Swimming with an Image
Swimming with an Image
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DOI：
10.1103/physrevlett.106.038101
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发表时间：
2011-01-19
影响因子：
8.6
通讯作者：
Iebba, V.
中科院分区：
文献类型：
--
作者：
Di Leonardo, R.;Dell'Arciprete, D.;Iebba, V.
游动的细菌与邻近表面的流体动力学相互作用会使它绕圈游动。例如，当大肠杆菌在固体表面上时，它被观察到以顺时针方向游动。相比之下，我们观察到，当在液气界面附近游泳时，旋转感是相反的。我们通过细菌与它自己的镜像在完美滑动边界的对面游泳的流体动力学相互作用来定量地解释这一点。对于较长的细胞，耦合强度降低，其中扭矩分布在较大的长度上，导致较长的细菌在较大的圆圈中游泳。我们通过对细菌轨迹和方向的精确视频测量来证实这一点。
The hydrodynamic interactions of a swimming bacterium with a neighboring surface can cause it to swim in circles. For example, when E. coli is above a solid surface it had been observed to swim in a clockwise direction. By contrast we observe that, when swimming near a liquid-air interface, the sense of rotation is reversed. We quantitatively account for this through the hydrodynamic interaction of the bacterium with its own mirror image swimming on the opposite side of a perfect-slip boundary. The strength of the coupling is reduced for longer cells, where the torque is spread over a larger length, resulting in longer bacteria swimming in larger circles. We confirm this through precise video measurements of bacterial trajectories and orientations.