Volume 68, Number 6, December 2004
|Page(s)||894 - 900|
|Section||Interdisciplinary physics and related areas of science and technology|
|Published online||12 November 2004|
DNA condensation, redissolution and mesocrystals induced by tetravalent counterions
Institut für Theoretische Physik II, Heinrich-Heine-Universität Düsseldorf D-40225 Düsseldorf, Germany
2 Institut für Festkörperforschung, Forschungszentrum Jülich D-52425 Jülich, Germany
3 Institute for High Temperatures, Russian Academy of Sciences Izhorskaya street 13/19, 127412 Moscow, Russia
Accepted: 14 October 2004
The distance-resolved effective interaction potential between two parallel DNA molecules is calculated by computer simulations with explicit tetravalent counterions and monovalent salt. Adding counterions first yields an attractive minimum in the potential at short distances which then disappears in favor of a shallower minimum at larger separations. The resulting phase diagram includes a DNA condensation and redissolution transition and a stable mesocrystal with an intermediate lattice constant for high counterion concentration.
PACS: 87.15.Kg – Molecular interactions; membrane-protein interactions / 61.20.Ja – Computer simulation of liquid structure / 82.70.Dd – Colloids
© EDP Sciences, 2004
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