The formation of hydrogen peroxide during the oxidation of NADH by purified preparations of cytochrome o has been demonstrated by employing three independent methods: polarographic, calorimetric, and fluorometric. The first two methods were used to assay for the accumulation of hydrogen peroxide and showed that hydrogen peroxide did accumulate as a product, but only about 30% of the oxygen cons...

Hydrogen peroxide inhibition of maximum Ca2+-ATPase and Na+,K+-ATPase activity was measured in a membrane-enriched preparation of rabbit lens cortical fibers and epithelium. At 5 X 10(-6) M hydrogen peroxide maximum Ca2+-ATPase activity was inhibited by 39%, while maximum Na+,K+-ATPase activity was stimulated. Ca2+-ATPase activity was almost completely inhibited at 5 X 10(-4) M hydrogen peroxid...

introduction: the prevalence of chronic diseases increases with age. increased production of reactive oxygen species (ros) involves in the pathogenesis of cardiovascular diseases such as coronary atherosclerosis, hypertension, diabetic vascular complications, and heart failure. the present study aimed to explore the effects of resistance training on plasma hydrogen peroxide level of ageing wome...

wastewater from molasses processing contains a large amount of coloured substances that give a recalcitrant dark brown colour and high organic load to the effluent. photocatalytic decolourization of molasses wastewater was performed using titanium dioxide catalyst coated on the surface of south african natural zeolite using the solid-solid dispersion method. addition of hydrogen peroxide as an ...

hydrogen peroxide is an important mild oxidant which is widely used in various applications including remediation of waste waters and drinking water resources. the safe level of h2o2 residue has to be controlled through accurate and precise measurement methods. a facile spectrophotometric method for the determination of hydrogen peroxide is based on the reaction of iodine solution with toluidin...

Glycerophosphate (GP)-dependent, ferricyanide-induced hydrogen peroxide production was studied in brown adipose tissue mitochondria from newborn rats. Relations between the rate of hydrogen peroxide production and total amount of hydrogen peroxide produced at different GP and ferricyanide concentrations were determined. It was found that the rate of hydrogen peroxide production increases with i...

The catalase-ethyl hydrogen peroxide compound studied by Stern (1) formed slowly, even in the presence of a very large concentration of ethyl hydrogen peroxide. In the previous paper (2), Stern’s compound has been shown to be preceded by a green primary compound. These kinetic studies show that the primary compound forms rapidly, has a high affinity* for its substrate, and quantitatively fulfil...

The catalase-ethyl hydrogen peroxide compound studied by Stern (1) formed slowly, even in the presence of a very large concentration of ethyl hydrogen peroxide. In the previous paper (2), Stern’s compound has been shown to be preceded by a green primary compound. These kinetic studies show that the primary compound forms rapidly, has a high affinity* for its substrate, and quantitatively fulfil...

abstract statement of problem: bleaching systems with different concentrations and applications are widely used to improve the visual appearance of the teeth, but one of the complications of these materials is reduction of bond strength for immediately bonding to the bleached enamel. objectives: the aim of this study was to evaluate the influence of using different modified hydrogen peroxide bl...

Hartley (4) has reported the amino acid sequence of a 25-residue peptide from the tryptic digest of X-sulfochymotrypsinogen which contains the “active center” serine as well as both methionine residues of a-chymotrypsin (Fig. 1). By kinetic analysis, Ray et al. (5, 6) deduced that 1 of the 2 methionine residues and 1 of the 2 histidine residues in chymotrypsin are rapidly destroyed on photo-oxi...