| adenylyl sulfate-ammonia adenylyltransferase | <enzyme> Forms adenosine 5'-phosphoramidate Registry number: EC 2.7.7.- Synonym: adenylyl sulphate-ammonia adenylyltransferase, as-aat (26 Jun 1999) |
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| ammonia | <biochemistry> The common name for NH3, a strongly basic, irritating, colourlessgas which is lighter than air and readily soluble in water. It is formed in nature as a by-product of protein metabolism in animals.Industrially, it is used in explosives, fertiliser, refrigerants, household cleaningsolutions, etc. Ammonium hydroxide (NH4+), a solution of ammonia gas in water. (09 Oct 1997) |
| ammonia assimilation | The utilization of ammonia (or ammonium ions) in the net synthesis of nitrogen-containing molecules; e.g., glutamine synthetase. Synonym: ammonia fixation. (05 Mar 2000) |
| ammonia detoxication | The detoxication of ammonia and ammonium ion by the formation of ammonium salts, specific nitrogen-excretion products, or l-glutamine. (05 Mar 2000) |
| ammonia fixation | The utilization of ammonia (or ammonium ions) in the net synthesis of nitrogen-containing molecules; e.g., glutamine synthetase. Synonym: ammonia fixation. (05 Mar 2000) |
| ammonia-lyases | <enzyme> Enzymes that catalyze the formation of a c=c bond in a molecule by liberation of ammonia. Registry number: EC 4.3.1. (12 Dec 1998) |
| ammonia monooxygenase | <enzyme> Ammonia is oxidised to hydroxylamine by nitrifying bacterium, nitrosomonas europaea; also hydroxylates alkanes and arenes; converts alkenes to epoxides Registry number: EC 1.7.3.- Synonym: ammonia mono-oxygenase (26 Jun 1999) |
| ammonia rash | Colloquially referred to as diaper, ammonia, or napkin rash; dermatitis of thighs and buttocks resulting from exposure to urine and faeces in infants' diapers. Formerly attributed to ammonia formation; moisture, bacterial growth, and alkalinity may all induce lesions. Synonym: ammonia rash, diaper rash, Jacquet's erythema, napkin rash. (05 Mar 2000) |
| aromatic ammonia spirit | A hydroalcoholic solution containing approximately 2% ammonia and 4% ammonium carbonate and the aromatics: lemon oil, lavender oil, and myristica oil. Used mainly by inhalation to produce reflex stimulation in persons who have fainted or are at risk of syncope. Synonym: sal volatile, smelling salts. (05 Mar 2000) |
| aspartate-ammonia ligase | <enzyme> An enzyme that catalyses the formation of asparagine from ammonia and aspartic acid, in the presence of ATP. Chemical name: L-Aspartate:ammonia ligase (AMP-forming) Registry number: EC 6.3.1.1 (12 Dec 1998) |
| carbamoyl-phosphate synthase (ammonia) | <enzyme> An enzyme that catalyses the formation of carbamoyl phosphate from ATP, carbon dioxide, and ammonia. This enzyme is specific for arginine biosynthesis or the urea cycle. Chemical name: Carbon dioxide:ammonia ligase (ADP-forming, carbamate-phosphorylating) Registry number: EC 6.3.4.16 (12 Dec 1998) |
| glutamate-ammonia ligase | <enzyme> An enzyme that catalyses the conversion of ATP, l-glutamate, and nh3 to ADP, orthophosphate, and l-glutamine. It also acts more slowly on 4-methylene-l-glutamate. Chemical name: L-Glutamate:ammonia ligase (ADP-forming) Registry number: EC 6.3.1.2 (12 Dec 1998) |
| adenylosuccinate lyase | <enzyme> An enzyme that, in the course of purine ribonucleotide biosynthesis, catalyses the conversion of 5'-phosphoribosyl-4-(n-succinocarboxamide)-5-aminoimidazole to 5'-phosphoribosyl-4-carboxamide-5-aminoimidazole and the conversion of adenylosuccinic acid to AMP. Chemical name: N(6)-(1,2-Dicarboxyethyl)AMP AMP-lyase Registry number: EC 4.3.2.2 (12 Dec 1998) |
| adenylylosuccinate lyase | <enzyme> An enzyme that, in the course of purine ribonucleotide biosynthesis, catalyses the conversion of 5'-phosphoribosyl-4-(n-succinocarboxamide)-5-aminoimidazole to 5'-phosphoribosyl-4-carboxamide-5-aminoimidazole and the conversion of adenylosuccinic acid to AMP. Chemical name: N(6)-(1,2-Dicarboxyethyl)AMP AMP-lyase Registry number: EC 4.3.2.2 (12 Dec 1998) |
| alkylmercury lyase | <enzyme> From bacteria; catalyses the protonolysis of the carbon-mercury bond to give hydrocarbon and mercury as a mercaptide Registry number: EC 4.99.1.2 Synonym: organomercury lyase, organomercurial lyase, phenylmercury lyase (26 Jun 1999) |