Melting of columnar hexagonal DNA liquid crystals |
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| Authors: | K Kassapidou JRC van der Maarel |
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| Institution: | (1) Leiden Institute of Chemistry, Gorlaeus Laboratories, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands, NL |
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| Abstract: | The persistence length DNA hexagonal-cholesteric phase transition upon dilution and/or increase in solvent ionic strength
is investigated with polarized light microscopy. The ionic strength dependence of the transition follows Lindemann criterion
, i.e., the hexagonal lattice melts when the root-mean-square fluctuations in transverse order exceed 10% of the interaxial spacing.
The spacings are derived from density and the fluctuations are estimated with a theory of undulation enhanced electrostatic
interactions. Additional support for this theory is given by the DNA equation of state and anisotropic neutron radiation scattering
from magnetically aligned cholesteric samples just below the phase transition.
Received: 17 November 1997 / Revised: 21 January 1998 / Accepted: 25 February 1998 |
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| Keywords: | PACS 64 70 -p Specific phase transition - 61 25 -f Studies of specific liquid structures - 87 15 -v Molecular biophysics |
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