| 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) |
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| 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) |
| phosphate | <chemistry> A salt of phosphoric acid. Source: Websters Dictionary (01 Mar 1998) |
| 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) |
| phosphate diabetes | Excessive secretion of phosphate in the urine due to a defect in tubular reabsorption; usually part of a more generalised abnormality, such as Fanconi syndrome. (05 Mar 2000) |
| phosphate group | <chemistry> A phosphate group on a larger molecule, where the phosphorus is single bonded to each of the four oxygens, and the other bond of one of the oxygens is attached to the rest of the molecule. This means that the entire group has a net negative charge of -3 (from the free second bonds on the oxygen atoms which are only bonded to the phosphorus atom). Often hydrogen atoms will be attached to the oxygens and sometimes double bonds between the phosphorus and an oxygen are present. (31 Dec 1997) |
| phosphate permease | <chemical> Isolated from van+ gene of neurospora crassa; transports vanadate Chemical name: permease, phosphate Synonym: permease, phosphate, pho4 gene product, pho5 gene product (26 Jun 1999) |
| phosphate tetany | Tetany due to the ingestion of an excess of alkaline phosphates (Na2HPO4 or K2HPO4); most commonly produced experimentally in animals by the injection of alkaline phosphate, which reduces the ionised calcium of the blood. (05 Mar 2000) |
| phosphated | Containing phosphates. (05 Mar 2000) |
| phosphatemia | An abnormally high concentration of inorganic phosphates in the blood. Origin: phosphate + G. Haima, blood (05 Mar 2000) |