Filling an emulsion drop with motile bacteria
arXiv:1407.6859 · doi:10.1103/PhysRevLett.113.268101
Abstract
We have measured the spatial distribution of motile Escherichia coli inside spherical water droplets emulsified in oil. At low cell concentrations, the cell density peaks at the water-oil interface; at increasing concentration, the bulk of each droplet fills up uniformly while the surface peak remains. Simulations and theory show that the bulk density results from a `traffic' of cells leaving the surface layer, increasingly due to cell-cell scattering as the surface coverage rises above . Our findings show similarities with the physics of a rarefied gas in a spherical cavity with attractive walls.
arXiv comment5 pages, 4 figures, Supporting Information (5 pages, 5 figures)
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