Time filter

Source Type

Rostock, Germany

The University of Rostock is a public university located in Rostock, Mecklenburg-Vorpommern, Germany. Founded in 1419, it is the third-oldest university in Germany. It is the oldest and largest university in continental northern Europe and the Baltic Sea area, and 8th oldest in Central Europe. It was the 5th university established in the Holy Roman Empire. The university has been associated with five Nobel laureates. Famous alumni include Nobel laureates: Albrecht Kossel, Karl von Frisch, and Otto Stern; theoretical physicists: Pascual Jordan and Walter H. Schottky. It is a member of the European University Association. The language of instruction is usually German, but Englishfor postgraduate studies. Wikipedia.

Gassmann A.,University of Rostock
Quarterly Journal of the Royal Meteorological Society | Year: 2013

This study describes a new global non-hydrostatic dynamical core (ICON-IAP: Icosahedral Nonhydrostatic model at the Institute for Atmospheric Physics) on a hexagonal C-grid which is designed to conserve mass and energy. Energy conservation is achieved by discretizing the antisymmetric Poisson bracket which mimics correct energy conversions between the different kinds of energy (kinetic, potential, internal). Because of the bracket structure this is even possible in a complicated numerical environment with (i) the occurrence of terrain-following coordinates with all the metric terms in it, (ii) the horizontal C-grid staggering on the Voronoi mesh and the complications induced by the need for an acceptable stationary geostrophic mode, and (iii) the necessity for avoiding Hollingsworth instability. The model is equipped with a Smagorinsky-type nonlinear horizontal diffusion. The associated dissipative heating is accounted for by the application of the discrete product rule for derivatives. The time integration scheme is explicit in the horizontal and implicit in the vertical. In order to ensure energy conservation, the Exner pressure has to be off-centred in the vertical velocity equation and extrapolated in the horizontal velocity equation. Test simulations are performed for small-scale and global-scale flows. A test simulation of linear non-hydrostatic flow over a rough mountain range shows the theoretically expected gravity wave propagation. The baroclinic wave test is extended to 40 days in order to check the Lorenz energy cycle. The model exhibits excellent energy conservation properties even in this strongly nonlinear and dissipative case. The Held-Suarez test confirms the reliability of the model over even longer time-scales. © 2012 Royal Meteorological Society. Source

Gupta K.J.,University of Rostock
Science signaling | Year: 2011

The highly diffusible free radical nitric oxide (NO) has emerged as a key signaling molecule in bacteria, plants, and animals. There are several mechanisms through which NO is produced in plants, and once produced, NO readily reacts with various targets, such as thiols and the metallic centers of proteins. During the past few years, S-nitrosylation, the covalent and reversible binding of NO to the thiols of reduced reactive cysteine residues, has emerged as an important posttranslational modification. S-nitrosylation is thought to account for much of the widespread influence of NO on cellular signaling through redox-based biochemical regulation of signaling components. Here, I highlight the emerging roles of S-nitrosylation in plants with particular emphasis on the role of S-nitrosylation in mitochondria during the defense response. Source

Nienaber C.A.,University of Rostock | Clough R.E.,Kings College London
The Lancet | Year: 2015

A new appraisal of the management of acute aortic dissection is timely because of recent developments in diagnostic strategies (including biomarkers and imaging), endograft design, and surgical treatment, which have led to a better understanding of the epidemiology, risk factors, and molecular nature of aortic dissection. Although open surgery is the main treatment for proximal aortic repair, use of endovascular management is now established for complicated distal dissection and distal arch repair, and has recently been discussed as a pre-emptive measure to avoid late complications by inducing aortic remodelling. © 2015 Elsevier Ltd. Source

Lutke-Eversloh T.,University of Rostock
Applied Microbiology and Biotechnology | Year: 2014

The renewed interests in clostridial acetone-butanol-ethanol (ABE) fermentation as a next-generation biofuel source led to significantly intensified research in the past few years. This mini-review focuses on the current status of metabolic engineering techniques available for the model organism of ABE fermentation, Clostridium acetobutylicum. A comprehensive survey of various application examples covers two general issues related to both basic and applied research questions: (i) how to improve biofuel production and (ii) what information can be deduced from respective genotype/phenotype manipulations. Recently developed strategies to engineer C. acetobutylicum are summarized including the current portfolio of altered gene expression methodologies, as well as systematic (rational) and explorative (combinatorial) metabolic engineering approaches. © 2014 Springer-Verlag. Source

Popok V.N.,University of Rostock
Materials Science and Engineering R: Reports | Year: 2011

Atomic and molecular clusters can be considered to be a distinct form of matter, a "bridge" between atoms on the one hand and solids on the other. Interest in clusters comes from various fields. They can be used as models for investigation of fundamental physical aspects of the transition from the atomic scale to bulk material as well as controllable and versatile tools for modification and processing of surfaces and shallow layers on the nanometer scale. One of the important parameters in the application of cluster beams is the impact (or kinetic) energy. Current paper presents a state-of-the-art review in the field of cluster-surface interaction. The main emphasis is put on cluster collisions leading either to surface modification or implantation of cluster constituents. Both experimental results and data of theoretical modeling are considered. In particular, fundamental physical aspects and possible practical applications of pinning regime (slight cluster embedding into the surface) are under the discussion. Mechanisms of crater and hillock formation on the individual cluster impacts as well as of surface erosion on macroscopic scale (smoothing or dry etching) under the high fluence cluster bombardment are analysed. Specific phenomena of cluster stopping in matter and formation of radiation damage under keV-to-MeV energy implantation are critically analysed and an approach towards finding a universal scaling law for the cluster implantation is suggested. A number of advantages peculiar to the cluster beam technique are discussed in terms of designing and engineering the physical and chemical properties of materials for practical applications. © 2011 Elsevier B.V. Source

Discover hidden collaborations