Correlation properties of collective motion in bacterial suspensions.
Correlation properties of collective motion in bacterial suspensions.
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DOI：
10.1088/1367-2630/15/10/105021
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发表时间：
2013-09
影响因子：
3.3
通讯作者：
Aranson IS
中科院分区：
文献类型：
--
作者：
Ryan SD;Sokolov A;Berlyand L;Aranson IS
细菌悬浮液中集体运动的研究近来引起了人们的极大兴趣。为了更好地理解非平凡的时空相关性出现在悬浮液中的游动细菌的集体游泳过程中，一个简单的模型：细菌被表示为力偶极子的大小，通过使用短程排斥电位，和形状。该模型强调两个基本机制：偶极流体动力学相互作用和短程细菌碰撞。使用直接粒子模拟验证了一个专门的实验，我们表明，改变游泳速度或浓度改变持续集体运动的时间尺度，与实验一致。此外，随着浓度和游泳速度的变化，集体状态下的相关长度几乎是恒定的，尽管增加每一个都会大大增加系统的能量输入。我们证明了粒子的形状是关键的集体效应的发病。此外，提出了新的实验结果，说明集体运动的发病与超声技术。这项工作阐明了细菌悬浮液中控制集体运动的各种物理机制之间的微妙平衡，并为其介观性质提供了重要的见解。
The study of collective motion in bacterial suspensions has been of significant recent interest. To better understand the non-trivial spatio-temporal correlations emerging in the course of collective swimming in suspensions of motile bacteria, a simple model is employed: a bacterium is represented as a force dipole with size, through the use of a short-range repelling potential, and shape. The model emphasizes two fundamental mechanisms: dipolar hydrodynamic interactions and short-range bacterial collisions. Using direct particle simulations validated by a dedicated experiment, we show that changing the swimming speed or concentration alters the time scale of sustained collective motion, consistent with experiment. Also, the correlation length in the collective state is almost constant as concentration and swimming speed change even though increasing each greatly increases the input of energy to the system. We demonstrate that the particle shape is critical for the onset of collective effects. In addition, new experimental results are presented illustrating the onset of collective motion with an ultrasound technique. This work exemplifies the delicate balance between various physical mechanisms governing collective motion in bacterial suspensions and provides important insights into its mesoscopic nature.
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影响因子：
2.4
作者：
Cisneros, Luis H.;Kessler, John O.;Goldstein, Raymond E.
通讯作者：
Goldstein, Raymond E.
影响因子：
2.4
作者：
Ryan, Shawn D.;Haines, Brian M.;Aranson, Igor S.
通讯作者：
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影响因子：
8.6
作者：
Sokolov, Andrey;Aranson, Igor S.;Goldstein, Raymond E.
通讯作者：
Goldstein, Raymond E.
影响因子：
4.6
作者：
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通讯作者：
Fitzgibbon, Sean R.
影响因子：
8.6
作者：
Underhill, Patrick T.;Hernandez-Ortiz, Juan P.;Graham, Michael D.
通讯作者：
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