Collapse of DNA under alternating electric fields.

Collapse of DNA under alternating electric fields.
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DNA 在交变电场下的塌陷。

DOI:
10.1103/physreve.92.012714
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发表时间:
2015
期刊:
Physical review. E, Statistical, nonlinear, and soft matter physics
影响因子:
--
通讯作者:
Riehn,Robert
Riehn,Robert
中科院分区:
--
文献类型:
--
作者:
Zhou,Chunda;Riehn,Robert

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Recent studies have shown that double-stranded DNA can collapse in the presence of a strong electric field. Here we provide an in-depth study of the collapse of DNA under weak confinement in microchannels as a function of buffer strength, driving frequency, applied electric-field strength, and molecule size. We find that the critical electric field at which DNA molecules collapse (tens of kV/m) is strongly dependent on driving frequency (100–800 Hz) and molecular size (20–160 kbp), and weakly dependent on the ionic strength (8–60 mM). We argue that an apparent stretching at very high electric fields is an artifact of the finite frame time of video microscopy.
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