Volume 111, Number 5, September 2015
|Number of page(s)||6|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||21 September 2015|
Dynamic clustering in suspension of motile bacteria
1 Department of Physics and Astronomy and Institute of Natural Sciences, Shanghai Jiao Tong University Shanghai, China
2 Beijing National Laboratory for Condensed Matter Physics and Key Laboratory of Soft Matter Physics, Institute of Physics, Chinese Academy of Sciences - Beijing, China
3 Collaborative Innovation Center of Advanced Microstructures - Nanjing, China
Received: 11 June 2015
Accepted: 24 August 2015
Bacteria suspension exhibits a wide range of collective phenomena, arising from interactions between individual cells. Here we show Serratia marcescens cells near an air-liquid interface spontaneously aggregate into dynamic clusters through surface-mediated hydrodynamic interactions. These long-lived clusters translate randomly and rotate in the counterclockwise direction; they continuously evolve, merge with others and split into smaller ones. Measurements indicate that long-ranged hydrodynamic interactions have strong influences on cluster properties. Bacterial clusters change material and fluid transport near the interface and hence may have environmental and biological consequences.
PACS: 47.63.Gd – Swimming microorganisms / 87.18.Gh – Cell-cell communication; collective behavior of motile cells / 87.17.Jj – Cell locomotion, chemotaxis
© EPLA, 2015
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