2007/06/30 by Debabrata Panja, Gerard T. Barkema, G. T. Barkema
Biochemistry, Genetics and Molecular Biology · Engineering · Materials Science · Physics and Astronomy · #Fuel Cells and Related Materials #Nanopore and Nanochannel Transport Studies #Thermal properties of materials #cond-mat.soft #cond-mat.stat-mech #physics.bio-ph #q-bio.BM
paper · pdf · doi:10.1529/biophysj.107.116434
published as Biophys. J. 94, 1630-1637 (2008) · 7 pages, 4 figures, 6 eps figure files, minor expressions changed, references updated; to appear in Biophys. J
arxiv created 2007/08/16 · openalex publication_date 2007/10/19 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We study the passage times of a translocating polymer of length N in three dimensions, while it is pulled through a narrow pore with a constant force F applied to one end of the polymer. At small to moderate forces, satisfying the condition FNν/kBT\lesssim1, where ν≈0.588 is the Flory exponent for the polymer, we find that τN, the mean time the polymer takes to leave the pore, scales as N2+ν independent of F, in agreement with our earlier result for F=0. At strong forces, i.e., for FNν/kBT≫1, the behaviour of the passage time crosses over to τN∼ N2/F. We show here that these behaviours stem from the polymer dynamics at the immediate vicinity of the pore -- in particular, the memory effects in the polymer chain tension imbalance across the pore.