Relaxation of stretched DNA in slitlike confinement

被引：65
|
作者：
Balducci, A. [1 ]
Hsieh, C. -C. [1 ]
Doyle, P. S. [1 ]
机构：
[1] MIT, Cambridge, MA 02139 USA
来源：
PHYSICAL REVIEW LETTERS | 2007年 / 99卷 / 23期
关键词：
D O I：
10.1103/PhysRevLett.99.238102
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We experimentally observe two separate time scales governing the entropic recoil in the linear force-extension regime of single double-stranded DNA in slit confinement. We demonstrate the existence of two distinct relaxation regimes at different extensions during relaxation. Contrary to bulk measurements, the true longest relaxation time may only be probed very close to equilibrium. A simple model of the relaxation mechanism leads to a scaling analysis that correctly predicts the extension at the crossover between the two regimes.
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页数：4
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