Hydrodynamic attraction of swimming microorganisms by surfaces

被引：652

作者：

Berke, Allison P. ^{[2
]}

Turner, Linda ^{[3
]}

Berg, Howard C. ^{[3
,4
]}

Lauga, Eric ^{[1
]}

机构：

[1] Univ Calif San Diego, Dept Mech & Aerosp Engn, La Jolla, CA 92093 USA

[2] MIT, Dept Math, Cambridge, MA 02139 USA

[3] Harvard Univ, Rowland Inst, Cambridge, MA 02142 USA

[4] Harvard Univ, Dept Mol & Cellular Biol, Cambridge, MA 02138 USA

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 101卷 / 03期

关键词：

D O I：

10.1103/PhysRevLett.101.038102

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Cells swimming in confined environments are attracted by surfaces. We measure the steady-state distribution of smooth-swimming bacteria (Escherichia coli) between two glass plates. In agreement with earlier studies, we find a strong increase of the cell concentration at the boundaries. We demonstrate theoretically that hydrodynamic interactions of the swimming cells with solid surfaces lead to their reorientation in the direction parallel to the surfaces, as well as their attraction by the closest wall. A model is derived for the steady-state distribution of swimming cells, which compares favorably with our measurements. We exploit our data to estimate the flagellar propulsive force in swimming E. coli.

引用

页数：4

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