Hydrogen Peroxide Uploaded by seaquest on Dec 13, H2O2a colourless liquid usually produced as aqueous solutions of various strengths, used principally for bleaching cotton and other textiles and wood pulp, in the manufacture of other chemicals, as a rocket propellant, and for cosmetic and medicinal purposes. Solutions containing more than about 8 percent hydrogen peroxide are corrosive to the skin.
Redox Regulation of Arabidopsis Mitochondrial Citrate Synthase Citrate synthase has a key role in the tricarboxylic TCA cycle of mitochondria of all organisms, as it catalyzes the first committed step which is the fusion of a carbon-carbon bond between oxaloacetate and acetyl CoA.
The regulation of TCA cycle function is especially important in plants, since mitochondrial activities have to be coordinated with photosynthesis. The posttranslational regulation of TCA cycle activity in plants is thus far almost entirely unexplored. Although several TCA cycle enzymes have been identified as thioredoxin targets in vitro, the existence of any thioredoxin-dependent regulation as known for the Calvin cycle, yet remains to be demonstrated.
Here we have investigated the redox regulation of the Arabidopsis citrate synthase enzyme by site-directed mutagenesis of its six cysteine residues.
Our results indicate that oxidation inhibits the enzyme activity by the formation of mixed disulfides, as the partially oxidized citrate synthase enzyme forms large redox-dependent aggregates.
Furthermore, we were able to demonstrate that thioredoxin can cleave diverse intra- as well as intermolecular disulfide bridges, which strongly enhances the activity of the enzyme.
Activity measurements with the cysteine variants of the enzyme revealed important cysteine residues affecting total enzyme activity as well as the redox sensitivity of the enzyme.A Million Abortions a Year Hydrogen Peroxide to See What Factors Affect The Decomposition Of Hydrogen Peroxide By An Investigation on the rate of reaction of the enzyme Catalase on the substrate Hydrogen peroxide.
Several reagents were tested as possible future pre-treatments to hydrogen peroxide bleaching of discoloured paper with the goal of minimizing the degrading effect of hydrogen peroxide on cellulose.
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* Hydrogen peroxide is a strong oxidizer effective in controlling sulfide and organic-related odors in wastewater collection and treatment systems.
It is typically applied to a wastewater system where there is a retention time of 30 minutes to 5 hours before hydrogen sulfide is released. The most important covalent peroxide is hydrogen peroxide, H2O2.
When pure, this syrupy, viscous liquid has a pale blue colour, although it appears almost colourless. Hydrogen peroxide decompositions by metal ions and catalase are important causes limiting the brightness response of recovered papers pulps to peroxide.
Hydrogen peroxide can be decomposed into oxygen and water by some compounds. It is well known that trace metals are .