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Pattern formation by bacteria-driven flow.

N G Cogan1, Charles W Wolgemuth

  • 1Department of Mathematics, Tulane University, New Orleans, Louisiana 70118, USA.

Biophysical Journal
|February 1, 2005
PubMed
Summary
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Marine bacteria form veils, creating hexagonal holes through self-generated fluid flow. This process, modeled mathematically, explains pattern formation and bacterial aggregation in sediments and potentially other biological systems.

Area of Science:

  • Marine microbiology
  • Biophysics
  • Pattern formation

Background:

  • Marine bacteria form mucosal veils on sulfidic sediments.
  • Bacteria within veils swim and generate fluid forces.
  • Veil structures develop hexagonal patterns over time.

Purpose of the Study:

  • To model pattern formation induced by force-generating bodies in a fluid layer.
  • To understand the mechanism behind hexagonal hole formation in bacterial veils.
  • To investigate bacterial aggregation driven by fluid dynamics.

Main Methods:

  • Development of a simplified mathematical model.
  • Analytic and numerical analysis of the model.
  • Comparison of model predictions with biological observations.

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Main Results:

  • A novel instability driven by fluid flow and diffusion causes bacterial aggregation.
  • The model accurately predicts the length scale and timescale of veil pattern formation.
  • Identified competition between fluid flow and diffusion as key drivers.

Conclusions:

  • The study provides a model for pattern formation in biological systems with force-generating components.
  • Bacterial aggregation is explained by self-generated fluid dynamics.
  • Similar principles may apply to other biological systems like bryozoan colonies.