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. 2006 Feb 15;90(4):1164–1174. doi: 10.1529/biophysj.105.070649

FIGURE 6.

FIGURE 6

Effect of monovalent salt on the nucleotide and divalent metal ion surface density. For the solution without monovalent salt, we use the following parameters from our XSW experiment: pH = 6.7; hydrated ion radius, 0.45 nm; zinc layer thickness, 0.4 nm; pKa = 7.2; silanol group surface density, 5/nm2; poly(U) concentration, 33 μM (in term of nucleotide concentration); divalent salt concentration, 37 μM; distance between neighboring charges, 0.45 nm; diameter of poly(U), 1 nm; and number of nucleotides per chain, 2500. The short solid and dashed lines mark the XSW experimental results for Zn surface density (0.031/nm2) and Hg surface density (0.016/nm2), respectively. The solution with NaCl has the same parameters as the experiment except that the concentration of monovalent salt is 150 μM.