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Updated: May 24, 2026

Visualizing Bacterial Motility Based on a Color Reaction
04:44

Visualizing Bacterial Motility Based on a Color Reaction

Published on: February 15, 2022

Bacterial rheotaxis.

Marcos1, Henry C Fu, Thomas R Powers

  • 1School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore 639798, Singapore.

Proceedings of the National Academy of Sciences of the United States of America
|March 14, 2012
PubMed
Summary
This summary is machine-generated.

Bacteria exhibit rheotaxis, a physical response to fluid flow. This previously unknown bacterial movement, driven by flagella and fluid velocity gradients, impacts motility in diverse environments.

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Investigating Flagella-Driven Motility in Escherichia coli by Applying Three Established Techniques in a Series
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Investigating Flagella-Driven Motility in Escherichia coli by Applying Three Established Techniques in a Series

Published on: May 10, 2020

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Last Updated: May 24, 2026

Visualizing Bacterial Motility Based on a Color Reaction
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Investigating Flagella-Driven Motility in Escherichia coli by Applying Three Established Techniques in a Series
07:59

Investigating Flagella-Driven Motility in Escherichia coli by Applying Three Established Techniques in a Series

Published on: May 10, 2020

Area of Science:

  • Microbiology
  • Biophysics
  • Fluid Dynamics

Background:

  • Organism motility is often directed by environmental stimuli.
  • Rheotaxis, directed movement along fluid velocity gradients, is well-documented in larger aquatic organisms.
  • The existence and mechanisms of rheotaxis in bacteria were previously uncharacterized.

Purpose of the Study:

  • To investigate and demonstrate rheotaxis in bacteria.
  • To elucidate the physical mechanisms underlying bacterial rheotaxis.
  • To assess the ecological and physiological implications of bacterial rheotaxis.

Main Methods:

  • Utilizing precisely controlled microfluidic flows to study bacterial movement.
  • Conducting experiments with Bacillus subtilis.
  • Developing and applying a mathematical model for quantitative comparison.

Main Results:

  • Rheotaxis was experimentally confirmed in Bacillus subtilis.
  • Bacterial rheotaxis was found to be a purely physical phenomenon, driven by flagellar shape and fluid velocity gradients.
  • The generated torque is independent of surfaces, enabling rheotaxis in bulk fluid.

Conclusions:

  • Bacterial rheotaxis is a novel taxis, distinct from chemotaxis.
  • This phenomenon occurs in various bacterial habitats, including natural and host environments.
  • Bacterial rheotaxis can potentially reduce the effectiveness of chemotaxis and bacterial motility benefits in certain hydrodynamic conditions.