TY - GEN
T1 - Large-scale collective behavior of swimming microorganisms at high concentrations
AU - Sokolov, Andrey
AU - Aranson, Igor S.
AU - Kessler, John O.
AU - Goldstein, Raymond E.
PY - 2009
Y1 - 2009
N2 - Suspensions of motile bacteria such as Bacillus subtilus or E. coli form a dynamical state exhibiting extended spatio-temporal organization at concentrations near the maximum allowed by steric repulsion. The viscous liquid into which locomotive energy of individual microorganisms is transferred also carries interactions that drive the self-organization. The concentration dependence of collective swimming state correlation length is probed here with a novel technique (bacterial crowd control) that herds bacteria into condensed populations of adjustable concentration. For the free-standing thin-film geometry employed, the correlation length varies smoothly and monotonically through the transition from individual to collective behavior. Using insights from these experiments, we develop a specific model incorporating hydrodynamic interactions in thin-film geometries and show by numerical studies that it displays large scale persistently recurring vortices, as actually observed.
AB - Suspensions of motile bacteria such as Bacillus subtilus or E. coli form a dynamical state exhibiting extended spatio-temporal organization at concentrations near the maximum allowed by steric repulsion. The viscous liquid into which locomotive energy of individual microorganisms is transferred also carries interactions that drive the self-organization. The concentration dependence of collective swimming state correlation length is probed here with a novel technique (bacterial crowd control) that herds bacteria into condensed populations of adjustable concentration. For the free-standing thin-film geometry employed, the correlation length varies smoothly and monotonically through the transition from individual to collective behavior. Using insights from these experiments, we develop a specific model incorporating hydrodynamic interactions in thin-film geometries and show by numerical studies that it displays large scale persistently recurring vortices, as actually observed.
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U2 - 10.1007/978-3-540-77074-9_51
DO - 10.1007/978-3-540-77074-9_51
M3 - Conference contribution
AN - SCOPUS:84890322408
SN - 9783540770732
T3 - Traffic and Granular Flow 2007
SP - 455
EP - 470
BT - Traffic and Granular Flow 2007
PB - Springer Science and Business Media Deutschland GmbH
T2 - 7th International Conference on Traffic and Granular Flow, TGF 2007
Y2 - 20 June 2007 through 22 June 2007
ER -