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Bacteria Optimize Tumble Bias to Strategically Navigate Surface Constraints.

Antai Tao1, Guangzhe Liu1,2,3, Rongjing Zhang1

  • 1Hefei National Research Center for Physical Sciences at the Microscale and Department of Physics, University of Science and Technology of China, Hefei, Anhui, 230026, P. R. China.

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Summary
This summary is machine-generated.

Bacteria use surface exploration strategies to persist. Their surface residence time and movement efficiency are optimized near wild-type Escherichia coli tumble bias, aiding nutrient seeking and survival.

Keywords:
bacterial motilitybiofilmdiffusivityliquid‐solid interfaceoptical tweezers

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Area of Science:

  • Microbiology
  • Biophysics
  • Cell Biology

Background:

  • Bacteria interact with solid surfaces, which offer opportunities like biofilm formation but also challenges such as restricted movement.
  • Surface-bound bacteria may experience constrained movement, limiting their exploration compared to free-swimming counterparts.

Purpose of the Study:

  • To investigate how bacteria strategically navigate surface environments.
  • To understand the relationship between bacterial swimming behavior, surface residence time, and exploration efficiency.

Main Methods:

  • Systematic single-cell behavioral measurements.
  • Phenomenological modeling and theoretical analysis.

Main Results:

  • Bacterial surface residence time decreases with increasing tumble bias, plateauing at the wild-type Escherichia coli value (≈0.25).
  • Bacterial surface diffusivity peaks near this mean tumble bias.
  • Phenotypic variation in tumble bias, influenced by gene expression noise, leads to distinct surface behaviors.

Conclusions:

  • Bacterial surface navigation strategies are linked to persistence and survival.
  • Offspring with varying tumble biases exhibit adaptive behaviors: swift surface escape or efficient 2D exploration for nutrients.
  • This phenotypic variation allows bacteria to optimize survival in diverse surface-associated conditions.