Undulatory microswimming near solid boundaries
Undulatory microswimming near solid boundaries
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DOI：
10.1063/1.4897651
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发表时间：
2014-10-01
影响因子：
4.6
通讯作者：
Dalnoki-Veress, K.
中科院分区：
文献类型：
--
作者：
Schulman, R. D.;Backholm, M.;Dalnoki-Veress, K.
研究了模式生物C.在接近固体边界的地方研究了秀丽线虫。使用微量移液管偏转技术，我们获得直接和时间分辨力测量的粘性力作用在蠕虫附近的一个单一的平面边界，以及限制在两个平面边界之间。我们观察到一个单调增加的侧向力和推进力的增加接近固体界面。我们确定正常和切向阻力系数的蠕虫，并发现这些限制增加。将测量的阻力系数与现有的理论模型进行比较。在离单个边界的所有距离上，法向阻力系数与切向阻力系数之比假定为1.5 +/- 0.1（5）的常数值，但当蜗杆被限制在两个边界之间时，其比值显著增大。为了响应由于限制而增加的阻力，我们观察到线虫的步态调制，其主要特征在于游泳幅度的减小。(C)2014 AIP Publishing LLC.
The hydrodynamic forces involved in the undulatory microswimming of the model organism C. elegans are studied in proximity to solid boundaries. Using a micropipette deflection technique, we attain direct and time-resolved force measurements of the viscous forces acting on the worm near a single planar boundary as well as confined between two planar boundaries. We observe a monotonic increase in the lateral and propulsive forces with increasing proximity to the solid interface. We determine normal and tangential drag coefficients for the worm, and find these to increase with confinement. The measured drag coefficients are compared to existing theoretical models. The ratio of normal to tangential drag coefficients is found to assume a constant value of 1.5 +/- 0.1(5) at all distances from a single boundary, but increases significantly as the worm is confined between two boundaries. In response to the increased drag due to confinement, we observe a gait modulation of the nematode, which is primarily characterized by a decrease in the swimming amplitude. (C) 2014 AIP Publishing LLC.