折叠构型聚合物跨纳米孔的转位

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摘要翻译：
通过分析简单的离散随机模型，从理论上研究了折叠构型聚合物在膜孔中的输运。易位动力学被看作是两个事件的序列：折叠段通过通道的运动，随后是聚合物的线性部分。由于聚合物分子与孔之间的相互作用不同，折叠段和线性段的跃迁速率也不同。结果表明，对于较短的聚合物和弱外场，转位时间与折叠段长度有关，而对于较长的分子和较大的外场，转位时间变得单调。此外，在聚合物和孔隙之间有一个关键的相互作用，这将两个动态状态分开。对于较强的相互作用，折叠聚合物移动较慢，而对于较弱的相互作用，线性链易位最快。此外，我们的计算表明，折叠不会改变聚合物的易位标度性质。这些现象可以通过聚合物折叠链段和线性链段的易位距离和跃迁速率之间的相互作用来解释。将理论结果应用于固态纳米孔的实验易位分析。
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英文标题：
《Translocation of polymers with folded configurations across nanopores》
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作者：
Stanislav Kotsev and Anatoly B. Kolomeisky
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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：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：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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英文摘要：
  The transport of polymers with folded configurations across membrane pores is investigated theoretically by analyzing simple discrete stochastic models. The translocation dynamics is viewed as a sequence of two events: motion of the folded segment through the channel followed by the linear part of the polymer. The transition rates vary for the folded and linear segments because of different interactions between the polymer molecule and the pore. It is shown that the translocation time depends non-monotonously on the length of the folded segment for short polymers and weak external fields, while it becomes monotonous for long molecules and large fields. Also, there is a critical interaction between the polymers and the pore that separates two dynamic regimes. For stronger interactions the folded polymer moves slower, while for weaker interactions the linear chain translocation is the fastest. In addition, our calculations show that the folding does not change the translocation scaling properties of the polymer. These phenomena can be explained by the interplay between the translocation distances and transition rates for the folded and linear segments of the polymer. Theoretical results are applied for analysis of experimental translocations through solid-state nanopores.
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PDF链接：
https://arxiv.org/pdf/708.132

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关键词：聚合物 interactions Calculations Experimental interaction 折叠 相互作用 状态 two 结果