273 research outputs found
Adsorption of a random heteropolymer at a potential well revisited: location of transition point and design of sequences
The adsorption of an ideal heteropolymer loop at a potential point well is
investigated within the frameworks of a standard random matrix theory. On the
basis of semi-analytical/semi-numerical approach the histogram of transition
points for the ensemble of quenched heteropolymer structures with bimodal
symmetric distribution of types of chain's links is constructed. It is shown
that the sequences having the transition points in the tail of the histogram
display the correlations between nearest-neighbor monomers.Comment: 11 pages (revtex), 3 figure
How to Define Variation of Physical Properties Normal to an Undulating One-Dimensional Object
One-dimensional flexible objects are abundant in physics, from polymers to
vortex lines to defect lines and many more. These objects structure their
environment and it is natural to assume that the influence these objects exert
on their environment depends on the distance from the line-object. But how
should this be defined? We argue here that there is an intrinsic length scale
along the undulating line that is a measure of its "stiffness" (i.e.,
orientational persistence), which yields a natural way of defining the
variation of physical properties normal to the undulating line. We exemplify
how this normal variation can be determined from a computer simulation for the
case of a so-called bottle-brush polymer, where side chains are grafted onto a
flexible backbone.Comment: 4 pages, 4 figure
How long does it take to pull an ideal polymer into a small hole?
We present scaling estimates for characteristic times and
of pulling ideal linear and randomly branched polymers of
monomers into a small hole by a force . We show that the absorbtion process
develops as sequential straightening of folds of the initial polymer
configuration. By estimating the typical size of the fold involved into the
motion, we arrive at the following predictions: and , and we also confirm them by
the molecular dynamics experiment.Comment: 4 pages, 3 figure
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