Continuity of States Between the Cholesteric → Line Hexatic Transition and the Condensation Transition in DNA Solutions

Overview

Journal Sci Rep

Specialty Science

Date 2014 Nov 6

PMID 25371012

Citations 10

Authors

Selcuk Yasar

Rudolf Podgornik

Jessica Valle-Orero

Mark R Johnson

V Adrian Parsegian

Affiliations

Soon will be listed here.

Abstract

A new method of finely temperature-tuning osmotic pressure allows one to identify the cholesteric → line hexatic transition of oriented or unoriented long-fragment DNA bundles in monovalent salt solutions as first order, with a small but finite volume discontinuity. This transition is similar to the osmotic pressure-induced expanded → condensed DNA transition in polyvalent salt solutions at small enough polyvalent salt concentrations. Therefore there exists a continuity of states between the two. This finding, together with the corresponding empirical equation of state, effectively relates the phase diagram of DNA solutions for monovalent salts to that for polyvalent salts and sheds some light on the complicated interactions between DNA molecules at high densities.

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