Aim This study aims to evaluate the color change in human enamel bleached with three different concentrations of hydrogen peroxide, containing pineapple extract as an additive in two different timings, using reflectance spectrophotometer. Background The study aimed to investigate the bleaching efficacy on natural teeth using natural enzymes. Materials and Methods Baseline color values of 10...

Exponential phase cells of the yeast, Saccharomyces cerevisiae when treated with a non-lethal concentration of hydrogen peroxide (H2O2; 0.2mM) for 60 min adapted to become resistant to the lethal effects of a higher dose of H2O2 (2mM). From studies using cycloheximide to inhibit protein synthesis it appears that protein synthesis is required for maximal induction of resistance but that some deg...

To explore the possibility of using graphene based biosensor, adsorption of hydrogen peroxide on graphene has been investigated using density functional theory. The electronic properties of defect free and defective graphene in the presence of different number of hydrogen peroxide have been studied. The graphene with the most stable configuration defect named as SW defect is considered. The hig...

or ferricyanide were not able to replace ascorbate and induce lipid peroxide formation. 2. The rate of ascorbate-induced peroxidation is optimum at pH 6-0 whereas the rate of the NADPH system is optimum at pH7-0. Both systems require phosphate for maximum activity. 3. Lipid peroxide formation occurs at the maximum specific rate in very dilute microsome suspensions (0-15mg. of protein/ ml.). 4. ...

Oxidative stressors such as hydrogen peroxide control the activation of many interconnected signaling systems and are implicated in neurodegenerative disease etiology. Application of hydrogen peroxide to PC12 cells activated multiple tyrosine kinases (c-Src, epidermal growth factor receptor (EGFR), and Pyk2) and the serine-threonine kinase ERK1/2. Peroxide-induced ERK1/2 activation was sensitiv...

In general, for the histochemical demonstration of peroxidase , b enzidine, naphthol, and leuco-dyes are utilized in the prosence of hydrogen peroxide. Among these , the technical modifications of the benzidine-peroxide method are the most numerous . Alpha-naphthol has been used less often than benzidine . Application of the leucodye method for animal tissues is remarkably limited and this meth...

It is well established that oxidative stress is an important cause of cell damage associated with the initiation and progression of many diseases. Consequently, all air-living organisms contain antioxidant enzymes that limit oxidative stress by detoxifying reactive oxygen species, including hydrogen peroxide. However, in eukaryotes, hydrogen peroxide also has important roles as a signaling mole...

Tyrosine kinase inhibitor, erbstatin, induced morphological apoptosis and DNA fragmentation in human small cell lung carcinoma (SCLC) cells. Erbstatin-induced apoptosis was inhibited by antioxidants, whereas erbstatin-inhibited tyrosine phosphorylation was not affected by them. Erbstatin was shown by means of flow cytometry to induce hydrogen peroxide generation. Furthermore, hydrogen peroxide ...

Hydrogen peroxide is a commonly used oxidizing agent with a variety of uses depending on its concentration. Ingestion of hydrogen peroxide is not an uncommon source of poisoning, and results in morbidity through three main mechanisms: direct caustic injury, oxygen gas formation and lipid peroxidation. A case of a 39-year-old man who inadvertently ingested 250 mL of unlabelled 35% hydrogen perox...

[1] We report infrared reflectance studies in the laboratory that reveal the state of hydrogen peroxide on Europa. Detailed analysis of the 3.5 mm infrared absorption band for hydrogen peroxide grown in a number of water ice environments shows that, for temperatures and concentrations relevant to Europa (80– 130 K), hydrogen peroxide molecules exist in isolated trimers H2O2.2H2O. If the tempera...