Swimming of peritrichous bacteria is enabled by an elastohydrodynamic instability.
Swimming of peritrichous bacteria is enabled by an elastohydrodynamic instability.
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DOI：
10.1038/s41598-018-28319-8
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发表时间：
2018-07-16
影响因子：
4.6
通讯作者：
Lauga E
中科院分区：
文献类型：
--
作者：
Riley EE;Das D;Lauga E
周鞭毛细菌，例如大肠杆菌，通过使用专门的电机旋转多个螺旋丝在液体中自我推进。每个马达的旋转被传递到一个称为钩的短柔性部分，钩又将其传递到鞭毛丝，使整个细胞能够游泳。由于多个马达在空间上分布在生物体上，人们预计细丝的推进力会相互推动，从而导致游泳的程度可以忽略不计。我们结合计算和理论来表明，周毛细菌的游泳是通过比临界阈值更灵活的钩子发生的弹性流体动力学弯曲不稳定性来实现的。通过过去对钩弯曲刚度的测量，我们证明了真正的细菌如何安全地站在促进系统游泳的不稳定性一侧。
Peritrichously-flagellated bacteria, such as Escherichia coli, self-propel in fluids by using specialised motors to rotate multiple helical filaments. The rotation of each motor is transmitted to a short flexible segment called the hook which in turn transmits it to a flagellar filament, enabling swimming of the whole cell. Since multiple motors are spatially distributed on the body of the organism, one would expect the propulsive forces from the filaments to push against each other leading to negligible swimming. We use a combination of computations and theory to show that the swimming of peritrichous bacteria is enabled by an elastohydrodynamic bending instability occurring for hooks more flexible than a critical threshold. Using past measurements of hook bending stiffness, we demonstrate how real bacteria are safely on the side of the instability that promotes systematic swimming.
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影响因子：
3.7
作者：
Hyon, Yunkyong;Marcos;Fu, Henry C.
通讯作者：
Fu, Henry C.
影响因子：
3.7
作者：
JOHNSON, RE
通讯作者：
JOHNSON, RE
影响因子：
3.2
作者：
Scharf, B
通讯作者：
Scharf, B
影响因子：
4.6
作者：
Shum, H.;Gaffney, E. A.
通讯作者：
Gaffney, E. A.
影响因子：
0.9
作者：
PURCELL, EM
通讯作者：
PURCELL, EM