Collapse of DNA in ac electric fields

Chunda Zhou, Walter W. Reisner, Rory J. Staunton, Amir Ashan, Robert H. Austin, Robert Riehn

Research output: Contribution to journalArticle

24 Scopus citations

Abstract

We report that double-stranded DNA collapses in the presence of ac electric fields at frequencies of a few hundred Hertz, and does not stretch as commonly assumed. In particular, we show that confinement-stretched DNA can collapse to about one quarter of its equilibrium length. We propose that this effect is based on finite relaxation times of the counterion cloud, and the subsequent partitioning of the molecule into mutually attractive units. We discuss alternative models of those attractive units.

Original languageEnglish (US)
Article number248103
JournalPhysical review letters
Volume106
Issue number24
DOIs
StatePublished - Jun 16 2011

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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