BACKGROUND Oxidative stress can severely compromise viability of bifidobacteria. Exposure of Bifidobacterium cells to oxygen causes accumulation of reactive oxygen species, mainly hydrogen peroxide, leading to cell death. In this study, we tested the suitability of continuous culture under increasing selective pressure combined with immobilized cell technology for the selection of hydrogen pero...

Stern (1) has found that as much as 0.13 N ethyl hydrogen peroxide is required to give 50 per cent inhibition of the destruction of hydrogen peroxide by catalase. This is difficult to understand in view of the high affinities of catalase for ethyl hydrogen peroxide in both the primary and secondary compounds (~2 X 10” M) (2), in which all the catalase hematins are bound to ethyl hydrogen peroxi...

The effect of UV/Ozone irradiation together with the pretreatments using distilled water, hydrogen peroxide, and hydrogen peroxide/sodium silicate solutions on the dyeing depth of the poly(lactic acid), PLA, and poly(ethylene terephthalate), PET, fabrics by the application of disperse dyes were investigated and the results were compared with that of untreated fabrics. The results showed that th...

The main objective of this work is to upgrade a diesel oil sample from Shiraz Oil Refining Co. (SORC) to reduce the sulfur content, as well as break the kinematic viscosity of the feedstock. Effects of several operating parameters including volume of hydrogen peroxide/acetic acid as an oxidant mixture, amounts of tetraoctylammonium bromide as a phase transfer agent (PTA) and phosphotungstic aci...

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...

To determine the regulatory role of p72syk in lymphocyte activation, peripheral blood lymphocytes were treated with 10 mM hydrogen peroxide. Hydrogen peroxide induced a rapid elevation of p72syk activity (4-6-fold) and a dramatic increase in tyrosine phosphorylation of a number of cellular proteins, including phospholipase C gamma 1 (PLC gamma 1) and p72syk. Monoclonal antibodies to PLC gamma 1...

The present study was designed to determine the effects of the essential oil of Laurusnobilis L. (Lauraceae) and its three main components on α-glucosidase and reactive oxygenspecies scavenging activity. The chemical composition of the essential oil from Laurus nobilisL. leaves was analyzed by GC/GC-MS and resulted in the identification of 29 compounds,representing 99.18% of the total oil. 1,8-...

abstract reactive oxygen species and oxidative stress impair β-cell function and reduce insulin secretion. it has been shown that progesterone and cilostazol possess antioxidant properties. the present study was aimed to investigate in vitro pretreatment effect of progesterone and cilostazol on insulin secretion as well as their protective effects against hydrogen peroxide-induced oxidative str...