Fig. 7. Rate of PSI-P700⁺ reduction increases linearly with redox mediator concentration. Above concentrations of 10 mM, rates of electron transfer increased linearly with the addition of Co redox mediator #2, the di-methoxy PF₆⁻ variant. Kinetics traces were fit to single-phase exponential association equations, the observed rates, R² and calculated half-lives of which can be seen in the table.