| p-chloral | A polymer of chloral obtained by prolonged contact with sulfuric acid; it has properties similar to those of chloral hydrate. Synonym: metachloral, p-chloral, trichloral. (05 Mar 2000) |
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| p-chloroamphetamine | <chemical> Chlorinated analog of amphetamine. Potent neurotoxin that causes release and eventually depletion of serotonin in the CNS. It is used as a research tool. Pharmacological action: serotonin agents. Chemical name: Benzeneethanamine, 4-chloro-alpha-methyl- (12 Dec 1998) |
| p-chloromercuribenzoate | Organic mercury compound (ClHgC6H4COO-, ClHgBzO-) that reacts with -SH groups of proteins; an inhibitor of action of those proteins (enzymes) that depend on -SH reactivity. See: p-mercuribenzoate. Acronym: PCMB (05 Mar 2000) |
| p-chlorophenol | A disinfectant effective against most Gram-negative organisms; also available as camphorated parachlorophenol. Synonym: p-chlorophenol. (05 Mar 2000) |
| P-congenitale | The P-wave pattern in the electrocardiogram seen in some cases of congenital heart disease, consisting of tall peaked P waves in leads I, II, aVF, and aVL (usually largest in lead II) with predominant positivity of diphasic waves in V1-2. See: spannungs-P. (05 Mar 2000) |
| p-cresol oxidoreductase | <enzyme> Catalyses hydroxylation of methyl group Registry number: EC 1.14.- Synonym: flavochrome p-cresol methylhydrolase (26 Jun 1999) |
| P-dextrocardiale | An electrocardiographic syndrome characteristic of overloading of the right atrium, often erroneously called P-pulmonale because the syndrome can result from any overloading of the right atrium (e.g., tricuspid stenosis) and independently of cor pulmonale. (05 Mar 2000) |
| p-dimethylaminoazobenzene | <chemical> N,n-dimethyl-4-(phenylazo)benzenamine. Reagent used primarily for the induction of experimental liver cancer. According to the fourth annual report on carcinogens (ntp 85-002, p. 89) published in 1985, this compound "may reasonably be anticipated to be a carcinogen." (merck, 11th ed) Pharmacological action: carcinogens, dyes. Chemical name: Benzenamine, N,N-dimethyl-4-(phenylazo)- (12 Dec 1998) |
| p-fluorophenylalanine | <chemical> 3-(p-fluorophenyl)-alanine. Chemical name: Phenylalanine, 4-fluoro- (12 Dec 1998) |
| p-glycoprotein | <cell biology, protein> A family of integral plasma membrane proteins which, when overexpressed, function as adenosine triphosphate-dependent efflux pumps, causing multidrug resistance. Mammalian p-glycoproteins are encoded by small mdr gene families. There are several isotypes in multiple species. See: multidrug transporter. (22 Sep 2002) |
| P-H conduction time | See: atrioventricular conduction. (05 Mar 2000) |
| p-hydroxyamphetamine | <chemical> Amphetamine metabolite with sympathomimetic effects. Pharmacological action: mydriatics, sympathomimetic. Chemical name: Phenol, 4-(2-aminopropyl)- (12 Dec 1998) |
| p-hydroxymercuribenzoate | An organic mercurial, HOHgC6H4COO-, formed spontaneously by hydrolysis of the p-chloro compound. See: p-mercuribenzoate. (05 Mar 2000) |
| p-hydroxynorephedrine | <chemical> Alpha-(1-aminoethyl)-p-hydroxybenzyl alcohol. Parahydroxy analog of phenylpropanolamine with properties as a sympathomimetic. Chemical name: Benzenemethanol, alpha-(1-aminoethyl)-4-hydroxy- (12 Dec 1998) |
| p-hydroxyphenylacetate | A minor side product of l-tyrosine degradation that is elevated in the urine in cases of neonatal tyrosinaemia and in Richner-Hanhart syndrome. (05 Mar 2000) |