FIG. 5.

Na⁺ ion cylindrical distributions around the 25 bp poly(dA·dT) DNA duplex derived from the explicit water MD simulations with the TIP3P water model (thick solid black line) and from the non-linear PB calculation using experimental Na⁺ value 1.02 Å for monovalent ion radii (dashed blue line) and “standard” 2 Å Na⁺ radius (thin solid red line).