### Medical Definition of Victor-Michaelis-Menten equation

**1.**
Equation derived from a simple kinetic model for a single-substrate non-cooperative enzyme-catalyzed reaction that successfully accounts for the hyperbolic adsorption isotherm) relationship between substrate concentration and reaction rate.
V = Vmax x S/(S + Km), where V is the initial velocity of the reaction, Km is the Michaelis constant, Vmax is the maximum rate approached by very high substrate concentrations and S is the initial substrate concentration.
Similar equations can be derived for conditions in which the product is present and for multisubstrate enzymes.
Synonym: Victor-Michaelis-Menten equation.
(12 Jul 2000)

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