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

Seminar
"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
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[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
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[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
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[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
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Abstract:
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
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[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
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[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?
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[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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