Enhanced diffusion of nonswimmers in a three-dimensional bath of motile bacteria
arXiv:1307.1274 · doi:10.1103/PhysRevE.88.041002
Abstract
We show, using differential dynamic microscopy, that the diffusivity of non-motile cells in a three-dimensional (3D) population of motile E. coli is enhanced by an amount proportional to the active cell flux. While non-motile mutants without flagella and mutants with paralysed flagella have quite different thermal diffusivities and therefore hydrodynamic radii, their diffusivities are enhanced to the same extent by swimmers in the regime of cell densities explored here. Integrating the advective motion of non-swimmers caused by swimmers with finite persistence-length trajectories predicts our observations to within 2%, indicating that fluid entrainment is not relevant for diffusion enhancement in 3D.
5 pages, 3 figures
References in corpus (8)
- Fluid dynamics and noise in bacterial cell-cell and cell-surface scattering
- Diffusive transport without detailed balance in motile bacteria: Does microbiology need statistical physics?
- Differential Dynamic Microscopy: Probing wave vector dependent dynamics with a microscope
- Self-Starting Micromotors in a Bacterial Bath
- Differential Dynamic Microscopy of Bacterial Motility
- Differential Dynamic Microscopy: a High-Throughput Method for Characterizing the Motility of Microorganism
- Fluctuations and Rheology in Active Bacterial Suspensions
- Swimmer-tracer scattering at low Reynolds number
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