A mean-field theory based on Gibbs-Bogoliubov inequality is constructed to
study the interactions between two like-charged polyions, It is shown that
contrary to the previously established paradigm, a properly constructed mea
n-field theory can quantitatively account for the attractive interactions b
etween two like-charged rods. (C) 2000 Elsevier Science B.V. All rights res
erved.