Flagellated bacteria swim in circles near a rigid wall
Flagellated bacteria swim in circles near a rigid wall
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DOI：
10.1103/physreve.100.063112
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发表时间：
2019-12-30
影响因子：
2.4
通讯作者：
Lim, Sookkyung
中科院分区：
文献类型：
--
作者：
Park, Yunyoung;Kim, Yongsam;Lim, Sookkyung
细菌鞭毛的旋转由旋转马达驱动，使细胞能够在液体中游动。细菌通过改变马达的旋转方向来奔跑和重新定向以生存。流体环境条件也会改变游泳的过程；例如，靠近实体边界的单元格绘制圆形轨迹，而不是直线轨迹。我们提出了一个细菌模型，一个鞭毛附着在细胞体上，并研究了固体壁对细菌运动的影响。细菌的细胞体被认为是一个刚体，并通过旋转马达与基尔霍夫杆理论模拟的弹性鞭毛相连。利用正则Stokes公式结合图像系统描述了靠近固体边界的胞体的水动力相互作用。我们表明，细菌在固体边界附近的运动轨迹受到电机转速、细胞体形状、螺旋几何形状和鞭毛弹性特性的影响。
The rotation of bacterial flagella driven by rotary motors enables the cell to swim through fluid. Bacteria run and reorient by changing the rotational direction of the motor for survival. Fluid environmental conditions also change the course of swimming; for example, cells near a solid boundary draw circular trajectories rather than straight runs. We present a bacterium model with a single flagellum that is attached to the cell body and investigate the effect of the solid wall on bacterial locomotion. The cell body of the bacterium is considered to be a rigid body and is linked via a rotary motor to the elastic flagellum which is modeled by the Kirchhoff rod theory. The hydrodynamic interaction of the cell near a solid boundary is described using the regularized Stokes formulation combined with the image system. We show that the trajectories of the bacteria near a solid boundary are influenced by the rotation rate of the motor, the shape of the cell body, helical geometry, and elastic properties of the flagellum.