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Related Experiment Videos

Modelling run-and-tumble chemotaxis in a shear flow.

R N Bearon1, T J Pedley

  • 1Department of Applied Mathematics and Theoretical Physics, University of Cambridge, U.K. R.Bearon@damtp.cam.ac.uk

Bulletin of Mathematical Biology
|August 12, 2000
PubMed
Summary

Microbial chemotaxis, like that of Escherichia coli, is affected by fluid flow. This study models how shear flow influences bacterial movement and density, revealing a coupling between rotation and chemotaxis.

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Area of Science:

  • Microbiology
  • Fluid Dynamics
  • Biophysics

Background:

  • Chemotactic bacteria exhibit biased random walks influenced by environmental factors.
  • Fluid flow at the microscale can significantly alter bacterial behavior and distribution.

Purpose of the Study:

  • To model the effects of simple shear flow on swimming bacteria.
  • To investigate the coupling between bacterial rotation and chemotaxis.
  • To develop a method for calculating chemotactic flux in unbounded regions.

Main Methods:

  • Modeling bacterial advection and rotation in shear flow.
  • Deriving an advection-diffusion equation for cell density under small chemotactic response.
  • Developing an alternative method for chemotactic flux calculation.

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Main Results:

  • An advection-diffusion equation for cell density was obtained, demonstrating a coupling between rotation and chemotaxis for small responses.
  • A new method for calculating chemotactic flux in unbounded regions was presented.

Conclusions:

  • Shear flow significantly impacts bacterial chemotaxis at the microscopic level.
  • The derived advection-diffusion equation provides insights into the interplay of flow, rotation, and chemotaxis.
  • The alternative flux calculation method offers broader applicability for studying bacterial responses.