Motion of Spermatozoa in Fluid Streams
Motion of Spermatozoa in Fluid Streams
复制标题
精子在流体中的运动
作者：
A. Roberts
人们普遍认为，当在细管中形成电流时，受制于在细管中运动的精子优先游向上游(它们表现出正的流变性)。Rothschild2已经证明，死亡精子的方向取决于局部速度梯度的方向(图1)；因为精子的头部在重力作用下比尾巴下沉得更快，所以水平管的下半部分的生物指向头部上游，而上半部分的生物指向头部下游。因此，完全不清楚为什么活精子平均倾向于逆流而上。
IT is generally accepted that spermatozoa constrained to move in a fine tube swim preferentially upstream (they exhibit positive rheotaxis) when a current is established in the tube1. Rothschild2 has shown that the orientation of dead sperm depends on the direction of the local velocity gradient (Fig. 1); because the head of the spermatozoon sinks more rapidly than the tail under gravity, organisms in the bottom half of a horizontal tube point head upstream while those in the top half point head downstream. Thus it was not at all clear why live spermatozoa should tend on average to swim upstream2.