| phos- | Light. Origin: G. Phos (05 Mar 2000) |
|---|---|
| phosducin | <protein> Protein (33 kD) that inhibits Gs GTPase activity (a GIP). Isolated from bovine brain and found in retina, pineal gland and many other tissues. Activity of phosducin is inhibited if phosphorylated by a cAMP dependent protein kinase. (18 Nov 1997) |
| phosgene | <chemistry> Producing, or produced by, the action of light; formerly used specifically to designate a gas now called carbonyl chloride. See Carbonyl. Origin: Gr. Light + the root of to be born: cf. F. Phosgene. Source: Websters Dictionary (01 Mar 1998) |
| phosgenite | <chemical> A rare mineral occurring in tetragonal crystals of a white, yellow, or grayish colour and adamantine luster. It is a chlorocarbonate of lead. Source: Websters Dictionary (01 Mar 1998) |
| phosmet | <chemical> S-((1,3-dihydro-1,3-dioxo-2h-isoindol-2-yl)methyl)phosphorodithioic acid o,o-dimethyl ester. An organothiophosphorus insecticide that has been used to control pig mange. Pharmacological action: insecticide, organothiophosphate. Chemical name: Phosphorodithioic acid, S-((1,3-dihydro-1,3-dioxo-2H-isoindol-2-yl)methyl) O,O-dimethyl ester (12 Dec 1998) |
| phosph- | Phospho-phosphor-phosphoro- <prefix> Prefixes indicating the presence of phosphorus in a compound.See phospho-for specific usage of that prefix. Origin: G. Phos, light; phoros, carrying (05 Mar 2000) |
| phosphagen | Energy-rich guanidinium or amidine phosphate, serving as an energy store in muscle and brain; e.g., phosphocreatine in mammals, phosphoarginine in invertebrates. (05 Mar 2000) |
| phosphagenic | Phosphate-producing. (05 Mar 2000) |
| phospham | <chemistry> An inert amorphous white powder, PN2H, obtained by passing ammonia over heated phosphorus. [Spelt also phosphame] Phos"pham"ic. Origin: Phosphorus + ammonia. Source: Websters Dictionary (01 Mar 1998) |
| phosphamic acid | R-NH-PO3H2, one of the three types of high energy phosphates (the others being phosphophosphoric acids and phosphosulfuric acids). (05 Mar 2000) |
| phosphamidase | <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) |
| phosphamidon | <chemical> An organophosphate cholinesterase inhibitor that is used as an insecticide. Pharmacological action: cholinesterase inhibitor, insecticide, organophosphate. Chemical name: Phosphoric acid, 2-chloro-3-(diethylamino)-1-methyl-3-oxo-1-propenyl dimethyl ester (12 Dec 1998) |
| phosphastat | A conceptual mechanism whereby the parathyroid hormone is increased when the levels of phosphorus rise to an above-normal level; there is as yet no satisfactory evidence for its existence. Origin: phosphate + L. Status, a standing (05 Mar 2000) |
| phosphatase | <enzyme> That hydrolyse phosphomonoesters. Acid phosphatases are specific for the single charged phosphate group and alkaline phosphatases for the double charged group. These specificities do not overlap. The phosphatases comprise a very wide range of enzymes including broad and narrow specificity members. Phosphoprotein phosphatases specifically de phosphorylate a particular protein and are essential if phosphorylation is to be used as a reversible control system. (31 Dec 1997) |
| phosphatase unit | See: Bodansky unit, King unit. (05 Mar 2000) |