Journal
SOFT MATTER
Volume 6, Issue 2, Pages 243-246Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b917973a
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Funding
- National Institutes of Health [R01-HG003713, PHS 5 P41-RR05969]
- National Science Foundation [PHY0822613]
- Petroleum Research Fund [48352-G6]
- Texas Advanced Computing Center [MCA05S028]
- NATIONAL HUMAN GENOME RESEARCH INSTITUTE [R01HG003713] Funding Source: NIH RePORTER
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Counterion-induced inversion of the DNA charge was characterized through extensive molecular dynamics simulations. We observed reversal of the DNA motion in an external electric field upon increasing the concentration of trivalent or quadrivalent counterions. In the case of a divalent electrolyte, inversion of the DNA's electric charge was observed at high concentrations of the electrolyte but not reversal of the DNA's electrophoretic motion. We demonstrate that inversion of the electrophoretic mobility of the DNA results from a complex interplay of electrostatics and hydrodynamics.
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