Features that alter the glycolipid sugar headgroup accessibility at the membrane interface have been studied in bilayer lipid model vesicles using a fluorescence technique with the enzyme galactose oxidase. The effects on oxidation caused by variation in the hydrophobic moiety of galactosylceramide or the membrane environment for galactosylceramide, monogalactosyldiacylglycerol and digalactosyl...

It is well known that endotoxin (Et) plays an important role in severe surgical infectious diseases such as peritonitis. Recently, it has been reported that increased superoxide (O2-) formation and accelerated lipid-peroxidation cause the progress of Et shock. The present study was designed to estimate the changes in the amount of lipid-peroxides in the liver and the relationship between Et and...

The effect of various abiotic stresses on photosynthetic apparatus is inevitably associated with formation of harmful reactive oxygen species (ROS). In this review, recent progress on ROS production by photosystem II (PSII) as a response to high light and high temperature is overviewed. Under high light, ROS production is unavoidably associated with energy transfer and electron transport in PSI...

 The a im of th is paper was to study the effects w hey pro t e in c oat i ng on ch e m ic al a nd physic al properties of gut t ed K i l ka dur i ng f roz en stor a ge. Coating of Kilka has done by dipping in whey protein solution with different concentrations of 3, 7, 10 and 13%, for 1h. Then, after being packed in polyethylene dishes, they were covered in cellophane blanket and stored in -18...

Received October 24, 1978 Summary : Cyclooxygenase catalysis is stimulated by its product, PGG2, and by other lipid hydroperoxides. The endoperoxide, PGH , was not stimulatory. The results provide a direct demonstration of an essen & ial role for lipid hydroperoxides in prostaglandin biosynthesis, and show how the biosynthetic intermediate PGG2 has a positive accelerative effect. INTRODUCTION A...

An animal model was established to study the toxic effects of hyperoxia and the consequent changes in intracellular antioxidant status. Superoxide dismutase, catalase and glutathione peroxidase activities were measured in erythrocytes, liver and lung, in addition to cellular glutathione concentrations and its associated metabolism. Overt cellular damage was assessed biochemically by measurement...

The lipid materials extracted from hog thyroid microsomes were found to contain factors which stimulated both the NADPH oxidation by NADPH-cytochrome c reductase and PBI formation by a reconstituted system containing the reductase as a hydrogen peroxide generator and thyroid peroxidase. For both reactions, the stimulating activity in the extracts from the other subcellular fractions was less th...

The expression of MDR1b coding mRNA is increased in alveolar type II cells from juvenile rat lung in culture. Hydrogen peroxide and paraquat-induced further upregulation supporting that oxidative stress mediated mechanisms are involved in the regulation of MDR1b in rat lung. The expression rates of mRNA for catalase, Cu/Zn-superoxide dismutase (Cu/Zn-SOD) and Mn-superoxide dismutase (Mn-SOD) re...

The present experiment was designed to access the effects of Methylmercury chloride ( MeHgCl) on antioxidant status, protein concentration, lipid peroxidation and hydroperoxidation in brain parts, spinal cord, lung, heart and pancreas of rats. Twenty male Wistar rats (3 months old) were divided in saline controls (C) and MeHgCl-treated group (MMC). Treated rats were intoxicated with MMC ...