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Bacterial active matter.

Igor S Aranson1

  • 1Departments of Biomedical Engineering, Chemistry, and Mathematics, Pennsylvania State University, University Park, PA 16802, United States of America.

Reports on Progress in Physics. Physical Society (Great Britain)
|May 23, 2022
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Summary
This summary is machine-generated.

This study explores bacterial active matter, focusing on how motile bacteria suspensions exhibit complex collective behaviors like bacterial turbulence. It reviews physics-based findings on their movement, fluid properties, and responses to external factors.

Keywords:
active matterbacteriacollective behaviorself-propelled motion

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Area of Science:

  • Physics
  • Microbiology
  • Active Matter Physics

Background:

  • Bacteria are ancient, abundant microorganisms vital to global biogeochemical cycles.
  • Motile bacteria suspensions are model systems for active matter, converting chemical energy into mechanical motion.
  • Concentrated bacterial suspensions (active fluids) display emergent collective behaviors, including bacterial turbulence and swarming.

Purpose of the Study:

  • To report on the progress in understanding bacterial active matter from a physics perspective.
  • To critically assess theoretical approaches and experimental results in the field.
  • To investigate the influence of visco-elasticity, liquid crystallinity, and confinement on bacterial collective behavior.

Main Methods:

  • Review of key experimental findings in bacterial active matter research.
  • Critical assessment of major theoretical frameworks used to model bacterial suspensions.
  • Analysis of factors such as visco-elasticity, liquid crystallinity, and confinement effects.

Main Results:

  • Bacterial activity significantly impacts the effective viscosity and diffusivity of suspensions.
  • Collective behaviors like bacterial turbulence and swarming are characteristic of concentrated bacterial fluids.
  • External factors like confinement and material properties (visco-elasticity, liquid crystallinity) modulate these behaviors.

Conclusions:

  • Bacterial active matter presents a rich area of study with complex emergent phenomena.
  • A multidisciplinary approach combining physics and microbiology is crucial for understanding these systems.
  • Further research is needed to fully elucidate the interplay between bacterial activity and suspension properties.