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The spatial distribution of the total charge (per nucleotide) Qtot(R) within a cylindrical region of radius R around the a B-DNA helix of length L=24 in (a) [Na+] and (b) [Mg2+] solutions at room temperature. c0 =0.1M, 0.01M, and 0.001M from top to bottom. Dashed lines, Monte Carlo simulations; dotted lines, Poisson Boltzmann equation; solid lines, the present model.
