DFG-Sonderforschungsbereich 555 "Komplexe Nichtlineare Prozesse"

Fritz-Haber-Institut der Max-Planck-Gesellschaft, Max-Delbrück-Centrum für molekulare Medizin Berlin, Otto-von-Guericke-Universität Magdeburg, Physikalisch-Technische Bundesanstalt, Technische Universität Berlin

"Complex Nonlinear Processes in Chemistry and Biology"

Honorary Chairman: Gerhard Ertl

Organizers:M. Bär, H. Engel, M. Falcke, M. Hauser, A. S. Mikhailov, P. Plath, H. Stark
Address:Richard-Willstätter-Haus, Faradayweg 10, 14195 Berlin-Dahlem. (Click here for a description how to get there.)

For information please contact Oliver Rudzick, Tel. (030) 8413 5300, rudzick@fhi-berlin.mpg.de.

[This is the old program from WS 2008/09. The current program and contact information can be found here.]

17 October 2008, 16:00

Sergio Alonso (Physikalisch-Technische Bundesanstalt, Berlin)
Effective medium theory for heterogeneous reaction-diffusion systems [Abstract]

31 October 2008, 16:00

Tetsuo Ueda (Research Institute for Electronic Science, Hokkaido University, Japan)
Nonlinear processes in Physarum: Towards an understanding of the cellular behavioral intelligence [Abstract]

14 November 2008, 16:00

Alain Karma (Department of Physics, Northeastern University, Boston, USA)
Spatiotemporal patterns of voltage and calcium signaling in heart cells and tissue [Abstract]

21 November 2008, 16:00

Alexander V. Panfilov (Department of Theoretical Biology, Utrecht University, The Netherlands)
Modeling mechano-electric feedback in the heart using reaction-diffusion mechanics systems

Cardiac contraction is initiated by the propagation of electrical waves in the heart. Contraction of cardiac tissue also affects the process of wave propagation. This is called mechano-electrical feedback. In my talk I will briefly report on our approach and present results of our study on possible effects of mechanical activity. We use a combination of an electrophysiological model of cardiac tissue (either of FitzHugh Nagumo type, or using a detailed ionic model for human ventricular cells developed in our group) coupled with the nonlinear stress equilibrium equations that govern tissue mechanics. We show that for some parameter values, mechano-electric feedback can induce automaticity in an array of otherwise non-oscillatory cardiac cells, and illustrate the spatio-temporal dynamics of these pacemakers. We also demonstrate the significant effects of mechano-electric feedback on re-entrant wave dynamics. We show that contraction can induce drift of an otherwise stationary rotating spiral wave. In certain cases, mechano-electric feedback can induce breakup of a single re-entrant wave into complex fibrillatory patterns, and we discuss the mechanism of this process based on the accommodation phenomenon. We also show our computations of mechano-electric feedback in an anatomically realistic model of the left ventricle of the human heart.

28 November 2008, 16:00

Karsten Peters (Institut für Wirtschaft und Verkehr, Technische Universität Dresden)
Structural properties of functional networks in biological and technical systems [Abstract]

05 December 2008, 16:00 Haber-Villa

Takao Ohta (Department of Physics, Kyoto University, Japan)
External forcing and feedback control of nonlinear dissipative waves [Abstract]

13 February 2009, 16:00

Frank Spahn (LS Nichtlineare Dynamik, Institut für Physik und Astronomie, Universität Potsdam)
What tell "propellers" in Saturns rings about planet formation? [Abstract]

Download the seminar program as PDF (ca. 99 kB)

Seminar program SS 2008

Seminar program WS 2007/08

Seminar program SS 2007

Seminar program WS 2006/07

Seminar program SS 2006

Seminar program WS 2005/06

Seminar program SS 2005

Seminar program WS 2004/05

last modified: January 15, 2009 / Oliver Rudzick

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