Collapse of DNA in ac electric fields.
Collapse of DNA in ac electric fields.
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DOI：
10.1103/physrevlett.106.248103
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发表时间：
2011-06-17
影响因子：
8.6
通讯作者：
Riehn R
中科院分区：
文献类型：
--
作者：
Zhou C;Reisner WW;Staunton RJ;Ashan A;Austin RH;Riehn R
我们报告说，双链DNA崩溃的存在下，a.c.电场的频率为几百赫兹，并且不像通常假设的那样伸展。特别是，我们表明，约束拉伸DNA可以崩溃到其平衡长度的四分之一左右。我们建议，这种效果是基于有限的松弛时间的countercloud，和随后的分区的分子相互吸引的单位。我们讨论这些有吸引力的单位的替代模型。
We report that double-stranded DNA collapses in presence of a.c. 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.