| phosphoribosyltransferase | One of a group of enzymes (EC sub-subclass 2.4.2, pentosyltransferases) that transfers d-ribose 5-phosphate from 5-phospho-alpha-d-ribosyl pyrophosphate to a purine, pyrimidine, or pyridine acceptor, forming a 5'-nucleotide and inorganic pyrophosphate, or d-ribose from d-ribosyl phosphate to a base, forming a nucleoside, or similar pentose transfers; important in nucleotide biosynthesis. Specific phosphoribosyltransferases are preceded by the name of the acceptor base, e.g., uracil phosphoribosyltransferase (i.e., uracil + PRPP &dblarr; UMP + pyrophosphate). (05 Mar 2000) |
|---|---|
| phosphoribulokinase | <enzyme> An enzyme that, in the presence of ATP, catalyses the phosphorylation of d-ribulose 5-phosphate to d-ribulose 1,5-bisphosphate and ADP, a reaction of importance in the carbon dioxide fixation cycle of photosynthesis. (05 Mar 2000) |
| phosphoribulose epimerase | ribulose-phosphate 3-epimerase |
| phosphoric | 1. (Chem) Of or pertaining to phosphorus; resembling, or containing, from us; specifically, designating those compounds in which phosphorus has a higher valence as contrasted with the phosphorous compounds. 2. Phosphorescent. "A phosphoric sea." Glacial phosphoric acid. <chemistry> Phosphoric acid changed from acid (soluble) salts back to neutral or basic (insoluble) salts. Origin: Cf. F. Phosphorique. Source: Websters Dictionary (01 Mar 1998) |
| phosphoric acid | O==P(OH)3; Orthophosphoric acid;a strong acid of industrial importance; m.p. 42.35캜; dilute solutions have been used as urinary acidifiers and as dressings to remove necrotic debris. In dentistry, it comprises about 60% of the liquid used in zinc phosphate and silicate cements; solutions are used for conditioning enamel surfaces prior to applications of various types of resins. (05 Mar 2000) |
| phosphoric acid esters | Organic esters of phosphoric acid. (12 Dec 1998) |
| phosphoric acids | Inorganic derivatives of phosphoric acid (h3po4). Inorganic salts are known as phosphates and organic esters are phosphoric acid esters. (12 Dec 1998) |
| phosphoric diester hydrolases | <enzyme> A class of enzymes that catalyze the hydrolysis of one of the two ester bonds in a phosphodiester compound. Registry number: EC 3.1.4 (12 Dec 1998) |
| phosphoric monoester hydrolases | <enzyme> A group of hydrolases which catalyze the hydrolysis of monophosphoric esters with the production of one mole of orthophosphate. Registry number: EC 3.1.3 (12 Dec 1998) |
| phosphorical | <chemistry> Phosphoric. Source: Websters Dictionary (01 Mar 1998) |
| phosphoridrosis | The excretion of luminous sweat. Synonym: phosphoridrosis. Origin: G. Phos, light, + phoros, bearing, + hidrosis, sweating (05 Mar 2000) |
| phosphorised | Containing phosphorus. (05 Mar 2000) |
| phosphorism | Chronic poisoning with phosphorus. (05 Mar 2000) |
| phosphoritic | <chemical> Pertaining to phosphorite; resembling, or of the nature of, phosphorite. Source: Websters Dictionary (01 Mar 1998) |
| phosphoroclastic cleavage | <biochemistry> This reaction is an analogue to hydrolysis, except here a molecule is cleaved with phosphate as the attacking group. (09 Oct 1997) |