Thermal diffusion of high polymers in a continuous medium is independent of the molecular weight Mw. Accounting for the solvent molecular structure and the Brownian motion of the solute, we derive an additional contribution of opposite sign which is significant for short chains but vanishes as Mw-->infinity. Our findings explain the dependence on Mw observed recently for polystyrene, and its in...

Fluorescence microphotolysis (photobleaching) was used to measure, in single polyethylene glycol-induced polykaryons of hepatoma tissue culture cells, nucleocytoplasmic flux and intracellular mobility for a series of dextrans ranging in molecular mass from 3 to 150 kD and for bovine serum albumin. For the dextrans, the cytoplasmic and the nucleoplasmic translational diffusion coefficients amoun...

In this paper a computational study of the ethane diffusion in AlPO4-5 molecular sieve by classical molecular dynamics techniques is presented. Calculations were performed at different temperatures and loading of ethane molecules per AlPO4-5 unit cell. Static and dynamics AlPO4-5 framework conditions in the calculations were analyzed. According to the results of the simulations the molecular di...