| sulfonium ion | A compound in which a sulfur atom has three single covalent bonds and therefore has a positive charge analogous to the nitrogen of an ammonium compound; e.g., S-adenosyl-l-methionine. (05 Mar 2000) |
|---|---|
| sulfonium salts | Compounds containing sulfur covalently linked to three moieties; e.g., RS+(R')R''', such as S-adenosyl-l-methionine. (05 Mar 2000) |
| sulfonylurea compounds | <chemical> Pharmacological action: hypoglycaemic agents. (12 Dec 1998) |
| sulfonylureas | Derivatives of isopropylthiodiazylsulfanilamide, chemically related to the sulfonamides, which possess hypoglycaemic action. Belonging to this series are acetohexamide, azepinamide, chlorpropamide, fluphenmepramide, glymidine, hydroxyhexamide, heptolamide, indylamide, thiohexamide, tolazamide, and tolbutamide. (05 Mar 2000) |
| sulfoprotein | A protein molecule containing sulfate groups. (05 Mar 2000) |
| sulforhodamine B | C27H29N207S2Na;a xanthene dye derivative, a fluorochrome used for tagging proteins by a sulfamido condensation; employed in immuno-fluorescence alone or in combination with fluorescein isothiocyanate for the simultaneous microscopic detection of two antigens in contrasting red and green colours. Synonym: lissamine rhodamine B 200. (05 Mar 2000) |
| sulformethoxine | <chemical> A long acting sulfonamide that is used, usually in combination with other drugs, for respiratory, urinary tract, and malarial infections. Pharmacological action: anti-infective agents, anti-infective agents, urinary, antimalarials. Chemical name: Benzenesulfonamide, 4-amino-N-(5,6-dimethoxy-4-pyrimidinyl)- (12 Dec 1998) |
| sulfosalicylic acid | HOC6H3(CO2H)SO3H; 3-carboxy-4-hydroxybenzenesulfonic acid;used as a test for albumin and ferric ion. Synonym: salicylsulfonic acid. (05 Mar 2000) |
| sulfosalicylic acid turbidity test | A test for measurement of protein in the urine; sulfosalicylic acid precipitates protein in the urine with a turbidity that is approximately proportional to the concentration of protein in a solution. (05 Mar 2000) |
| sulfosol | A hydrosol with sulfuric acid instead of water as the dispersion means. (05 Mar 2000) |
| sulfotransferase | Generic term for enzymes in EC sub-subclass 2.8.2 catalyzing the transfer of a sulfate group from 3'-phosphoadenylyl sulfate (active sulfate) to the hydroxyl group of an acceptor, producing the sulfated derivative and 3'-phosphoadenosine 5'-phosphate. Synonym: sulfikinase, sulfokinase. (05 Mar 2000) |
| sulfotransferases | <enzyme> Enzymes which transfer sulfate groups to various acceptor molecules. They are involved in posttranslational sulfation of proteins and sulfate conjugation of exogenous chemicals and bile acids. Registry number: EC 2.8.2 (12 Dec 1998) |
| sulfoxide | The sulfur analog of a ketone, R'-SO-R'. (05 Mar 2000) |
| sulfoxide reductase | <enzyme> Nadph or dithiothreitol can act as reducing agent; reduces sulindac to the corresponding sulfide Registry number: EC 1.8.- (26 Jun 1999) |
| sulfoxides | Organic compounds that have the general formula r-so-r. They are obtained by oxidation of mercaptans (analogous to the ketones). (12 Dec 1998) |