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: Symmetry breaking in simple models of cooperative polymerization * Colloquium on Complex and Biological Systems * Joint Event with GRK 1558 and BCSCCS

Time: Fri, Jun 2, 2017, 10:15am

Place: bldg 28, room 0.108

Abstract:
Biological homochirality is the well-established preference of biomolecules for only one of two chiral isomers (or enantiomers), as for example observed in sugars (D enantiomer) and amino acids (Lenantiomer). Understanding how this symmetry breaking may have emerged remains a challenge for origin of life research. After discussing some fundamental experimental and theoretical findings, we investigate a kinetic rate equation model of nucleated cooperative enantioselective polymerization in closed systems [1]. The microreversible scheme includes (i) solution-phase racemization of the monomers, (ii) linear homochiral chain growth by stepwise monomer attachment and (iii) annealing or fusion of chains. Mechanically induced breakage of the longest chains maintains the system out of equilibrium and drives a breakage−fusion recycling mechanism. Spontaneous mirror symmetry breaking can be achieved starting from small initial enantiomeric excesses due to the intrinsic statistical fluctuations. We put our findings into the context of simpler models, trying to understand the onset of symmetry breaking.

[1] C. Blanco, M. Stich, D. Hochberg, J. Phys. Chem. B 121 (2017), 942.

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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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