论文标题
没有液晶级的活性液滴的自我促进
Self-propulsion of active droplets without liquid-crystalline order
论文作者
论文摘要
在细胞质内没有远程液晶阶的情况下，可以出现远离任何边界的细胞游泳，但缺乏这种效果的简单模型。在这里，我们提出了涉及两个标量场的液滴自我螺旋形的二维模型，该模型代表了细胞质和收缩皮层。这些磁场之间的耦合引起了主动应力。当旋转对称性自发断裂时，会产生自我推测。预测游泳速度，并以数值为单位显示与活动参数和液滴面积分数线性变化。该模型表现出类似于劳利的不稳定，用于一系列活跃的液滴。
The swimming of cells, far from any boundary, can arise in the absence of long-range liquid-crystalline order within the cytoplasm, but simple models of this effect are lacking. Here we present a two-dimensional model of droplet self-propulsion involving two scalar fields, representing the cytoplasm and a contractile cortex. An active stress results from coupling between these fields; self-propulsion results when rotational symmetry is spontaneously broken. The swimming speed is predicted, and shown numerically, to vary linearly with the activity parameter and with the droplet area fraction. The model exhibits a Crowley-like instability for an array of active droplets.
