Catalytic-activity ratio (cat.ratio)

Synonym

Catalytic ratio

Abbreviation

Cat.ratio

Definition in words

Catalytic-activity of component F divided by catalytic-activity of component G in system 1

Note 1: Component B is the quotient of component F and component G.

Note 2: Component F ≠ Component G (≠ = “not equal to”)

Note 3: Component F ∉ Component G (∉ = “is not an element of”)

Definition by equation

Systematic terms

Catalytic-activity ratio of component B in system 1
Ratio scale
  • Value sets are positive numerical values
  • Algebraic operations are allowed (a=nb; a≠nb)
Numerical values from 0-∞

Unit

10-6, 10-3, 1 (one), 103, 106, etc.

Special rule(s) in the NPU syntax

The catalytic entities (component F and component G) are termed according to the International Enzyme Nomenclature (see Medical and metrological vocabulary).

“Procedure” is stated in the specification to the kind-of-property in the NPU definition.

“Procedure” indicates that the measurement procedure must be stated somewhere else than the NPU code and there may be difficulties in comparing values for the same NPU code.

Reference

Ferard G, Dybkaer R, Fuentes-Arderiu X. Compendium of Terminology and Nomenclature of Properties in Clinical Laboratory Sciences : Recommendations 2016. 1 ed: Royal Society of Chemistry; 2016. 182 p. Doi:10.1039/9781782622451.

Laboratory field

Examples

Molecular Biology and Genetics

Example 1
Generic abbreviated
NPU22149 Muscle prot.—Pyruvatdehydrogenase complex/Citrate (si)-synthase; cat.ratio(25 °C; proc.) = ?
Full result NPU22149 Muscle protein—Pyruvatdehydrogenase complex/Citrate (si)-synthase; catalytic-activity ratio(25 °C; procedure) = 0.75
Abbreviated result NPU22149 Muscle prot.—Pyruvatdehydrogenase complex/Citrate (si)-synthase; cat.ratio(25 °C; proc.) = 0.75
Written expression The catalytic-activity ratio of Pyruvatdehydrogenase complex/Citrate (si)-synthase in Mr. Smith’s muscle protein is [0.75]. The measurement is performed at 25 °C according to a procedure defined by the laboratory.
Equation

Example 2
Generic abbreviated form NPU22153 Muscle prot.—Cytochrome-C oxidase/Citrate (si)-synthase; cat.ratio(25 °C; proc.) = ?
Full form with a result NPU22153 Muscle protein—Cytochrome-C oxidase/Citrate (si)-synthase; catalytic-activity ratio(25 °C; procedure) = 0.18
Abbreviated form with a result NPU22153 Muscle prot.—Cytochrome-C oxidase/Citrate (si)-synthase; cat.ratio(25 °C; proc.) = 0.18
Written expression The catalytic-activity content of Cytochrome-C oxidase/Citrate (si)-synthase in Mr. Smith’s muscle protein is [0.18]. The measurement is performed at 25 °C according to procedure defined by the laboratory.
Equation

Reference

Kind-of-property

  • Nominal kind-of-property

  • Kind-of-quantity

    • Unitary kind-of-quantity

      • Rational unitary kind-of-quantity

        • Catalytic-activity ratio

Reference

  • Dybkaer R. Concept system on ‘quantity’: formation and terminology. Accredit Qual Assur. 2013;18(3):253-60.
  • Dybkaer R. ISO terminological analysis of the VIM3 concepts ‘quantity’ and ‘kind-of-quantity’. Metrologia. 2010;47(3):127-34.
Date Term Note
1996-01-01 Catalytic-activity ratio Term established
Date Notes

Example

2019-06-04 Catalytic component B is an enzyme, defined by the international enzyme nomenclature (https://www.expasy.org/), and shall be used for catalytic-activity kinds-of-property. Proteins are defined and termed by UNIPROT (https://www.uniprot.org/) and should not be used in relation to catalytic-activity kinds-of-property. Though there are overlaps between these two nomenclatures..

The enzyme and protein nomenclatures can have different terms for the same molecule.

  • ABC-type protein transporter (Enzyme nomenclature, identifier EC 7.4.2.5).
  • Alpha-hemolysin (Protein nomenclature, UP identifier P09616).