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Multi-scale Analysis of Bacterial Growth Under Stress Treatments
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Published on: November 28, 2019

Scale-invariant correlations in dynamic bacterial clusters.

Xiao Chen1, Xu Dong, Avraham Be'er

  • 1Department of Physics and Institute of Natural Sciences, Shanghai Jiao Tong University, China.

Physical Review Letters
|May 1, 2012
PubMed
Summary
This summary is machine-generated.

In Bacillus subtilis colonies, bacteria move collectively, forming dynamic clusters. Velocity and orientation fluctuations within these clusters show scale-invariant spatial correlations, similar to bird flocks.

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Area of Science:

  • Microbiology
  • Physics
  • Biophysics

Background:

  • Motile bacteria like Bacillus subtilis exhibit collective motion.
  • This collective behavior forms dynamic clusters, analogous to polarized systems like bird flocks and fish schools.

Purpose of the Study:

  • To experimentally investigate spatial correlations of velocity and orientation fluctuations within bacterial clusters.
  • To understand the scale-invariant properties of collective motion in Bacillus subtilis.

Main Methods:

  • Experimental study of Bacillus subtilis colonies.
  • Analysis of velocity and orientation fluctuations within bacterial clusters.
  • Measurement of spatial correlation functions.

Main Results:

  • Correlation length was found to be approximately 30% of the cluster size across various densities and sizes.
  • Rescaled correlation functions collapsed onto a master curve.
  • Demonstrated scale-invariant correlations of velocity and orientation fluctuations.

Conclusions:

  • Bacterial clusters exhibit scale-invariant properties in their collective motion.
  • Spatial correlations of fluctuations are a key characteristic of dynamic bacterial clusters.
  • Findings contribute to understanding emergent behavior in biological systems.