Sentence examples for motion of sperm from inspiring English sources

This rough estimate based on the Brownian motion of sperm gives a correct order of magnitude, suggesting that the uterus might create the condition of sufficient randomness.

Second, the uterus is far from being a homogenous environment and it is not clear how the structure of the endometrium affects the motion of sperm cells.

Our measurements show that the interplay of fluid shear, steric surface-interactions, and chirality of the flagellar beat leads to stable upstream spiralling motion of sperm cells, thus providing a generic and robust rectification mechanism to support mammalian fertilisation.

The noise was not derived from the Brownian motion of sperm heads, but from the accuracy with which we calculated the brightness centroids of sperm head images using an image analyzing software (Bohboh Soft, Tokyo, Japan).

First, the motion of sperm cells in the uterus has to be tracked in vivo by new microscopy techniques that can reveal not only the type of spermatozoidal trajectory, but also its position in the uterus and the structure of the endometrium.

The large, circular motion of normal sperm is due to a high incidence of abaxial connections between the sperm head and neck [ 46].

Instead, the "sideways motion of the sperm's tail makes the head move sideways with a force that is ten times stronger than its forward movement…in fact, its strongest tendency, by tenfold, is to escape by attempting to pry itself off the egg" (Martin 1996: 108).

We suggest that these questions may be narrowed down to that of a search for a small target (the oocyte) by random motion of the sperm cells.

The model assumes that the effective two-dimensional motion of a sperm cell, that swims close to a surface in the presence of a shear flow can be described in terms of its position vector R (t) = (X t), Y t)) and its orientation unit vector N (t) = (N x (t), N y (t)).

Evaluations of sperm motion in adult F1 males indicated no effect on the percentage of motile sperm; however, compromised forward motion at 2,000× was observed, including a significant increase in beat cross frequency (rate of crossing the average path trajectory) and decreases in straightness (linearity of the spatial average path) and linearity (linearity of the curvilinear trajectory).

A preliminary analysis of sperm motion characteristics over time, however, can be informative before undertaking more complex analyses.