Scale-Invariant Correlations in Dynamic Bacterial Clusters

被引：133

作者：

Chen, Xiao ^{[1
,2
]}

Dong, Xu ^{[1
,2
]}

Be'er, Avraham ^{[3
]}

Swinney, Harry L. ^{[4
,5
]}

Zhang, H. P. ^{[1
,2
]}

机构：

[1] Shanghai Jiao Tong Univ, Dept Phys, Shanghai, Peoples R China

[2] Shanghai Jiao Tong Univ, Inst Nat Sci, Shanghai, Peoples R China

[3] Ben Gurion Univ Negev, Zuckerberg Inst Water Res, IL-84105 Beer Sheva, Israel

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

[5] Univ Texas Austin, Dept Phys, Austin, TX 78712 USA

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 108卷 / 14期

基金：

中国国家自然科学基金;

关键词：

COLLECTIVE BEHAVIOR; SELF-ORGANIZATION; HYDRODYNAMICS; FLUCTUATIONS; MECHANICS; MOTION; CELL;

D O I：

10.1103/PhysRevLett.108.148101

中图分类号：

O4 [物理学];

学科分类号：

070305 [高分子化学与物理];

摘要：

In Bacillus subtilis colonies, motile bacteria move collectively, spontaneously forming dynamic clusters. These bacterial clusters share similarities with other systems exhibiting polarized collective motion, such as bird flocks or fish schools. Here we study experimentally how velocity and orientation fluctuations within clusters are spatially correlated. For a range of cell density and cluster size, the correlation length is shown to be 30% of the spatial size of clusters, and the correlation functions collapse onto a master curve after rescaling the separation with correlation length. Our results demonstrate that correlations of velocity and orientation fluctuations are scale invariant in dynamic bacterial clusters.

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