Slow relaxation process in DNA

被引：34

作者：

Sokolov, AP

Grimm, H

Kisliuk, A

Dianoux, AJ

机构：

[1] Univ Akron, Dept Polymer Sci, Akron, OH 44325 USA

[2] Forschungszentrum Julich, Inst Festkorperforsch, D-52425 Julich, Germany

[3] Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France

来源：

JOURNAL OF BIOLOGICAL PHYSICS | 2001年 / 27卷 / 04期

基金：

美国国家卫生研究院;

关键词：

bio-polymers; dynamic transition; dynamics; influence of hydration; relaxation in bio-polymers;

D O I：

10.1023/A:1014228824104

中图分类号：

Q6 [生物物理学];

学科分类号：

071011 ;

摘要：

A dynamic transition at temperatures similar to200-230K is observed in many hydrated bio-polymers. It shows up as a sharp increase of the mean-squared atomic displacements above this temperature range. We present neutron scattering data of DNA at different levels of hydration. The analysis shows that the dynamic transition in DNA is related to a slow relaxation process in the MHz-GHz frequency range. This slow relaxation process is completely suppressed in the dry DNA sample where no dynamic transition was observed. The nature of the slow process is discussed. We ascribe it to a global relaxation of DNA molecule that involves cooperative motion of many base-pairs and backbone.

引用

页码：313 / 327

页数：15

共 25 条

[1] Molecular-dynamics simulation of a glassy polymer melt: Incoherent scattering function [J].