线性聚合物溶液中细菌游动速度随粘度增加的数学解释。
A mathematical explanation of an increase in bacterial swimming speed with viscosity in linear-polymer solutions.
作者信息
Magariyama Yukio, Kudo Seishi
机构信息
National Food Research Institute, Tsukuba 305-8642, Japan.
出版信息
Biophys J. 2002 Aug;83(2):733-9. doi: 10.1016/S0006-3495(02)75204-1.
Abstract
Bacterial swimming speed is sometimes known to increase with viscosity. This phenomenon is peculiar to bacterial motion. Berg and Turner (Nature. 278:349-351, 1979) indicated that the phenomenon was caused by a loose, quasi-rigid network formed by polymer molecules that were added to increase viscosity. We mathematically developed their concept by introducing two apparent viscosities and obtained results similar to the experimental data reported before. Addition of polymer improved the propulsion efficiency, which surpasses the decline in flagellar rotation rate, and the swimming speed increased with viscosity.
摘要
有时已知细菌的游动速度会随着黏度的增加而提高。这种现象是细菌运动所特有的。伯格和特纳（《自然》。278:349 - 351，1979年）指出，该现象是由添加以增加黏度的聚合物分子形成的松散、准刚性网络所导致的。我们通过引入两种表观黏度在数学上拓展了他们的概念，并得到了与之前报道的实验数据相似的结果。聚合物的添加提高了推进效率，这超过了鞭毛旋转速率的下降，并且游动速度随黏度增加。
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