Results 1 to 10 of about 44,426 (335)
Magnetism of sodium superoxide [PDF]
CrystEngComm 16, 522 (2014), 2013 By combining first-principles electronic-structure calculations with the model Hamiltonian approach, we systematically study the magnetic properties of sodium superoxide (NaO2), originating from interacting superoxide molecules. We show that NaO2 exhibits a rich variety of magnetic properties, which are controlled by relative alignment of the ...
Z. V. Pchelkina +4 more
arxiv +6 more sources
Superoxide dismutase in leukocytes [PDF]
FEBS Letters, 1974 1 ] or NBT [ 141 in the xanthine-xanthine oxidase reaction. The reduction of NBT and cytochrome c was followed at 560 and 550 nm respectively. One unit of SOD activity is defined as the amount of enzyme that causes a decrease of the optical density from 0.025 to 0.0125 in 1 min using 1 cm light path cuvette.
Pierluigi Patriarca +2 more
openalex +5 more sources
Scavenging of superoxide by a membrane-bound superoxide oxidase [PDF]
Nature Chemical Biology, 2018 Superoxide is a reactive oxygen species produced during aerobic metabolism in mitochondria and prokaryotes. It causes damage to lipids, proteins and DNA and is implicated in cancer, cardiovascular disease, neurodegenerative disorders and aging. As protection, cells express soluble superoxide dismutases, disproportionating superoxide to oxygen and ...
Camilla A. K. Lundgren +9 more
openaire +3 more sources
Correlation-driven metal-insulator transition in unconventional magnetic metal superoxides [PDF]
Materials Research Bulletin Vol 167 112389 (2023), 2023 Using first-principles electronic structure calculations, we have extensively studied the electronic and magnetic properties of alkali sodium superoxide (NaO2) in comparison with that of potassium superoxide (KO2) both at high and low temperatures. These properties of these superoxides are governed by the unpaired electron donated by the alkali atoms ...
arxiv +1 more source
Superoxide Dismutases and Superoxide Reductases
Chemical Reviews, 2014 Superoxide, O2•–, is formed in all living organisms that come in contact with air, and, depending upon its biological context, it may act as a signaling agent, a toxic species, or a harmless intermediate that decomposes spontaneously. Its levels are limited in vivo by two different types of enzymes, superoxide reductase (SOR) and superoxide dismutase ...
Isabel A. Abreu +7 more
openaire +3 more sources
Discovery of superoxide reductase: an historical perspective [PDF]
Journal of Biological Inorganic Chemistry, 2004, 9, pp.119-23, 2014 For more than 30 years, the only enzymatic system known to catalyze the elimination of superoxide was superoxide dismutase, SOD. SOD has been found in almost all organisms living in the presence of oxygen, including some anaerobic bacteria, supporting the notion that superoxide is a key and general component of oxidative stress. Recently, a new concept
arxiv +1 more source
Reaction of the desulfoferrodoxin from Desulfoarculus baarsii with superoxide anion. Evidence for a superoxide reductase activity [PDF]
The journal of biological chemistry, American Society for
Biochemistry and Molecular Biology, 2000, 275, pp.115-21, 2014 Desulfoferrodoxin is a small protein found in sulfate-reducing bacteria that contains two independent mononuclear iron centers, one ferric and one ferrous. Expression of desulfoferrodoxin from Desulfoarculus baarsii has been reported to functionally complement a superoxide dismutase deficient Escherichia coli strain.
arxiv +1 more source
Copper- and Zinc-containing Superoxide Dismutase Can Act as a Superoxide Reductase and a Superoxide Oxidase [PDF]
Journal of Biological Chemistry, 2000 The copper- and zinc-containing superoxide dismutase can catalyze the oxidation of ferrocyanide by O(2) as well as the reduction of ferricyanide by O(2). Thus, it can act as a superoxide dismutase (SOD), a superoxide reductase (SOR), and a superoxide oxidase (SOO).
Stefan I. Liochev, Irwin Fridovich
openaire +3 more sources
Polymer coated cerium oxide nanoparticles as oxidoreductase-like catalysts [PDF]
ACS Appl. Mater. Interfaces 2020, 12, 37, 42056 - 42066, 2020 Cerium oxide nanoparticles have been shown to mimic oxidoreductase enzymes by catalyzing the decomposition of organic substrates and reactive oxygen species. This mimicry can be found in superoxide radicals and hydrogen peroxides, harmful molecules produced in oxidative stress asso-ciated diseases.
arxiv +1 more source
Detoxification of superoxide without production of H2O2: antioxidant activity of superoxide reductase complexed with ferrocyanide [PDF]
proceedings of the national Academy of Sciences of the United
States of America, PNAS, 2006, pp.14750-5, 2015 The superoxide radical O(2)(-.) is a toxic by-product of oxygen metabolism. Two O(2)(-.) detoxifying enzymes have been described so far, superoxide dismutase and superoxide reductase (SOR), both forming H2O2 as a reaction product. Recently, the SOR active site, a ferrous iron in a [Fe(2+) (N-His)(4) (S-Cys)] pentacoordination, was shown to have the ...
arxiv +1 more source