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

FIGURE 7.

FIGURE 7

The calculated variation of the nucleotide and metal ion surface coverage on the silica surface as a function of divalent salt concentration using the following poly(U) solution parameters: pH = 6.7; hydrated ion radius, 0.45 nm; zinc layer thickness, 0.4 nm; pKa = 7.2; pK = 5.8; silanol group surface density, 5/nm2; poly(U) concentration, 33 μM (in terms of nucleotide concentration); distance between neighboring charges is 0.45 nm; diameter of poly(U), 1 nm; and number of nucleotides per chain, 2500. The black circle marks the XSW experimental result, Hg surface density 0.016/nm2, for divalent salt concentration 37 μM.