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

DY: Fachverband Dynamik und Statistische Physik

DY 23: Statistical Physics in Biological Systems II (joint with BP)

DY 23.7: Vortrag

Mittwoch, 13. März 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.