| glacial phosphoric acid | An anhydride of phosphoric acid used as a reagent, and in the manufacture of zinc oxyphosphate cement for dentistry. Synonym: metaphosphoric acid. (05 Mar 2000) |
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| glacial | 1. Pertaining to ice or to its action; consisting of ice; frozen; icy; especially, pertaining to glaciers; as, glacial phenomena. 2. <chemistry> Resembling ice; having the appearance and consistency of ice; said of certain solid compounds; as, glacial phosphoric or acetic acids. <chemistry> Glacial acid See Glacier theory, under Glacier. Origin: L. Glacialis, from glacies ice: cf. F. Glacial. Source: Websters Dictionary (01 Mar 1998) |
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| 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) |
| cyclic phosphoric acid | In general, a linear polymer of phosphoric acid residues in pyrophosphate linkage in which the a and ω residues are similarly linked to make one endless loop or cyclic compound, specifically, a generic term applied to compounds in which one phosphoric acid residue is esterified to two hydroxyl groups of a single carbon chain, as in adenosine 3',5'-phosphoric acid, adenosine 2',3'-phosphoric acid, etc. (05 Mar 2000) |
| dilute phosphoric acid | A solvent containing 10% H3PO4. (05 Mar 2000) |
| acetic phosphoric anhydride | CH3CO-OPO32-;a "high energy" phosphate that acts as an acetate donor in the metabolism of various bacteria. Synonym: acetic phosphoric anhydride. (05 Mar 2000) |
| 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 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) |
| Rambourg's chromic acid-phosphotungstic acid stain | <technique> A stain for glycoproteins, used with an electron microscope, with which ultrathin tissue sections reveal complex carbohydrates in the same locations as shown by Rambourg's periodic acid-chromic methenamine-silver stain. (05 Mar 2000) |
| a1-acid glycoprotein | <biology> Plasma protein of mammals and birds, 38% carbohydrate. In humans a single chain glycoprotein of 39 kD. Increased levels are associated with inflammation, pregnancy and various diseases. (18 Nov 1997) |
| abscisic acid | <biochemistry> A lipid hormone that inhibits cell growth in plants, it is associated with fruit drop, leaf death and seed dormancy. It is synthesised in the plastids from carotenoids. This hormone helps plants deal with water loss, and its effects can be reversed with gibberellins. (06 May 1997) |
| abscisic acid 8'-hydroxylase | <enzyme> Catalyses conversion of abscisic acid to 8'-hydroxyabscisic acid, which rearranges to phaseic acid Registry number: EC 1.14.99.- Synonym: aba 8'-hydroxylase (26 Jun 1999) |
| acetic acid | <chemical> The acid most commonly associated with vinegar, it is the most commercially important organic acid and is used to manufacture a wide range of chemical products, such as plastics and Acetobacter but, except for making vinegar, is usually made through synthetic processes. Derivatives of acetic acid which may be formed by substitution reactions. Mono- and di-substituted, as well as, halogenated compounds have been synthesised. Experimentally, alpha- and n2- substituted acetic acids have been examined for their anti-inflammatory activity and effect on the central nervous system respectively. Additionally, limited exposure data has been collected on dibromo and dichloroacetic acids to determine whether they pose health effects. Synonym: ethanoic acid. (26 Jun 1999) |