草履虫在毛细管中游动
Paramecium swimming in capillary tube
摘要：
在自然栖息地中的游泳生物通过各种几何形状和化学环境导航。与边界的相互作用是无处不在的，可以显着修改在理想条件下观察到的生物体的游泳特性。研究了多微核草履虫纤毛运动的动力学，观察了固体边界对近场速度的影响。实验观察表明，草履虫执行的螺旋轨迹，慢慢过渡到直线运动的毛细管的直径减小。从理论上讲，该系统被建模为一个起伏的圆柱体的压力梯度和实验相比，显示出这样的考虑是必要的有限大小的生物体在限制性的几何形状建模。
英文摘要：
Swimming organisms in their natural habitat navigate through a wide array of geometries and chemical environments. Interaction with the boundaries is ubiquitous and can significantly modify the swimming characteristics of the organism as observed under ideal conditions. We study the dynamics of ciliary locomotion in Paramecium multimicronucleatum and observe the effect of the solid boundaries on the velocities in the near field of the organism. Experimental observations show that Paramecium executes helical trajectories that slowly transition to straight line motion as the diameter of the capillary tubes decrease. Theoretically this system is modeled as an undulating cylinder with pressure gradient and compared with experiments; showing that such considerations are necessary for modeling finite sized organisms in the restrictive geometries.
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