DNA在纳米通道和纳米狭缝中的标度理论
Scaling theory of DNA confined in nanochannels and nanoslits
摘要：
对长DNA在纳米通道和纳米缝中的统计特性进行了标度分析。有人认为，有几个制度之间的de Gennes和Odijk的限制很久以前介绍。DNA链折叠回自身，从而产生全局持久长度，由于熵偏转，全局持久长度可能非常大。此外，有一个取向之间的排斥体积效应的DNA片段施加单独的纳米约束。这两个影响导致链统计是复杂的，导致非平凡的幂律的链延伸在中间政权。需要强调的是，纳米通道内的DNA限制与纳米缝中的DNA限制不同，因为各自的取向排斥体积效应不相同。
英文摘要：
A scaling analysis is presented of the statistics of long DNA confined in nanochannels and nanoslits. It is argued that there are several regimes in between the de Gennes and Odijk limits introduced long ago. The DNA chain folds back on itself giving rise to a global persistence length which may be very large owing to entropic deflection. Moreover, there is an orientational excluded-volume effect between the DNA segments imposed solely by the nanoconfinement. These two effects cause the chain statistics to be intricate leading to nontrivial power laws for the chain extension in the intermediate regimes. It is stressed that DNA confinement within nanochannels differs from that in nanoslits because the respective orientational excluded-volume effects are not the same.
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