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Updated: Apr 6, 2026

In Situ Chemotaxis Assay to Examine Microbial Behavior in Aquatic Ecosystems
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Repulsion from slow-diffusing nutrients improves microbial chemotaxis towards moving sources.

Blox Bloxham1,2, Hyunseok Lee3, Jeff Gore4

  • 1Physics of Living Systems, Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA. blox@hms.harvard.edu.

Nature Communications
|April 4, 2026
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Summary
This summary is machine-generated.

Microbes use a novel "differential strategy" for chemotaxis, combining attraction and repulsion to track moving nutrient sources. This surprising approach enhances nutrient source interception by up to six-fold.

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Area of Science:

  • Microbiology
  • Biophysics
  • Cellular Biology

Background:

  • Chemotaxis, the movement along chemical gradients, is vital for microbes to find nutrients.
  • Paradoxical microbial behaviors, like E. coli repulsion from amino acids, require explanation.

Purpose of the Study:

  • To investigate microbial chemotaxis towards a moving nutrient source.
  • To explain how microbes can overcome challenges in intercepting mobile nutrient sources.

Main Methods:

  • Simulated chemotaxis towards a moving source with multiple chemical signals.
  • Mathematical modeling of nutrient diffusion and microbial response.
  • Analysis of E. coli's known responses to different amino acids.

Main Results:

  • Repulsion from slow-diffusing nutrients combined with attraction to fast-diffusing nutrients improves source interception.
  • This "differential strategy" increases the chance of intercepting a moving source by up to six-fold.
  • The strategy is robust against variations in repellent release rates.

Conclusions:

  • Microbes may use a "differential strategy" to navigate complex chemical environments.
  • This strategy provides a potential explanation for E. coli's repulsion from certain amino acids.
  • Integrating signals from multiple gradients enhances microbial chemotaxis capabilities.