Unexpected bipolar flagellar arrangements and long-range flows driven by bacteria near solid boundaries.
Unexpected bipolar flagellar arrangements and long-range flows driven by bacteria near solid boundaries.
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DOI：
10.1103/physrevlett.101.168102
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发表时间：
2008-10
影响因子：
8.6
通讯作者：
L. Cisneros;J. Kessler;Ricardo Ortiz;R. Cortez;M. Bees
中科院分区：
文献类型：
--
作者：
L. Cisneros;J. Kessler;Ricardo Ortiz;R. Cortez;M. Bees
实验和数学建模表明，复杂的流动驱动的意想不到的鞭毛安排时，诱导围毛鞭毛细菌被限制在一个薄层的流体，不对称的边界之间。鞭毛显然形成了一个动态的双极组件，而不是自由游动细菌的单束特征，并观察到产生的流动围绕细胞体循环。它的范围超过几个细胞直径，与自由泳者周围的小范围流动形成对比。结果还表明，鞭毛束上的细菌，躺在固体基板上的单位有一个有效的旋转速度慢于“自由”鞭毛。这一发现扩展了我们对细菌及其鞭毛的动态几何结构的认识，并揭示了与运动相关的分子运输和细胞间通讯的新机制。
Experiments and mathematical modeling show that complex flows driven by unexpected flagellar arrangements are induced when peritrichously flagellated bacteria are confined in a thin layer of fluid, between asymmetric boundaries. The flagella apparently form a dynamic bipolar assembly rather than the single bundle characteristic of free swimming bacteria, and the resulting flow is observed to circulate around the cell body. It ranges over several cell diameters, in contrast to the small extent of the flows surrounding free swimmers. Results also suggest that flagellar bundles on bacteria that lie flat on a solid substrate have an effective rotation rate slower than "free" flagella. This discovery extends our knowledge of the dynamic geometry of bacteria and their flagella, and reveals new mechanisms for motility-associated molecular transport and intercellular communication.