| purine phosphoribosyltransferase | <enzyme> Specific purine phosphoribosyltransferases are EC 2.4.2.7 and 2.4.2.8. Registry number: EC 2.4.2.- (26 Jun 1999) |
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| purine ribonucleoside | A toxic nucleoside isolated from the mushroom Agaricus nebularis and from Streptomyces sp. Synonym: 9-beta-ribofuranosylpurine, purine ribonucleoside, ribosylpurine. (05 Mar 2000) |
| purine-free diet | A diet containing a minimal quantity of purine bases (meats); liver, kidney, and sweetbread especially are excluded and replaced by dairy products, fruits, and cereals; alcoholic beverages also are excluded. Synonym: purine-free diet. (05 Mar 2000) |
| purine-nucleoside phosphorylase | <enzyme> An enzyme that catalyses the reaction between a purine nucleoside and orthophosphate to form a free purine plus ribose-5-phosphate. Chemical name: Purine-nucleoside:orthophosphate ribosyltransferase Registry number: EC 2.4.2.1 (12 Dec 1998) |
| purine-restricted diet | See: gout diet. (05 Mar 2000) |
| purinergic receptor | <biochemistry> Receptors that use purine nucleotides (e.g. ATP) as ligands. (18 Nov 1997) |
| purines | A series of heterocyclic compounds that are variously substituted in nature and are known also as purine bases. They include adenine and guanine, constituents of nucleic acids, as well as many alkaloids such as caffeine and theophylline. Uric acid is the metabolic end product of purine metabolism. (12 Dec 1998) |
| purity | The condition of being pure. Specifically: Freedom from foreign admixture or deleterious matter; as, the purity of water, of wine, of drugs, of metals. Cleanness; freedom from foulness or dirt. "The purity of a linen vesture." . Freedom from guilt or the defilement of sin; innocence; chastity; as, purity of heart or of life. Freedom from any sinister or improper motives or views. Freedom from foreign idioms, or from barbarous or improper words or phrases; as, purity of style. Origin: OE. Purete, purte, OF. Purte, F. Purete, from L. Puritas, fr. Purus pure. See Pure. Source: Websters Dictionary (01 Mar 1998) |