| 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) |
| pyridoxine deficiency | A nutritional condition produced by a deficiency of pyridoxine in the diet, characterised by dermatitis, glossitis, cheilosis, and stomatitis. Marked deficiency causes irritability, weakness, depression, dizziness, peripheral neuropathy, and seizures. In infants and children typical manifestations are diarrhoea, anaemia, and seizures. Increasingly recognised as a cause is prolonged therapy with certain medications, among them isoniazid, cycloserine, and l-dopa. (12 Dec 1998) |
| pyridoxine dependency with seizure | An inherited disorder (autosomal recessive) apparently associated with deficient brain type I glutamate decarboxylase; seizures can be controlled with vitamin B6. (05 Mar 2000) |
| pyridoxine phosphate phosphatase | <enzyme> Involved in metabolism of vitamin b(6) Registry number: EC 3.1.3.- Synonym: pyridoxal phosphate phosphatase, pyridoxamine phosphate phosphatase, pyridoxal-p hydrolase, pyridoxamine-p hydrolase, vitamin b(6)-phosphate phosphatase (26 Jun 1999) |
| pyridyl | <chemistry> A hypothetical radical, C5H4N, regarded as the essential residue of pyridine, and analogous to phenyl. Origin: Pyridine + -yl. Source: Websters Dictionary (01 Mar 1998) |