摘要翻译:
我们考虑一个刚性的聚合物链在不良溶剂中,在链的一端施加一个力。我们发现,随着刚度参数的变化,聚合物经历了从球状态到类折叠态的转变。折叠态的构象类似于titin分子中的$\beta$-sheet。利用精确计数技术,我们研究了这类系统的伸长-力图和力-温度图。力-温度图显示了柔性链的再入口行为。然而,对于刚性链,这种再入行为是不存在的,并且随着刚性链的增加,θ-温度有增强的趋势。我们进一步提出,聚合物冻结结构的内在信息可以从端到端距离的分布中读出,这种分布表现出锯齿状的行为。
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英文标题:
《Force induced conformational transition in a system of interacting stiff
polymer: Application to unfolding》
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作者:
Sanjay Kumar and Debaprasad Giri
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最新提交年份:
2007
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分类信息:
一级分类:Physics 物理学
二级分类:Soft Condensed Matter 软凝聚态物质
分类描述:Membranes, polymers, liquid crystals, glasses, colloids, granular matter
膜,聚合物,液晶,玻璃,胶体,颗粒物质
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一级分类:Physics 物理学
二级分类:Statistical Mechanics 统计力学
分类描述:Phase transitions, thermodynamics, field theory, non-equilibrium phenomena, renormalization group and scaling, integrable models, turbulence
相变,热力学,场论,非平衡现象,重整化群和标度,可积模型,湍流
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一级分类:Physics 物理学
二级分类:Biological Physics 生物物理学
分类描述:Molecular biophysics, cellular biophysics, neurological biophysics, membrane biophysics, single-molecule biophysics, ecological biophysics, quantum phenomena in biological systems (quantum biophysics), theoretical biophysics, molecular dynamics/modeling and simulation, game theory, biomechanics, bioinformatics, microorganisms, virology, evolution, biophysical methods.
分子生物物理、细胞生物物理、神经生物物理、膜生物物理、单分子生物物理、生态生物物理、生物系统中的量子现象(量子生物物理)、理论生物物理、分子动力学/建模与模拟、博弈论、生物力学、生物信息学、微生物、病毒学、进化论、生物物理方法。
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英文摘要:
We consider a stiff polymer chain in poor solvent and apply a force at one end of the chain. We find that by varying the stiffness parameter, polymer undergoes a transition from the globule state to the folded like state. The conformation of folded state mimics the $\beta$-sheet as seen in titin molecule. Using exact enumeration technique, we study the extension-force and force-temperature diagrams of such a system. Force-temperature diagram shows the re-entrance behaviour for flexible chain. However, for stiff chain this re-entrance behaviour is absent and there is an enhancement in $\theta$-temperature with the rise of stiffness. We further propose that the internal information about the frozen structure of polymer can be read from the distribution of end-to-end distance which shows saw-tooth like behaviour.
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PDF链接:
https://arxiv.org/pdf/704.3172