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Biophys J, March 2001, p. 1186-1194, Vol. 80, No. 3
Laboratory of Physical Chemistry and Colloid Science and Food Physics Group, Department of Agiotechnology and Food Sciences, Wageningen University, Bomenwegz, 6703 HD Wageningen, The Netherlands
A simple semi-empirical theory is developed for the ionic
strength dependence of the flexible polymer-induced condensation of
semiflexible polyelectrolytes such as DNA and F-actin filaments. Critical concentrations of flexible polymer needed for condensation are
calculated by comparing the free energies of inserting the semiflexible
polyelectrolytes in a solution of flexible polymers, respectively, in
their free state, and in their condensed state. Predictions of the
theory are compared to experimental data on the condensation of DNA and
F-actin filaments induced by the flexible polymer poly(ethylene oxide).
The theory also predicts that reentrant decollapse is possible at low
ionic strength and high concentrations of flexible polymer, as observed
for DNA.
Biophys J, March 2001, p. 1186-1194, Vol. 80, No. 3
© 2001 by the Biophysical Society 0006-3495/01/03/1186/09 $2.00
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