Entitic catalytic activity (entitic cat.act.)
Abbreviation |
Entitic cat.act. | ||
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Definition in words |
Catalytic-activity of component B divided by number of system 1 in system 2 Alternative expression: Catalytic-activity of component B per system 1 in system 2 Note 1: Component B is a catalytic component |
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Definition by equation |
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Systematic terms
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Entitic catalytic-activity of component B in system 2 | ||
Result type |
Rational scale |
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Numerical values from 0-∞ |
Unit |
akat, fkat, pkat, nkat, µkat, mkat, U, pU, nU, etc. Note 1: The correct unit is e.g. “akat/1” but “1” is omitted. Note 2: Katal, “kat”, is recommended unit for catalytic-activity kind-of-quantity. (kat=mol/s) Note 3: Enzyme unit, “U”, is acceptable for use (e.g. U, kU) but it is recommended to use katal. (U=µmol/min) |
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Special rule(s) in the NPU syntax |
The catalytic component (component B) is 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. |
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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. |
Laboratory field |
Examples |
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Clinical Chemistry |
Example 1 | |
Generic abbreviated form | NPU57414 Ercs(B)—Pyruvate kinase; entitic cat.act.(37 °C; proc.) = ? pU | |
Full form with a result | NPU57414 Erythrocytes(Blood)—Pyruvate kinase; entitic catalytic-activity(37 °C; procedure) = 44 pico Enzyme Unit | |
Abbreviated form with a result | NPU57414 Ercs(B)—Pyruvate kinase; entitic cat.act.(37 °C; proc.) = 44 pU | |
Written expression | The catalytic-activity of Pyruvate kinase divided by number of Erythrocytes in Mr. Smith’s blood is [44] pU. The measurement is performed at 37 °C according to a procedure defined by the laboratory. | |
Equation
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Notes
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Alternative written expression: The catalytic-activity of Pyruvate kinase per Erythrocyte in Mr. Smith’s blood is [44] pU. |
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Example 2 | ||
Generic abbreviated form | NPU03340 Ercs(B)—Pyruvate kinase; entitic cat.act.(37 °C; proc.) = ? akat | |
Full form with a result | NPU03340 Erythrocytes(Blood)—Pyruvate kinase; entitic catalytic-activity(37 °C; procedure) = 25 attokatal | |
Abbreviated form with a result | NPU03340 Ercs(B)—Pyruvate kinase; entitic cat.act.(37 °C; proc.) = 25 akat | |
Written expression | The catalytic-activity of Pyruvate kinase divided by number of Erythrocytes in Mr. Smith’s blood is [25] akat. The measurement is performed at 37 °C according to a procedure defined by the laboratory. | |
Equation |
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Notes |
Alternative written expression: The catalytic-activity of Pyruvate kinase per Erythrocyte in Mr. Smith’s blood is [25] akat. |
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Molecular Biology and Genetics |
Example 3
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Generic abbreviated form | NPU57390 Ercs(B)—Glucose-6-phosphate dehydrogenase; entitic cat.act.(37 °C; proc.) = ? pU | |
Full form with a result | NPU57390 Erythrocytes(Blood)—Glucose-6-phosphate dehydrogenase; entitic catatlytic-activity(37 °C; procedure) = 75 pico Enzyme Unit | |
Abbreviated form with a result | NPU57390 Ercs(B)—Glucose-6-phosphate dehydrogenase; entitic cat.act.(37 °C; proc.) = 75 pU | |
Written expression | The catalytic-activity of Glucose-6-phosphate dehydrogenase divided by number of Erythrocytes in Mr. Smith’s blood is [75] pU. The measurement is performed at 37 °C according to a procedure defined by the laboratory | |
Equation | ||
Notes |
Alternative written expression: The catalytic-activity of Glucose-6-phosphate dehydrogenase per Erythrocyte in Mr. Smith’s blood is [75] pU |
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Example 4 | ||
Generic abbreviated form | NPU01080 Lymcs—Adenosine deaminase; entitic cat.act.(37 °C; proc.) = ? akat | |
Full form with a result | NPU01080 Lymphocytes—Adenosine deaminase; entitic catalytic-activity(37 °C; procedure) = 100 attokatal | |
Abbreviated form with a result | NPU01080 Lymcs—Adenosine deaminase; entitic cat.act.(37 °C; proc.) = 100 akat | |
Written expression | The catalytic-activity of Adenosine deaminase divided by number of Mr. Smith’s Lymphocytes is [100] akat. The measurement is performed at 37 °C according to a procedure defined by the laboratory | |
Equation | ||
Notes |
Alternative written expression: The catalytic-activity of Adenosine deaminase per Mr. Smith’s Lymphocyte blood is [100] akat. |
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Reproduction and Fertility |
Example 5 |
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Generic abbreviated form | NPU01069 Spmzoa—Acrosin; entitic cat.act.(37 °C; proc.) = ? akat | |
Full form with a result | NPU01069 Spermatozoa—Acrosin; entitic catalytic-activity(37 °C; procedure) = 15 attokatal | |
Abbreviated form with a result | NPU01069 Spmzoa—Acrosin; entitic cat.act.(37 °C; proc.) = 15 akat | |
Written expression | The catalytic-activity of Acrosin divided by number of Mr. Smith’s spermatozoa is [15] akat. The measurement is performed at 37 °C according to a procedure defined by the laboratory. | |
Equation | ||
Notes |
Alternative written expression: The catalytic-activity of Pyruvate kinase per Erythrocyte in Mr. Smith’s blood is [15] pU |
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Reference |
NPU database, https://www.ifcc.org/ifcc-scientific-division/sd-committees/c-npu/npusearch/ and http://www.labterm.dk/default.aspx |
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Kind-of-property
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Nominal kind-of-property
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Kind-of-quantity
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Unitary kind-of-quantity
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Rational unitary kind-of-quantity
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Entitic catalytic activity
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Reference |
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Date | Term | Note |
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1996-01-01 | Entitic catalytic activity | Term established |
NPU term identifier |
QU50030 |