The in vivo effect of trimethyltin chloride (Me3SnCl), free base meso-tetrakis(3,5-di-tert-butyl-4-hydroxyphenyl)porphyrin (R 4PH2) and their equimolar mixture, on the enzymatic activity of catalase (CAT), superoxide dismutase (SOD), and on the total content of free sulfhydryl groups has been studied in rat liver and kidney. It was demonstrated that the simultaneous treatment of tested animals ...

In the stallion testis, aromatase activity was localized in the microsomal fraction. Androgen aromatization occurred through the loss of 1 beta,2 beta hydrogen atoms and appeared to involve free sulfhydryl groups. A single enzyme system seemed to aromatize androgen and norandrogen at the same rate while having a much lower affinity for norandrogens.

Primary explants of P388, EL-4, and L1210 murine leukemia cells and of normal mouse bone marrow are shown to require sulfhydryl compounds for proliferation in vitro. Nine extablished cell lines show no stimulation by these compounds. Leukemia cells can lose the sulfhydryl dependence after various periods of adaptation to in vitro culture. Various sulfhydryl compounds have widely differing poten...

The changes in physicochemical properties of salt-soluble proteins and gel prepared with chicken breast muscles during −1.5oC (ice-temperature) 4oC (refrigerated temperature) storage were investigated. Compared the samples stored group, decrease solubility, content total sulfhydryl available groups SSP from at was effectively delayed, increase both surface hydrophobicity disulfide bond obviousl...

In this study, the effects of frozen (-18 °C) storage time on molecular weight, size distribution, conformation, free amino groups and free sulfhydryl groups of gluten were studied by small-angle X-ray scattering (SAXS), multi-angle laser light scattering (MALLS) in conjunction with a size exclusion chromatography (SEC) and spectrophotometrically. The results showed that the gluten dissolved in...

The interactions in free radicals processes between cyclosporine A (CsA) and sodium fluoride (NaF) on in vitro model human placental mitochondria were evaluated. The level of malondialdehyde, hydroxyl radical generation and concentration of sulfhydryl groups of protein was measured. The results showed that CsA with NaF did not give any toxicological interactions with NaF in the area of measured...

Large von Willebrand factor (vWf) multimers are assembled by the formation of disulfide bonds between dimers in trans Golgi and post-Golgi compartments. We were able to reproduce this process in a cell-free system using purified vWf dimers. The multimers formed in vitro extended to 5 x 10(6) Da and were similar in size distribution to those secreted constitutively by endothelial cells in cultur...

Catechol-containing antioxidants are able to protect against lipid peroxidation by nonenzymatic scavenging of free radicals with their catechol moiety. During their antioxidant activity, catechol oxidation products such as semiquinone radicals and quinones are formed. These oxidation products of 4-methylcatechol inactivate the GSH-dependent protection against lipid peroxidation and the calcium ...