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Abstract
A model for pulsed-field electrophoresis was developed by picturing large DNA as a deformable "bag" that (i) moves with limiting mobility in a continuous electric field, (ii) adopts an orientation aligned with the field direction, and (iii) reorients after a change in field direction in a size-dependent manner. The model correctly predicted the resolution of large DNA in a pulsed field including the surprising phenomena of mobility inversion, lateral band spreading, and improved resolution for obtuse angles. A simple parametrization agreed with observations of two completely different aspects of DNA behavior: bulk mobility as measured during gel electrophoresis and molecular reorientation as measured by linear dichroism. The model also provides quantitative guidelines for setting experimental parameters in pulsed-field electrophoresis experiments.
View details for Web of Science ID A1991GV87700019
View details for PubMedID 1763022