| phosphatidylcholines | <biochemistry> Derivatives of phosphatidic acids in which the phosphoric acid is bound in ester linkage to a choline moiety. Complete hydrolysis yields 1 mole of glycerol, phosphoric acid and choline and 2 moles of fatty acids. (12 Dec 1998) |
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| phosphatidylethanolamine | <biochemistry> A major structural phospholipid in mammalian systems. Tends to be more abundant than phosphatidylcholine in the internal membranes of the cell and is an abundant component of prokaryotic membranes. Ethanolamine is attached to phosphatidic acid by a phosphodiester linkage. Synthesis from diacyl glycerol and CDP-ethanolamine. The condensation product of a phosphatidic acid and ethanolamine; found in biomembranes. See: cephalin. (05 Mar 2000) |
| phosphatidylethanolamine cytidylyltransferase | <enzyme> A key enzyme in the biosynthesis of cephaline. It catalyses the reaction of phosphoethanolamine and CTP to form CDP-ethanolamine and pyrophosphate. (05 Mar 2000) |
| phosphatidylethanolamine N-acyltransferase | <enzyme> Transfers acyl groups from sn-1 position of membrane phospholipids to the amino group of ethanolamine phospholipids Registry number: EC 2.3.1- Synonym: penatfase, n-acylphosphatidylethanolamine synthase, nape synthase (26 Jun 1999) |
| phosphatidylethanolamine-ceramide phosphoethanolamine transferase | <enzyme> Cdpethanolamine is not a donor; involved in sphingomyelin synthesis Registry number: EC 2.7.8.- Synonym: pe-cer-pet transferase (26 Jun 1999) |
| phosphatidylethanolamine-dolichol acyltransferase | <enzyme> Forms dolichyl oleate from dioleoyl phosphatidylethanolamine Registry number: EC 2.3.1.- Synonym: pe - dolichol acyltransferase, dolichol acyltransferase (26 Jun 1999) |
| phosphatidylethanolamines | <biochemistry> Derivatives of phosphatidic acids in which the phosphoric acid is bound in ester linkage to an ethanolamine moiety. Complete hydrolysis yields 1 mole of glycerol, phosphoric acid and ethanolamine and 2 moles of fatty acids. (12 Dec 1998) |
| phosphatidylglycerol | <biochemistry> A phosphatidic acid in which a second glycerol molecule replaces the usual choline, or ethanolamine or serine; a constituent in human amniotic fluid that denotes foetal lung maturity when present in the last trimester. (05 Mar 2000) |
| phosphatidylglycerol - membrane-oligosaccharide glycerophosphotransferase | <enzyme> Transfers phosphoglycerol residues from phosphatidylglycerol to membrane-derived oligosaccharides of E coli Registry number: EC 2.7.8.20 Synonym: phosphoglycerol transferase I, phosphoglyceroltransferase, phosphoglycerol transferase (26 Jun 1999) |
| phosphatidylglycerol glyceryl transferase | <enzyme> Converts prolipoprotein to glyceryl-prolipoprotein in E coli murein-lipoprotein biosynthetic pathway Registry number: EC 2.4.99.- Synonym: glyceryltransferase, phosphatidylglycerol - prolipoprotein diacylglyceryl transferase, umpa gene product, e. Coli, prolipoprotein diacylglyceryl transferase, lgt gene product (26 Jun 1999) |
| phosphatidylglycerols | <biochemistry> A nitrogen-free class of lipids present in animal and particularly plant tissues and composed of one mole of glycerol and 1 or 2 moles of phosphatidic acid. Members of this group differ from one another in the nature of the fatty acids released on hydrolysis. (12 Dec 1998) |
| 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 hydroxyl group to phosphatidic acid. The 4 phosphate (PIP) and 4, 5 bisphosphate derivatives PIP2) are formed and broken down in membranes by the action of specific kinases and phosphatases (futile cycles). Signal sensitive phospholipase C enzymes remove the inositol moiety, in particular from 1,4,5 trisphosphate (PIP2) as inositol 1,4,5 triphosphate (Ins P3: IP3). Both the diacyl glycerol and products act as second messengers. Synonym: phosphoinositide. (20 Sep 2002) |
| phosphatidylinositol 4,5-bisphosphate | <biochemistry> This is a molecule of phosphatidylinositol with two additional sites of phosphorylation. It is an important constituent of cell membrane phospholipids as well as a precursor of the second messengers, diacylglycerol and inositol 1,4,5-trisphosphate. Acronym: PIP2 (20 Sep 2002) |
| phosphatidylinositol 4,5-bisphosphate kinase | <enzyme> Membrane-associated enzyme Registry number: EC 2.7.1.- Synonym: ptdins 4,5-p2 kinase, phosphatidylinositol 4,5-bisphosphate kinase, ptdins(4,5)p2 3oh-kinase (26 Jun 1999) |
| phosphatidylinositol 4,5-diphosphate | <biochemistry> A phosphoinositide present in all eukaryotic cells, particularly in the plasma membrane. It is the major substrate for receptor-stimulated phosphoinositidase c, with the consequent formation of inositol 1,4,5-triphosphate and diacylglycerol, and probably also for receptor-stimulated inositol phospholipid 3-kinase. (12 Dec 1998) |
Synonyms : GTP-Dependent Phosphoenolpyruvate Carboxykinase, Carboxykinase, GTP-Dependent Phosphoenolpyruvate, GTP Dependent Phosphoenolpyruvate Carboxykinase, Phosphoenolpyruvate Carboxykinase, GTP-Dependent
Synonyms : Carboxylase, Phosphoenolpyruvate
Synonyms : Phosphoenolpyruvate-Glycose Phosphotransferase System, Hexose Phosphotransferases, Phosphoenolpyruvate, Phosphoenolpyruvate Glycose Phosphotransferase System, Phosphotransferase System, Phosphoenolpyruvate-Glycose
Synonyms : 6-Phosphofructo-1-kinase, Fructose-6-P 1-Kinase, Fructose-6-phosphate 1-Phosphotransferase, 6 Phosphofructokinase, Phosphofructokinase 1
Synonyms : Phosphofructo-1-kinase Isozyme B, Phosphofructokinase 1, Liver Type
| photometry |
measurement of the properties of light (especially luminous intensity)
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| photomicrograph |
a photograph taken with the help of a microscope
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| phoneme |
(linguistics) one of a small set of speech sounds that are distinguished by the speakers of a particular language
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| phobic neurosis |
phobia: an anxiety disorder characterized by extreme and irrational fear of simple things or social situations; "phobic disorder is a general term for all phobias"
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| phonetics |
the branch of acoustics concerned with speech processes including its production and perception and acoustic analysis
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| PHO | the study of the sound system of a given language and the analysis and classification of its phonemes |
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| PHO | a person who professes beliefs and opinions that they do not hold |
| PHO | fraudulent |
| PHO | any of various American parasitic plants similar to Old World mistletoe: false mistletoe |
| PHO | the traditional mistletoe of Christmas in America: grows on deciduous trees and can severely weaken the host plant |
| PHO | the traditional mistletoe of Christmas in America: grows on deciduous trees and can severely weaken the host plant |
| PHO | hermaphrodite wormlike animal living in mud of the sea bottom |
| PHO | small phylum of wormlike marine animals |
| PHO | small phylum of wormlike marine animals |
| PHO | a colorless poisonous gas that smells like new-mown hay |
| PHO | any of a group of enzymes that act as a catalyst in the hydrolysis of organic phosphates |
| PHO | carbonated drink with fruit syrup and a little phosphoric acid |