| phosphatidylinositols | <biochemistry> Derivatives of phosphatidic acids in which the phosphoric acid is bound in ester linkage to the hexahydroxy alcohol, myo-inositol. Complete hydrolysis yields 1 mole of glycerol, phosphoric acid, myo-inositol, and 2 moles of fatty acids. (12 Dec 1998) |
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| phosphatidylserine | <biochemistry> The condensation product of phosphatidic acid and serine, found in biomembranes. It is an important minor species of phospholipid in membranes. Serine is attached to phosphatidic acid by a phosphodiester linkage. Complete hydrolysis yields 1 mole of glycerol, phosphoric acid and serine and 2 moles of fatty acids. Synthesis is from phosphatidylethanolamine by exchange of ethanolamine for serine. Distribution is asymmetric, as the molecule is only present on the cytoplasmic side of cellular membranes. It is negatively charged at physiological pH and interacts with divalent cations, involved in calcium dependent interactions of proteins with membranes (e.g. Protein kinase C). See: cephalin. (20 Sep 2002) |
| phosphaturia | <nephrology> The excessive discharge of phosphates in the urine. Origin: NL. See Phosphate, and Urine. (01 Mar 1998) |
| phosphene | <ophthalmology, physiology> Visual sensations arising from mechanical stimulation by pressure upon the eyeball when the lids are closed. It can also be produced by electrical stimulation of the eyeball. It is a luminous impression produced through excitation of the retina by some cause other than the impingement upon it of rays of light. Origin: Gr. Light + to show. (20 Sep 2002) |
| phosphide | <chemistry> A binary compound of phosphorus. Source: Websters Dictionary (01 Mar 1998) |
| phosphine | <chemistry> A colourless gas, PH3, analogous to ammonia, and having a disagreeable odour resembling that of garlic. Synonym: hydrogen phosphide, and formerly, phosphureted hydrogen. It is the most important compound of phosphorus and hydrogen, and is produced by the action of caustic potash on phosphorus. It is spontaneously inflammable, owing to impurities, and in burning produces peculiar vortical rings of smoke. Source: Websters Dictionary (01 Mar 1998) |
| phosphines | Inorganic or organic compounds derived from phosphine (ph3) by the replacement of h atoms. (12 Dec 1998) |
| phosphinic | <chemistry> Pertaining to, or designating, certain acids analogous to the phosphonic acids, but containing two hydrocarbon radicals, and derived from the secondary phosphines by oxidation. Source: Websters Dictionary (01 Mar 1998) |
| 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) |
| phosphite | <chemistry> A salt of phosphorous acid. Source: Websters Dictionary (01 Mar 1998) |
| 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-2-keto-3-deoxy-gluconate aldolase | <enzyme> Minor descriptor (75-84); on-line and index medicus search aldehyde-lyases (75-84) Registry number: EC 4.1.2.14 Synonym: 2-keto-3-deoxy-6-phosphogluconate aldolase, 6-phospho-2-keto-3-deoxy-d-gluconate d-glyceraldehyde-3-phosphate-lyase, kdpga (26 Jun 1999) |
| phospho-3-hexuloisomerase | <enzyme> Chemical name: d-arabino-3-hexulose 6-phosphate 3,2-ketoisomerase Registry number: EC 5.3.1.- (26 Jun 1999) |