Mechanical property of the helical configuration for a twisted intrinsically straight biopolymer

doi:10.1007/s00249-019-01357-4

淡江大學機構典藏 > 理學院 > 物理學系暨研究所 > 期刊論文 > Item 987654321/117121

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题名:	Mechanical property of the helical configuration for a twisted intrinsically straight biopolymer
作者:	Wu, Zicong Zhou and Chen-Xu
关键词:	Mechanical property;Twisted biopolymer;Helix;Phase transition
日期:	2019-05
上传时间:	2019-09-24 12:11:43 (UTC+8)
出版者:	Springer International Publishing
摘要:	We explore the effects of two typical torques on the mechanical property of the helical configuration for an intrinsically straight filament or biopolymer either in three-dimensional space or on a cylinder. One torque is parallel to the direction of a uniaxial applied force, and is coupled to the cross section of the filament. We obtain some algebraic equations for the helical configuration and find that the boundary conditions are crucial. In three-dimensional space, we show that the extension is always a monotonic function of the applied force. On the other hand, for a filament confined on a cylinder, the twisting rigidity and torque coupled to the cross section are irrelevant in forming a helix if the filament is isotropic and under free boundary condition. However, the twisting rigidity and the torque coupled to the cross section become crucial when the Euler angle at two ends of the filament are fixed. Particularly, the extension of a helix can subject to a first-order transition so that in such a condition a biopolymer can act as a switch or sensor in some biological processes. We also present several phase diagrams to provide the conditions to form a helix.
關聯:	European Biophysics Journal 48(4), p.329–340
DOI:	10.1007/s00249-019-01357-4
显示于类别:	[物理學系暨研究所] 期刊論文

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