Hexagonal → cholesteric phase transition of DNA molecules in liquid-crystalline dispersion particles

被引：0
|
作者：
Yu. M. Yevdokimov
S. G. Skuridin
V. I. Salyanov
E. I. Katz
机构：
[1] Russian Academy of Sciences,Engelgardt Institute of Molecular Biology
[2] Russian Academy of Sciences,Landau Institute of Theoretical Physics
来源：
Doklady Physical Chemistry | 2016年 / 467卷
关键词：
Circular Dichroism Spectrum; Dispersion Particle; DOKLADY Physical Chemistry; Aqueous Salt Solution; Hexagonal Packing;
D O I：
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中图分类号：
学科分类号：
摘要：
To assess the character of packing of double-stranded (ds) DNA molecules in liquid-crystalline dispersion particles formed by phase exclusion of DNA molecules from aqueous salt solutions of poly(ethylene glycol), the circular dichroism spectra of these dispersions at different temperatures have been compared. It has been shown for the first time that heating dispersion particles with the hexagonal packing of ds-DNA molecules is accompanied by the hexagonal → cholesteric phase transition. This result can be described using the notion of quasi-nematic layers composed of orientationally ordered adjacent ds-DNA molecules in the structure of dispersion particles; these layers can be packed in two ways dictating their hexagonal or cholesteric spatial structure.
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页码：53 / 55
页数：2
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