of Human Rights to legislative and executive policies asserting the power of preventive detention in the aftermath of September 11, 2001. The comparison exposes significant differences with regard to the application of international law, and most prominently concerning the underlying question of whether the struggle against terrorism should be considered a "war," or, perhaps more traditionally, a fight against crime. Despite the substantial discrepancies in these three jurisdictions, this Article argues that the similarities are actually more striking. Whereas no court has accepted any attempt to fight terrorism outside the bounds of law, the judges have not hesitated to stretch and blur the pertinent frameworks by extensive interpretation. Ultimately, it is questionable whether on account of the individual's rights the resulting flexibilities and uncertainties are justifiable. "I don't know what you mean by 'glory'," Alice said. Humpty Dumpty smiled contemptuously. "Of course you don't till I tell you. I meant 'there's a nice knock-down argument for you!" "But 'glory' doesn't mean 'a nice knock-down argument" Alice objected. "When I use a word," Humpty Dumptysaid, in rather a scornful tone, "it means just what I choose it to mean - neither more nor less." "The question is," said Alice, "whether you can make words mean different things." "The question is," said Humpty Dumpty, "which is to be master that's all." Y1 - 2011 U6 - https://doi.org/10.5131/AJCL.2010.0034 SN - 0002-919X VL - 59 IS - 4 SP - 1051 EP - 1087 PB - American Society of Comparative Law CY - Berkeley ER - TY - JOUR A1 - Mann, R. B. A1 - Young, M. B. A1 - Fuüntes-Schuller, I. T1 - A perturbative approach to inelastic collisions in a Bose-Einstein condensate JF - Journal of physics : B, Atomic, molecular and optical physics N2 - It has recently been discovered that for certain rates of mode-exchange collisions analytic solutions can be found for a Hamiltonian describing the two-mode Bose-Einstein condensate. We proceed to study the behaviour of the system using perturbation theory if the coupling constants only approximately match these parameter constraints. We find that the model is robust to such perturbations. We study the effects of degeneracy on the perturbations and find that the induced changes differ greatly from the non-degenerate case. We also model inelastic collisions that result in particle loss or condensate decay as external perturbations and use this formalism to examine the effects of three-body recombination and background collisions. Y1 - 2011 U6 - https://doi.org/10.1088/0953-4075/44/8/085301 SN - 0953-4075 VL - 44 IS - 8 PB - IOP Publ. Ltd. CY - Bristol ER - TY - THES A1 - Schönheit, Jörg T1 - A phagocyte-specific Irf8 gene enhancer establishes early conventional dendritic cell commitment T1 - Ein Phagozyten spezifischer Enhancer des Irf8 Gens steuert die Entwicklung konventioneller dendritischer Zellen N2 - Haematopoietic development is a complex process that is strictly hierarchically organized. Here, the phagocyte lineages are a very heterogeneous cell compartment with specialized functions in innate immunity and induction of adaptive immune responses. Their generation from a common precursor must be tightly controlled. Interference within lineage formation programs for example by mutation or change in expression levels of transcription factors (TF) is causative to leukaemia. However, the molecular mechanisms driving specification into distinct phagocytes remain poorly understood. In the present study I identify the transcription factor Interferon Regulatory Factor 8 (IRF8) as the specification factor of dendritic cell (DC) commitment in early phagocyte precursors. Employing an IRF8 reporter mouse, I showed the distinct Irf8 expression in haematopoietic lineage diversification and isolated a novel bone marrow resident progenitor which selectively differentiates into CD8α+ conventional dendritic cells (cDCs) in vivo. This progenitor strictly depends on Irf8 expression to properly establish its transcriptional DC program while suppressing a lineage-inappropriate neutrophile program. Moreover, I demonstrated that Irf8 expression during this cDC commitment-step depends on a newly discovered myeloid-specific cis-enhancer which is controlled by the haematopoietic transcription factors PU.1 and RUNX1. Interference with their binding leads to abrogation of Irf8 expression, subsequently to disturbed cell fate decisions, demonstrating the importance of these factors for proper phagocyte cell development. Collectively, these data delineate a transcriptional program establishing cDC fate choice with IRF8 in its center. N2 - Die Differenzierung von hämatopoietischen Zellen ist ein komplexer Prozess, der strikt hierarchisch organisiert ist. Dabei stellen die Phagozyten eine sehr heterogene Zellpopulation dar, mit hochspezialisierten Funktionen im angeborenen Immunsystem sowie während der Initialisierung der adaptiven Immunreaktion. Ihre Entwicklung, ausgehend von einer gemeinsamen Vorläuferzelle, unterliegt einer strikten Kontrolle. Die Beeinträchtigung dieser Linienentscheidungsprogramme, z.B. durch Mutationen oder Änderungen der Expressionslevel von Transkriptionsfaktoren kann Leukämie auslösen. Die molekularen Mechanismen, welche die linienspezifische Entwicklung steuern, sind allerdings noch nicht im Detail bekannt. In dieser Arbeit zeige ich den maßgeblichen Einfluss des Transkriptionsfaktors Interferon Regulierender Faktor 8 (IRF8) auf die Entwicklung von dendritischen Zellen (DC) innerhalb der Phagozyten. Mittels einer IRF8-Reporter Maus stellte ich die sehr differenziellen Expressionsmuster von Irf8 in der hämatopoietischen Entwicklung dar. Dabei konnte ich eine neue, im Knochenmark lokalisierte, Vorläuferpopulation isolieren, die in vivo spezifisch Differenzierung in CD8α+ konventionelle dendritische Zellen (cDC) steuert. Dieser Vorläufer ist dabei absolut von der Expression von Irf8 abhängig und etabliert auf transkriptioneller Ebene die dendritische Zellentwicklung, während gleichzeitig die Entwicklung neutrophiler Zellen unterdrückt wird. Darüber hinaus zeigte ich, dass Irf8 Expression während der cDC Entwicklung von einem neu charakterisierten cis-regulatorischen Enhancer abhängt, der spezifisch in myeloiden Zellen agiert. Ich konnte zeigen, dass die hämatopoietischen Transkriptionfaktoren PU.1 und RUNX1 mittels dieses Enhancers die Irf8 Expression steuern. Können diese beiden Faktoren nicht mit dem Enhancer interagieren, führt das zu stark verminderter Irf8 Expression, damit zu Veränderungen in den Differnzierungsprogrammen der Zellen, was die Bedeutung dieses regulatorischen Mechanismus unterstreicht. Zusammengefasst beschreiben diese Daten die Etablierung der frühen cDC Entwicklung, in der IRF8 die zentrale Rolle spielt. KW - Hämatopoiese KW - dendritische Zelle KW - Immunologie KW - Transkiptionsfaktor KW - Genregulation KW - haematopoiesis KW - dendritic cell KW - immunology KW - transcription factor KW - gene regulation Y1 - 2011 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-55482 ER - TY - JOUR A1 - Liaimer, Anton A1 - Jenke-Kodama, Holger A1 - Ishida, Keishi A1 - Hinrichs, Katrin A1 - Stangeland, Janne A1 - Hertweck, Christian A1 - Dittmann-Thünemann, Elke T1 - A polyketide interferes with cellular differentiation in the symbiotic cyanobacterium Nostoc punctiforme JF - Environmental microbiology reports N2 - Nostoc punctiforme is a filamentous cyanobacterium capable of forming symbiotic associations with a wide range of plants. The strain exhibits extensive phenotypic characteristics and can differentiate three mutually exclusive cell types: nitrogen-fixing heterocysts, motile hormogonia and spore-like akinetes. Here, we provide evidence for a crucial role of an extracellular metabolite in balancing cellular differentiation. Insertional mutagenesis of a gene of the polyketide synthase gene cluster pks2 led to the accumulation of short filaments carrying mostly terminal heterocysts under diazotrophic conditions. The mutant has a strong tendency to form biofilms on solid surfaces as well as in liquid culture. The pks2-strain keeps forming hormogonia over the entire growth curve and shows an early onset of akinete formation. We could isolate two fractions of the wildtype supernatant that could restore the capability to form long filaments with intercalary heterocysts. Growth of the mutant cells in the neighbourhood of wild-type cells on plates led to a reciprocal influence and a partial reconstruction of wild-type and mutant phenotype respectively. We postulate that extracellular metabolites of Nostoc punctiforme act as life cycle governing factors (LCGFs) and that the ratio between distinct factors may guide the differentiation into different life stages. Y1 - 2011 U6 - https://doi.org/10.1111/j.1758-2229.2011.00258.x SN - 1758-2229 VL - 3 IS - 5 SP - 550 EP - 558 PB - Wiley-Blackwell CY - Malden ER - TY - JOUR A1 - Neumann, Mike A1 - Noeske, Robert A1 - Bach, Grete A1 - Glaubauf, Thomas A1 - Bartoszek, Michael A1 - Strauch, Peter T1 - A procedure for rapid determination of the silicon content in plant materials JF - Zeitschrift für Naturforschung : B, Chemical sciences N2 - An efficient, reliable and low-cost procedure to determine the silicon content in plant material is presented which allows to monitor the agricultural aspects like growth and yield. The presented procedure consists of a hydrochloric acid pre-treatment and a subsequent thermal oxidation. The method is compared to other processes like dissolution in hydrofluoric acid combined with ICP OES, energy-dispersive X-ray fluorescence spectroscopy (EDXRF) or aqua regia treatment. KW - Silica Determination KW - Silicon Content KW - Plant Material Y1 - 2011 SN - 0932-0776 VL - 66 IS - 3 SP - 289 EP - 294 PB - De Gruyter CY - Tübingen ER - TY - JOUR A1 - Helfert, Susanne A1 - Warschburger, Petra T1 - A prospective study on the impact of peer and parental pressure on body dissatisfaction in adolescent girls and boys JF - Body image : an international journal of research N2 - The current study explores the role of appearance-related social pressure regarding changes in body image in adolescent girls (n = 236) and boys (n = 193) over a 1-year-period. High school students aged 11-16 completed measures of body dissatisfaction (i.e., weight and muscle concerns) and appearance-related social pressure from peers and parents. Three aspects proved to be particularly crucial: Parental encouragement to control weight and shape was a strong predictor of weight concerns in boys and girls alike; influences of friends affected gender-specific body image concerns by leading to weight concerns in girls and muscle concerns in boys; finally appearance-based exclusion was a predictor of weight concerns in boys. The findings provide longitudinal evidence for the crucial impact of appearance-related social pressure and suggest that a detailed assessment of different types of social impacts can identify concrete targets for effective prevention and therapy for weight-related problems among adolescents. KW - Adolescence KW - Peer pressure KW - Parental pressure KW - Weight and muscle concerns KW - Body dissatisfaction KW - Longitudinal Y1 - 2011 U6 - https://doi.org/10.1016/j.bodyim.2011.01.004 SN - 1740-1445 VL - 8 IS - 2 SP - 101 EP - 109 PB - Elsevier CY - Amsterdam ER - TY - JOUR A1 - Arnold, Anne A1 - Nikoloski, Zoran T1 - A quantitative comparison of Calvin-Benson cycle models JF - Trends in plant science N2 - The Calvin-Benson cycle (CBC) provides the precursors for biomass synthesis necessary for plant growth. The dynamic behavior and yield of the CBC depend on the environmental conditions and regulation of the cellular state. Accurate quantitative models hold the promise of identifying the key determinants of the tightly regulated CBC function and their effects on the responses in future climates. We provide an integrative analysis of the largest compendium of existing models for photosynthetic processes. Based on the proposed ranking, our framework facilitates the discovery of best-performing models with regard to metabolomics data and of candidates for metabolic engineering. Y1 - 2011 U6 - https://doi.org/10.1016/j.tplants.2011.09.004 SN - 1360-1385 VL - 16 IS - 12 SP - 676 EP - 683 PB - Elsevier CY - London ER - TY - THES A1 - Zhang, Zhuodong T1 - A regional scale study of wind erosion in the Xilingele grassland based on computational fluid dynamics Y1 - 2011 CY - Potsdam ER - TY - JOUR A1 - Postberg, Frank A1 - Schmidt, J. A1 - Hillier, J. A1 - Kempf, Sascha A1 - Srama, Ralf T1 - A salt-water reservoir as the source of a compositionally stratified plume on Enceladus JF - Nature : the international weekly journal of science N2 - The discovery of a plume of water vapour and ice particles emerging from warm fractures ('tiger stripes') in Saturn's small, icy moon Enceladus(1-6) raised the question of whether the plume emerges from a subsurface liquid source(6-8) or from the decomposition of ice(9-12). Previous compositional analyses of particles injected by the plume into Saturn's diffuse E ring have already indicated the presence of liquid water(8), but the mechanisms driving the plume emission are still debated(13). Here we report an analysis of the composition of freshly ejected particles close to the sources. Salt-rich ice particles are found to dominate the total mass flux of ejected solids (more than 99 per cent) but they are depleted in the population escaping into Saturn's E ring. Ice grains containing organic compounds are found to be more abundant in dense parts of the plume. Whereas previous Cassini observations were compatible with a variety of plume formation mechanisms, these data eliminate or severely constrain non-liquid models and strongly imply that a salt-water reservoir with a large evaporating surface(7,8) provides nearly all of the matter in the plume. Y1 - 2011 U6 - https://doi.org/10.1038/nature10175 SN - 0028-0836 VL - 474 IS - 7353 SP - 620 EP - 622 PB - Nature Publ. Group CY - London ER - TY - JOUR A1 - Kühne, Ralph A1 - Huitema, George A1 - Carle, Georg T1 - A simple distributed mechanism for accounting system self-configuration in next-generation charging and billing JF - Computer communications N2 - Modern communication systems are becoming increasingly dynamic and complex. In this article a novel mechanism for next generation charging and billing is presented that enables self-configurability for accounting systems consisting of heterogeneous components. The mechanism is required to be simple, effective, efficient, scalable and fault-tolerant. Based on simulation results it is shown that the proposed simple distributed mechanism is competitive with usual cost-based or random mechanisms under realistic assumptions and up to non-extreme workload situations as well as fulfilling the posed requirements. KW - Charging KW - Billing KW - Accounting KW - Self-configuration KW - Communication systems Y1 - 2011 U6 - https://doi.org/10.1016/j.comcom.2010.10.012 SN - 0140-3664 VL - 34 IS - 7 SP - 898 EP - 920 PB - Elsevier CY - Amsterdam ER - TY - JOUR A1 - Schmidt, Bernd A1 - Krehl, Stefan T1 - A single precatalyst tandem RCM-allylic oxidation sequence JF - Chemical communications N2 - Ring closing metathesis of allyloxy styrenes and a subsequent Ru-catalyzed allylic oxidation can be combined to a tandem sequence that makes coumarins accessible using less active but more conveniently available first generation catalysts. Y1 - 2011 U6 - https://doi.org/10.1039/c1cc11347j SN - 1359-7345 VL - 47 IS - 20 SP - 5879 EP - 5881 PB - Royal Society of Chemistry CY - Cambridge ER - TY - JOUR A1 - Ette, Ottmar T1 - A snapshot of life of traveller painters evil literature and summary writing in cesar aira JF - Insula : revista de letras y ciencias humanas Y1 - 2011 SN - 0020-4536 VL - 66 IS - 777 SP - 9 EP - 12 PB - Insula CY - Pozuelo de Alarcon ER - TY - JOUR A1 - Beye, Martin A1 - Föhlisch, Alexander T1 - A soft X-ray approach to electron-phonon interactions beyond the Born-Oppenheimer approximation JF - Journal of electron spectroscopy and related phenomena : the international journal on theoretical and experimental aspects of electron spectroscopy N2 - With modern soft X-ray methods, the whole field of electron-phonon interactions becomes accessible directly in the ultrafast time domain with ultrashort pulsed X-ray sources, as well as in the energy domain through modern highly resolving spectrometers. The well-known core-hole clock approach plays an intermediate role, resolving energetic and temporal features at the same time. In this perspective paper, we review several experiments to illustrate the modern advances in the selective study of electron-phonon interactions as fundamentally determining ingredients for materials properties. We present the different complementary approaches that can be taken with soft X-ray methods to conquer this field beyond the Born-Oppenheimer approximation. KW - Electron-phonon coupling KW - Resonant inelastic X-ray scattering KW - X-ray emission spectroscopy KW - Near edge X-ray absorption fine structure Y1 - 2011 U6 - https://doi.org/10.1016/j.elspec.2010.12.032 SN - 0368-2048 VL - 184 IS - 3-6 SP - 313 EP - 317 PB - Elsevier CY - Amsterdam ER - TY - THES A1 - Andorf, Sandra T1 - A systems biological approach towards the molecular basis of heterosis in Arabidopsis thaliana T1 - Ein systembiologischer Ansatz für das Verständnis der molekularen Grundlagen von Heterosis in Arabidopsis thaliana N2 - Heterosis is defined as the superiority in performance of heterozygous genotypes compared to their corresponding genetically different homozygous parents. This phenomenon is already known since the beginning of the last century and it has been widely used in plant breeding, but the underlying genetic and molecular mechanisms are not well understood. In this work, a systems biological approach based on molecular network structures is proposed to contribute to the understanding of heterosis. Hybrids are likely to contain additional regulatory possibilities compared to their homozygous parents and, therefore, they may be able to correctly respond to a higher number of environmental challenges, which leads to a higher adaptability and, thus, the heterosis phenomenon. In the network hypothesis for heterosis, presented in this work, more regulatory interactions are expected in the molecular networks of the hybrids compared to the homozygous parents. Partial correlations were used to assess this difference in the global interaction structure of regulatory networks between the hybrids and the homozygous genotypes. This network hypothesis for heterosis was tested on metabolite profiles as well as gene expression data of the two parental Arabidopsis thaliana accessions C24 and Col-0 and their reciprocal crosses. These plants are known to show a heterosis effect in their biomass phenotype. The hypothesis was confirmed for mid-parent and best-parent heterosis for either hybrid of our experimental metabolite as well as gene expression data. It was shown that this result is influenced by the used cutoffs during the analyses. Too strict filtering resulted in sets of metabolites and genes for which the network hypothesis for heterosis does not hold true for either hybrid regarding mid-parent as well as best-parent heterosis. In an over-representation analysis, the genes that show the largest heterosis effects according to our network hypothesis were compared to genes of heterotic quantitative trait loci (QTL) regions. Separately for either hybrid regarding mid-parent as well as best-parent heterosis, a significantly larger overlap between the resulting gene lists of the two different approaches towards biomass heterosis was detected than expected by chance. This suggests that each heterotic QTL region contains many genes influencing biomass heterosis in the early development of Arabidopsis thaliana. Furthermore, this integrative analysis led to a confinement and an increased confidence in the group of candidate genes for biomass heterosis in Arabidopsis thaliana identified by both approaches. N2 - Als Heterosis-Effekt wird die Überlegenheit in einem oder mehreren Leistungsmerkmalen (z.B. Blattgröße von Pflanzen) von heterozygoten (mischerbigen) Nachkommen über deren unterschiedlich homozygoten (reinerbigen) Eltern bezeichnet. Dieses Phänomen ist schon seit Beginn des letzten Jahrhunderts bekannt und wird weit verbreitet in der Pflanzenzucht genutzt. Trotzdem sind die genetischen und molekularen Grundlagen von Heterosis noch weitestgehend unbekannt. Es wird angenommen, dass heterozygote Individuen mehr regulatorische Möglichkeiten aufweisen als ihre homozygoten Eltern und sie somit auf eine größere Anzahl an wechselnden Umweltbedingungen richtig reagieren können. Diese erhöhte Anpassungsfähigkeit führt zum Heterosis-Effekt. In dieser Arbeit wird ein systembiologischer Ansatz, basierend auf molekularen Netzwerkstrukturen verfolgt, um zu einem besseren Verständnis von Heterosis beizutragen. Dazu wird eine Netzwerkhypothese für Heterosis vorgestellt, die vorhersagt, dass die heterozygoten Individuen, die Heterosis zeigen, mehr regulatorische Interaktionen in ihren molekularen Netzwerken aufweisen als die homozygoten Eltern. Partielle Korrelationen wurden verwendet, um diesen Unterschied in den globalen Interaktionsstrukturen zwischen den Heterozygoten und ihren homozygoten Eltern zu untersuchen. Die Netzwerkhypothese wurde anhand von Metabolit- und Genexpressionsdaten der beiden homozygoten Arabidopsis thaliana Pflanzenlinien C24 und Col-0 und deren wechselseitigen Kreuzungen getestet. Arabidopsis thaliana Pflanzen sind bekannt dafür, dass sie einen Heterosis-Effekt im Bezug auf ihre Biomasse zeigen. Die heterozygoten Pflanzen weisen bei gleichem Alter eine höhere Biomasse auf als die homozygoten Pflanzen. Die Netzwerkhypothese für Heterosis konnte sowohl im Bezug auf mid-parent Heterosis (Unterschied in der Leistung des Heterozygoten im Vergleich zum Mittelwert der Eltern) als auch auf best-parent Heterosis (Unterschied in der Leistung des Heterozygoten im Vergleich zum Besseren der Eltern) für beide Kreuzungen für die Metabolit- und Genexpressionsdaten bestätigt werden. In einer Überrepräsentations-Analyse wurden die Gene, für die die größte Veränderung in der Anzahl der regulatorischen Interaktionen, an denen sie vermutlich beteiligt sind, festgestellt wurde, mit den Genen aus einer quantitativ genetischen (QTL) Analyse von Biomasse-Heterosis in Arabidopsis thaliana verglichen. Die ermittelten Gene aus beiden Studien zeigen eine größere Überschneidung als durch Zufall erwartet. Das deutet darauf hin, dass jede identifizierte QTL-Region viele Gene, die den Biomasse-Heterosis-Effekt in Arabidopsis thaliana beeinflussen, enthält. Die Gene, die in den Ergebnislisten beider Analyseverfahren überlappen, können mit größerer Zuversicht als Kandidatengene für Biomasse-Heterosis in Arabidopsis thaliana betrachtet werden als die Ergebnisse von nur einer Studie. KW - Systembiologie KW - Heterosis KW - Molekulare Profildaten KW - Integrative Analyse KW - Systems biology KW - Heterosis KW - Molecular profile data KW - Integrative analysis Y1 - 2011 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-51173 ER - TY - JOUR A1 - Spies, Dennis A1 - Franzmann, Simon T. T1 - A two-dimensional approach to the political opportunity structure of extreme right parties in Western Europe JF - West European politics N2 - Previous studies on the electoral fortunes of extreme right parties (ERPs) have pointed to the importance of variables of party competition for the success - or failure - of ERPs. These studies vary greatly when it comes to describing the political opportunity structure of the extreme right. Apart from their methodological differences, existing studies differ especially with regard to the assumed underlying dimension of party competition. This article tests the impact of three frequently discussed variables in the political opportunity structure of ERPs (mainstream party convergence, position of the established right and party system polarisation) on the vote share of ERPs in Western Europe. In addition to examining previous studies in this field, it focuses on the interplay between the economic and the cultural dimensions as part of the political opportunity structure. The authors show that a decrease in polarisation with regard to economic questions is accompanied by a growing salience of ERPs' core issues, leading in the end to an increase in ERPs' vote share. Y1 - 2011 U6 - https://doi.org/10.1080/01402382.2011.591096 SN - 0140-2382 VL - 34 IS - 5 SP - 1044 EP - 1069 PB - Routledge, Taylor & Francis Group CY - Abingdon ER - TY - JOUR A1 - Schweizer, Geoffrey A1 - Plessner, Henning A1 - Kahlert, Daniela A1 - Brand, Ralf T1 - A Video-Based training method for improving soccer referees' intuitive decision-making skills JF - Journal of applied sport psychology N2 - We present a video-based online training-tool (SET, for Schiedsrichter-Entscheidungs-Training, in German) for improving soccer referees' decisions. We assume that referees' decision-making in contact situations mainly relies on intuitive processing. For improving intuitive decisions, feedback on the correctness of decisions is essential; explanations are not required (Hogarth, 2008). Referees participating in SET watch videos, make decisions, and receive feedback. Evidence of the training's effectiveness was obtained in two experiments with soccer players and expert referees. Immediate feedback on the correctness of decisions without further explanations was sufficient for increasing decision accuracy. Results illustrate that SET is a promising tool for complementing referees' training. Y1 - 2011 U6 - https://doi.org/10.1080/10413200.2011.555346 SN - 1041-3200 VL - 23 IS - 4 SP - 429 EP - 442 PB - Routledge, Taylor & Francis Group CY - Abingdon ER - TY - JOUR A1 - Kröner, Dominik A1 - Ehlert, Christopher A1 - Saalfrank, Peter A1 - Holländer, Andreas T1 - Ab initio calculations for XPS chemical shifts of poly(vinyl-trifluoroacetate) using trimer models JF - Surface science N2 - X-ray photoelectron spectra (XPS) of the polymer poly(vinyl-trifluoroacetate) show C(1s) binding energy shifts which are unusual because they are influenced by atoms which are several bonds away from the probed atom. In this work, the influence of the trifluoroacetate substituent on the 1s ionization potential of the carbon atoms of the polyethylene chain is investigated theoretically using mono-substituted, diad and triad models of trimers representing the polymer. Carbon 1s ionization energies are calculated by the Hartree-Fock theory employing Koopmans' theorem. The influence of the configuration and conformation of the functional groups as well as the degree of substitution are found to be important determinants of XPS spectra. It is further found that the 1s binding energy correlates in a linear fashion, with the total electrostatic potential at the position of the probe atom, and depends not only on nearest neighbor effects. This may have implications for the interpretation of high-resolution XP spectra. KW - Ab initio quantum chemical methods and calculations KW - X-ray photoelectron spectroscopy KW - Insulating films Y1 - 2011 U6 - https://doi.org/10.1016/j.susc.2011.05.021 SN - 0039-6028 VL - 605 IS - 15-16 SP - 1516 EP - 1524 PB - Elsevier CY - Amsterdam ER - TY - THES A1 - Oppenheim, Robert T1 - Abfindungsklauseln in Personengesellschaftverträgen : Plädoyer für eine Verhandlungsklausel T2 - Nomos Universitätsschriften : Recht Y1 - 2011 SN - 978-3-8329-6509-9 VL - 728 PB - Nomos CY - Baden-Baden ER - TY - GEN A1 - Guerrero, Martín A. A1 - Chu, You-Hua A1 - Hamann, Wolf-Rainer A1 - Oskinova, Lidia M. A1 - Schönberner, Detlef A1 - Todt, Helge Tobias A1 - Steffen, Matthias A1 - Ruiz, Nieves A1 - Gruendl, Robert A. A1 - Blair, William P. T1 - Ablation and wind mass-loading in the born-again planetary nebula A 30 T2 - Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe N2 - We present XMM-Newton and Chandra observations of the born-again planetary nebula A 30. These X-ray observations reveal a bright unresolved source at the position of the central star whose X-ray luminosity exceeds by far the model expectations for photospheric emission and for shocks within the stellar wind. We suggest that a “born-again hot bubble” may be responsible for this X-ray emission. Diffuse X-ray emission associated with the petal-like features and one of the H-poor knots seen in the optical is also found. The weakened emission of carbon lines in the spectrum of the diffuse emission can be interpreted as the dilution of stellar wind by mass-loading or as the detection of material ejected during a very late thermal pulse. T3 - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 563 KW - planetary nebulae: individual (A 30) KW - X-rays: ISM Y1 - 2019 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-412341 SN - 1866-8372 IS - 563 ER - TY - THES A1 - Neigenfind, Jost T1 - About a refined algorithm for the computation of absolute concentration robustness Y1 - 2011 CY - Potsdam ER - TY - JOUR A1 - Dallapiazza, Michael T1 - Abraham Sutzkever, Geh über Wörter wie über ein Minenfeld : Lyrik und Prosa. - (Campus Judaica ; 25) / [rezensiert von] Michael Dallapiazza JF - PaRDeS : Zeitschrift der Vereinigung für Jüdische Studien e.V. N2 - rezensiertes Werk: Sutzkever, Abraham: Geh über Wörter wie über ein Minenfeld : Lyrik und Prosa. - Einl. von Heather Valencia. Ausw., Übers. und Anm. von Peter Comans. - Frankfurt [u.a.] : Campus Verlag, 2009. - 389 S.. - (Campus Judaica ; 25) ISBN 978-3-593-38906-6 Y1 - 2011 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-53607 SN - 1614-6492 SN - 1862-7684 IS - 17 SP - 289 EP - 291 ER - TY - JOUR A1 - Gogolin, Christian A1 - Müller, Markus P. A1 - Eisert, Jens T1 - Absence of thermalization in nonintegrable systems JF - Physical review letters N2 - We establish a link between unitary relaxation dynamics after a quench in closed many-body systems and the entanglement in the energy eigenbasis. We find that even if reduced states equilibrate, they can have memory on the initial conditions even in certain models that are far from integrable. We show that in such situations the equilibrium states are still described by a maximum entropy or generalized Gibbs ensemble, regardless of whether a model is integrable or not, thereby contributing to a recent debate. In addition, we discuss individual aspects of the thermalization process, comment on the role of Anderson localization, and collect and compare different notions of integrability. Y1 - 2011 U6 - https://doi.org/10.1103/PhysRevLett.106.040401 SN - 0031-9007 VL - 106 IS - 4 PB - American Physical Society CY - College Park ER - TY - JOUR A1 - Tepper-Garcia, Thorsten A1 - Richter, Philipp A1 - Schaye, Joop A1 - Booth, C. M. A1 - Vecchia, Claudio Dalla A1 - Theuns, Tom A1 - Wiersma, Robert P. C. T1 - Absorption signatures of warm-hot gas at low redshift o vi JF - Monthly notices of the Royal Astronomical Society N2 - We investigate the origin and physical properties of O vi absorbers at low redshift (z = 0.25) using a subset of cosmological, hydrodynamical simulations from the OverWhelmingly Large Simulations (OWLS) project. Intervening O vi absorbers are believed to trace shock-heated gas in the warm-hot intergalactic medium (WHIM) and may thus play a key role in the search for the missing baryons in the present-day Universe. When compared to observations, the predicted distributions of the different O vi line parameters (column density, Doppler parameter, rest equivalent width W-r) from our simulations exhibit a lack of strong O vi absorbers, a discrepancy that has also been found by Oppenheimer & Dave. This suggests that physical processes on subgrid scales (e.g. turbulence) may strongly influence the observed properties of O vi systems. We find that the intervening O vi absorption arises mainly in highly metal enriched (10-1 < Z/Z(circle dot) less than or similar to 1) gas at typical overdensities of 1 < /<<>> less than or similar to 102. One-third of the O vi absorbers in our simulation are found to trace gas at temperatures T < 105 K, while the rest arises in gas at higher temperatures, most of them around T = 105.3 +/- 0.5 K. These temperatures are much higher than inferred by Oppenheimer & Dave, probably because that work did not take the suppression of metal-line cooling by the photoionizing background radiation into account. While the O vi resides in a similar region of (, T)-space as much of the shock-heated baryonic matter, the vast majority of this gas has a lower metal content and does not give rise to detectable O vi absorption. As a consequence of the patchy metal distribution, O vi absorbers in our simulations trace only a very small fraction of the cosmic baryons (< 2 per cent) and the cosmic metals. Instead, these systems presumably trace previously shock-heated, metal-rich material from galactic winds that is now mixing with the ambient gas and cooling. The common approach of comparing O vi and H i column densities to estimate the physical conditions in intervening absorbers from QSO observations may be misleading, as most of the H i (and most of the gas mass) is not physically connected with the high-metallicity patches that give rise to the O vi absorption. KW - methods: numerical KW - galaxies: formation KW - intergalactic medium KW - quasars: absorption lines KW - cosmology: theory Y1 - 2011 U6 - https://doi.org/10.1111/j.1365-2966.2010.18123.x SN - 0035-8711 VL - 413 IS - 1 SP - 190 EP - 212 PB - Wiley-Blackwell CY - Hoboken ER - TY - JOUR T1 - Abzug aus Afghanistan, aber nicht kopflos! BT - Positionen des Darmstädter Signals JF - WeltTrends-Papiere KW - Afghanistan KW - Friedens- und Konfliktforschung KW - Internationale Politik KW - Afghanistan KW - Peace and Conflict Studies KW - International Politics Y1 - 2011 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-63260 SN - 1864-0656 IS - 16 SP - 44 EP - 47 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - JOUR A1 - Seifert, Arne C. T1 - Abzug, um zu bleiben BT - Nachdenken in den USA über den strategischen Sieg JF - WeltTrends-Papiere N2 - Inhalt: Plan B für Afghanistan ; Langfriste Kampfmission ; Geostrategie der USA ; Interventionistische Orienterung ; Deutschlands Rolle KW - Afghanistan KW - Friedens- und Konfliktforschung KW - Internationale Politik KW - Afghanistan KW - Peace and Conflict Studies KW - International Politics Y1 - 2011 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-63305 SN - 1864-0656 IS - 16 SP - 63 EP - 67 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - THES A1 - Kellermann, Thorsten T1 - Accurate numerical relativity simulations of non-vacuumspace-times in two dimensions and applications to critical collapse T1 - Exakte numerisch relativistische Simulationen der Nicht-Vakuum-Raum-Zeit in zwei Dimensionen und deren Anwendung zu Problemen des kritischen Kollaps N2 - This Thesis puts its focus on the physics of neutron stars and its description with methods of numerical relativity. In the first step, a new numerical framework the Whisky2D code will be developed, which solves the relativistic equations of hydrodynamics in axisymmetry. Therefore we consider an improved formulation of the conserved form of these equations. The second part will use the new code to investigate the critical behaviour of two colliding neutron stars. Considering the analogy to phase transitions in statistical physics, we will investigate the evolution of the entropy of the neutron stars during the whole process. A better understanding of the evolution of thermodynamical quantities, like the entropy in critical process, should provide deeper understanding of thermodynamics in relativity. More specifically, we have written the Whisky2D code, which solves the general-relativistic hydrodynamics equations in a flux-conservative form and in cylindrical coordinates. This of course brings in 1/r singular terms, where r is the radial cylindrical coordinate, which must be dealt with appropriately. In the above-referenced works, the flux operator is expanded and the 1/r terms, not containing derivatives, are moved to the right-hand-side of the equation (the source term), so that the left hand side assumes a form identical to the one of the three-dimensional (3D) Cartesian formulation. We call this the standard formulation. Another possibility is not to split the flux operator and to redefine the conserved variables, via a multiplication by r. We call this the new formulation. The new equations are solved with the same methods as in the Cartesian case. From a mathematical point of view, one would not expect differences between the two ways of writing the differential operator, but, of course, a difference is present at the numerical level. Our tests show that the new formulation yields results with a global truncation error which is one or more orders of magnitude smaller than those of alternative and commonly used formulations. The second part of the Thesis uses the new code for investigations of critical phenomena in general relativity. In particular, we consider the head-on-collision of two neutron stars in a region of the parameter space where two final states a new stable neutron star or a black hole, lay close to each other. In 1993, Choptuik considered one-parameter families of solutions, S[P], of the Einstein-Klein-Gordon equations for a massless scalar field in spherical symmetry, such that for every P > P⋆, S[P] contains a black hole and for every P < P⋆, S[P] is a solution not containing singularities. He studied numerically the behavior of S[P] as P → P⋆ and found that the critical solution, S[P⋆], is universal, in the sense that it is approached by all nearly-critical solutions regardless of the particular family of initial data considered. All these phenomena have the common property that, as P approaches P⋆, S[P] approaches a universal solution S[P⋆] and that all the physical quantities of S[P] depend only on |P − P⋆|. The first study of critical phenomena concerning the head-on collision of NSs was carried out by Jin and Suen in 2007. In particular, they considered a series of families of equal-mass NSs, modeled with an ideal-gas EOS, boosted towards each other and varied the mass of the stars, their separation, velocity and the polytropic index in the EOS. In this way they could observe a critical phenomenon of type I near the threshold of black-hole formation, with the putative solution being a nonlinearly oscillating star. In a successive work, they performed similar simulations but considering the head-on collision of Gaussian distributions of matter. Also in this case they found the appearance of type-I critical behaviour, but also performed a perturbative analysis of the initial distributions of matter and of the merged object. Because of the considerable difference found in the eigenfrequencies in the two cases, they concluded that the critical solution does not represent a system near equilibrium and in particular not a perturbed Tolmann-Oppenheimer-Volkoff (TOV) solution. In this Thesis we study the dynamics of the head-on collision of two equal-mass NSs using a setup which is as similar as possible to the one considered above. While we confirm that the merged object exhibits a type-I critical behaviour, we also argue against the conclusion that the critical solution cannot be described in terms of equilibrium solution. Indeed, we show that, in analogy with what is found in, the critical solution is effectively a perturbed unstable solution of the TOV equations. Our analysis also considers fine-structure of the scaling relation of type-I critical phenomena and we show that it exhibits oscillations in a similar way to the one studied in the context of scalar-field critical collapse. N2 - Diese Arbeit legt seinen Schwerpunkt auf die Physik von Neutronensternen und deren Beschreibung mit Methoden der numerischen Relativitätstheorie. Im ersten Schritt wird eine neue numerische Umgebung, der Whisky2D Code entwickelt, dieser löst die relativistischen Gleichungen der Hydrodynamik in Axialymmetrie. Hierzu betrachten wir eine verbesserte Formulierung der sog. "flux conserved formulation" der Gleichungen. Im zweiten Teil wird der neue Code verwendet , um das kritische Verhalten zweier kollidierenden Neutronensternen zu untersuchen. In Anbetracht der Analogie, um Übergänge in der statistischen Physik Phase werden wir die Entwicklung der Entropie der Neutronensterne während des gesamten Prozesses betrachten. Ein besseres Verständnis der Evolution von thermodynamischen Größen, wie der Entropie in kritischer Prozess, sollte zu einem tieferen Verständnis der relativistischen Thermodynamik führen. Der Whisky2D Code, zur Lösung Gleichungen relativistischer Hydrodynamik wurde in einer „flux conserved form“ und in zylindrischen Koordinaten geschrieben. Hierdurch entstehen 1 / r singuläre Terme, wobei r der ist, die entsprechend behandelt werden müssen. In früheren Arbeiten, wird der Operator expandiert und die 1 / r spezifisch Therme auf die rechte Seite geschrieben, so dass die linke Seite eine Form annimmt, die identisch ist mit der kartesischen Formulierung. Wir nennen dies die Standard-Formulierung. Eine andere Möglichkeit ist, die Terme nicht zu expandieren, den und den 1/r Term in die Gleichung hinein zu ziehen. Wir nennen dies die Neue-Formulierung. Die neuen Gleichungen werden mit den gleichen Verfahren wie im kartesischen Fall gelöst. Aus mathematischer Sicht ist keine Unterschiede zwischen den beiden Formulierungen zu erwarten, erst die numerische Sicht zeigt die Unterschiede auf. Versuche zeigen, dass die Neue-Formulierung numerische Fehler um mehrere Größenordnungen reduziert. Der zweite Teil der Dissertation verwendet den neuen Code für die Untersuchung kritischer Phänomene in der allgemeinen Relativitätstheorie. Insbesondere betrachten wir die Kopf-auf-Kollision zweier Neutronensterne in einem Bereich des Parameter Raums, deren zwei mögliche Endzustände entweder einen neuen stabilen Neutronenstern oder ein Schwarzes Loch darstellen. Im Jahr 1993, betrachtete Choptuik Ein-Parameter-Familien von Lösungen, S [P], der Einstein-Klein-Gordon-Gleichung für ein masseloses Skalarfeld in sphärischer Symmetrie, so dass für jedes P> P ⋆, S[P] ein Schwarzes Loch enthalten ist und jedes P
14,000 X-ray point sources;> 9800 of them have multiwavelength counterparts. Using Chandra's unsurpassed X-ray spatial resolution, we have separated these point sources from the extensive, spatially-complex diffuse emission that pervades the region; X-ray properties of this diffuse emission suggest that it traces feedback from Carina's massive stars. In this introductory paper, we motivate the survey design, describe the Chandra observations, and present some simple results, providing a foundation for the 15 papers that follow in this special issue and that present detailed catalogs, methods, and science results. KW - H II regions KW - stars: massive KW - stars: pre-main sequence KW - X-rays: individual (Carina) KW - X-rays: ISM KW - X-rays: stars Y1 - 2011 U6 - https://doi.org/10.1088/0067-0049/194/1/1 SN - 0067-0049 VL - 194 IS - 1 PB - IOP Publ. Ltd. CY - Bristol ER - TY - JOUR A1 - Lincke, Jens A1 - Appeltauer, Malte A1 - Steinert, Bastian A1 - Hirschfeld, Robert T1 - An open implementation for context-oriented layer composition in ContextJS JF - Science of computer programming N2 - Context-oriented programming (COP) provides dedicated support for defining and composing variations to a basic program behavior. A variation, which is defined within a layer, can be de-/activated for the dynamic extent of a code block. While this mechanism allows for control flow-specific scoping, expressing behavior adaptations can demand alternative scopes. For instance, adaptations can depend on dynamic object structure rather than control flow. We present scenarios for behavior adaptation and identify the need for new scoping mechanisms. The increasing number of scoping mechanisms calls for new language abstractions representing them. We suggest to open the implementation of scoping mechanisms so that developers can extend the COP language core according to their specific needs. Our open implementation moves layer composition into objects to be affected and with that closer to the method dispatch to be changed. We discuss the implementation of established COP scoping mechanisms using our approach and present new scoping mechanisms developed for our enhancements to Lively Kernel. KW - ContextJS KW - Context-oriented programming KW - Open implementations KW - Dynamic adaptation KW - Scope Y1 - 2011 U6 - https://doi.org/10.1016/j.scico.2010.11.013 SN - 0167-6423 VL - 76 IS - 12 SP - 1194 EP - 1209 PB - Elsevier CY - Amsterdam ER - TY - JOUR A1 - Winck, Flavia Vischi A1 - Kwasniewski, Miroslaw A1 - Wienkoop, Stefanie A1 - Müller-Röber, Bernd T1 - An optimized method for the isolation of nuclei from chlamydomas Reinhardtii (Chlorophyceae) JF - Journal of phycology N2 - The cell nucleus harbors a large number of proteins involved in transcription, RNA processing, chromatin remodeling, nuclear signaling, and ribosome assembly. The nuclear genome of the model alga Chlamydomonas reinhardtii P. A. Dang. was recently sequenced, and many genes encoding nuclear proteins, including transcription factors and transcription regulators, have been identified through computational discovery tools. However, elucidating the specific biological roles of nuclear proteins will require support from biochemical and proteomics data. Cellular preparations with enriched nuclei are important to assist in such analyses. Here, we describe a simple protocol for the isolation of nuclei from Chlamydomonas, based on a commercially available kit. The modifications done in the original protocol mainly include alterations of the differential centrifugation parameters and detergent-based cell lysis. The nuclei-enriched fractions obtained with the optimized protocol show low contamination with mitochondrial and plastid proteins. The protocol can be concluded within only 3 h, and the proteins extracted can be used for gel-based and non-gel-based proteomic approaches. KW - 2D gel electrophoresis KW - algae KW - Chlamydomonas KW - nuclear proteins KW - nucleus KW - proteomics Y1 - 2011 U6 - https://doi.org/10.1111/j.1529-8817.2011.00967.x SN - 0022-3646 VL - 47 IS - 2 SP - 333 EP - 340 PB - Wiley-Blackwell CY - Malden ER - TY - THES A1 - Fettke, Jörg T1 - Analysen Stärke-bezogener Kohlenstoffflüsse Y1 - 2011 CY - Potsdam ER - TY - JOUR A1 - Zakharova, Anna A1 - Kurths, Jürgen A1 - Vadivasova, Tatyana A1 - Koseska, Aneta T1 - Analysing dynamical behavior of cellular networks via stochastic bifurcations JF - PLoS one N2 - The dynamical structure of genetic networks determines the occurrence of various biological mechanisms, such as cellular differentiation. However, the question of how cellular diversity evolves in relation to the inherent stochasticity and intercellular communication remains still to be understood. Here, we define a concept of stochastic bifurcations suitable to investigate the dynamical structure of genetic networks, and show that under stochastic influence, the expression of given proteins of interest is defined via the probability distribution of the phase variable, representing one of the genes constituting the system. Moreover, we show that under changing stochastic conditions, the probabilities of expressing certain concentration values are different, leading to different functionality of the cells, and thus to differentiation of the cells in the various types. Y1 - 2011 U6 - https://doi.org/10.1371/journal.pone.0019696 SN - 1932-6203 VL - 6 IS - 5 PB - PLoS CY - San Fransisco ER - TY - JOUR A1 - Samereier, Matthias A1 - Baumann, Otto A1 - Meyer, Irene A1 - Gräf, Ralph T1 - Analysis of dictyostelium TACC reveals differential interactions with CP224 and unusual dynamics of dictyostelium microtubules JF - Cellular and molecular life sciences N2 - We have localized TACC to the microtubule-nucleating centrosomal corona and to microtubule plus ends. Using RNAi we proved that Dictyostelium TACC promotes microtubule growth during interphase and mitosis. For the first time we show in vivo that both TACC and XMAP215 family proteins can be differentially localized to microtubule plus ends during interphase and mitosis and that TACC is mainly required for recruitment of an XMAP215-family protein to interphase microtubule plus ends but not for recruitment to centrosomes and kinetochores. Moreover, we have now a marker to study dynamics and behavior of microtubule plus ends in living Dictyostelium cells. In a combination of live cell imaging of microtubule plus ends and fluorescence recovery after photobleaching (FRAP) experiments of GFP-alpha-tubulin cells we show that Dictyostelium microtubules are dynamic only in the cell periphery, while they remain stable at the centrosome, which also appears to harbor a dynamic pool of tubulin dimers. KW - Dictyostelium KW - TACC KW - DdCP224 KW - XMAP215 KW - Microtubules KW - Centrosome Y1 - 2011 U6 - https://doi.org/10.1007/s00018-010-0453-0 SN - 1420-682X VL - 68 IS - 2 SP - 275 EP - 287 PB - Springer CY - Basel ER - TY - JOUR A1 - Schulz, Michael Karl T1 - Andrzej Trzciński, Hebrajskie inskrypcje na materiale kamiennym w Polsce w XIII-XX wieku : Studium paleograficzno-epigraficzne [Hebräische Inschriften auf Steinmaterial in Polen im 13.-19. Jahrhundert : Ein paläographisch-epigraphisches Studium] / [rezensiert von] Michał Szulc JF - PaRDeS : Zeitschrift der Vereinigung für Jüdische Studien e.V. N2 - rezensiertes Werk: Trzciński, Andrzej: Hebrajskie inskrypcje na materiale kamiennym w Polsce w XIII-XX wieku : Studium paleograficzno-epigraficzne. - Lublin : Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej, 2007. - 398 S. ISBN 978-83-227-2631-0 Y1 - 2011 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-53452 SN - 1614-6492 SN - 1862-7684 IS - 17 SP - 255 EP - 257 ER - TY - THES A1 - Hass, Roland T1 - Angewandte Photonendichtewellen Spektroskopie Y1 - 2011 CY - Potsdam ER - TY - GEN A1 - Franselow, Gisbert A1 - Schlesewsky, Matthias A1 - Vogel, Ralf A1 - Weskott, Thomas T1 - Animacy effects on crossing wh-movement in German N2 - This article presents several acceptability rating experiments concerned with crossing wh-movement in German multiple questions. Our results show that there is no general superiority effect in German, thus refuting claims to the contrary by Featherston (2005). However, acceptability is reduced when a whphrase crosses a wh-subject with which it agrees in animacy. We explain this finding in terms of the availability of different sorting keys for the answers to the multiple questions. T3 - Zweitveröffentlichungen der Universität Potsdam : Humanwissenschaftliche Reihe - 299 Y1 - 2011 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-93630 SP - 657 EP - 683 ER - TY - JOUR A1 - Fanselow, Gisbert A1 - Schlesewsky, Matthias A1 - Vogel, Ralf A1 - Weskott, Thomas T1 - Animacy effects on crossing wh-movement in German JF - Linguistics : an interdisciplinary journal of the language sciences N2 - This article presents several acceptability rating experiments concerned with crossing wh-movement in German multiple questions. Our results show that there is no general superiority effect in German, thus refuting claims to the contrary by Featherston (2005). However, acceptability is reduced when a wh-phrase crosses a wh-subject with which it agrees in animacy. We explain this finding in terms of the availability of different sorting keys for the answers to the multiple questions. Y1 - 2011 U6 - https://doi.org/10.1515/LING.2011.021 SN - 0024-3949 VL - 49 IS - 4 SP - 657 EP - 683 PB - De Gruyter Mouton CY - Berlin ER - TY - THES A1 - Bögel, Simon T1 - Anreize bei der Budgetierung : Welche dysfunktionalen Verhaltensweisen der Manager resultieren aus der Berliner Median-Budgetierung? T1 - Incentives in the budgeting process : Which dysfunctional behaviors of managers result from the Berlin median-budgeting process? N2 - Die vorliegende Arbeit untersucht das Zusammenspiel von Motiven und Anreizen sowie beobachtbaren dysfunktionalen Verhaltensweisen von Managern bei der Berliner Median-Budgetierung. Von einer Literaturrecherche ausgehend wird zunächst das theoretische Konzept der Dysfunktionen näher gehend erläutert und erklärt. Um den Aussagegehalt der theoretischen Annahmen zu überprüfen und somit eine Verbindung zwischen Einzelfallstudie und generellem theoretischem Kontext zu erhalten, werden hierzu Hypothesen aufgestellt. Darauf aufbauend folgt eine Einzelfallstudie der Berliner Median-Budgetierung mit Fokus auf die Amtsleiter der Leistungs- und Verantwortungszentren. Auf der fallbezogenen Ebene zeigt sich, dass die ursprünglich in der Berliner Median-Budgetierung intendierten Anreizfunktionen bei den Amtsleitern weitest gehend nicht verfangen. Vielmehr produziert das Verfahren Anreize, die dysfunktionale Verhaltensweisen fördern. Auf der generellen Ebene kann hierzu ein Zusammenhang zwischen theoretischen Annahmen zu Dysfunktionen und den Beobachtungen der Einzelfallstudie hergestellt werden. Somit lassen sich dysfunktionale Handlungsmuster innerhalb der Berliner Median-Budgetierung mittels Erklärungsmodellen der theoretischen Konzeption begründen. N2 - This thesis analyzes the interaction of motives and incentives and observable dysfunctional behavior of managers at the Berlin median-budgeting system. First, the thesis explains the theoretical concept of dysfunctions, as explained in the literature. Hypotheses are established to verify the significance of the theoretical assumptions, thus establishing a connection between the case-study with the general theoretical context. Thereon a single case-study of the Berlin median-budgeting system follows. The research results show that the intended incentive-functions in the Berlin median- budgeting system do not affect the head officials. The procedure rather supports dysfunctional behavior. A connection can be drawn between the results of the case study and the general theoretical assumptions. Therefore, dysfunctional behavior at the local level of the Berlin median-budgeting system can be explained with the help of explanatory models of the theoretical concept. T3 - Schriftenreihe für Public und Nonprofit Management - 13 KW - Anreize KW - Budgetierung KW - Dysfunktionen KW - Berlin KW - Verhalten KW - Incentives KW - Budget KW - Dysfunction KW - Berlin KW - Behavior Y1 - 2011 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-58124 ER - TY - JOUR A1 - Faber, Eike T1 - Anti-Germanism in Constantinople or the Revolt of Gainas? JF - New perspectives on late antiquity Y1 - 2011 SN - 978-1-4438-2718-8 SN - 978-1-4438-2809-3 SP - 124 EP - 135 PB - Cambridge Scholars CY - Newcastle upon Tyne ER - TY - JOUR A1 - Mengibar, M. A1 - Ganan, M. A1 - Miralles, B. A1 - Carrascosa, A. V. A1 - Martinez-Rodriguez, Adolfo J. A1 - Peter, Martin G. A1 - Heras, A. T1 - Antibacterial activity of products of depolymerization of chitosans with lysozyme and chitosanase against Campylobacter jejuni JF - Carbohydrate polymers : an international journal devoted to scientific and technological aspects of industrially important polysaccharides N2 - Chitosan has several biological properties useful for the food industry, but the most attractive is its potential use as a food preservative of natural origin due to its antimicrobial activity against a wide range of food-borne microorganisms. Among food-borne pathogens, Campylobacter jejuni and related species are recognised as the most common causes of bacterial food-borne diarrhoeal disease throughout the world. Recently, it has been demonstrated that campylobacters are highly sensitive to chitosan. Even though chitosan is known to have important functional activities, poor solubility makes them difficult to use in food and biomedical applications. Unlike chitosan, the low viscosity and good solubility of chitosan oligosaccharides (COS) make them especially attractive in an important number of useful applications. In the present work, the effect of different COS on C. jejuni was investigated. Variables such as the physicochemical characteristics of chitosan and the enzyme used in COS preparation were studied. The COS had been fractioned using ultrafiltration membranes and each fraction was characterized regarding its FA and molecular weight distribution. It has been demonstrated that the biological properties of COS on Campylobacter depend on the composition of the fraction analysed. COS prepared by enzymatic hydrolysis with chitosanase were more active against Campylobacter that lysozyme-derived COS, and this behaviour seems to be related with the acetylation of the chains. On the other hand. the 10-30 kDa fraction was the most active COS fraction, independently of the enzyme used for the hydrolysis. These results have shown that COS could be useful as antimicrobial in the control of C. jejuni. KW - Campylobacter jejuni KW - Chitooligosaccharides KW - Chitosanase KW - Lysozyme KW - Depolymerization Y1 - 2011 U6 - https://doi.org/10.1016/j.carbpol.2010.04.042 SN - 0144-8617 VL - 84 IS - 2 SP - 844 EP - 848 PB - Elsevier CY - Oxford ER - TY - JOUR A1 - Bonaventura, Klaus A1 - Sonntag, Steffen A1 - Kleber, Franz X. T1 - Antiplatelet therapy in the era of percutaneous coronary intervention with drug-eluting balloons JF - EuroIntervention : official journal of EuroPCR and the European Association of Percutaneous Cardiovascular Interventions (EAPCI) N2 - The high rate of restenosis associated with percutaneous coronary intervention (PCI) procedures can be reduced with the implantation of metallic stents into the stenotic vessels. The knowledge that neointimal formation can result in restenosis after stent implantation led to the development of drug-eluting stents (DES) which require long lasting antiplatelet therapy to avoid thrombotic complications. In the last years, the drug-eluting balloon (DEB) technology has emerged as an alternative option for the treatment of coronary and peripheral arteries. Clinical studies demonstrated the safety and effectiveness of DEB in various clinical scenarios and support the use of paclitaxel-eluting balloons for the treatment of in-stent restenosis, of small coronary arteries and bifurcations lesions. The protocols of DEB studies suggest that the dual antiplatelet therapy with aspirin and clopidogrel of four weeks after DEB is safe and effective. KW - drug-eluting balloon KW - clopidogrel KW - drug-eluting stent KW - coronary artery disease Y1 - 2011 SN - 1774-024X VL - 7 IS - 2 SP - K106 EP - K111 PB - Universitätsverlag Potsdam CY - Toulouse ER - TY - THES A1 - Richter, Michael T1 - Anwendung nichtlinearer Codes zur Fehlererkennung und -korrektur Y1 - 2011 CY - Potsdam ER -