Conformation of circular DNA in two dimensions.
Conformation of circular DNA in two dimensions.
复制标题
DOI：
10.1103/physrevlett.101.148103
复制
发表时间：
2008-06
影响因子：
8.6
通讯作者：
Guillaume Witz;K. Rechendorff;J. Adamcik;G. Dietler
中科院分区：
文献类型：
--
作者：
Guillaume Witz;K. Rechendorff;J. Adamcik;G. Dietler
研究了不同长度的环状DNA分子在云母表面上的二维吸附构象。结果证实了如下猜想：临界指数nu是拓扑不变的并且等于自回避行走值（在本例中nu=3/4），并且系统的拓扑和维数强烈影响在尺度L约为7 l {p}处刚性区域和自回避区域之间的交叉.此外，键相关函数与预测的分子长度L成比例。对于分子长度L<或=5l{p}，环状DNA表现得像具有近似椭圆形状的刚性分子。
The conformation of circular DNA molecules of various lengths adsorbed in a 2D conformation on a mica surface is studied. The results confirm the conjecture that the critical exponent nu is topologically invariant and equal to the self-avoiding walk value (in the present case nu=3/4), and that the topology and dimensionality of the system strongly influence the crossover between the rigid regime and the self-avoiding regime at a scale L approximately 7l{p}. Additionally, the bond correlation function scales with the molecular length L as predicted. For molecular lengths L<or=5l{p}, circular DNA behaves like a stiff molecule with an approximately elliptic shape.