Michaelis-Menten Enzyme Kinetics
Reaction velocity and percent of Vmax from Vmax, Km, and substrate concentration (v = Vmax[S]/(Km+[S])). Km is the substrate at half Vmax -- an affinity proxy (low Km = high affinity), not a rate; the hyperbola never reaches Vmax.
Formula and source
v = Vmax x [S] / (Km + [S]); percent_vmax = v / Vmax x 100. At [S] = Km, v = Vmax / 2.
The Michaelis-Menten equation (enzyme kinetics), by name.
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