| pyran | A cyclic compound that may be considered the formal parent of sugars with an oxygen bridge from carbon atoms 1 to 5 (the pyranoses). (05 Mar 2000) |
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| pyran copolymer | <chemical> 2,5-furandione polymer with 1,1'-oxybis(ethene). Copolymer of divinyl ether and maleic anhydride that is acts as an immunostimulant with antineoplastic and anti-infective properties. It is used also in combination with other antineoplastic agent. Pharmacological action: antineoplastic agent, antiviral agents, interferon inducers. Chemical name: 2,5-Furandione, polymer with 1,1'-oxybis(ethene) (12 Dec 1998) |
| pyranone | A keto derivative of pyran. Synonym: pyranone. (05 Mar 2000) |
| pyranose | <chemical> Sugar structure in which the carbonyl carbon is condensed with a hydroxyl group (i.e. In a hemi acetal link), forming a ring of five carbons and one oxygen. most hexoses exist in this form, although in sucrose, fructose is found with the smaller (four carbon) furanose ring. (18 Nov 1997) |
| pyranose ring | <chemistry> A six-membered cyclic haemiacetal or ketal. (09 Jan 1998) |
| pyranosone dehydratase | <enzyme> From phanerochaete chrysosporium; acts on several osones (glycosuloses) with the preferred substrate being d-glucosone which was converted by the enzyme to cortalcerone; the pyranose form of glucosone undergoes two enzymatic dehydrations to give cortalcerone on spontaneous cyclization Registry number: EC 4.2.1.- Synonym: aldos-2-ulose dehydratase (26 Jun 1999) |
| pyrantel | <chemical> A depolarising neuromuscular-blocking agent, that causes persistent nicotinic activation resulting in spastic paralysis of susceptible nematodes. It is a drug of second-choice after benzimidazoles for treatment of ascariasis, hookworm, and pinworm infections, being effective after a single dose. Pharmacological action: antinematodal agent, neuromuscular depolarising agents. Chemical name: Pyrimidine, 1,4,5,6-tetrahydro-1-methyl-2-(2-(2-thienyl)ethenyl)-, (E)- (12 Dec 1998) |
| pyrantel pamoate | <chemical> Broad spectrum antinematodal anthelmintic used also in veterinary medicine. Pharmacological action: antinematodal agent. Chemical name: 2-Naphthalenecarboxylic acid, 4,4'-methylenebis(3-hydroxy-, compd. With (E)-1,4,5,6-tetrahydro-1-methyl-2-(2-(2-thienyl)ethenyl)pyrimidine (1:1) (12 Dec 1998) |
| pyrantel tartrate | <chemical> (e)-1,4,5,6-tetrahydro-1-methyl-2-[2-(2-thienyl)vinyl]pyrimidine tartrate (1:1). Broad spectrum anthelmintic for livestock. Synonym: banminth. Pharmacological action: anthelmintic, antinematodal agent. Chemical name: Pyrimidine, 1,4,5,6-tetrahydro-1-methyl-2-(2-(2-thienyl)ethenyl)-, (E)-, (R-(R*,R*))-2,3-dihydroxybutanedioate (1:1) (12 Dec 1998) |
| pyrargyrite | <chemical> Ruby silver; dark red silver ore. It is a sulphide of antimony and silver, occurring in rhombohedral crystals or massive, and is of a dark red or black colour with a metallic adamantine luster. Origin: Gr. Fire + silver. Source: Websters Dictionary (01 Mar 1998) |
| pyrathiazine hydrochloride | 10-[2-(1-Pyrrolidyl)ethyl]phenolthiazine hydrochloride;an antihistaminic. (05 Mar 2000) |
| pyrazinamide | <chemical> A pyrazine that is used therapeutically as an antitubercular agent. Pharmacological action: antitubercular agents. Chemical name: Pyrazinecarboxamide (12 Dec 1998) |
| pyrazinamide deamidase | <enzyme> Pyrazinamide forms pyrazinoic acid and ammonia Registry number: EC 3.5.1.- Synonym: pyrazinamidase, pnca gene product (26 Jun 1999) |
| pyrazolone | A class of non-steroidal anti-inflammatory agents used in the treatment of arthritic conditions; e.g., phenylbutazone. (05 Mar 2000) |
| pyrectic | <symptom> Pertaining to or characterised by fever. Origin: L. Febrilis (18 Nov 1997) |