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Biophys J. 2006 Jan 15;90(2):400-12. Epub 2005 Oct 20.

Swimming in circles: motion of bacteria near solid boundaries.

Author information

1
Division of Engineering and Applied Sciences, and Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02139, USA. lauga@mit.edu

Abstract

Near a solid boundary, Escherichia coli swims in clockwise circular motion. We provide a hydrodynamic model for this behavior. We show that circular trajectories are natural consequences of force-free and torque-free swimming and the hydrodynamic interactions with the boundary, which also leads to a hydrodynamic trapping of the cells close to the surface. We compare the results of the model with experimental data and obtain reasonable agreement. In particular, the radius of curvature of the trajectory is observed to increase with the length of the bacterium body.

PMID:
16239332
PMCID:
PMC1367047
DOI:
10.1529/biophysj.105.069401
[Indexed for MEDLINE]
Free PMC Article

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