When hydrogen peroxide is mixed with caustic soda, an auto-accelerating reaction can lead to gen­ eration of significant amounts of heat and oxygen. On the basis of experiments using typical pulp mill process con­ centration and temperatures, a relatively simple kinetic model has been developed. Evaluation of these model results reveals that hydrogen peroxide-caustic soda systems are extremely ...

The demand for conservative esthetic dentistry has dramatically grown and so has the rapid development of new non-restorative treatments for discolored teeth. Nightguard vital bleaching has become one of the most frequently used treatment modality for improving the esthetic appearance of teeth, primarily because of its relative ease of application, the safety of 10% carbamide peroxide bleaching...

Molecules and atoms can be isolated in low temperature solids, and this offers an opportunity to study their properties in monomeric and complexed forms, and in photochemical reactions. Hydrogen peroxide is an important molecule in various oxidation reactions in industrial chemistry and in the atmosphere. In this thesis, the vibrational properties, structure, and photochemistry of hydrogen pero...

There has been considerable discussion on the nature of the chemical configuration of the primary peroxide complexes of the catalases and peroxidases. The simplest hypothesis (l-5)) namely that peroxide complexes are formed in the reaction, is subject to alternative interpretations. For example, it has been postulated that the spectroscopically identifiable reaction product is not a peroxide co...

objectives: this study evaluated the effect of surface polishing on mercury release from dental amalgam after treatment with 16% carbamide peroxide gel. materials and methods: ninety-six samples from two different amalgam brands were prepared in truncated cone-shaped pvc polymer molds with an external surface area of 195 mm². half of the specimens were polished with green and red rubber, a brus...

The hydrogen peroxide sensitivity of cells lacking two proteins, Sco1 and Cox11, important in the assembly of cytochrome c oxidase (CcO), is shown to arise from the transient accumulation of a pro-oxidant heme A-Cox1 stalled intermediate. The peroxide sensitivity of these cells is abrogated by a reduction in either Cox1 expression or heme A formation but exacerbated by either enhanced Cox1 expr...

Hydrogen peroxide is one of the fundamental molecules of biology, regulating key cell signaling pathways and the development of numerous inflammatory diseases. There is therefore great interest in developing contrast agents that can detect hydrogen peroxide in vitro and in vivo. In this report, we present a new contrast agent for imaging hydrogen peroxide, termed the chemiluminescent poly(ethyl...

Reactive oxygen species contribute to the tissue injury seen after reperfusion of ischemic myocardium. We propose that toxicity originates from the effect that mitochondrial peroxide metabolism has on substrate entry into oxidative pathways. To support our contention, cultured adult rat cardiomyocytes were incubated with physiological concentrations of peroxide. The cellular extract and incubat...

We examined the effects of peroxide on the sarco(endo)plasmic reticulum Ca2+ (SERCA) pump in pig coronary artery endothelium and smooth muscle at three organizational levels: Ca2+ transport in permeabilized cells, cytosolic Ca2+ concentration in intact cells, and contractile function of artery rings. We monitored the ATP-dependent, azide-insensitive, oxalate-stimulated45Ca2+uptake by saponin-pe...

Hydrogen peroxide has been used for decades as an effervescent haemostatic agent in arthroplasty. Recently it has been shown to adversely affect the material properties of PMMA. We aim to assess whether any such deleterious effects are demonstrated in an experimental model which mimics the clinical use of hydrogen peroxide. Matched pairs of cancellous bone samples were treated with a swab soake...