要約:システインパースルフィドなどの活性イオウ分 子種は,チオール基に過剰にイオウ原子が付加したポ リスルフィド構造を有する化合物であり,通常のチ オール化合物に比べ,高い求核性と抗酸化活性を有し ている.近年,ポリスルフィドは,システインやグル タチオンなどの低分子チオール化合物だけでなく,タ ンパク質中のシステイン残基にも多く存在し,細胞内 の様々なタンパク質がポリスルフィド化されているこ とが明らかになってきた.タンパク質中のシステイン チオール基は,活性酸素や親電子物質によりもたらさ れる酸化ストレスのセンサーとして重要な役割を果た していることが知られており,ポリスルフィド化はタ ンパク質機能制御を介したレドックスシグナル伝達メ カニズムとして,細胞機能制御に関与することが予想 される.しかしながら,複雑な化学特性を有するポリ スルフィドは検出が難しいことから,生体内におけ...

i Work was performed to determine the possible effectiveness of sulfur-containing fuel additives as contrail suppressents. Such suppression would require production of significant levels of sulfur trioxide, a known suppressent, in the exhaust. A model combustor capable of simulating turbojet operation at 40,000 feet was designed and built, and a gas sampling and analysis procedure developed for...

We present fully reactive interatomic potentials for systems containing gold, sulfur, carbon, and hydrogen, employing the ReaxFF formalism. The potential is designed especially for simulating gold-thiol systems and has been used for studying cluster deposition on self-assembled monolayers. Additionally, a large number of density functional theory calculations are reported, including molecules c...

Biocide programs have become necessary in most fine paper manufacturing circuits, as drastic reduction of fresh water consumption in the industry enhances microbial development. Depending on their chemical nature, biocides may interfere with typical wet-end chemistry additives and furnish. A reference wet-end chemistry was set (including fixing aid, dry strength aid, sizing agent, and retention...

Magnesium (Mg) deficiency increases genomic instability and Mg intake has been reported to be inversely associated with a risk of colorectal cancer (CRC). This study was designed to determine whether organo-Mg in drinking water suppresses inflammation-associated colon carcinogenesis in mice. Male Crj: CD-1 mice were initiated with a single i.p. injection of azoxymethane (AOM, 10mg/kg body weigh...

stabilizer such as cane sugar to liquid lime-sulfur and evaporating to dryncss. Self-boiled lime-sulfur is made by utilizing the heat of hydration or slaking of quicklime, CaO, to carry on the reactions with sulfur. Ammonium polysulfide and sodium polysulfide are made by passing hydrogen Sulfide gas, H.^S, into ammonium or sodium hydroxide containing excess sulfur. It is supposed that the chemi...

Polysulfides formed through the breakdown of elemental sulfur or other sulfur compounds were found to be reduced to H(2)S by the hyperthermophilic archaebacterium Pyrococcus furiosus during growth. Metabolism of polysulfides by the organism was dissimilatory, as no incorporation of S-labeled elemental sulfur was detected. However, [S]cysteine and [S]methionine were incorporated into cellular pr...

The research of organoclays has been occurring for many years to develop and add value these inorganic materials several industrial applications, such as pollutant absorbers or impermeable plastics. organoclay applications are intrinsically related organo-modification the structure clays. This study shows preparation characterization produced by a nontronite type clay (calcic bentonite) from To...

A comparison of four selective detectors for analysis of single-digit ppb level sulfur is described. A dynamic blending system is used for point of use preparation of low level gaseous mixtures of eight sulfur compounds including H 2 S, COS, CS 2 and selected mercaptans in helium, ethylene, propylene, and carbon dioxide. The criteria to consider for selecting the best detector for an applicatio...

The enhanced inertness of the new 5973 inert MSD improves analysis of trace level volatile sulfur compounds. When operated in scan or selected ion monitoring mode, excellent sensitivity, selectivity, and peak symmetry are obtained for active compounds. Eight volatile sulfur species are used to demonstrate these attributes in a variety of hydrocarbon matrices. The system is well suited for the c...