Journal
PHYSICAL REVIEW LETTERS
Volume 113, Issue 26, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.113.268101
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Funding
- Royal Society
- UK Engineering and Physical Sciences Research Council [EP/I004262/1, EP/J007404/1]
- European Union [FP7-PEOPLE] [PIIF-GA-2010-276190]
- European Research Council (ADG-PHYAPS)
- EPSRC [EP/I004262/1, EP/J007404/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/I004262/1, EP/J007404/1] Funding Source: researchfish
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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 similar to 10%. Our findings show similarities with the physics of a rarefied gas in a spherical cavity with attractive walls.
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