A bacterial swimmer with two alternating speeds of propagation

  • Theves M
  • Taktikos J
  • Zaburdaev V
 et al. 
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Abstract

We recorded large data sets of swimming trajectories of the soil bacterium Pseudomonas putida. Like other prokaryotic swimmers, P. putida exhibits a motion pattern dominated by persistent runs that are interrupted by turning events. An in-depth analysis of their swimming trajectories revealed that the majority of the turning events is characterized by an angle of1= 180 (reversals). To a lesser extent, turning angles of2= 0 are also found. Remarkably, we observed that, upon a reversal, the swimming speed changes by a factor of two on average - a prominent feature of the motion pattern that, to our knowledge, has not been reported before. A theoretical model, based on the experimental values for the average run time and the rotational diffusion, recovers the mean-square displacement of P. putida if the two distinct swimming speeds are taken into account. Compared to a swimmer that moves with a constant intermediate speed, the mean-square displacement is strongly enhanced. We furthermore observed a negative dip in the directional autocorrelation at intermediate times, a feature that is only recovered in an extended model, where the nonexponential shape of the run-time distribution is taken into account. © 2013 Biophysical Society.

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Authors

  • Holger StarkHeinrich Heine University Dusseldorf Institute for Pharmaceutical and Medicinal Chemistry

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  • Matthias Theves

  • Johannes Taktikos

  • Vasily Zaburdaev

  • Carsten Beta

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