| 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) |
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| 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 rate-limiting step of lecithin biosynthesis; the cytosolic form of the enzyme is inactive (a phosphorylated form of the enzyme). Phosphocholine diacylglycerol transferase, an enzyme in lecithin biosynthesis that catalyses the reaction of 1,2-diacylglycerol with CDP-choline to form CMP and phosphatidylcholine. (05 Mar 2000) |
| 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 | 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) |
| phosphodiesterase-phosphomonoesterase | <enzyme> From fusarium moniliforme; hydrolyzes both phosphodiesters and phosphomonoesters Registry number: EC 3.1.- Synonym: pdmase (26 Jun 1999) |
| 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) |
| phosphodimethylethanolamine N-methyltransferase | <enzyme> Final step in the sequential methylation of phosphoethanolamine to phosphocholine Registry number: EC 2.1.1- Synonym: pme2etn methyltransferase (26 Jun 1999) |
| phosphodismutase | 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) |
Synonyms : PLC gamma1, PLC-gamma, PLC-gamma 2, PLC-gamma D, PLCgamma2, Phospholipase C gamma 1, Phospholipase C gamma 2, Phospholipase C gamma D, Phospholipase C gamma1, Phospholipase C gamma2, Phospholipase C gammaD, PLC gamma, PLC gamma 2, PLC gamma D
Synonyms : Phosphatidylcholine Phosphohydrolase
Synonyms : Lecithinase, Phospholipase
Synonyms : Phosphatidate 1-Acylhydrolase, 1-Acylhydrolase, Phosphatidate, A, Phospholipases, A1, Lecithinase, A1, Phospholipase, A2, Lecithinase, A2, Phospholipase, Phosphatidate 1 Acylhydrolase
Synonyms : 1-Alkyl-2-Acylphosphatidates, 1 Alkyl 2 Acylphosphatidates, Ethers, Glycerol Phosphate, Ethers, Glycerophosphate, Ethers, Phospholipid, Phosphate Ethers, Glycerol, Phosphatidates, Ether, Phospholipids, Ether
| photophobia |
a morbid fear of light photalgia: pain in the eye resulting from exposure to bright light (often associated with albinism)
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| photopic vision |
daylight vision: normal vision in daylight; vision with sufficient illumination that the cones are active and hue is perceived
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| phon- |
a unit of subjective loudness
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| phonate |
vocalize: utter speech sounds
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| phonetic |
of or relating to speech sounds; "phonetic transcription"
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| PHO | an occasion that lends itself to (or is deliberately arranged for) taking photographs that provide favorable publicity for those who are photographed |
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| PHO | an occasion that lends itself to (or is deliberately arranged for) taking photographs that provide favorable publicity for those who are photographed |
| PHO | a method of offset printing using photomechanical plates |
| PHO | a method of offset printing using photomechanical plates |
| PHO | a genus of fish in the family Anomalopidae |
| PHO | fish of deep dark waters having a light organ below each eye |
| PHO | a cathode that emits electrons when illuminated |
| PHO | a transducer used to detect and measure light and other radiations |
| PHO | of or relating to or produced by the effects of light on chemical systems |
| PHO | an exchange produced by the chemical action of radiant energy (especially light) |
| PHO | a chemical reaction produced by the action of light |
| PHO | branch of chemistry that deals with the chemical action of light |