Laudatio

Der vorliegende Band dokumentiert die Reden, die während der akademischen Feier anlässlich der Verleihung der Würde eines Dr. theol. honoris causa an Prof. Dr. Helmut Greve am 19. November 2007 in der Universität Hamburg gehalten wurden.This volume documents the speeches that were given during the academic celebration on the occasion of the award of the dignity of Dr. theol. honoris causa to Prof. Dr. Helmut Greve at the University of Hamburg on November 19, 2007

Ueber das zellwandlösende Enzym der Gerste

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ICS Bulletin, Number 4, 2015

Der vorliegende Band dokumentiert die Reden, die während der akademischen Feier anlässlich der Verleihung der Würde eines Dr. theol. honoris causa an Prof. Dr. Helmut Greve am 19. November 2007 in der Universität Hamburg gehalten wurden.This volume documents the speeches that were given during the academic celebration on the occasion of the award of the dignity of Dr. theol. honoris causa to Prof. Dr. Helmut Greve at the University of Hamburg on November 19, 2007

Time-Resolved Soft X-ray Diffraction Reveals Transient Structural Distortions of Ternary Liquid Crystals

Home-based soft X-ray time-resolved scattering experiments with nanosecond time resolution (10 ns) and nanometer spatial resolution were carried out at a table top soft X-ray plasma source (2.2–5.2 nm). The investigated system was the lyotropic liquid crystal C16E7/paraffin/glycerol/formamide/IR 5. Usually, major changes in physical, chemical, and/or optical properties of the sample occur as a result of structural changes and shrinking morphology. Here, these effects occur as a consequence of the energy absorption in the sample upon optical laser excitation in the IR regime. The liquid crystal shows changes in the structural response within few hundred nanoseconds showing a time decay of 182 ns. A decrease of the Bragg peak diffracted intensity of 30% and a coherent macroscopic movement of the Bragg reflection are found as a response to the optical pump. The Bragg reflection movement is established to be isotropic and diffusion controlled (1 μs). Structural processes are analyzed in the Patterson analysis framework of the time-varying diffraction peaks revealing that the inter-lamellar distance increases by 2.7 Å resulting in an elongation of the coherently expanding lamella crystallite. The present studies emphasize the possibility of applying TR-SXRD techniques for studying the mechanical dynamics of nanosystems

The Influence of Disorder on Thermotropic Nematic Liquid Crystals Phase Behavior

We review the theoretical research on the influence of disorder on structure and phase behavior of condensed matter system exhibiting continuous symmetry breaking focusing on liquid crystal phase transitions. We discuss the main properties of liquid crystals as adequate systems in which several open questions with respect to the impact of disorder on universal phase and structural behavior could be explored. Main advantages of liquid crystalline materials and different experimental realizations of random field-type disorder imposed on liquid crystal phases are described

Universitätsbibliothek der Veterinärmedizinischen Universität Wien

Short presentation of the Library of the University of Veterinary Medicine Vienn