Dynamics of a membrane coupled to an active fluid
Dynamics of a membrane coupled to an active fluid
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与活性流体耦合的膜的动力学
DOI：
10.1103/physreve.101.042601
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发表时间：
2020
影响因子：
2.4
通讯作者：
Chen Hsuan-Yi
中科院分区：
文献类型：
--
作者：
Liang Chia-Chun;Yasuda Kento;Komura Shigeyuki;Wu Kuo-An;Chen Hsuan-Yi
从理论上考虑了基底上与活性流体耦合的膜的动力学。假设主动流体的指向矢场在膜平面内具有旋转对称性。这种情况可能与体外重构的肌动球蛋白-膜系统有关。与耦合到极性活性流体的膜不同，该模型预测，仅当膜上方的流体的粘度足够大时，可收缩的活性流体才能够减缓膜对于与活性流体的厚度相当的波长的扰动的松弛。因此，我们的模型预测了强收缩极限下的有限波长不稳定性，这与耦合到极性活性流体的膜不同。然而，耦合到一个可伸展的活性流体的膜总是不稳定的对长波长的扰动，由于积极的可伸展应力增强膜起伏。
The dynamics of a membrane coupled to an active fluid on top of a substrate is considered theoretically. It is assumed that the director field of the active fluid has rotational symmetry in the membrane plane. This situation is likely to be relevant forin vitroreconstructed actomyosin-membrane system. Different from a membrane coupled to a polar active fluid, this model predicts that only when the viscosity of the fluid above the membrane is sufficiently large, a contractile active fluid is able to slow down the relaxation of the membrane for perturbations with wavelength comparable to the thickness of the active fluid. Hence, our model predicts a finite-wavelength instability in the limit of strong contractility, which is different from a membrane coupled to a polar active fluid. However, a membrane coupled to an extensile active fluid is always unstable against long-wavelength perturbations due to active extensile stress enhanced membrane undulation.