urease

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urease

 [u´re-ās]
an enzyme that catalyzes the decomposition of urea to ammonia and carbon dioxide.

u·re·ase

(yūr'ē-ās),
An enzyme that catalyzes the hydrolysis of urea to carbon dioxide and ammonia; used as an antitumor enzyme; it is present in intestinal bacteria and accounts for most of the ammonia generated from urea in mammals.

urease

/ure·ase/ (u´re-ās) an enzyme that catalyzes the hydrolysis of urea to ammonia and carbon dioxide; it is a nickel protein of microorganisms and plants that is used in clinical assays of plasma urea concentrations.

urease

(yo͝or′ē-ās′, -āz′) also

urase

(yo͝or′ās′, -āz′)
n.
An enzyme that catalyzes the hydrolysis of urea to form ammonium carbonate.

urease

[yoo͡r′ē·ās]
1 an enzyme used in the determination of urea in the blood or urine.
2 an enzyme that catalyzes the hydrolysis of urea to carbon dioxide and ammonia.
3 an antitumor enzyme.

urease

An enzyme that breaks down urea to ammonia and carbon dioxide.
Ureaseclick for a larger image
Fig. 312 Urease . The hydrolysis of urea.

urease

an enzyme that catalyses the hydrolysis of UREA into carbon dioxide and ammonia.

u·re·ase

(yūr'ē-ās)
An enzyme used as an antitumor agent; it is present in intestinal bacteria.

urease,

n an enzyme that divides urea into carbon dioxide and ammonia.

urease

an enzyme that catalyzes the decomposition of urea to ammonia and carbon dioxide, present in high activity in ruminal microflora.

urease inhibitors
compounds that inhibit or block the activity of urease, most commonly used in the management of struvite urolithiasis. See also acetohydroxamic acid.
urease tests
a biochemical test used in the identification of some bacteria such as Proteus spp. Using urea agar or broth, bacteria producing urease will cause the formation of ammonia, which is detected by phenol red in the medium.
References in periodicals archive ?
Rawluk CDL, Grant CA, Racz GJ (2001) Ammonia volatilization from soils fertilized with urea and varying rates of urease inhibitor NBPT.
Watson CJ, Akhonzada NA, Hamilton JTG, Matthews DI (2008) Rate and mode of application of the urease inhibitor N-(n-butyl) thiophosphoric triamide on ammonia volatilization from surface-applied urea.
Watson C J, Miller H (1996) Short-term effects of urea amended with the urease inhibitor N-(n-butyl) thiophosphoric triamide on perennial ryegrass.
Varel VH (1997) Use of urease inhibitors to control nitrogen loss from livestock waste.
Varel VH, Nienaber JA, Freetly HC (1999) Conservation of nitrogen in cattle feedlot waste with urease inhibitors.
However, like the other thiophosphoryl triamides it is not a urease inhibitor.
The choice of controlled release fertiliser, urease inhibitor, or nitrification inhibitor is likely to be determined more by factors such as price and availability rather than by degree of effectiveness, as many of the compounds shown to be very effective in the laboratory and small-scale trials are not available commercially.
Fox RH, Piekielek WP (1993) Management and urease inhibitor effect on nitrogen use efficiency in no-till corn.
Hendrickson LL (1992) Corn yield response to the urease inhibitor NBPT 5-year summary.
Lin XJ, Chen JC, Zhen SL, Liu ZZ, Freney JR (1997) Studies on characteristics, crystal structure and effectiveness of urease inhibitor from Aspergillus ochraccus wilh.
Scblegel AJ (1991) Reduced ammonia phytotoxicity from UAN solution by urease inhibitor N-(normal-butyl) Thiophosphoric Triamide.