Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

BP: Fachverband Biologische Physik

BP 33: Active cell and tissue mechanics (focus session) I

BP 33.9: Vortrag

Donnerstag, 3. April 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 Grill^1,2, 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.