@phdthesis{Zhang2011, author = {Zhang, Zhuodong}, title = {A regional scale study of wind erosion in the Xilingele grassland based on computational fluid dynamics}, address = {Potsdam}, pages = {143 S.}, year = {2011}, language = {en} } @misc{ArnoldNikoloski2011, author = {Arnold, Anne and Nikoloski, Zoran}, title = {A quantitative comparison of Calvin-Benson cycle models}, series = {Trends in plant science}, volume = {16}, journal = {Trends in plant science}, number = {12}, publisher = {Elsevier}, address = {London}, issn = {1360-1385}, doi = {10.1016/j.tplants.2011.09.004}, pages = {676 -- 683}, year = {2011}, abstract = {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.}, language = {en} } @article{HelfertWarschburger2011, author = {Helfert, Susanne and Warschburger, Petra}, title = {A prospective study on the impact of peer and parental pressure on body dissatisfaction in adolescent girls and boys}, series = {Body image : an international journal of research}, volume = {8}, journal = {Body image : an international journal of research}, number = {2}, publisher = {Elsevier}, address = {Amsterdam}, issn = {1740-1445}, doi = {10.1016/j.bodyim.2011.01.004}, pages = {101 -- 109}, year = {2011}, abstract = {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.}, language = {en} } @article{NeumannNoeskeBachetal.2011, author = {Neumann, Mike and Noeske, Robert and Bach, Grete and Glaubauf, Thomas and Bartoszek, Michael and Strauch, Peter}, title = {A procedure for rapid determination of the silicon content in plant materials}, series = {Zeitschrift f{\"u}r Naturforschung : B, Chemical sciences}, volume = {66}, journal = {Zeitschrift f{\"u}r Naturforschung : B, Chemical sciences}, number = {3}, publisher = {De Gruyter}, address = {T{\"u}bingen}, issn = {0932-0776}, pages = {289 -- 294}, year = {2011}, abstract = {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.}, language = {en} } @article{LiaimerJenkeKodamaIshidaetal.2011, author = {Liaimer, Anton and Jenke-Kodama, Holger and Ishida, Keishi and Hinrichs, Katrin and Stangeland, Janne and Hertweck, Christian and Dittmann-Th{\"u}nemann, Elke}, title = {A polyketide interferes with cellular differentiation in the symbiotic cyanobacterium Nostoc punctiforme}, series = {Environmental microbiology reports}, volume = {3}, journal = {Environmental microbiology reports}, number = {5}, publisher = {Wiley-Blackwell}, address = {Malden}, issn = {1758-2229}, doi = {10.1111/j.1758-2229.2011.00258.x}, pages = {550 -- 558}, year = {2011}, abstract = {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.}, language = {en} } @article{MannYoungFuuentesSchuller2011, author = {Mann, R. B. and Young, M. B. and Fu{\"u}ntes-Schuller, I.}, title = {A perturbative approach to inelastic collisions in a Bose-Einstein condensate}, series = {Journal of physics : B, Atomic, molecular and optical physics}, volume = {44}, journal = {Journal of physics : B, Atomic, molecular and optical physics}, number = {8}, publisher = {IOP Publ. Ltd.}, address = {Bristol}, issn = {0953-4075}, doi = {10.1088/0953-4075/44/8/085301}, pages = {17}, year = {2011}, abstract = {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.}, language = {en} } @article{StahlbergLahmann2011, author = {Stahlberg, Tim and Lahmann, Henning}, title = {A Paradigm of Prevention Humpty Dumpty, the War on Terror, and the Power of Preventive Detention in the United States, Israel, and Europe}, series = {The American journal of comparative law}, volume = {59}, journal = {The American journal of comparative law}, number = {4}, publisher = {American Society of Comparative Law}, address = {Berkeley}, issn = {0002-919X}, doi = {10.5131/AJCL.2010.0034}, pages = {1051 -- 1087}, year = {2011}, abstract = {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."}, language = {en} } @article{WessigWawrzinekMoellnitzetal.2011, author = {Wessig, Pablo and Wawrzinek, Robert and Moellnitz, Kristian and Feldbusch, Elvira and Schilde, Uwe}, title = {A new class of fluorescent dyes based on 1,3-benzodioxole and [1,3]-dioxolo[4.5-f]benzodioxole}, series = {Tetrahedron letters}, volume = {52}, journal = {Tetrahedron letters}, number = {46}, publisher = {Elsevier}, address = {Oxford}, issn = {0040-4039}, doi = {10.1016/j.tetlet.2011.09.058}, pages = {6192 -- 6195}, year = {2011}, abstract = {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.}, language = {en} } @article{BelovaShchukinGorinetal.2011, author = {Belova, Valentina and Shchukin, Dmitry G. and Gorin, Dmitry A. and Kopyshev, Alexey and Moehwald, Helmuth}, title = {A new approach to nucleation of cavitation bubbles at chemically modified surfaces}, series = {Physical chemistry, chemical physics : a journal of European Chemical Societies}, volume = {13}, journal = {Physical chemistry, chemical physics : a journal of European Chemical Societies}, number = {17}, publisher = {Royal Society of Chemistry}, address = {Cambridge}, issn = {1463-9076}, doi = {10.1039/c1cp20218a}, pages = {8015 -- 8023}, year = {2011}, abstract = {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.}, language = {en} } @article{ShinZoellerHolschneideretal.2011, author = {Shin, Seoleun and Z{\"o}ller, Gert and Holschneider, Matthias and Reich, Sebastian}, title = {A multigrid solver for modeling complex interseismic stress fields}, series = {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}, volume = {37}, journal = {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}, number = {8}, publisher = {Elsevier}, address = {Oxford}, issn = {0098-3004}, doi = {10.1016/j.cageo.2010.11.011}, pages = {1075 -- 1082}, year = {2011}, abstract = {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.}, language = {en} }