Michaelis constant, Km

https://doi.org/10.1351/goldbook.M03891
Substance concentration of substrate at which the rate of reaction is equal to one half of the limiting rate (maximum rate).
Notes:
  1. Also called the Michaelis concentration
  2. The Michaelis constant (Michaelis concentration) may be used only when Michaelis–Menten kinetics is obeyed.
Source:
PAC, 1996, 68, 957. (Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations 1996)) on page 981 [Terms] [Paper]
Citation: 'Michaelis constant' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.M03891 RIS BibTex EndNote
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