Statistical properties of a tangentially driven active filament

Statistical properties of a tangentially driven active filament
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切向驱动的有源灯丝的统计特性

DOI:
10.1088/1742-5468/ab6097
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发表时间:
2020
期刊:
Journal of Statistical Mechanics: Theory and Experiment
影响因子:
--
通讯作者:
Baskaran, Aparna
Baskaran, Aparna
中科院分区:
--
文献类型:
--
作者:
Peterson, Matthew S;Hagan, Michael F;Baskaran, Aparna

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活性聚合物在许多生物系统中起着核心作用,从细菌鞭毛到细胞骨架。半柔性活性细丝的最小模型已被用于研究活性系统中各种有趣的现象,如活性向列数学中的缺陷动力学,运动分析中的聚类和规划,以及真核细胞中染色质的构象特性。在本文中,我们将半柔性聚合物映射到精确可解的活性劳斯链上,使我们能够解析计算具有任意刚性的活性聚合物的构型和动力学性质。在映射回半柔性丝后,我们看到质心扩散系数随活性参数线性增长,活性参数被聚合物持续长度重新规范化。这些结果与微观模拟得到的数值数据非常吻合。
Active polymers play a central role in many biological systems, from bacterial flagella to cellular cytoskeletons. Minimal models of semiflexible active filaments have been used to study a variety of interesting phenomena in active systems, such as defect dynamics in active nematics, clustering and laning in motility assays, and conformational properties of chromatin in eukaryotic cells. In this paper, we map a semiflexible polymer to an exactly solvable active Rouse chain, which enables us to analytically compute configurational and dynamical properties of active polymers with arbitrary rigidity. Upon mapping back to the semiflexible filament, we see that the center of mass diffusion coefficient grows linearly with an activity parameter that is renormalized by the polymer persistence length. These results closely agree with numerical data obtained from microscopic simulations.
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