Dresden 2014 – scientific programme
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BP: Fachverband Biologische Physik
BP 33: Active cell and tissue mechanics (focus session) I
BP 33.3: Talk
Thursday, April 3, 2014, 10:15–10:30, HÜL 386
Active pulsatory patterns — •Vijay Krishnamurthy1,2, Justin Bois3, Frank Jülicher1, and Stephan Grill1,2,4 — 1Max Planck Institute for the Physics of Complex Systems, Nöthnitzer Straße 38, 01187 Dresden, Germany — 2BIOTEC, Technische Universität Dresden, Tatzberg 47/49, 01307 Dresden, Germany — 3UCLA Department of Chemistry and Biochemistry, 611 Charles E Young Drive East, Los Angeles, CA 90095, USA — 4Max Planck Institute of Molecular Cell Biology and Genetics, Pfotenhauer Straße 108, 01307 Dresden, Germany
We study pulsatory patterns in a system of two chemical species suspended in a thin film active fluid. Active stress in the fluid is regulated by the concentrations of the two species, which diffuse and are also advected by the flows generated by active stress gradients. We demonstrate that this system exhibits spontaneous pulsatory patterns when the following conditions are met: (i) the fast-diffusing species up-regulates the active stress and the slow-diffusing species down-regulates the active stress, or (ii) the active-stress up-regulator turns-over faster compared to the active-stress down-regulator. Our study motivated by the actomyosin cortex of cells provides a simple generic mechanism for oscillatory patterns in active fluids.