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M Muthukumar

Publications and source records attributed to M Muthukumar.

9 recordsLinked to original sources
PubMed2001

Translocation of a confined polymer through a hole.

Based on an analogy between polymer translocation across a free energy barrier associated with polymer worming through a hole and classical nucleation and growth process, the escape time tau is predicted asymptotically to be N(N/rho)(1/3nu). N is the polymer length, rho is the monomer density prior to escape, and nu is the radius of gyration exponent. Monte Carlo simulation data collected in the high salt limit (nu approximately 3/5) are in agreement with the asymptotic law and provide vivid details of the escape.

DNA↗
PubMed1996

Theory of electrophoretic mobility of a polyelectrolyte in semidilute solutions of neutral polymers.

An explicit formula is derived for the electrophoretic mobility of a polyelectrolyte molecule in a semidilute solution of neutral polymers in terms of the molecular weight N of a polyelectrolyte, concentration c of neutral polymers, Debye length and solvent quality. The nature of the crossover between different regimes, as c, N, and the salt concentration are varied, is presented. The calculations show that one progressively enters into regimes of no-separation, separation, and no-separation in the electrophoresis of polyelectrolytes as c is increased. If c is very high, one returns to the mechanism of separation in gel electrophoresis.

Electrolytes↗