Concentration dependence of the collective dynamics of swimming bacteria
Concentration dependence of the collective dynamics of swimming bacteria
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DOI：
10.1103/physrevlett.98.158102
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发表时间：
2007-04-13
影响因子：
8.6
通讯作者：
Goldstein, Raymond E.
中科院分区：
文献类型：
--
作者：
Sokolov, Andrey;Aranson, Igor S.;Goldstein, Raymond E.
在空间排斥允许的最大值附近的浓度，游泳细菌形成一个动态的状态，表现出扩展的时空相干性。单个微生物的运动能量被转移到其中的粘性流体也携带驱动相干性的相互作用。在集体状态的相关性的浓度依赖性在这里探讨了一种新的技术，羊群的细菌成浓缩的人口的可调浓度。对于所采用的特定薄膜几何形状，相关长度通过从个体行为到集体行为的过渡而平滑且单调地变化。
At concentrations near the maximum allowed by steric repulsion, swimming bacteria form a dynamical state exhibiting extended spatiotemporal coherence. The viscous fluid into which locomotive energy of individual microorganisms is transferred also carries interactions that drive the coherence. The concentration dependence of correlations in the collective state is probed here with a novel technique that herds bacteria into condensed populations of adjustable concentration. For the particular thin-film geometry employed, the correlation lengths vary smoothly and monotonically through the transition from individual to collective behavior.