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Chemotaxis in Escherichia coli is a sensory-driven motility mechanism that enables bacteria to navigate chemical gradients, moving toward beneficial environments while avoiding harmful conditions. This process relies on a signal transduction system integrating external chemical cues with flagellar motor control.Chemoreceptors and Signal DetectionE. coli detects chemical gradients through methyl-accepting chemotaxis proteins (MCPs), which are membrane-bound chemoreceptors that sense attractants...
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Related Experiment Video

Updated: Feb 10, 2026

Preparation of Janus Particles and Alternating Current Electrokinetic Measurements with a Rapidly Fabricated Indium Tin Oxide Electrode Array
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Bacteria-Activated Janus Particles Driven by Chemotaxis.

Zihan Huang1, Pengyu Chen1, Guolong Zhu1

  • 1State Key Laboratory of Chemical Engineering, Department of Chemical Engineering , Tsinghua University , Beijing 100084 , China.

ACS Nano
|May 24, 2018
PubMed
Summary
This summary is machine-generated.

Bacteria-powered Janus particles exhibit a state transition in transport behavior, moving from random walks to enhanced directional movement based on environmental stimuli intensity. This discovery enables controllable propulsion for biocompatible nano-/microdevices.

Keywords:
Janus particlebacteriachemotaxiscontrollable propulsion directionsecond-order state transition

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Area of Science:

  • Biophysics
  • Materials Science
  • Biomedical Engineering

Background:

  • Motile bacteria offer a promising energy source for biocompatible nano-/micromotors used in drug and cargo delivery.
  • Utilizing bacteria's natural responses, like chemotaxis, in motor fabrication is crucial but challenging.

Purpose of the Study:

  • To investigate the transport dynamics of bacteria-activated Janus particles driven by chemotaxis.
  • To explore how environmental stimuli intensity influences particle transport and locomotion.

Main Methods:

  • Development of a molecular-dynamics model simulating bacterial chemotaxis.
  • Theoretical modeling of particle transport based on bacterial noise and Janus geometries.

Main Results:

  • Observed a second-order state transition in Janus particle transport with increasing stimuli intensity.
  • Transport shifted from a composite random walk to enhanced directional locomotion with size-dependent reversal.
  • Presented a state diagram mapping transport behavior based on stimuli intensity and particle size.

Conclusions:

  • Bacterial chemotaxis can drive anisotropic particle transport, enabling controllable and predictable propulsion.
  • Stimulus-response mechanisms and asymmetrical design are key for developing advanced biocompatible nano-/microdevices.