Nonmonotonic density dependence of the diffusion of DNA fragments in low-salt suspensions.
The high linear charge density of 20-base-pair oligomers of DNA is shown to lead to a striking nonmonotonic dependence of the long-time self-diffusion on the concentration of DNA in low-salt conditions. This generic nonmonotonic behavior results from the strong coupling between the electrostatic and solvent-mediated hydrodynamic interactions, from the renormalization of these electrostatic interactions at large separations, and specifically from the dominance of the far-field hydrodynamic interactions caused by the strong repulsion between the DNA fragments.
McPhie
Mathieu G
MG
Institut für Festkörperforschung, Forschungszentrum Jülich, D-52425 Jülich, Germany.
Nägele
Gerhard
G
D055592:Biophysical Phenomena; D003102:Colloids; D004247:DNA / Q000737:chemistry*; D004058:Diffusion; D008956:Models, Chemical; D012965:Sodium Chloride; D055672:Static Electricity
D003102:Colloids; D012965:Sodium Chloride; D004247:DNA