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An enzyme that catalyzes the degradation of urea to ammonia and carbon dioxide; obtained from the seed of jack bean.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



(carbamide amidohydrolase), an enzyme of the hydrolase class that catalyzes the breakdown of urea into ammonia and carbon dioxide. It is found in many bacteria and fungi and in some invertebrates, but is especially abundant in the seeds of such legumes as soybeans and jack beans. Urobacteria contain active urease. Urease was the first enzyme prepared in the crystalline state, by J. Sumner (1926). It is used for the quantitative determination of urea because of its high specificity.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
False-negative urease tests have been reported in association with several factors.
Bacterial culture, Rapid urease test, PCR assay, and histology are the invasive methods applied to diagnose the H.
pylori tests which were used in this study included rapid urease test (RUT), urea breath test (UBT), and serological and urinary H.
Laine L, Lewin D, Naritoku W, et al: Prospective comparison of commercially available rapid urease tests for the diagnosis of Helicobacter pylori.
Each patient's infection status had previously been determined by using a panel of six tests: (a) rapid urease test (CLO[R] test only), (b) antral histology with hematoxylin and eosin stain, (c) antral histology with silver stain, (d) ELISA for IgG antibody, (e) ELISA for IgA antibody, and (f) [[sup.13]C]UBT.
After endoscopy, inclusion criteria were: active peptic (duodenal or gastric) ulcer with >5 mm in diameter and a positive urease test of an antral sample at <60 minutes (Jatrox-Test).
The CLO test and rapid urease test are of similar sensitivity and specificity i.e.
pylori by using endoscopic biopsy specimens--(1) Rapid urease test (2) Grams staining (3) culture--most difficult yet gold standard with high specificity.
Histological examination of gastric tissue, bacterial cultures, rapid urease test, use of DNA probes, and PCR analysis, when used to test gastric tissue, all require endoscopy.
2) and the remaining biopsy specimen sent for rapid urease test (see Fig.
Purity of the growth was checked by Gram staining, Oxidase, Catalase, Rapid Urease Test (RUT) and sub culture was done on solid medium (Brucella agar) and incubating in aerobic and microaerobic conditions.