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Equation: One phase exponential association

Equation: One phase exponential association

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Equation: One phase exponential association

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This equation describes the pseudo-first order association kinetics of the interaction between a ligand and its receptor, or a substrate and an enzyme. Y is either binding or enzyme activity. X is time.

Y starts out equal to zero and increases to a maximum plateau (at equilibrium) equal to YMAX. When X equals 0.6932/K, Y equals 0.5*YMAX.