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arXiv 1202.5633cond-mat.soft
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电场驱动的polymer进入非对称纳米尺度通道

Electric-field-driven polymer entry into asymmetric nanoscale channels

Narges Nikoofard, Hossein Fazli

摘要:

从理论上和分子动力学模拟研究了电场驱动下柔性带电聚合物如单链DNA(ssDNA)进入不对称纳米通道如α-溶血素蛋白质通道的过程.自由能垒的高度对聚合物的长度,所施加的电场的强度和通道入口的几何形状的依赖关系进行了研究。结果表明,驱动场对聚合物的压缩效应和聚合物进入通道前的横向限制对势垒高度及其对系统参数的依赖性有着至关重要的影响。还讨论了聚合物通过通道的尝试频率。我们的理论和模拟结果相互支持,并合理地描述了通过α-溶血素蛋白质通道的聚合物易位实验的相关数据集。

英文摘要:

The electric-field-driven entry process of flexible charged polymers such as single stranded DNA (ssDNA) into asymmetric nanoscale channels such as alpha-hemolysin protein channel is studied theoretically and using molecular dynamics simulations. Dependence of the height of the free-energy barrier on the polymer length, the strength of the applied electric field and the channel entrance geometry is investigated. It is shown that the squeezing effect of the driving field on the polymer and the lateral confinement of the polymer before its entry to the channel crucially affect the barrier height and its dependence on the system parameters. The attempt frequency of the polymer for passing the channel is also discussed. Our theoretical and simulation results support each other and describe related data sets of polymer translocation experiments through the alpha-hemolysin protein channel reasonably well.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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