天津大学学报（英文版）
天津大學學報（英文版）
천진대학학보（영문판）
TRANSACTIONS OF TIANJIN UNIVERSITY
2015年
3期
223-227
,共5页
王永昭%张琪昌%王炜%韩建鑫
王永昭%張琪昌%王煒%韓建鑫
왕영소%장기창%왕위%한건흠
interfacial energy%static Kirchhoff's equations%helical configuration%ionic concentration%B-DNA to Z-DNA transition
The Kirchhoff thin elastic rod models are always the important basis to explore the configuration mecha-nism of the flexible structures in both the macroscopic and microscopic scale. As a continuum model of DNA, a thin elastic rod subjected to interfacial interactions is used to investigate the helical equilibrium configuration of DNA in salt solution. In this paper, the Kirchhoff's equations in the presence of interfacial traction and the free energy density functions of different configurations are studied. The transition formula of the free energy between B-DNA and Z-DNA is obtained, and the results show that the free energy of the transition is mainly determined by the salt concentra-tion, which agrees well with the experimental data.
