Parameter-free prediction of DNA dynamics in planar extensional flow of semidilute solutions

摘要: The dynamics of individual Deoxyribonucleic acid (DNA) molecules in semidilute solutions undergoing planar extensional flow is simulated using a multiparticle Brownian algorithm, which incorporates hydrodynamic and excluded volume interactions the context coarse-grained bead-spring chain model for DNA. successive fine-graining protocol [P. Sunthar J. R. Prakash, Macromolecules 38, 617–640 (2005); Prabhakar et al., Rheol. 48, 1251–1278 (2004)], simulation data acquired chains with increasing values number beads Nb, extrapolated to Kuhn steps NK DNA (while keeping key physical parameters invariant), used obtain parameter-free predictions range Weissenberg numbers Hencky strain units. A systematic comparison carried out experimental observations Hsiao al. [J. (in press)], who have recently single molecule techniques investigate dil...