Regensburg 2013 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 23: Statistical Physics in Biological Systems II (joint with BP)
DY 23.7: Talk
Wednesday, March 13, 2013, 16:45–17:00, H43
On the collective motion of Chlamidomonas cells — •Johannes Greber1, Salima Rafai2, Philippe Peyla2, and Walter Zimmermann1 — 1Universität Bayreuth, D-95447 Bayreuth, Germany — 2Universite Joseph Fourier, F-38402 Grenoble, France
Swimming Chlamydomonas cells have a n eyespot registrating light comming from a light source far away enabling the cell to orient its direction of motion towards the light. This motion is called phototaxis.
During the propelling process, each cell generates a flow field with an atracting part in the direction of motion and a repelling part perpendicular to this direction. Due to this flow field a stable collectiv motion of a cloud of cells is impossible as long as no direction of motion is prefered by the cells.
We present experimental results and a theoretical analysis based on a model called "Puller" on the collectiv motion of Chlamydomonas cells.