Scaling theory of DNA confined in nanochannels and nanoslits

Abstract

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.

5 pages, 1 figure Several corrections, some minor changes in the text and replacement of one reference

References in corpus (3)

• DNA Confined in Nanochannels: Hairpin Tightening by Entropic Depletion
• Conformations of confined biopolymers
• Comment on `Nanoconfinement-enhanced conformational response of single DNA molecules to changes in ionic environment'

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• Free Energy of a Knotted Polymer Confined to Narrow Cylindrical and Conical Channels
• Compression of a confined semiflexible polymer under direct and oscillating fields
• On the confinement of semiflexible chains under torsion
• External field influence on semiflexible macromolecules: geometric coupling