international unit of enzyme activity

international unit of enzyme activity
the amount of an enzyme that will catalyze the transformation of 1 micromole of substrate per minute under standard conditions of temperature, optimal pH, and optimal substrate concentration. Symbol U.

Medical dictionary. 2011.

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  • International unit — In pharmacology, the International Unit is a unit of measurement for the amount of a substance, based on biological activity or effect. It is abbreviated as IU, as UI (Spanish unidad internacional or French unité internationale or Italian unità… …   Wikipedia

  • enzyme activity — the catalytic effect exerted by an enzyme, expressed as units per milligram of enzyme (specific activity) or as molecules of substrate transformed per minute per molecule of enzyme (molecular activity). The conventional unit of enzyme activity is …   Medical dictionary

  • enzyme unit — see international u. of enzyme activity …   Medical dictionary

  • unit — 1. One; a single person or thing. 2. A standard of measure, weight, or any other quality, by multiplications or fractions of which a scale or system is formed. 3. A group of persons or things considered as a whole because of mutual activities or… …   Medical dictionary

  • Enzyme assay — Beckman DU640 UV/Vis spectrophotometer. Enzyme assays are laboratory methods for measuring enzymatic activity. They are vital for the study of enzyme kinetics and enzyme inhibition. Contents …   Wikipedia

  • Enzyme unit — The enzyme unit (U) is a unit for the amount of a particular enzyme. [cite journal |author=Nomenclature Committee of the International Union of Biochemistry (NC IUB) |title=Units of Enzyme Activity |journal=Eur. J. Biochem. |volume=97… …   Wikipedia

  • U — 1. Abbreviation for unit. 2. Symbol for kilurane; uranium; uridine in polymers; uracil; urinary concentration, followed by subscripts indicating location and chemical species. Symbol for internal energy. * * * …   Medical dictionary

  • U — • congenital limb absence; • in electrocardiography, an undulating deflection that follows the T wave; • internal energy; • International Unit of enzyme activity; • Mann Whitney rank sum statistic; • potential difference (in volts); • ulcer; •… …   Dictionary of medical acronyms & abbreviations

  • endocrine system, human — ▪ anatomy Introduction  group of ductless glands (gland) that regulate body processes by secreting chemical substances called hormones (hormone). Hormones act on nearby tissues or are carried in the bloodstream to act on specific target organs… …   Universalium

  • Chemical biology — is a scientific discipline spanning the fields of chemistry and biology that involves the application of chemical techniques and tools, often compounds produced through synthetic chemistry, to the study and manipulation of biological systems.… …   Wikipedia

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