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. Author manuscript; available in PMC: 2018 Nov 28.
Published in final edited form as: Science. 2015 Sep 25;349(6255):1504–1510. doi: 10.1126/science.aab1369

Fig. 7. Viscosity dependence of persistence times for a number of ion pairs.

Fig. 7.

The persistence time is reported on a logarithmic plot as a function of viscosity relative to TIP3P for the Na…Cl ion pair (black), the guanidinum…acetate ion pair (red), the butyl-guanidinum…butyric acid ion pair (green, representing the side chains of Arg and Glu), a butyl-guanidinum…butyric acid ion pair where the terminal carbon atoms have been restrained at a distance of 10 Å (blue), and the Arg…Glu/Asp salt bridges in the α3D transition path (purple). A power-law fit with exponents ranging between 0.51 and 0.56 is reported in solid lines, while the exponent of 1.0 predicted by hydrodynamic Kramers’ theory is shown as a dashed line.