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Large-Scale Collective Behavior of Swimming Microorganisms at High Concentrations

In: Traffic and Granular Flow ’07

Author

Listed:
  • Andrey Sokolov

    (Argonne National Laboratory
    Illinois Institute of Technology)

  • Igor S. Aranson

    (Argonne National Laboratory)

  • John O. Kessler

    (University of Arizona, Department of Physics)

  • Raymond E. Goldstein

    (University of Cambridge, Department of Applied Mathematics and Theoretical Physics)

Abstract

Summary Suspensions of motile bacteria such as Bacillus subtilus or E. coli form a dynamical state exhibiting extended spatio-temporal organization at concentrations near the maximum allowed by steric repulsion. The viscous liquid into which locomotive energy of individual microorganisms is transferred also carries interactions that drive the self-organization. The concentration dependence of collective swimming state correlation length is probed here with a novel technique (bacterial crowd control) that herds bacteria into condensed populations of adjustable concentration. For the free-standing thin-film geometry employed, the correlation length varies smoothly and monotonically through the transition from individual to collective behavior. Using insights from these experiments, we develop a specific model incorporating hydrodynamic interactions in thin-film geometries and show by numerical studies that it displays large scale persistently recurring vortices, as actually observed.

Suggested Citation

  • Andrey Sokolov & Igor S. Aranson & John O. Kessler & Raymond E. Goldstein, 2009. "Large-Scale Collective Behavior of Swimming Microorganisms at High Concentrations," Springer Books, in: Cécile Appert-Rolland & François Chevoir & Philippe Gondret & Sylvain Lassarre & Jean-Patrick Lebacq (ed.), Traffic and Granular Flow ’07, pages 455-470, Springer.
    • Handle: RePEc:spr:sprchp:978-3-540-77074-9_51
    DOI: 10.1007/978-3-540-77074-9_51
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