Regensburg 2016 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 39: Microswimmers II (joint Session BP/DY)

DY 39.3: Vortrag

Mittwoch, 9. März 2016, 12:00–12:15, H45

Run-reverse-flick strategy of interacting bacteria — •Fabian Schwarzendahl, Stephan Herminghaus, and Marco Giacomo Mazza — Max Planck Institute for Dynamics and Self-Organization, Göttingen Am Fassberg 17, 37077 Göttingen, Germany

Bacteria have different swimming strategies for finding nutrition. Escherichia coli follow a run and tumble strategy whereas Vibrio alginolyticus have a run-reverse-flick pattern [1]. We simulate the latter using molecular dynamics to integrate the underlying stochastic equations. Without interactions between the bacteria, the analytical result by Theves [2] is recovered. Furthermore, hard-core interactions are used. Here, we study the effect of particle interactions by varying the filling fraction as well as the ratio of mean forward-to-backward run time (biased run). We find that the diffusion-density coupling parameter has a minimum at a forward to backward runtime ratio of 0.6, which is the value that was measured for Vibrio alginolyticus by Xie et. al. [1]. Furthermore we present an analytical model based on a Fokker-Planck approach.

[1] Li Xie et. al., Proc. Natl. Acad. Sci. USA 108, 2246 - 2251 (2010)

[2] Matthias Theves et. al., Biophys. J. 105, 1915 - 1924 (2013)