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Related Experiment Videos

Self-concentration and large-scale coherence in bacterial dynamics.

Christopher Dombrowski1, Luis Cisneros, Sunita Chatkaew

  • 1Department of Physics, University of Arizona, Tucson, Arizona 85721, USA.

Physical Review Letters
|September 28, 2004
PubMed
Summary

Aerobic bacteria suspensions form complex flows in drops due to chemotaxis and buoyancy. These bioconvective plumes create jets and vortex streets, driven by hydrodynamic interactions between cells.

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Area of Science:

  • Microbiology
  • Fluid Dynamics
  • Biophysics

Background:

  • Aerobic bacteria suspensions exhibit complex fluid behaviors.
  • Chemotaxis and buoyancy are key factors influencing bacterial movement and distribution.
  • The Boycott effect describes sedimentation-driven flow patterns.

Purpose of the Study:

  • To investigate the fluid dynamics of aerobic bacteria in sessile and pendant drops.
  • To understand the formation of bioconvective plumes and cell self-concentration.
  • To elucidate the mechanisms behind large-scale flow coherence in bacterial suspensions.

Main Methods:

  • Observation of bacterial suspensions in sessile and pendant drops.
  • Analysis of flow patterns, including bioconvective plumes, jets, and vortex streets.

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  • Theoretical modeling of hydrodynamic interactions between swimming cells.

    • Main Results:

    • Bioconvective plumes concentrate cells at the drop edge (sessile) or bottom (pendant).
    • Concentrated bacterial regions form transient, high-speed jets and vortex streets.
    • Hydrodynamic interactions are proposed as a mechanism for large-scale flow coherence.

    Conclusions:

    • Bacterial chemotaxis and buoyancy drive distinct self-concentration phenomena in different drop geometries.
    • Emergent large-scale structures like jets and vortex streets arise from collective cell behavior.
    • Hydrodynamic interactions are crucial for understanding the collective dynamics of microbial populations.