Swarming dynamics in bacterial colonies

被引：107

作者：

Zhang, H. P. ^{[1
]}

Be'er, Avraham

Smith, Rachel S.

Florin, E. -L.

Swinney, Harry L.

机构：

[1] Univ Texas Austin, Ctr Nonlinear Dynam, Austin, TX 78712 USA

来源：

EPL | 2009年 / 87卷 / 04期

关键词：

GIANT NUMBER FLUCTUATIONS; DEPENDS; SURFACE; SYSTEM;

D O I：

10.1209/0295-5075/87/48011

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We determine and relate the characteristic velocity, length, and time scales for bacterial motion in swarming colonies of Paenibacillus dendritiformis growing on semi-solid agar substrates. The bacteria swim within a thin fluid layer, and they form long-lived jets and vortices. These coherent structures lead to anisotropy in velocity spatial correlations and to a two-step relaxation in velocity temporal correlations. The mean squared displacement of passive tracers exhibits a short-time regime with nearly ballistic transport and a diffusive long-time regime. We find that various definitions of the correlation length all lead to length scales that are, surprisingly, essentially independent of the mean bacterial speed, while the correlation time is linearly proportional to the ratio of the correlation length to the mean speed. Copyright (c) EPLA, 2009

引用

页数：5

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