| phosphonoacetate hydrolase | <enzyme> A zinc-dependent carbon-phosphorus bond cleavage enzyme from pseudomonas fluorescens; n-terminal amino acid sequence given in first source Registry number: EC 3.11.1.- Synonym: phna gene product (26 Jun 1999) |
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| phosphonoacetic acid | <chemical> (carboxymethyl)phosphonic acid. A simple organophosphorus compound that inhibits DNA polymerase, especially in viruses and is used as antiviral agent. Pharmacological action: antiviral agents, reverse transcriptase inhibitors. Chemical name: Acetic acid, phosphono- (12 Dec 1998) |
| phosphonylated acetylcholinesterase | <enzyme> Derivative of acetylcholinesterase (EC 3.1.1.7) Registry number: EC 3.1.1.- (26 Jun 1999) |
| phosphopenia | Low serum phosphate levels. Synonym: phosphorpenia. Origin: phospho-+ G. Penia, poverty (05 Mar 2000) |
| phosphopentose epimerase | <enzyme> An enzyme that catalyses the reversible epimerization of a number of phosphorylated, five-carbon sugars; most notably ribulose 5-phosphate to xylulose 5-phosphate in the pentose phosphate pathway. (05 Mar 2000) |
| phosphopentose isomerase | <enzyme> An enzyme catalyzing interconversion of d-ribose 5-phosphate and d-ribulose 5-phosphate; of importance in ribose metabolism and in the pentose phosphate pathway. Synonym: phosphopentose isomerase, phosphoriboisomerase. (05 Mar 2000) |
| phosphophorin | A protein (MW 155,000) found in dentin that is believed to have a role in mineralization. (05 Mar 2000) |
| phosphoprotein | <protein> Proteins that contain phosphate groups esterified to serine, threonine or tyrosine (s, T or Y). The phosphate group usually regulates protein function. (18 Nov 1997) |
| phosphoprotein phosphatase | <enzyme> A group of enzymes removing the serine- or threonine-bound phosphate groups from a wide range of phosphoproteins, including a number of enzymes which have been phosphorylated under the action of a kinase. (enzyme nomenclature, 1992) Chemical name: Phosphoprotein phosphohydrolase Registry number: EC 3.1.3.16 (12 Dec 1998) |
| phosphopyruvate hydratase | <enzyme> An enzyme of the lyase class that catalyses the dehydration of 2-phosphoglycerate to form phosphoenolpyruvate. Chemical name: 2-Phospho-D-glycerate hydro-lyase Registry number: EC 4.2.1.11 (12 Dec 1998) |
| phosphor | A chemical substance that transforms incident electromagnetic or radioactive energy into light, as in scintillation radioactivity determinations or radiographic intensifying screens or image amplifiers. Origin: G. Phos, light, + phoros, bearing (05 Mar 2000) |
| phosphor plate | The coated plate used in place of a radiographic film cassette in a computed radiography system. (05 Mar 2000) |
| phosphor-bronze | <chemistry> A variety of bronze possessing great hardness, elasticity, and toughness, obtained by melting copper with tin phosphide. It contains one or two per cent of phosphorus and from five to fifteen per cent of tin. Origin: Phosphor + bronze. Source: Websters Dictionary (01 Mar 1998) |
| phosphoramide mustards | <chemical> A group of nitrogen mustard compounds which are substituted with a phosphoramide group or its derivatives. They are usually cytotoxic and used as antineoplastic agent. Pharmacological action: antineoplastic agent, alkylating. (12 Dec 1998) |
| phosphoranes | Inorganic or organic compounds that contain pentavalent phosphorus and the general formula r5p. (12 Dec 1998) |