  Nonlinear solid friction between the gel matrix and DNA molecules inhibits
the motion of DNA during electrophoresis. We report enhanced mobility of the
DNA using external noise to alleviate the effect of solid friction. In presence
of noise, the mobility of 1 kbp DNA increases ~ 86% compared to the
conventional gel electrophoresis, whereas the increment is more than ~113 % for
6 kbp DNA. At low power of the noise, super Arrhenius kinetics suggest the
collective behavior of the activated motion of DNA molecules. Stochastic
simulation following modified Langevin equation with the asymmetric pore size
distribution of the agarose gel successfully predicts the mobility of DNA
molecules and estimates the huge frictional force at the DNA-gel matrix
interface.
