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Introducing Shear Stress in the Study of Bacterial Adhesion
13:28

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Published on: September 2, 2011

Buckling instability in ordered bacterial colonies.

Denis Boyer1, William Mather, Octavio Mondragón-Palomino

  • 1Laboratoire de Physique Théorique, IRSAMC, CNRS UMR 5152, Université Paul Sabatier, 31062 Toulouse, France.

Physical Biology
|March 2, 2011
PubMed
Summary
This summary is machine-generated.

Growing bacterial colonies can become unstable due to mechanical forces. This study reveals that nematically ordered cell populations are prone to buckling instability, impacting their spatial organization.

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Area of Science:

  • Microbiology
  • Biophysics
  • Cellular Mechanics

Background:

  • Bacterial colonies display complex spatio-temporal organization influenced by cell properties and communication.
  • Mechanical contact among cells in dense colonies like biofilms is a key factor in spatial organization.
  • Previous studies showed Escherichia coli alignment along flow in confined environments, but ordering was imperfect.

Purpose of the Study:

  • To investigate the mechanism causing persistent disorder in growing bacterial cell populations.
  • To understand the buckling instability in nematically ordered growing cell colonies.

Main Methods:

  • Experimental observation of growing bacterial colonies.
  • Theoretical analysis of cell population mechanics.
  • Discrete-element simulations of cell behavior.

Main Results:

  • Growing colonies of nematically ordered cells exhibit buckling instability.
  • The instability arises from the anisotropic stress tensor within the ordered cell colony.
  • This buckling contributes to imperfect orientational ordering in cell populations.

Conclusions:

  • Mechanical forces and resulting instabilities play a significant role in bacterial colony organization.
  • The anisotropic stress tensor is a critical factor driving buckling instability in ordered cell populations.
  • Understanding these mechanical instabilities is crucial for predicting bacterial colony development.