The excess chemical potential of a dilute solution of spherical polyelectrolytes is calculated in the limit of the linear Debye-Hiickel theory. The charge distribution within each polyelectrolyte is expanded in terms of its spherical harmonics. The calculation includes the effect of the finite radius of both of a pair of polyelectrolytes on the screening of their electostatic interactions. It is found that the term in the excess chemical potential of a minimum-salt protein solution that depends on the square …
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