Mechanical response of active gels
Mechanical response of active gels
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DOI：
10.1209/0295-5075/85/18007
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发表时间：
2009-01-01
期刊：
影响因子：
1.8
通讯作者：
Prost, J.
中科院分区：
文献类型：
--
作者：
Liverpool, T. B.;Marchetti, M. C.;Prost, J.
我们研究了一个模型的活性凝胶的交联半柔性丝与其他活性接头，如肌球蛋白II簇。我们表明，耦合的半柔性长丝的机械性能的电机的弹性导致收缩行为的凝胶，定性与实验观察。然而，马达软化了凝胶的零频率弹性常数。当集体电动机动力学被纳入模型中时，获得了在高频率下的网络硬化。控制低频和高频网络弹性之间的交叉的频率根据马达和细丝的微观特性来估计，并且可以低至10（-3）Hz。版权所有（C）EPLA，2009
We study a model of an active gel of cross-linked semiflexible filaments with additional active linkers such as myosin II clusters. We show that the coupling of the elasticity of the semiflexible filaments to the mechanical properties of the motors leads to contractile behavior of the gel, in qualitative agreement with experimental observations. The motors, however, soften the zero-frequency elastic constant of the gel. When the collective motor dynamics is incorporated in the model, a stiffening of the network at high frequencies is obtained. The frequency controlling the crossover between low-and high-frequency network elasticity is estimated in terms of microscopic properties of motors and filaments, and can be as low as 10(-3) Hz. Copyright (C) EPLA, 2009