DNA-condensation, redissolution and mesocrystals induced by tetravalent counterions

Details DNA-condensation, redissolution and mesocrystals induced by tetravalent counterions DNA-condensation, redissolution and mesocrystals induced by tetravalent counterions

2004-05-06

arxiv.org/abs/cond-mat/0405109v1

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 4 figures

Scientific paper

10.1209/epl/i2004-10272-8

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.

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