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a unit of measurement proposed to express activities of all catalysts, including enzymes, being that amount of a catalyst that catalyzes a reaction rate of 1 mole of substrate per second. Symbol kat.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

kat·al (kat),

1. Unit of catalytic activity equal to 1 mol of product formed (or substrate consumed) per second.
2. The amount of enzyme that catalyzes transformation of 1 mol of substrate per second.
Farlex Partner Medical Dictionary © Farlex 2012


(kat) (kat'ăl)
Unit of catalytic activity equal to one mole of product formed (or substrate consumed) per second, as of the amount of enzyme that catalyzes transformation of one mole of substrate per second.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012


A unit of enzyme activity in the SI system. 1 international unit is equal to 16.6 nanokatal.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005
References in periodicals archive ?
Engineers created the Katal Landing Pad so snowboarders can practice tricks without getting hurt.
One TK REA enzyme unit (U) corresponds to the activity giving 2.2 x [10.sup.-12] katal (0.13 nmol/min of AZTMP), or 0.13 mIU in the ELISA.
(1) using a commercial cholesterol determination kit (KATAL, Belo Horizonte, MG, Brazil).
Serum activity of enzymes, such as aspartate aminotransferase (AST), gamma glutamyltransferase (GGT) and alanine transferase (ALT), as well as the levels of urea, creatinine, cholesterol, glucose, total protein and albumin were determined using commercial kits (Katal, Belo Horizonte, MG) and an automatic analyzer SBA-2000 (Celm, Barueri, SP).
kaumna kateba jahi gaii katal, bakari muragi kini phuramai jeta dlsaim atma ghatl, itana kljama torai chati (8.3; Callewaert and Sharma 2000: 77) What Holy Book orders cows to be killed?
He also classified stationary nets into gill nets, hook and line, traps, katal fishing, bana fishing, and dewatering.
A further IUPAC/IFCC Tentative Recommendation in 1972 (10) preferred the etymologically correct spelling of katal (kat) and was in agreement with the NPAC/NB Commission on Biochemical Nomenclature.
The operations were conducted near the towns of Basram, Katal, Maidani, Qasaba, Salim Gar, Noori and Alingar.
At the end of the incubation period, an aliquot of the infranatant was removed for enzymatic determination of glycerol released into the incubation medium (KATAL, Belo Horizonte, MG, Brazil).
One of the released persons, Haji Muhammad Katal, 46, said he spent more than one year in prison at the Bagram.