| pyrrolidone | 2-Pyrrolidinone; 2-ketopyrrolidine; 2-oxopyrrolidine;an industrial solvent, plasticiser, and coalescing agent. (05 Mar 2000) |
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| pyrrolidone-5-carboxylate | A keto derivative of proline that is formed nonenzymatically from glutamate, glutamine, and gamma-glutamylated peptides; it is also produced by the action of gamma-glutamylcyclotransferase; elevated levels of 5-oxoproline are often associated with problems of glutamine or glutathione metabolism. Synonym: 5-pyrrolidone-2-carboxylic acid, pyroglutamic acid, pyrrolidone-5-carboxylate. (05 Mar 2000) |
| pyrrolidonecarboxylic acid | <chemical> A keto derivative of proline. Elevated levels of pyrrolidonecarboxylic acid are often associated with problems of glutamine or glutathione metabolism. Chemical name: L-Proline, 5-oxo- (12 Dec 1998) |
| pyrroline | <chemistry> A nitrogenous base, C4H7N, obtained as a colourless liquid by the reduction of pyrrol. Source: Websters Dictionary (01 Mar 1998) |
| pyrroline carboxylate reductases | <enzyme> A group of enzymes that catalyze the reduction of 1-pyrroline carboxylate to proline in the presence of NAD(p)h. Includes both the 2-oxidoreductase (ec 1.5.1.1) and the 5-oxidoreductase (ec 1.5.1.2). The former also reduces 1-piperidine-2-carboxylate to pipecolate and the latter also reduces 1-pyrroline-3-hydroxy-5-carboxylate to hydroxyproline. Registry number: EC 1.5.1.- (12 Dec 1998) |
| pyrroline-2-carboxylate reductase | An oxidoreductase reducing 1-pyrroline-2-carboxylate to l-proline with NAD(P)H. Synonym: proline dehydrogenase, proline oxidase. (05 Mar 2000) |
| pyrroline-5-carboxylate reductase | An oxidoreductase reversibly reducing 1-pyrroline-5-carboxylate to l-proline with NAD(P)H; a deficiency of this enzyme is associated with type I hyperprolinaemia. Synonym: proline dehydrogenase, proline oxidase. (05 Mar 2000) |
| pyrrolizidine alkaloids | <chemical> Alkaloids found in various species of senecio and other plants. There are at least ten different chemicals, many of them hepatotoxic, teratogenic, and carcinogenic. The plants may cause damage in grazing herds, but no longer have medical use. Pharmacological action: carcinogens. (12 Dec 1998) |
| pyrrolnitrin | <chemical> 3-chloro-4-(3-chloro-2-nitrophenyl)pyrrole. Antifungal antibiotic isolated from pseudomonas pyrrocinia. It is effective mainly against trichophyton, microsporium, epidermophyton, and penicillium. Pharmacological action: antibiotics, antifungal. Chemical name: 1H-Pyrrole, 3-chloro-4-(3-chloro-2-nitrophenyl)- (12 Dec 1998) |
| pyrula | <zoology> A genus of large marine gastropods. Having a pear-shaped shell. It includes the fig-shells. Origin: NL, fr. L. Pyrus a pear. Source: Websters Dictionary (01 Mar 1998) |
| pyrus | <botany> A genus of rosaceous trees and shrubs having pomes for fruit. It includes the apple, crab apple, pear, chokeberry, sorb, and mountain ash. Origin: L. Pyrus, or better pirus, pear tree. Source: Websters Dictionary (01 Mar 1998) |
| pyruvaldehyde | <chemical> An organic compound used often as a reagent in organic synthesis, as a flavoring agent, and in tanning. It has been demonstrated as an intermediate in the metabolism of acetone and its derivatives in isolated cell preparations, in various culture media, and in vivo in certain animals. Chemical name: Propanal, 2-oxo- (12 Dec 1998) |
| pyruvaldoxine | CH3CO-CH==NOH; propanone 1-oxine;a cholinesterase reactivator that can penetrate the blood-brain barrier readily and cause significant reactivation of phosphorylated acetylcholinesterase in the central nervous system; used to protect human beings and animals against otherwise lethal poisoning with organophosphorous anticholinesterase agents. Synonym: monoisonitrosoacetone, pyruvaldoxine. (05 Mar 2000) |
| pyruvate | <biochemistry> Pyruvate is the final product of glycolysis. You get two molecules of pyruvate for every molecule of glucose that goes through glycolysis. (22 Aug 1998) |
| pyruvate carboxylase | <enzyme> An enzyme that catalyses the formation of oxaloacetate from pyruvate, carbon dioxide and ATP in gluconeogenesis. (18 Nov 1997) |
| pyramid |
a pointed or cone-shaped structure or part; called also pyramis [TA]. The term is often used alone to indicate the pyramid of the medulla oblongata.
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| pyramid s. |
any sign pointing to disease of the pyramidal tract.
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| pyramidal b. |
os triquetrum.
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| pyramidal c. |
a conoid anterior polar cataract with its apex pointing forward.
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| pyramidal d. |
decussatio pyramidum.
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