Results 261 to 270 of about 315,385 (314)
Some of the next articles are maybe not open access.
Science, 2013
Superoxide in seawater may be produced by heterotrophic bacteria, with implications for trace metal cycling in the sea. [Also see Report by Diaz et al. ]
Shaked, Yeala, Rose, Andrew L
openaire +3 more sources
Superoxide in seawater may be produced by heterotrophic bacteria, with implications for trace metal cycling in the sea. [Also see Report by Diaz et al. ]
Shaked, Yeala, Rose, Andrew L
openaire +3 more sources
SUPEROXIDE RADICAL AND SUPEROXIDE DISMUTASES
Annual Review of Biochemistry, 1972O2- oxidizes the [4Fe-4S] clusters of dehydratases, such as aconitase, causing-inactivation and release of Fe(II), which may then reduce H2O2 to OH- +OH.. SODs inhibit such HO. production by scavengingO2-, but Cu, ZnSODs, by virtue of a nonspecific peroxidase activity, may peroxidize spin trapping agents and thus give the appearance of catalyzing OH ...
openaire +5 more sources
The mechanism(s) of superoxide reduction by superoxide reductases in vitro and in vivo [PDF]
JBIC Journal of Biological Inorganic Chemistry, 2002 Exposure of obligately anaerobic bacteria and archaea to transiently aerobic or micro-aerobic growth habitats requires that these microorganisms protect against oxidative stress resulting from adventitious dioxygen reduction. Superoxide reductases (SORs), which catalyze reduction of superoxide to hydrogen peroxide, have been identified as one component
Donald M. Kurtz, Eric D. Coulter
openaire +2 more sources
The Journal of Physical Chemistry B, 2005
Density-functional calculations indicate that the second sphere of coordination around the metal centers of manganese and iron superoxide dismutases (MnSODs and FeSODs) plays an important role in the binding of O2(-). In these systems, O2(-) prefers to bind to Mn or Fe in end-on configurations. For human and E.
Diane E. Cabelli +2 more
openaire +2 more sources
Density-functional calculations indicate that the second sphere of coordination around the metal centers of manganese and iron superoxide dismutases (MnSODs and FeSODs) plays an important role in the binding of O2(-). In these systems, O2(-) prefers to bind to Mn or Fe in end-on configurations. For human and E.
Diane E. Cabelli +2 more
openaire +2 more sources
Superoxide Dismutase Biosensors for Superoxide Radical Analysis
Analytical Letters, 1999ABSTRACT Some basic work has been performed on the development and optimisation of superoxide dismutase (SOD) biosensors for superoxide radical analysis. Initially we studied the possibility of obtaining a SOD biosensor using the Clark electrode as indicating sensor.
CAMPANELLA, Luigi +2 more
openaire +3 more sources
Superoxide Radical and Superoxide Dismutases: Threat and Defense
1980An enzymic flux of O2- and H2O2 caused strand breaks in the supercoiled covalently closed circular Col El plasmid. Subnanomolar levels of superoxide levels of superoxide dismutase or of catalase prevented this attack on DNA, signifying that both O2- and H2O2 were required.
Irwin Fridovich, Karen Brawn
openaire +3 more sources
Engineered Superoxide Dismutase Monomers for Superoxide Biosensor Applications
Analytical Chemistry, 2005Because of its high reaction rate and specificity, the enzyme superoxide dismutase (SOD) offers great potential for the sensitive quantification of superoxide radicals in electrochemical biosensors. In this work, monomeric mutants of human Cu,Zn-SOD were engineered to contain one or two additional cysteine residues, which could be used to bind the ...
Beissenhirtz, Moritz Karl +3 more
openaire +3 more sources
A superoxide dismutase-modified electrode that detects superoxide ion
Chemical Communications, 2002A superoxide dismutase (SOD)-modified electrode, in which SOD is oriented on the gold electrode via a self-assembled monolayer of cysteine so as to allow its direct electrode reaction, possesses a bi-directional electrocatalysis for both the oxidation of superoxide ion (O2-) to O2 and the reduction of O2- to H2O2 and functions as a third generation O2-
T.Ohsaka +4 more
openaire +3 more sources
Superoxidation of Retinoic Acid
Photochemistry and Photobiology, 2006Atmospheric pressure chemical ionization mass spectroscopy (APCI-MS) was used to examine the light-induced oxidation products of retinoic acid under conditions that favor and preclude its aggregation. We observed that in conditions that favor aggregation, i.e. in aqueous solutions, retinoic acid undergoes superoxidation to yield highly oxidized species.
Ilyas Washington +2 more
openaire +3 more sources
Superoxide interaction with nickel and iron superoxide dismutases
Journal of Molecular Graphics and Modelling, 2009Interaction of superoxide with the metal active sites of nickel and iron-containing superoxide dismutases is investigated with density functional theory. Outer-sphere mechanisms for both the reduction and oxidation of superoxide are proposed to be the common feature of these structurally unrelated SODs.
openaire +3 more sources