Self-concentration and large-scale coherence in bacterial dynamics
Self-concentration and large-scale coherence in bacterial dynamics
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DOI：
10.1103/physrevlett.93.098103
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发表时间：
2004-08-27
影响因子：
8.6
通讯作者：
Kessler, JO
中科院分区：
文献类型：
--
作者：
Dombrowski, C;Cisneros, L;Kessler, JO
好氧细菌的悬浮液经常在趋化性和浮力的相互作用下产生流动。我们发现，在无柄滴，流动相关的那些在抵制沉淀效应进行生物对流羽流下降的倾斜弯月面和集中细胞在下降的边缘，而在悬垂下降，这种自我集中发生在底部。在比细胞大得多的尺度上，两种几何形状的集中区域都表现出瞬态的、重组的、高速的喷流，它们被涡街所跨越。基于游动细胞之间的流体动力学相互作用，提出了一种大尺度相干机制。
Suspensions of aerobic bacteria often develop flows from the interplay of chemotaxis and buoyancy. We find in sessile drops that flows related to those in the Boycott effect of sedimentation carry bioconvective plumes down the slanted meniscus and concentrate cells at the drop edge, while in pendant drops such self-concentration occurs at the bottom. On scales much larger than a cell, concentrated regions in both geometries exhibit transient, reconstituting, high-speed jets straddled by vortex streets. A mechanism for large-scale coherence is proposed based on hydrodynamic interactions between swimming cells.