The multiplicity of "re-entrant" cholesteric structures in the DNA liquid-crystalline dispersions
E.I. Katsc aEngelhardt Institute of Molecular Biology Russian Academy of Sciences, Vavilov str. 32, Moscow, 119991, Russian Federation bNational Research Centre ‘Kurchatov Institute’, pl. akad. Kurchatova 1, Moscow, 123182, Russian Federation cL.D. Landau Institute for Theoretical Physics, Russian Academy of Sciences, Chernogolovka, Moscow Region, Russian Federation
The results of studies of the liquid-crystalline dispersions of DNA molecules formed upon phase exclusion of these molecules are systematized. In the framework of the concept of the "quasinematic" layers of orientationally ordered DNA molecules in dispersion particles, the influence of temperature and osmotic pressure on the particle structure is determined. The detected by us a new phase transition "hexagonal —> "re-" cholesteric packing" of DNA molecules, is described taking into account the generalized Lindemann's criterion. The multiplicity of the "re-entrant" phases and their structures depend on the characteristics of DNA and water-polymer solution.
Keywords: DNA, liquid-crystalline dispersions, circular dichroism, textures, intercalators, "re-entrant" phases, Lindemann criterion DOI:10.3367/UFNe.2020.09.038843 Citation: Yevdokimov Yu M, Skuridin S G, Salyanov V I, Semenov S V, Kats E I "The multiplicity of "re-entrant" cholesteric structures in the DNA liquid-crystalline dispersions" Phys. Usp., accepted
Received: 23rd, June 2020, revised: 22nd, July 2020, accepted: 28th, September 2020