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首页> 外文期刊>Journal of Biomechanics >Effect of non-Newtonian fluid properties on bovine sperm motility
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Effect of non-Newtonian fluid properties on bovine sperm motility

机译：非牛顿流体性质对牛精子运动的影响

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The swimming process by which mammal spermatozoa progress towards an egg within the reproductive organs is important in achieving successful internal fertilization. The viscosity of oviductal mucus is more than two orders of magnitude greater than that of water, and oviductal mucus also has non-Newtonian properties. In this study, we experimentally observed sperm motion in fluids with various fluid rheological properties and investigated the influence of varying the viscosity and whether the fluid was Newtonian or non-Newtonian on the sperm motility. We selected polyvinylpyrrolidone and methylcellulose as solutes to create solutions with different rheological properties. We used the semen of Japanese cattle and investigated the following parameters: the sperm velocity, the straight-line velocity and the amplitude from the trajectory, and the beat frequency from the fragellar movement. In a Newtonian fluid environment, as the viscosity increased, the motility of the sperm decreased. However, in a non-Newtonian fluid, the straight-line velocity and beat frequency were significantly higher than in a Newtonian fluid with comparable viscosity. As a result, the linearity of the sperm movement increased. Additionally, increasing the viscosity brought about large changes in the sperm flagellar shape. At low viscosities, the entire flagellum moved in a curved flapping motion, whereas in the high-viscosity, only the tip of the flagellum flapped. These results suggest that the bovine sperm has evolved to swim toward the egg as quickly as possible in the actual oviduct fluid, which is a high-viscosity non-Newtonian fluid. (C) 2015 Elsevier Ltd. All rights reserved.
机译：哺乳动物精子向生殖器官内的卵子前进的游泳过程对于实现成功的内部受精很重要。输卵管粘液的粘度比水的粘度大两个数量级以上，输卵管粘液也具有非牛顿性。在这项研究中，我们通过实验观察了具有各种流变特性的流体中的精子运动，并研究了改变粘度以及流体是牛顿还是非牛顿对精子运动性的影响。我们选择聚乙烯吡咯烷酮和甲基纤维素作为溶质，以创建具有不同流变性的溶液。我们使用了日本牛的精液，并研究了以下参数：精子速度，直线速度和轨迹的振幅，以及虫运动的跳动频率。在牛顿流体环境中，随着粘度的增加，精子的运动力下降。但是，在非牛顿流体中，直线速度和拍频明显高于具有类似粘度的牛顿流体。结果，精子运动的线性增加。另外，增加粘度导致精子鞭毛形状发生较大变化。在低粘度下，整个鞭毛以弯曲的拍打运动运动，而在高粘度下，只有鞭毛的尖端拍打。这些结果表明，牛精子已经进化为在实际的输卵管液中尽快向卵游动，而输卵管液是一种高粘度的非牛顿流体。 （C）2015 Elsevier Ltd.保留所有权利。

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