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 mondofacto - Online Medical Dictionary
Category: Health and Medicine > Medical Dictionary
Date & country: 26/01/2008, UK
Words: 116197


phosphinic acids
Hypophosphorous acids. Inorganic or organic derivatives of phosphinic acid, h2po(oh). They include phosphinates and phosphinic acid esters. ... (12 Dec 1998) ...

phosphinico-
In chemistry, symmetrically doubly substituted phosphinic acid, R2P(O)OH. ... (05 Mar 2000) ...

phosphites
Inorganic salts or organic esters of phosphorous acid that contain the (3-)po3 radical. ... (12 Dec 1998) ...

phospho-
<prefix> Prefix for O-phosphono-, which may replace the suffix phosphate; e.g., glucose phosphate is O-phosphonoglucose or phosphoglucose. ... See: phosph-, phosphoryl-. ... (05 Mar 2000) ...

phospho-3-hexuloisomerase
<enzyme> Chemical name: d-arabino-3-hexulose 6-phosphate 3,2-ketoisomerase ... Registry number: EC 5.3.1.- ... (26 Jun 1999) ...

phosphoacetylglucosamine mutase
<enzyme> Formerly EC 2.7.5.2 ... Registry number: EC 5.4.2.3 ... Synonym: acetylaminodeoxyglucose phosphomutase, acetylglucosamine phosphomutase ... (26 Jun 1999) ...

phosphoacylase
Synonym for phosphate acetyltransferase ... <enzyme> An enzyme that catalyses the synthesis of acetylphosphate from acetyl-CoA and inorganic phosphate. Acetylphosphate serves as a high-energy phosphate compound. ... Chemical name: Acetyl-CoA:orthophosphate acetyltransferase ... Registry number: EC 2.3.1.8 ... (12 Dec 1998) ...

phosphoadenosine phosphosulfate
<chemical> 3'-phosphoadenosine-5'-phosphosulfate. Key intermediate in the formation by living cells of sulfate esters of phenols, alcohols, steroids, sulfated polysaccharides, and simple esters, such as choline sulfate. It is formed from sulfate ion and ATP in a two-step process. This compound also is an important step in the process of sulfu …

phosphoadenylate 3'-nucleotidase
<enzyme> From guinea pig liver; catalyses the hydrolysis of the 2'- or 3'-phosphate from the appropriate nucleoside 2',5'- and 3',5'-bisphosphates with the formation of nucleoside 5'-phosphate; homologous to inositol phosphatases ... Registry number: EC 3.1.3.7 ... Synonym: (2')3',5'-bisphosphate nucleotidase, bisphosphoadenylate 3'-nucleotidas …

phosphoamidase
<enzyme> An enzyme catalyzing the hydrolysis of phosphorus-nitrogen bonds, notably the hydrolysis of N-phosphocreatine to creatine and orthophosphate. ... Synonym: phosphamidase. ... (05 Mar 2000) ...

phosphoamides
Amides of phosphoric acid (phosphoramidic acids) and their salts or esters (phosphoramidates), of the general formula (HO)2P(O)-NH2; e.g., creatine phosphate. ... (05 Mar 2000) ...

phosphoamino acids
Amino acids that contain phosphorus as an integral part of the molecule. ... (12 Dec 1998) ...

phosphoarginine
A compound (in particular, a phosphagen) of l-arginine with phosphoric acid containing the phosphoamide bond; a source of energy in the contraction of muscle in invertebrates, corresponding to phosphocreatine in the muscles of vertebrates. ... Compare: phosphocreatine. ... Synonym: arginine phosphate. ... (05 Mar 2000) ...

phosphocellobiase
<enzyme> Cellobiose monophosphate and water gives glucose and glucose-6-p ... Registry number: EC 3.2.1.- ... (26 Jun 1999) ...

phosphocholine
(CH3)3N+-CH2 CH2-OPO3 H-; choline O-phosphate;important in choline metabolism, e.g., as in cytidinediphosphocholine and in the biosynthesis of lecithins. ... Synonym: O-phosphocholine, phosphorylcholine. ... Phosphocholine cytidylyltransferase, an enzyme that catalyses the reaction of phosphocholine with CTP to form pyrophosphate and CDP-choline; the …

phosphocholine phosphatase
<enzyme> Unlike alkaline phosphatase the hamster heart enzyme has a different pH optimum and heat sensitivity and is not inhibited by amino acids ... Registry number: EC 3.1.3.- ... (26 Jun 1999) ...

phosphocreatine
<biochemistry> Present in high concentration (about 20mM) in striated muscle and is synthesised and broken down by creatine phosphokinase to buffer ATP concentration. It acts as an immediate energy reserve for muscle. ... (18 Nov 1997) ...

phosphodiester
A diesterified orthophosphoric acid, RO-(PO2H)-OR', as in the nucleic acids. ... (05 Mar 2000) ...

phosphodiester bond
<chemistry> Not a precise term. Refers to any molecule in which two parts are joined through a phosphate group. ... Examples are found in RNA, DNA, phospholipids, cyclic nucleotides, nucleotide diphosphates and triphosphates. ... (18 Nov 1997) ...

phosphodiester hydrolases
Synonym for phosphodiesterases ... Enzymes (EC sub-subclass 3.1.4) cleaving phosphodiester bonds, such as those in cAMP or between nucleotides in nucleic acids, liberating smaller poly-or oligonucleotide units or mononucleotides but not inorganic phosphate. ... Synonym: phosphodiester hydrolases. ... (05 Mar 2000) ...

phosphodiester linkage
<biochemistry> A chemical linkage in which two alcohols are esterically boundto a bridging molecule of phosphoric acid. ... (31 Dec 1997) ...

phosphodiesterase
<enzyme> An enzyme that cleaves phosphodiesters to give a phosphomonoester and a free hydroxyl group. ... Examples include RNase, DNase, phospholipases C and D and the enzymes that convert cyclic nucleotides to the monoester forms. In casual usage the cAMP phosphodiesterase is usually meant. ... (18 Nov 1997) ...

phosphodiesterase inhibitors
Compounds which inhibit or antagonise the biosynthesis or actions of phosphodiesterases. ... (12 Dec 1998) ...

phosphodiesterases
Enzymes (EC sub-subclass 3.1.4) cleaving phosphodiester bonds, such as those in cAMP or between nucleotides in nucleic acids, liberating smaller poly-or oligonucleotide units or mononucleotides but not inorganic phosphate. ... Synonym: phosphodiester hydrolases. ... (05 Mar 2000) ...

phosphodismutase
Synonym for phosphomutase ... One of a number of enzymes (mutases) (EC sub-subclass 5.4.2) that apparently catalyze intramolecular transfer because the donor is regenerated (e.g., phosphoglyceromutase, phosphoglucomutase). ... Synonym: phosphodismutase. ... (05 Mar 2000) ...

phosphoenolpyruvate
<biochemistry> An important metabolic intermediate. The enol (less stable) form of pyruvic acid is trapped as its phosphate ester, giving the molecule a high phosphate transfer potential. Formed from 2 phosphoglycerate by the action of enolase. ... (31 Dec 1997) ...

phosphoenolpyruvate carboxykinase
phosphoenolpyruvic acid carboxykinase ...

phosphoenolpyruvate carboxylase
<enzyme> An enzyme with high affinity for carbon dioxide. It catalyses irreversibly the formation of oxaloacetate from phosphoenolpyruvate and carbon dioxide. This fixation of carbon dioxide in several bacteria and some plants is the first step in the biosynthesis of glucose. ... Chemical name: Orthophosphate:oxaloacetate carboxy-lyase (phosph …

phosphoenolpyruvate mutase
<enzyme> Isolated from t pyriformis; forms a carbon-phosphorus bond in the transformation of phosphoenolpyruvate to phosphonopyruvate ... Registry number: EC 5.4.2.9 ... Synonym: phosphoenolpyruvate phosphomutase ... (26 Jun 1999) ...

phosphoenolpyruvic acid
CH2==C(OPO3H2)-COOH;the phosphoric ester of pyruvic acid in the latter's enol form; an intermediate in the conversion of glucose to pyruvic acid and an example of a high energy phosphate ester. ... Phosphoenolpyruvic acid carboxykinase, an enzyme that catalyses the reaction of oxaloacetate and GTP to form phosphoenolpyruvic acid, CO2, and GDP; a key …

phosphoethanolamine
2-O3POCH2CH2NH3 +;a key intermediate in the formation of cephalins; formed in liver and brain by phosphorylation of ethanolamine. ... Phosphoethanolamine cytidylyltransferase, a key enzyme in the biosynthesis of cephalins; it catalyses the reaction of phosphoethanolamine and CTP to form CDP-ethanolamine and pyrophosphate. ... (05 Mar 2000) ...

phosphofructokinase
<enzyme> The pacemaker enzyme of glycolysis. Coverts fructose 6 phosphate to fructose 1,6 bisphosphate. A tetrameric allosteric enzyme that is sensitive to the ATP/ADP ratio. ... (18 Nov 1997) ...

phosphofructokinase phosphatase
<enzyme> May be an aspect of EC 3.1.3.16 ... Registry number: EC 3.1.3.- ... Synonym: pfk-inactivating enzyme ... (26 Jun 1999) ...

phosphogalactoisomerase
Synonym for udpglucose-hexose-1-phosphate uridylyltransferase ... <enzyme> An enzyme that catalyses the transfer of ump from udpglucose to galactose 1-phosphate, forming udpgalactose and glucose 1-phosphate. Deficiency in this enzyme is the major cause of galactosaemia. ... Chemical name: UDPglucose:alpha-D-galactose-1-phosphate uridylyltransfe …

phosphoglucokinase
<enzyme> An enzyme that, in the presence of ATP, catalyses the phosphorylation of d-glucose 1-phosphate to form d-glucose 1,6-bisphosphate and ADP; found in yeast and muscle; d-glucose 1,6-bisphosphate is a required cofactor of one of the enzymes in glycogenolysis. ... Synonym: glucose-1-phosphate kinase. ... (05 Mar 2000) ...

phosphoglucomutase
<enzyme> An enzyme that catalyses the conversion of alpha d-glucose 1-phosphate to alpha d-glucose-6-phosphate. ... Chemical name: alpha-D-Glucose 1,6-phosphomutase ... Registry number: EC 5.4.2.2 ... (12 Dec 1998) ...

phosphogluconate dehydrogenase
<enzyme> An enzyme of the oxidoreductase class that catalyses the reaction 6-phospho-d-gluconate and NADP+ to yield d-ribulose 5-phosphate, carbon dioxide, and NADPH. The reaction is a step in the pentose phosphate pathway of glucose metabolism. ... Chemical name: 6-Phospho-D-gluconate:NAD(P)+ 2-oxidoreductase ... Registry number: EC 1.1.1.43
phosphogluconate pathway
<biochemistry> This oxidative pathway starts with glucose-6-phosphate andeventually results in the creation of pentose phosphates and NADPH. ... (09 Oct 1997) ...

phosphoglucosamine mutase
<enzyme> Catalyses the interconversion of glucosamine-6-phosphate and glucosamine-1-phosphate isomers; femr315 isolated from staphylococcus aureus ... Registry number: EC 5.4.2.- ... Synonym: glmm gene product, femr315 gene product ... (26 Jun 1999) ...

phosphoglucose isomerase
<enzyme> In glycolysis, phosphoglucose isomerase is the enzyme responsible for the isomerisation of glucose-6-phosphate, an aldose, toFructose 6-phosphate, a ketose. ... (09 Oct 1997) ...

phosphoglyceracetals
Synonym for plasmalogens ... Generic term for glycerophospholipids in which the glycerol moiety bears a 1-alkenyl ether group (on rarer occasions, a 1-alkyl ether group); e.g., alk-1-enylglycerophospholipid; plasmalogens synthesis is reduced in disorders of the peroxisome. ... Synonym: phosphoglyceracetals. ... (05 Mar 2000) ...

phosphoglycerate
<biochemistry> The molecules 2 phosphoglycerate and 3 phosphoglycerate are intermediates in glycolysis. 3 phosphoglycerate is the precursor for synthesis of phosphatidic acid and diacyl glycerol, hence of phosphatidyl phospholipids. ... (31 Dec 1997) ...

phosphoglycerate dehydrogenase
<enzyme> Catalyses the oxidation of 3-phosphoglyceric acid to 3-phosphohydroxy pyruvate, which can be transaminated and then hydrolyzed to give serine; minor descriptor (75-85); on-line and index medicus search alcohol oxidoreductases (75-77) and carbohydrate dehydrogenases (78-85) ... Registry number: EC 1.1.1.95 ... Synonym: phosphoglycerate …

phosphoglycerate kinase
<enzyme> An enzyme catalyzing the transfer of a phosphate group from 3-phospho-d-glycerate in the presence of ATP to yield 3-phospho-d-glyceroyl phosphate and ADP. ... Chemical name: ATP-3-phospho-D-glycerate 1-phosphotransferase ... Registry number: EC 2.7.2.3 ... (12 Dec 1998) ...

phosphoglycerate mutase
<enzyme> An enzyme that catalyses the conversion of 2-phospho-d-glycerate to 3-phospho-d-glycerate. ... Chemical name: D-Phosphoglycerate 2,3-phosphomutase ... Registry number: EC 5.4.2.1 ... (12 Dec 1998) ...

phosphoglycerate permease
<chemical> ... (26 Jun 1999) ...

phosphoglyceric acid
1. HOCH2-CH(OH)CO-OPO3H2; glyceroyl phosphoric acid; glyceroyl phosphate;an acid anhydride between glyceric acid and phosphoric acid. ... 2. HOCH2-CH(OPO3H2) COOH; 2-phosphoglyceric acid;the deprotonated form, 2-phosphoglycerate, is an intermediate in glycolysis. ... 3. H2O3POCH2-CH (OH)COOH; 3-phosphoglyceric acid;the deprotonated form, 3-phosphogly …

phosphoglycerides
Acylglycerol and diacylglycerol phosphates;constituents of nerve tissue, and involved in fat transport and storage. ... (05 Mar 2000) ...

phosphoglyceromutase
An isomerizing enzyme catalyzing the reversible interconversion of 2-phosphoglycerate and 3-phosphoglycerate with 2,3-bisphosphoglycerate present as a cofactor; a deficiency of this enzyme, which plays a role in glycolysis, is an inherited disorder that results in an intolerance for strenuous exercise. ... (05 Mar 2000) ...

phosphoheptose isomerase
<enzyme> Sedoheptulose-7-p is converted to d-glycero-d-manno-heptulose ... Registry number: EC 5.3.1.- ... (26 Jun 1999) ...

phosphohexokinase
Synonym for 6-phosphofructokinase ... <enzyme> An enzyme that catalyses the conversion of a nucleotide triphosphate and a sugar phosphate to a nucleotide diphosphate and a sugar diphosphate. D-fructose 6-phosphate, d-tagatose 6-phosphate, and sedoheptulose 7-phosphate can act as acceptors; ATP, utp, ctp, and itp can act as donors. A deficiency …

phosphohexomutase
Synonym for glucose-phosphate isomerase ... <enzyme> An enzyme that catalyses the reversible interconversion of d-fructose 6-phosphate and d-glucose-6-phosphate; a part of glycolysis and gluconeogenesis; glucosephosphate isomerase deficiency is an inherited disorder resulting in liver glycogenesis and haemolytic anaemia. ... Synonym: hexosephos …

phosphohexose isomerase
Synonym for glucose-phosphate isomerase ... <enzyme> An enzyme that catalyses the reversible interconversion of d-fructose 6-phosphate and d-glucose-6-phosphate; a part of glycolysis and gluconeogenesis; glucosephosphate isomerase deficiency is an inherited disorder resulting in liver glycogenesis and haemolytic anaemia. ... Synonym: hexosephos …

phosphohexose isomerase deficiency
Synonym for glucosephosphate isomerase deficiency ... <enzyme> An enzyme deficiency characterised by chronic nonspherocytic haemolytic anaemia; autosomal recessive inheritance. ... Synonym: phosphohexose isomerase deficiency. ... (05 Mar 2000) ...

phosphohydrolases
Phosphoric monoester hydrolases;enzymes (EC sub-subclass 3.1.3) cleaving phosphoric acid (as orthophosphate) from its esters; trivial names usually end in phosphate. ... (05 Mar 2000) ...

phosphoinositide
Synonym for phosphatidylinositol ... <biochemistry> A phosphatidic acid combined with inositol found in biomembranes and a precursor to certain cellular signals. Sometimes referred to as inositide. ... It is a very important minor phospholipid in eukaryotes, involved in signal transduction processes. Contains myo inositol linked through the 1 h …

phosphokinase
A phosphotransferase or a kinase. ... (05 Mar 2000) ...

phospholamban kinase
<enzyme> A delta-cam kinase isozyme; catalyses the phosphorylation of phospholamban ... Registry number: EC 2.7.1.- ... Synonym: phospholamban sarcoplasmic reticulum calmodulin-dependent protein kinase, phospholamban srcam kinase ... (26 Jun 1999) ...

phospholamban phosphatase
<enzyme> Purified from canine cardiac cytosol; dephosphorylates pholamban; stimulated by mg+2, mn+2 or ca+2 ... Registry number: EC 3.1.3.- ... (26 Jun 1999) ...

phospholipase
<enzyme> That hydrolyse ester bonds in phospholipids. They comprise two types: aliphatic esterases (phospholipase A1, A2 and B) that release fatty acids and phosphodiesterases (types C and D) that release diacyl glycerol or phosphatidic acid respectively. ... Type A2 is widely distributed in venoms and digestive secretions. Types A1, A2 and C …

phospholipase A1
<enzyme> An enzyme that hydrolyzes a lecithin (1,2-diacylglycerophosphocholine) to a 2-acylglycerophosphocholine and a fatty acid anion. ... (05 Mar 2000) ...

phospholipase A2
<enzyme> An enzyme that catalyses the hydrolysis of a lecithin to a lysolecithin by removing the 2-acyl group; also acts on other phospholipids by removing a fatty acid from the 2-position; this enzyme has an important role in prostaglandin and leukotriene biosynthesis. ... Synonym: lecithinase A, phosphatidase, phosphatidolipase. ... (05 Mar 2 …

phospholipase B
There are reports that phospholipase B is a mixture of phospholipase A1 and phospholipase A2. ... See: lysophospholipase. ... (05 Mar 2000) ...

phospholipase c
<enzyme> An enzyme found in the alpha-toxin of clostridium welchii and other strains of clostridia and bacilli. It hydrolyzes glycerophosphatidates with the formation of 1,2-diacylglycerol and a phosphorylated nitrogenous base such as choline. ... Chemical name: Phosphatidylcholine cholinephosphohydrolase ... Registry number: EC 3.1.4.3 ... (12 …

phospholipase d
<enzyme> An enzyme found mostly in plant tissue. It hydrolyzes glycerophosphatidates with the formation of a phosphatidic acid and a nitrogenous base such as choline. This enzyme also catalyses transphosphatidylation reactions. ... Chemical name: Phosphatidylcholine phosphatidohydrolase ... Registry number: EC 3.1.4.4 ... (12 Dec 1998) ...

phospholipases
<enzyme> A class of enzymes that catalyze the hydrolysis of phosphoglycerides or glycerophosphatidates. ... Registry number: EC 3.1.- ... (12 Dec 1998) ...

phospholipases a
<enzyme> Phosphatide acylhydrolases. Catalyze the hydrolysis of one of the acyl groups of phosphoglycerides or glycerophosphatidates. Phospholipase a1 hydrolyzes the acyl group attached to the 1-position (ec 3.1.1.32) and phospholipase a2 hydrolyzes the acyl group attached to the 2-position (ec 3.1.1.4). ... Registry number: EC 3.1.1.- ... (12 …

phospholipid
<biochemistry> The major structural lipid of most cellular membranes (except the chloroplast which has galactolipids). Contain phosphate, usually as a diester. ... Examples include phosphatidyl phospholipids, plasmalogens and sphingomyelins. ... (18 Nov 1997) ...

phospholipid bilayer
<biochemistry> A lamellar organisation of phospholipids that are packed as a bilayer with hydrophobic acyl tails inwardly directed and polar head groups on the outside surfaces. ... It is this bilayer that forms the basis of membranes in cells, though in most cellular membranes a very substantial proportion of the area may be occupied by integ …

phospholipid ethers
Phospholipids which have an alcohol moiety in ethereal linkage with a saturated or unsaturated aliphatic alcohol. They are usually derivatives of phosphoglycerols or phosphatidates. The other two alcohol groups of the glycerol backbone are usually in ester linkage. These compounds are widely distributed in animal tissues. ... (12 Dec 1998) ...

phospholipid syndrome
<syndrome> The combination of antiphospholipid antibodies and the presence of either arterial or venous occlusive events such as thrombosis. ... (05 Mar 2000) ...

phospholipid transfer protein
<protein> Cytoplasmic proteins that bind phospholipids and facilitate their transfer between cellular membranes. May also cause net transfer from the site of synthesis. ... (18 Nov 1997) ...

phospholipids
Lipids containing one or more phosphate groups, particularly those derived from either glycerol (phosphoglycerides see glycerophosphates) or sphingosine (sphingolipids). They are polar lipids that are of great importance for the structure and function of cell membranes and are the most abundant of membrane lipids, although not stored in large amoun …

phosphomannomutase
<enzyme> Catalyses reversibly the conversion of d-mannose 1-phosphate to d-mannose 6-phosphate; encoded by algc gene in pseudomonas aeruginosa; rfbk has similarity to acyl carrier proteins ... Registry number: EC 5.4.2.8 ... Synonym: algc protein, rfbk gene product, rfbk protein, pmma gene product, pmm2 gene product, pmm1 gene product ... (26 Ju …

phosphomannose
Synonym for mannose-6-phosphate ... <biochemistry> Mannose derivative formed by phosphorylation in the Golgi complex of certain mannose residues on N glycan chains of lysosomal enzymes. ... Believed to function as targetting signal that causes entry of these enzymes to the lysosomes. The receptor (215 kD) is enriched in specialised pre lysosome …

phosphomevalonate kinase
<enzyme> Chemical name: mevalonate-5-phosphate kinase ... Registry number: EC 2.7.4.2 ... Synonym: mvap kinase, mevalonate 5-phosphate kinase ... (26 Jun 1999) ...

phosphomutase
One of a number of enzymes (mutases) (EC sub-subclass 5.4.2) that apparently catalyze intramolecular transfer because the donor is regenerated (e.g., phosphoglyceromutase, phosphoglucomutase). ... Synonym: phosphodismutase. ... (05 Mar 2000) ...

phosphonate esterase
<enzyme> Hydrolyzes 4-nitrophenyl phenylphosphonate to yield 4-nitrophenol and phenylphosphonic acid ... Registry number: EC 3.11.1.- ... (26 Jun 1999) ...

phosphonate monoester hydrolase
<enzyme> Hydrolyzes glyceryl glyphosate to glyphosate; isolated from burkholderia caryophilli; genbank u44852 ... Registry number: EC 3.1.- ... Synonym: peh enzyme, glyceryl glyphosate hydrolase ... (26 Jun 1999) ...

phosphonecrosis
Necrosis of the osseous tissue of the jaw, as a result of poisoning by inhalation of phosphorus fumes, occurring especially in persons who work with the element. ... Origin: phosphorus + G. Nekrosis, death (necrosis) ... (05 Mar 2000) ...

phosphonic acids
Inorganic or organic derivatives of phosphonic acid with the general formula rop(oh)2. This includes phosphonates and phosphonic acid esters. The tautomeric form of this compound (p(oh)3) = phosphorous acids. ... (12 Dec 1998) ...

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) ...

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
Synonym for ribose-5-phosphate 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) ...

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) ...

phosphorated
Forming a compound with phosphorus. ... (05 Mar 2000) ...

phosphorescence
1. <chemistry> Emission of light following absorption of radiation. Emitted light is of longer wavelength than the exciting radiation and is a result of decay of electrons from the triplet to the ground state. Lasts longer than fluorescence electron decay from singlet to ground state) and occurs after a longer delay. ... 2. <biology> Pop …

phosphorescent
Having the property of phosphorescence. ... (05 Mar 2000) ...

phosphorhidrosis
The excretion of luminous sweat. ... Synonym: phosphoridrosis. ... Origin: G. Phos, light, + phoros, bearing, + hidrosis, sweating ... (05 Mar 2000) ...

phosphoriboisomerase
Synonym for ribose-5-phosphate 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) ...