DNA分子链电子结构特性研究  

Characteristics of the electronic structure of DNA sequence

作　　者：马松山[1] 徐慧[1] 刘小良[1] 郭爱敏[1] 

机构地区：[1]中南大学物理科学与技术学院,长沙410083

出　　处：《物理学报》2006年第6期3170-3174,共5页Acta Physica Sinica

基　　金：高等学校博士学科点专项科研基金(批准号:20020533001);湖南省自然科学基金(批准号:05JJ40135)资助的课题~~

摘　　要：在单电子紧束缚近似下,建立了一维无序二元DNA分子链模型,计算了链长为2×104个碱基对的DNA分子链的电子态密度、局域化特性,并探讨了碱基对的不同组分、格点能量无序度对电子局域态的影响.结果表明:由于DNA分子链中格点能量无序及碱基对的不同组分的存在,其电子波函数呈现出局域化的特性,而局域长度作为衡量电子局域化程度的一个尺度,受碱基对的组分及格点能量无序度的影响.Based on a tight-binding disordered model describing a single electron band, we establish a one-dimensional disordered binary DNA model, and calculate the density of electronic states, the localization property of electronic wave-function and the localization length of a DNA sequence with 2×10^4 nucleotide base pairs. We also investigate the effect of composition of nucleotide base pairs, the degree of disorder of the energy base pairs on the localization length. The results indicate that the electronic states of DNA sequence are localized due to the compositional disorder of nucleotide base pairs and the energy disorder of the lattices, and the localization length is dependent on the composition of nucleotide base pairs and the disorder degree of lattices energy.

关 键 词：DNA分子链 电子结构 电子局域态 局域长度 

分 类 号：Q523[生物学—生物化学]