Fluctuations and rheology in active bacterial suspensions

被引：133

作者：

Chen, D. T. N. ^{[1
]}

Lau, A. W. C.

Hough, L. A.

Islam, M. F.

Goulian, M.

Lubensky, T. C.

Yodh, A. G.

机构：

[1] Univ Penn, Dept Phys & Astron, Philadelphia, PA 19104 USA

[2] Florida Atlantic Univ, Dept Phys, Boca Raton, FL 33431 USA

来源：

PHYSICAL REVIEW LETTERS | 2007年 / 99卷 / 14期

关键词：

D O I：

10.1103/PhysRevLett.99.148302

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We probe nonequilibrium properties of an active bacterial bath through measurements of correlations of passive tracer particles and the response function of a driven, optically trapped tracer. These measurements demonstrate violation of the fluctuation-dissipation theorem and enable us to extract the power spectrum of the active stress fluctuations. In some cases, we observe 1/root omega scaling in the noise spectrum which we show can be derived from a theoretical model incorporating coupled stress, orientation, and concentration fluctuations of the bacteria.

引用

页数：4

共 30 条

[1] Hydrodynamics of isotropic and liquid crystalline active polymer solutions [J].

Ahmadi, Aphrodite ;

Marchetti, M. C. ;

Liverpool, T. B. .

PHYSICAL REVIEW E, 2006, 74 (06)

[2] Response regulator output in bacterial chemotaxis [J].

Alon, U ;

Camarena, L ;

Surette, MG ;

Arcas, BAY ;

Liu, Y ;

Leibler, S ;

Stock, JB .

EMBO JOURNAL, 1998, 17 (15) :4238-4248

[3]

[Anonymous], E COLI MOTION

[4] Cytoskeletal remodelling and slow dynamics in the living cell [J].

Bursac, P ;

Lenormand, G ;

Fabry, B ;

Oliver, M ;

Weitz, DA ;

Viasnoff, V ;

Butler, JP ;

Fredberg, JJ .

NATURE MATERIALS, 2005, 4 (07) :557-561

[5] Simple model for active nematics:: Quasi-long-range order and giant fluctuations [J].

Chaté, H ;

Ginelli, F ;

Montagne, R .

PHYSICAL REVIEW LETTERS, 2006, 96 (18)

[6] Rheological microscopy: Local mechanical properties from microrheology [J].

Chen, DT ;

Weeks, ER ;

Crocker, JC ;

Islam, MF ;

Verma, R ;

Gruber, J ;

Levine, AJ ;

Lubensky, TC ;

Yodh, AG .

PHYSICAL REVIEW LETTERS, 2003, 90 (10) :4

[7] Two-point microrheology of inhomogeneous soft materials [J].

Crocker, JC ;

Valentine, MT ;

Weeks, ER ;

Gisler, T ;

Kaplan, PD ;

Yodh, AG ;

Weitz, DA .

PHYSICAL REVIEW LETTERS, 2000, 85 (04) :888-891

[8] Self-concentration and large-scale coherence in bacterial dynamics [J].

Dombrowski, C ;

Cisneros, L ;

Chatkaew, S ;

Goldstein, RE ;

Kessler, JO .

PHYSICAL REVIEW LETTERS, 2004, 93 (09) :098103-1

[9] Scaling the microrheology of living cells [J].

Fabry, B ;

Maksym, GN ;

Butler, JP ;

Glogauer, M ;

Navajas, D ;

Fredberg, JJ .

PHYSICAL REVIEW LETTERS, 2001, 87 (14) :148102/1-148102/4

[10] Moving and staying together without a leader [J].

Grégoire, G ;

Chaté, H ;

Tu, YH .

PHYSICA D-NONLINEAR PHENOMENA, 2003, 181 (3-4) :157-170

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