| pyribenzyl methyl sulfate | 2-(hydroxymethyl)-1,1-dimethylpiperidinium methyl sulfate benzylate;an anticholinergic agent. Synonym: pyribenzyl methyl sulfate. (05 Mar 2000) |
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| pyridic | <physiology> Related to, or formed from, pyridin or its homologues; as, the pyridic bases. Source: Websters Dictionary (01 Mar 1998) |
| pyridine | <physiology> A nitrogenous base, C5H5N, obtained from the distillation of bone oil or coal tar, and by the decomposition of certain alkaloids, as a colourless liquid with a peculiar pungent odour. It is the nucleus of a large number of organic substances, among which several vegetable alkaloids, as nicotine and certain of the ptomaines, may be mentioned. See Lutidine. Origin: From Gr. Fire. Source: Websters Dictionary (01 Mar 1998) |
| pyridinolcarbamate | <chemical> A drug that has been given by mouth in the treatment of atherosclerosis and other vascular disorders, hyperlipidemias, and thrombo-emoblytic disorders. Pharmacological action: antilipaemic agents, fibrinolytic agent. Chemical name: 2,6-Pyridinedimethanol, bis(methylcarbamate) (ester) (12 Dec 1998) |
| pyridofylline | 7-(2-Hydroxyethyl)theophylline hydrogen sulfate compound with pyridoxol; a coronary vasodilator. (05 Mar 2000) |
| pyridones | Pyridine derivatives with one or more keto groups on the ring. (12 Dec 1998) |
| pyridostigmine bromide | <chemical> A cholinesterase inhibitor with a slightly longer duration of action than neostigmine. It is used in the treatment of myasthenia gravis and to reverse the actions of muscle relaxants. Pharmacological action: cholinesterase inhibitor, parasympathomimetic. Chemical name: Pyridinium, 3-(((dimethylamino)carbonyl)oxy)-1-methyl-, bromide (12 Dec 1998) |
| pyridoxal | <chemical> 3-hydroxy-5-(hydroxymethyl)-2-methyl-4- pyridinecarboxaldehyde. Chemical name: 4-Pyridinecarboxaldehyde, 3-hydroxy-5-(hydroxymethyl)-2-methyl- (12 Dec 1998) |
| pyridoxal kinase | <enzyme> An enzyme that catalyses reversibly the phosphorylation of pyridoxal in the presence of ATP with the formation of pyridoxal 5-phosphate and ADP. Pyridoxine, pyridoxamine and various derivatives can also act as acceptors. Chemical name: ATP:pyridoxal 5-phosphotransferase Registry number: EC 2.7.1.35 (12 Dec 1998) |
| pyridoxal phosphate | <enzyme> The co-enzyme derivative of vitamin B6. Forms Schiff's bases of substrate amino acids during catalysis of transamination, decarboxylation and racemisation reactions. (18 Nov 1997) |
| pyridoxamine | <chemical> Chemical name: 3-Pyridinemethanol, 4-(aminomethyl)-5-hydroxy-6-methyl- (12 Dec 1998) |
| pyridoxaminephosphate oxidase | <enzyme> An oxidoreductase enzyme catalyzing the oxidative deamination of pyridoxamine 5'-phosphate (with O2 and H2O) to pyridoxal phosphate. It is a flavoprotein that also oxidises pyridoxine-5-phosphate and pyridoxine. Chemical name: Pyridoxamine 5'-phosphate:oxygen oxidoreductase (deaminating) Registry number: EC 1.4.3.5 (12 Dec 1998) |
| pyridoxic acid | <chemical> Chief metabolic product of pyridoxine, pyridoxal, and pyridoxamine in urine. Chemical name: 4-Pyridinecarboxylic acid, 3-hydroxy-5-(hydroxymethyl)-2-methyl- (12 Dec 1998) |
| pyridoxine | <biochemistry> Member of the water soluble B vitamin group. Vitamin B6 or pyridoxine, is active in the metabolism of proteins, carbohydrates and fats. It is also a necessary part of haemoglobin synthesis. B6 deficiency results in retarded growth and a peripheral neuropathy. (27 Sep 1997) |
| pyridoxine 4-dehydrogenase | <enzyme> Chemical name: dehydrogenase, pyridoxol 4- Registry number: EC 1.1.1.65 Synonym: pyridoxine phosphate dehydrogenase, pyridoxal reductase (26 Jun 1999) |