Browsing Naturwissenschaften, Mathematik und Informatik by Title
Now showing items 4632-4651 of 5802
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Stimulus-secretion coupling in pancreatic β-cells of healthy and diabetic rats in tissue slice preparation
(2006-07-04)A primary event in the development of type 2 diabetes is a decrease in the capacity of pancreatic β-cells to secrete insulin in response to glucose stimulation. The Goto Kakizaki (GK) ... -
Stochastic (thermo)dynamics of molecular coupled processes
(2024-12-18)Out of equilibrium biological processes are the key for life. From large animals to the smallest proteins, life is sustained by a continuous throughput of free energy. This happens through the exchange of some form of ... -
Stochastic dynamics of driven Brownian particles in viscoelastic solvents
(2025-01-13)Since its seminal discovery by the botanist Robert Brown, Brownian motion has become an important paradigm in statistical physics. It describes the incessant, random motion of small (Brownian) particles suspended in a ... -
Stochastic field theory of viscoelastic solids: a quantitative study of phononic friction
(2022-07-27)Identifying the relevant dynamics of solids that give rise to friction is an active field of study. It includes electronic and phononic degrees of freedom, but the latter seems to be of particular significance. For instance, ... -
Stochastic Models in Population Genetics: The Impact of Selection and Recombination
(2015-03-27)We consider gene genealogies from populations under selective pressure and take into account that genes can be reassembled during the reproduction process due to recombination. The main result is the derivation of an ... -
Stoichiometric Biology of the Synapse
(2013-05-07)Synaptic transmission at chemical synapses relies on the fusion of neurotransmitter-loaded vesicles with the plasma membrane of the pre-synaptic terminal (exocytosis). The synaptic vesicle material is then retrieved from ... -
Stone deterioration and replacement of natural building stones at the Cologne cathedral - A contribution to the preservation of cultural heritage
(2013-11-21)The present work deals with the deterioration of natural building stones as a function of mineralogical and petrophysical properties in different environmental and building-physical contexts. Taking Cologne cathedral as ... -
Stoßinduzierte Strömungsablösung in transitionellen Grenzschichten
(2022-01-21)The effects of transitional shock-wave/boundary-layer interactions (SWBLI) on the induced heat loads and the development of the laminar-turbulent transition are the subject of this work. Experimental investigations were ... -
Stoßwellenuntersuchungen und Modellierung der Pyrolyse von Pentafluorethan und 2-H-Heptafluorpropan
(2014-02-20)The pyrolysis of C2HF5 and C3HF7 have been studied in shock waves by monitoring die UV-absorption of CF2 at 248nm and temperatures in the range of 1400 - 2000 K. Ar was used as bath gas with concentrations in the range ... -
Stoßwellenuntersuchungen zur Kinetik und Druckabhängigkeit der Wasserstoffperoxidpyrolyse mittels Laser-Absorptions-Spektroskopie
(2002-07-02)The thermal decomposition of hydrogen peroxide and its secondary reactions was investigated in shock wave studies over a temperature range relevant for combustion. Based on a mode locked Titanium:sapphire laser a new laser ... -
Strategien zur Verbesserung der N-Ausnutzung im ökologisch wirtschaftenden Futterbaubetrieb
(2012-12-18)Organic forage and mixed farms often do not utilize their grassland to its full potential. In mixed farms this affects the arable farming as well. By intensifying grassland production (more clover, more cuts), N leaching ... -
Strategies of Sexual Reproduction in Aphids
(2002-11-08)Second copulas of Uroleucon cirsii (L.) are shorter on average than first copulas both for individual males and females. This suggests that male aphids are limited by sperm, on the one hand, ... -
Strategische Gruppen in der deutschen Brauwirtschaft
(2006-07-17)The prevailing existence of differences in corporate success between companies of a certain industrial sector can be explained by the concept of strategic groups. This study applies the ... -
Strategische Unternehmensführung landwirtschaftlicher Haupterwerbsbetriebe: Eine Untersuchung am Beispiel Nordrhein-Westfalens
(2007-04-23)The European agrofood sector is more and more confronted with the threats as well as opportunities of liberalizing markets. Therefore, competitiveness on global markets is becoming paramount ... -
Strength grading and selected strength properties of European hardwoods
(2019-07-22)Since national standing stocks of hardwoods will be rising in central Europe in the future, it is the declared political will to introduce these resources to a higher extent into the building sector. That is why since the ... -
Strengths and Difficulties Questionnaire (SDQ)
(2008-02-12)This study examines whether the German translation of the Strengths and Difficulties Questionnaire (SDQ) is a reliable and valid screening instrument and whether it is as effective a tool for clinical diagnostics and ... -
Stress Response SCF Ubiquitin Ligase F box Protein Fbx15 Controls Nuclear Co repressor Localization and Virulence of the Opportunistic Human Fungal Pathogen Aspergillus fumigatus
(2016-09-06)Aspergillus fumigatus is the most prevalent cause for pulmonary infections in immuno-compromised patients. Virulence factors are often linked to developmental control mechanisms, which are often identified in the closely ... -
Streuexperimente mit Wasserstoff- und Heliumstrahlen zur Untersuchung der Wechselwirkung von H2, N2 und C2H2 mit den (001)-Oberflächen von LiF, NaCl, KCl und MgO
(2001-09-24)In the present work the interaction of hydrogen, nitrogen and acetylene with the surfaces of ionic crystals has been investigated. These studies use the scattering of molecular hydrogen beams from clean surfaces as well ... -
Strong magnetic fields and unusual flows in sunspots
(2023-02-06)This thesis presents a study of sunspots, which are the most prominent features observed on the solar surface. Their structure is governed by the magnetic field. The umbra and penumbra of sunspots harbor different strengths ...