Rhizobia are soil bacteria able to establish a nitrogen-fixing symbiosis with legume plants. Both in soil and in planta, rhizobia spend non-growing periods resembling the stationary phase of in vitro-cultured bacteria. The primary objective of this work was to better characterize gene regulation in this biologically relevant growth stage in Sinorhizobium meliloti. By a tap-tag/mass spectrometry...

Absfract: Cyclic sulfates 21-23 and sulfite 27 derived from glucofuranose lead to the 3,6_anhydrosugar 28 in excellent yields when treated with sodium sulfite or in basic media. When treated with sodium sulfite, the 3-deoxy derivative 24 fails to give the intramolecular cyclization which leads to the anhydrosugars. Instead it gives the disulfonate derivative 26. 28 was used as starting material...

Electron spin resonance (ESR) spin trapping was utilized to investigate the generation of free radicals from oxidation of sodium sulfite, nickel(II) sulfite, and nickel subsulfide (Ni3S2) by ambient oxygen or H2O2 at pH 7.4. The spin trap used was 5,5-dimethyl-1-pyrroline-N-oxide (DMPO). Under ambient oxygen, a solution of sodium sulfite alone generated predominantly sulfur trioxide anion radic...

An efficient electrocatalytic biosensor for sulfite detection was developed by co-immobilizing sulfite oxidase and cytochrome c with polyaniline sulfonic acid in a layer-by-layer assembly. QCM, UV-Vis spectroscopy and cyclic voltammetry revealed increasing loading of electrochemically active protein with the formation of multilayers. The sensor operates reagentless at low working potential. A c...

A Chan–Lam-type C–S coupling reaction using sodium aryl sulfinates has been developed to provide diaryl thioethers in up 92% yields the presence of a copper catalyst and potassium sulfite. Both electron-rich electron-poor diverse organoboron compounds were tolerated for synthesis heteroaryl dithioethers. The mechanistic study suggested that sulfite was involved deoxygenation sulfinate through r...

Isolated sulfite oxidase deficiency is a very rare autosomal recessive disorder associated with metabolism of sulfur containing amino acids. A 4-month-old girl with intractable seizures and feeding difficulty diagnosed as isolated sulfite oxidase deficiency is presented.

Colorimetric recognition and sensing of sulfite by melamine-modified gold nanoparticle is reported, using Tris-HCl as the operating buffer. Furthermore, indirect determination of hypochlorite is accomplished by its oxidation of sulfite.

Air pollutants are supposed to modulate physiological responses of alveolar macrophages (AM). This study was addressed to the question whether at neutral pH sulfur(IV) species in comparison to sulfur(VI) species cause AM to release proinflammatory mediators and which pathways are involved in their generation. Supernatants obtained from canine AM treated with sulfite (0.1 mM to 2 mM) enhanced th...