Nomenclature Committee of the International Union of Biochemistry (NC-IUB)
Units of Enzyme Activity
Comments and suggestions for future revisions may be sent to any member of the committee: P. Karlson (chairman), H. Bielka, B. L. Horecker, W. B. Jakoby, B. Keil, C. Liébecq (as chairman of the IUB Committee of Edition of Biochemical Journals), B. Lindberg and E. C. Webb, or its secretary: H. B. F. Dixon, University Department of Biochemistry, Tennis Court Road, Cambridge, England, CB2 1QW.
1The term ‘rate of reaction’ as used in this document follows the definition of reference 4 and signifies a quantity with dimensions (amount of substance)/time (units: mol · s−1). We should point out that these words are often used for a quantity with dimensions (amount-of-substance concentration)/time (units: mol · dm−3· sC1). This discrepancy and a proposal to call the former (extensive) quantity ‘rate of conversion’ and the latter (intensive) quantity ‘rate of reaction’ are being considered by a IUPAC Subcommittee on Symbolism and Terminology in Chemical Kinetics (Chairman: K. J. Laidler, Department of Chemistry, University of Ottawa. Ottawa, Canada, KIN 6N5, to whom comments may be sent).
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