 (One might note that pseudo-zero-order kinetics uses excess values much much greater in magnitude than the one equivalent of substrate).Defining the parameter of excess ("e") allows for the construction of same-excess experiments in which two or more runs of a kinetic experiment with different initial concentrations, but the same-excess allow one to artificially enter the reaction at any point.These experiments are critical for RPKA of catalytic reactions, as they enable one to probe a number of mechanistic possibilities including catalyst activation (induction periods), catalyst deactivation, and product inhibition described in further detail below.