论文标题
手性细菌的风湿性：从单细胞行为到人群级别的描述
Rheotaxis of chiral bacteria: from single-cell behavior to a population-level description
论文作者
论文摘要
由于它们的形态，悬浮在培养基中的细菌的动力学会表现出复杂的行为。在存在剪切的情况下，游泳细菌经历了垂直于剪切平面的漂移。这种漂移称为类风湿，在这里进行了半分析，数字和实验研究。在存在旋转扩散的情况下，我们发现细菌取向和细菌速度对剪切速率的依赖性。这使我们能够表明，垂直于剪切的细菌的漂移速度主要是由于细菌推进，而不是类变性力。比较细菌的漂移速度和扩散导致péclet数的定义。风湿性效应随着剪切而增加，达到非常大的péclet数量达到平稳，与在微流体液滴中进行的风湿性实验非常吻合。
Due to their morphology, the dynamics of bacteria suspended in media can exhibit complex behaviors. In the presence of a shear, swimming bacteria experience a drift perpendicular to the shear plane. This drift, termed rheotaxis, is studied here semi-analytically, numerically and experimentally. We find the dependency of bacterial orientation and bacterial speed on the shear rate, in the presence of rotational diffusion. This enables us to show that the drift speed of bacteria perpendicular to the shear is predominantly due to bacterial propulsion, and not rheotactic forces. Comparing the drift speed of bacteria and diffusion leads to the definition of a Péclet number. The rheotactic effect increases with the shear, reaching a plateau at very large Péclet numbers, in good agreement with experiments of rheotaxis performed in microfluidic droplets.
