| sulfhydryl reagent | Reagents that react with thiol groups, particularly those in proteins. (05 Mar 2000) |
|---|---|
| sulfhydryl reagents | Chemical agents that react with sh groups. This is a chemically diverse group that is used for a variety of purposes. Among these are enzyme inhibition, enzyme reactivation or protection, and labelling. (12 Dec 1998) |
| sulfide | A compound of sulfur in which the sulfur has a valence of -2; e.g., Na2S, HgS; also, a thioether (i.e., R-S-R', such as lanthionine). Synonym: sulfuret. (05 Mar 2000) |
| sulfide dehydrogenase | <enzyme> From bacteria Registry number: EC 1.8.2.- Synonym: flavocytochrome c, soxb protein, soxb gene product (26 Jun 1999) |
| sulfide oxidase | <enzyme> Catalyses the conversion of hydrogen sulfide to sulfur; isolated from hyphomicrobium neptunium Registry number: EC 1.8.- (26 Jun 1999) |
| sulfide quinone reductase | <enzyme> Part of the photosynthetic electron transport chain in chlorobium; reaction occurs in the dark, in the absence of oxygen Registry number: EC 1.8.5.- Synonym: plastoquinone reductase, sulfide-quinone oxidoreductase, sqr enzyme, sulfide-quinone reductase (26 Jun 1999) |
| sulfides | Chemical groups containing the covalent sulfur bonds -s-. The sulfur atom can be bound to inorganic or organic moieties. (12 Dec 1998) |
| sulfikinase | 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) |
| sulfindigotic acid | C8H5NOSO3;formed by the action of sulfuric acid on indigo, a reaction that also yields indigo carmine. (05 Mar 2000) |
| sulfinic acids | Any of the monobasic inorganic or organic acids of sulfur with the general formula rso(oh). (12 Dec 1998) |
| sulfinpyrazone | <chemical> A uricosuric drug that is used to reduce the serum urate levels in gout therapy. It lacks anti-inflammatory, analgesic, and diuretic properties. Pharmacological action: uricosuric agents. Chemical name: 3,5-Pyrazolidinedione, 1,2-diphenyl-4-(2-(phenylsulfinyl)ethyl)- (12 Dec 1998) |
| sulfisomidine | <chemical> A sulfanilamide antibacterial agent. Pharmacological action: anti-infective agents. Chemical name: Benzenesulfonamide, 4-amino-N-(2,6-dimethyl-4-pyrimidinyl)- (12 Dec 1998) |
| sulfisoxazole | <chemical> 4-amino-n-(3,4-dimethyl-5-isoxazolyl)benzenesulfonamide. One of the antibacterial sulfonamides generally used for treatment of infections. It is bacteriostatic against a wide range of gram- negative and gram-positive organisms, but acquired resistance is common. Pharmacological action: anti-infective agents. Chemical name: Benzenesulfonamide, 4-amino-N-(3,4-dimethyl-5-isoxazolyl)- (12 Dec 1998) |
| sulfite | A salt of sulfurous acid; elevated in cases of molybdenum cofactor deficiency. Sulfite dehydrogenase, an oxidoreductase catalyzing the reaction of sulfite with 2 ferricytochrome c and water to sulfate and 2-ferrocytochrome c. Sulfite oxidase, a liver oxidoreductase (haemoprotein) catalyzing the reaction of inorganic sulfite ion with O2 and water to produce sulfate ion and H2O2; a lower activity of this enzyme is observed in cases of molybdenum cofactor deficiency. Sulfite reductase, oxidoreductase catalyzing reduction of sulfite to H2S using some reduced acceptor. (05 Mar 2000) |
| sulfite oxidases | <enzyme> A molybdohemoprotein which catalyses the terminal reaction in the oxidative degradation of sulfur-containing amino acids with the formation of a sulfate. Cytochrome c, ferricyanide and molecular oxygen can act as acceptors. A deficiency is manifested by brain damage and mental deterioration. Utilises ferricytochrome c as acceptor. Uses molecular oxygen. Registry number: EC 1.8.3.1 (12 Dec 1998) |