Particle diffusion in a quasi-two-dimensional bacterial bath.

@article{Wu2000ParticleDI,
  title={Particle diffusion in a quasi-two-dimensional bacterial bath.},
  author={X L Wu and Albert Libchaber},
  journal={Physical review letters},
  year={2000},
  volume={84 13},
  pages={3017-20}
}
We study the effect of bacterial motion on micron-scale beads in a freely suspended soap film. Given the sizes of bacteria and beads, the geometry of the experiment is quasi-two-dimensional. Large positional fluctuations are observed for beads as large as 10 microm in diameter, and the measured mean-square displacements indicate superdiffusion in short times and normal diffusion in long times. Though the phenomenon is similar to Brownian motions of small particles, its physical origin is… CONTINUE READING

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