Self-Concentration and Large-Scale Coherence in Bacterial Dynamics

作     者：Christopher Dombrowski Luis Cisneros Sunita Chatkaew Raymond E. Goldstein John O. Kessler 

作者机构：Department of Physics University of Arizona Tucson Arizona 85721 USA Program in Applied Mathematics University of Arizona Tucson Arizona 85721 USA 

出 版 物：《Physical Review Letters》 (Phys Rev Lett)

年 卷 期：2004年第93卷第9期

页      面：098103-098103页

核心收录：

学科分类：07[理学] 0702[理学-物理学] 

基　　金：National Science Foundation  NSF 

主　　题：Bacteriology 

摘      要：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.