Collapse of DNA in ac electric fields

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

doi:10.1103/PhysRevLett.106.248103

Collapse of DNA in ac electric fields

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

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26 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 language	English (US)
Article number	248103
Journal	Physical review letters
Volume	106
Issue number	24
DOIs	https://doi.org/10.1103/PhysRevLett.106.248103
State	Published - Jun 16 2011

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

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10.1103/PhysRevLett.106.248103

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AU - Reisner, Walter W.

AU - Staunton, Rory J.

AU - Ashan, Amir

AU - Austin, Robert H.

AU - Riehn, Robert

PY - 2011/6/16

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AB - 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.

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Collapse of DNA in ac electric fields

Abstract

All Science Journal Classification (ASJC) codes

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