Scavenging of oxygen

Indium [7440-74-6] In, is sometimes used as a scavenger of oxygen. It promotes uniform grain size and casting fluidity. 

Chemical scavenging of oxygen by hydrazine. Hydrazine is an alternate scavenger, offering two principal advantages ... 

The salient features of these reactions are the promotion of hydrogen recombination and the scavenging of oxygen radicals by molecular phosphorus. This in turn will reduce the number of effective flame propagating radical species below the level at which the flame can be sustained.26... 

RuFj Preparation and Structure. Preparation. The ability of SF410 act as a reducing agent and as a scavenger of oxygen by exchanging fluorine for oxygen recommended its employment in the reduction of RuFs to produce RuFs. The likelihood that SF4 would form a salt Sp3-... 

The cardioprotective effect of melatonin is demonstrated in several studies in in vivo and ex vivo experimental rat models or cardiomyocytes, as reviewed by Reiter.30 Melatonin administration in perfused rat hearts subjected to ischemia and reperfusion increased postischemic recovery of function, reduced the duration of ventricular tachycardia and ventricular fibrillation and this was associated with decreased lipid peroxidation products and OH radical formation, indicating an antioxidant effect of melatonin.31 Furthermore, in pinealectomized rats, occlusion of the left coronary artery followed by reperfusion resulted in significant increase in infarct size than in intact animals.32 Melatonin acts as scavenger of oxygen or nitrogen based reactants, stimulates antioxidant enzymes, stabilizes cellular membrane, increases the efficiency of oxidative phosphorylation, reduces leukocyte recruitment and adhesion molecule expression and reduces homocysteine induced damage (reviewed by Duncker33). 

To get the diiodo telechelic structure, the authors used iodoform and methylene iodide as degenerative CTAs. SET involves the production of radical ions generating free radicals and anions or cations. Iodoform and methylene iodide can be activated both by degenerative transfer mediated by the growing PVC radicals and by SET. The reaction may be catalyzed by sodium dithionite (Na2S204). These catalyzed reactions allow the suppression of side reactions but also the scavenging of oxygen. The LRP of vinyl chloride resulted in diiodo PVC with Mn of 6000- 10 000 g mol 1 and with PDI of about 1.6. 

Interestingly, the rate and extent of increase in total renal sodium (largely intracellular) in the IPRK was also reduced by pretreatment with dimethylthiourea (DMTU) and dimethylsulfoxide (DMSO), both scavengers of oxygen-derived free radicals (OFR) [94]. These studies supported similar indirect evidence for OFR-induced injury during reperfusion [146,147]. The... 

Interestingly, bendazac is one of the agents that have been introduced for the treatment of cataracts. Bendazac and its main metabolite, the 5-hydroxy derivative, provide antioxidant effects as scavengers of oxygen-derived free radicals. 

Malfroy B, Doctrow SR, Orr PL et al. Prevention and suppression of autoimmune encephalomyelitis by EUK-8, a synthetic catalytic scavenger of oxygen-reactive metabolites. Cell Immunol 1997 177 62-8. 

Tetrafluoroethylene is a colorless, odorless gas (m.p. -142.5°C b.p. -76.3°C). It can violently disproportionate into carbon and carbon tetraflu-oride in the presenee of air and hence, its handling and transport is highly hazardous. In the presenee of air, it bums and also forms explosive mixtures with oxygen. Henee, polymerization of TFE requires special equipment and technology [89]. Tetrafluoroethylene is generally stored in steel cylinders in the form of liquid and stabilizers such as a-pinene and d-limonene, which act scavengers of oxygen, are used to prevent polymerization [90],... 

The complete series of antiostatins A and B can be synthesized exploiting the oxidative cyclization of an appropriately substituted (Ti -cyclohexa-l,3-diene)iron complex in the presence of ferrocenium hexafluorophosphate for the construction of the carbazole framework (Scheme 4-129)P ° This class of carbazole alkaloids strongly inhibits the radical induced lipid peroxidation by acting as scavengers of oxygen-derived free radicals. 

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