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. 2011 May 18;100(10):2475–2485. doi: 10.1016/j.bpj.2011.03.059

Figure 5.

Figure 5

Effects of the finite particle sizes on substrate and counterion densities. (a) The value as is the size of the substrate. All ion sizes are set to 3.0 Å in the SMPNP models. The bulk ionic strength is 150 mM, and bulk substrate density is 100 mM. (b) In SMPNP-1, the sizes for coion, counterion, and substrate are 3.0, 3.0, and 3.0 Å, respectively; In SMPNP-2, these sizes are 3.0, 5.0, and 5.0 Å. The bulk densities are the same as in panel a. For comparison, the ionic strength is set to 50 mM in the PB calculation because in such cases the counterion bulk density is the same as in the SMPNP case (coion bulk density is 150 mM, substrate bulk density 100 mM, counterion bulk density 50 mM).