Flagella bending affects macroscopic properties of bacterial suspensions.
Flagella bending affects macroscopic properties of bacterial suspensions.
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鞭毛弯曲影响细菌悬浮液的宏观特性。
DOI：
10.1098/rsif.2016.1031
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Aranson,IS
中科院分区：
文献类型：
--
作者：
Potomkin,M;Tournus,M;Berlyand,LV;Aranson,IS
为了在恶劣的条件下生存，可移动的细菌在复杂的环境中游泳，并对周围的流动做出反应。在这里，我们开发了一个数学模型，描述鞭毛弯曲如何影响细菌悬浮液的宏观性质。首先，我们展示了鞭毛弯曲如何有助于在稀悬液中观察到的有效粘度的降低。我们的结果不会像以前用来解释粘度降低的方法那样施加翻滚(随机重定向)。其次，我们演示了细菌如何由于鞭毛的自我诱导弯曲而逃脱壁困。我们的结果揭示了灵活的细菌鞭毛在细菌与剪切流和墙壁或障碍物相互作用中的作用。
To survive in harsh conditions, motile bacteria swim in complex environments and respond to the surrounding flow. Here, we develop a mathematical model describing how flagella bending affects macroscopic properties of bacterial suspensions. First, we show how the flagella bending contributes to the decrease in the effective viscosity observed in dilute suspension. Our results do not impose tumbling (random reorientation) as was previously done to explain the viscosity reduction. Second, we demonstrate how a bacterium escapes from wall entrapment due to the self-induced buckling of flagella. Our results shed light on the role of flexible bacterial flagella in interactions of bacteria with shear flow and walls or obstacles.