Dresden 2014 – scientific programme
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BP: Fachverband Biologische Physik
BP 33: Active cell and tissue mechanics (focus session) I
BP 33.9: Talk
Thursday, April 3, 2014, 12:15–12:30, HÜL 386
Pattern formation in nematic active fluids — •Fabio Staniscia1, Anne-Cécile Reymann2, Ralph Bohme2, Justin Bois3, Frank Jülicher1, Stephan Grill1,2, and Guillaume Salbreux1 — 1Max Planck Institute for the Physics of Complex Systems, Dresden, Germany — 2Max Planck Institute of Molecular Cell Biology and Genetics, Dresden, Germany — 3UCLA Department of Chemistry and Biochemistry, Los Angeles, USA
We study the patterns formed in a nematic active fluid submitted to active stress generated by myosin activity. The fluid is described by a hydrodynamic theory including the fields of myosin concentration, actin velocity and nematic order parameter describing the local alignment of actin filaments. The pattern-forming region in the parameters space is found through a linear stability analysis, and the effects of the nonlinearities is studied both analytically and numerically. The structure and dynamics of these patterns are reminiscent of the process of formation of myosin foci connected by actin cables in the C. Elegans embryo cortex. Using measurements of the velocity and alignment profiles in the polarization flow of the C. Elegans embryo, we can show that there is indeed a relation between these two quantities which can be explained by our model.