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Quantitative Locomotion Study of Freely Swimming Micro-organisms Using Laser Diffraction
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Published on: October 25, 2012

Enhanced diffusion by reciprocal swimming.

Eric Lauga1

  • 1Department of Mechanical and Aerospace Engineering, University of California San Diego, 9500 Gilman Drive, La Jolla, California 92093-0411, USA.

Physical Review Letters
|June 4, 2011
PubMed
Summary
This summary is machine-generated.

Reciprocal swimmers in fluctuating environments exhibit enhanced diffusion, overcoming Purcell's scallop theorem. This motion provides a significant advantage for microorganisms like marine bacteria.

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Area of Science:

  • Physics
  • Biophysics
  • Fluid Dynamics

Background:

  • Purcell's scallop theorem posits that time-reversible (reciprocal) motion is ineffective for swimming at low Reynolds numbers.
  • Microorganisms often operate in low Reynolds number regimes where such limitations are significant.

Purpose of the Study:

  • To investigate if reciprocal swimmers can achieve net motion in a fluctuating environment.
  • To quantify the enhanced diffusion and motility of reciprocal swimmers under non-ideal conditions.

Main Methods:

  • Numerical simulations of swimmer dynamics.
  • Theoretical calculations based on fluid dynamics principles.

Main Results:

  • Reciprocal swimmers exhibit diffusive dynamics on larger time scales.
  • Enhanced diffusivities, potentially orders of magnitude greater than normal translational diffusion, were observed.
  • Reciprocal actuation provides a significant advantage over nonmotile behavior.

Conclusions:

  • Fluctuating environments enable effective locomotion for reciprocal swimmers.
  • This enhanced diffusion mechanism offers a significant advantage for small organisms, such as marine bacteria, enabling motility where it was previously thought impossible.