Thiobacillus thiooxidans cells oxidized elemental sulfur to sulfite, with 1 mol of O(2) consumption per mol of sulfur oxidized to sulfite, when the oxidation of sulfite was inhibited with 2-n-heptyl-4-hydroxyquinoline N-oxide.

In phototrophic sulfur bacteria, sulfite is a well-established intermediate during reduced sulfur compound oxidation. Sulfite is generated in the cytoplasm by the reverse-acting dissimilatory sulfite reductase DsrAB. Many purple sulfur bacteria can even use externally available sulfite as a photosynthetic electron donor. Nevertheless, the exact mode of sulfite oxidation in these organisms is a ...

The biochemical basis for sulfite accumulation by sulfate-using revertants of Salmonella pullorum was determined. All of the sulfate-using mutants isolated from wild-type S. pullorum accumulated sulfite when grown at 37 but not at 25 C. The specific activity of reduced nicotinamide adenine dinucleotide (NADPH)-dependent sulfite reductase (H2S-NADP oxidoreductase, EC 1.8.1.2) and of reduced meth...

Urocanase is inactivated in vivo and is reactivated by ultraviolet radiation. The chemistry of this photoregulation of urocanase was studied. Purified enzyme was inactivated by 25 pM sulfite (tl,z, 15 min). Dialyzed sulfite-treated inactive enzyme was photoactivatable. The activity can be cycled repeatedly by alternate ultraviolet light and sulfite treatments. Active enzyme binds 5 times more [...

UNLABELLED BACKGROUND Corn cob residue (CCR) is a kind of waste lignocellulosic material with enormous potential for bioethanol production. The moderated sulphite processes were used to enhance the hydrophily of the material by sulfonation and hydrolysis. The composition, FT-IR spectra, and conductometric titrations of the pretreated materials were measured to characterize variations of the ...

The superoxide dismutase (dismutase) which has already been found to be useful in detecting the role of O2 ain certain enzymic reactions has here been shown to be applicable to the study of nonenzymic reactions, as well. The aerobic oxidation of sulfite, which proceeds by a free radical chain mechanism, has been investigated with the aid of superoxide dismutase. The “spontaneous” oxidation of s...

Sulfites are used as food preservatives and excessive sulfite might disturb the body systems including the brain. Curcumin shows protective effects on the nervous system toxicity. The present study aimed to evaluate the protective role of curcumin in sulfite-induced anxiety in rats. Male rats were divided into five groups. The rats in groups I to V received distilled water (vehicle of sulfite, ...

Abstract This study compared 3 commonly used quenching agents for dechlorinating samples prior to disinfection byproduct (DBP) analysis under typical drinking water sampling conditions a representative suite of chlorination byproducts. Ascorbic acid and sodium sulfite quenched the residual free chlorine below detection within 5 seconds. Ammonium chloride did not quench with up 70% molar excess,...