The results of investigations of the properties of liquid-crystalline dispersions of DNA molecules formed in their phase exclusion are systematized. The influence of temperature and osmotic pressure on the structure of these molecules has been elucidated in the framework of the concept of 'quasinematc' layers of orientationally ordered DNA molecules in dispersed particles. A new hexagonal → 're-entrant' cholesteric packing phase transition of DNA molecules discovered by the authors is described, taking into account the generalized Lindemann criterion. The multiplicity of the 're-entrant' phases and their structure are shown to depend on the characteristics of DNA and water-polymer solutions.

Keywords: DNA, liquid-crystalline dispersions, circular dichroism, textures, intercalators, `re-entrant' phases, Lindemann criterion PACS: 61.30.Eb, 64.70.M−, 82.70.−y (all) DOI: 10.3367/UFNe.2020.09.038843 URL: https://ufn.ru/en/articles/2021/9/d/ 000722209600004 2-s2.0-85120777969 Citation: Yevdokimov Yu M, Skuridin S G, Salyanov V I, Semenov S V, Kats E I "Multiplicity of 're-entrant' cholesteric structures in DNA liquid-crystalline dispersions" Phys. Usp. 64 947–963 (2021) BibTexBibNote ® (generic)BibNote ® (RIS) MedlineRefWorks PT Journal Article TI Multiplicity of 're-entrant' cholesteric structures in DNA liquid-crystalline dispersions AU Yevdokimov Yu M FAU Yevdokimov YM AU Skuridin S G FAU Skuridin SG AU Salyanov V I FAU Salyanov VI AU Semenov S V FAU Semenov SV AU Kats E I FAU Kats EI DP 10 Sep, 2021 TA Phys. Usp. VI 64 IP 9 PG 947-963 RX 10.3367/UFNe.2020.09.038843 URL https://ufn.ru/en/articles/2021/9/d/ SO Phys. Usp. 2021 Sep 10;64(9):947-963 Received: 23rd, June 2020, revised: 22nd, July 2020, accepted: 28th, September 2020 Оригинал: Евдокимов Ю М, Скуридин С Г, Салянов В И, Семёнов С В, Кац Е И «Множественность "возвратных" холестерических структур в жидкокристаллических дисперсиях ДНК» УФН 191 999–1015 (2021); DOI: 10.3367/UFNr.2020.09.038843