Seminars of the Focus Area Complex Systems

Prof. Dr. C. Beta, Prof. Dr. K. Dethloff, Prof. Dr. R. Engbert, Prof. Dr. M. Holschneider, Prof. Dr. W. Huisinga, Prof. Dr. Ralf Metzler, Prof. Dr. A. Pikovsky, Prof. Dr. S. Reich, Prof. Dr. M. Rosenblum, Prof. Dr. G. Rüdiger, Prof. Dr. T. Scheffer, Prof. Dr. F. Scherbaum, Prof. Dr. J. Selbig, Prof. Dr. F. Spahn

Seminar

Speaker: Michael Stich, Aston University, Birmingham, UK

Title: Chemical and chiral oscillations in simple polymerization models * Joint Event: Colloquium on Complex and Biological Systems / Seminar of the GRK 1558

Time: Fri, Nov 22, 2013, 10:15am

Place: bldg 28, room 0.108

Abstract:
Some fundamental building blocks of living matter, such as amino acids and sugars show the preference of one of the two chiral states of an otherwise chemically identical molecule. The origin of this so-called biological homochirality is still a matter of debate, even after decades of intense theoretical and experimental work. At the heart of many theoretical approaches lies a mechanism responsible for spontaneous mirror symmetry breaking, leading finally to stable stationary states of given chirality, i.e., states with nonvanishing enantiomeric excess. In this talk, we discuss a model purporting to describe general chiral polymerization processes in a prebiotically relevant system, devised for explaining the appearance of homochirality. We observe the onset of stable chemical oscillations in this model which are in fact related to the appearance of oscillations in the enantiomeric excess, the so-called chiral oscillations. We discuss the importance of the results in light of recent experiments on amino acids reporting chiral oscillations and the fact that the memory of the sign of an initial primordial chiral fluctuation could be erased by subsequent oscillations.

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Past NLD Seminars (1994-2007) & (2008 ...)

Students' seminar: Theoretical Physics, PIK, Modeling & TSA Berlin-Potsdam-Colloquia: PhysGesellschaft Berlin, TU Berlin, Pro Physik, AIP, AEI, MPI-KGF, GFZ, HMI, PIK, AWI, Max Planck Institute for the History of Science, Mathematik, DPG Disputationen, & Vorschau UP

Udo Schwarz, Zentrum für Dynamik komplexer Systeme,
Universität Potsdam, Campus Golm Karl-Liebknecht-Str. 24, 14476 Potsdam, building 28, room 2.107
Phone: (+49-331) 977-1658, Fax : (+49-331) 977-1045

Email: Udo.Schwarz AT uni-potsdam.de

DFG SFB 1294

DFG Sonderforschungsbereich 1294 Data assimilation

DFG SPP 1488

DFG Schwerpunktprogramm 1488 Planetmag


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