scholarly journals Correction: Khorobrykh, A. Hydrogen Peroxide and Superoxide Anion Radical Photoproduction in PSII Preparations at Various Modifications of the Water-Oxidizing Complex. Plants 2019, 8, 329

Plants ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 187
Author(s):  
Andrey Khorobrykh
Keyword(s):  
Hydrogen Peroxide ◽  
Superoxide Anion ◽  
Anion Radical ◽  
Superoxide Anion Radical ◽  
Water Oxidizing Complex

In the original article, there was a mistake in the legend for ** Figure 5 ** [...]

scholarly journals Hydrogen Peroxide and Superoxide Anion Radical Photoproduction in PSII Preparations at Various Modifications of the Water-Oxidizing Complex

Plants ◽  
2019 ◽  
Vol 8 (9) ◽  
pp. 329 ◽  
Author(s):  
Andrey Khorobrykh
Keyword(s):  
Hydrogen Peroxide ◽  
Electron Transport ◽  
Photosystem Ii ◽  
Superoxide Anion ◽  
Anion Radical ◽  
Electron Flow ◽  
High Potential ◽  
Electron Donors ◽  
Superoxide Anion Radical ◽  
Water Oxidizing Complex

The photoproduction of superoxide anion radical (O2−•) and hydrogen peroxide (H2O2) in photosystem II (PSII) preparations depending on the damage to the water-oxidizing complex (WOC) was investigated. The light-induced formation of O2−• and H2O2 in the PSII preparations rose with the increased destruction of the WOC. The photoproduction of superoxide both in the PSII preparations holding intact WOC and the samples with damage to the WOC was approximately two times higher than H2O2. The rise of O2−• and H2O2 photoproduction in the PSII preparations in the course of the disassembly of the WOC correlated with the increase in the fraction of the low-potential (LP) Cyt b559. The restoration of electron flow in the Mn-depleted PSII preparations by exogenous electron donors (diphenylcarbazide, Mn2+) suppressed the light-induced formation of O2−• and H2O2. The decrease of O2−• and H2O2 photoproduction upon the restoration of electron transport in the Mn-depleted PSII preparations could be due to the re-conversion of the LP Cyt b559 into higher potential forms. It is supposed that the conversion of the high potential Cyt b559 into its LP form upon damage to the WOC leads to the increase of photoproduction of O2−• and H2O2 in PSII.

Effects of oxygen radicals on cerebral arterioles

1985 ◽  
Vol 248 (2) ◽  
pp. H157-H162 ◽  
Author(s):  
E. P. Wei ◽  
C. W. Christman ◽  
H. A. Kontos ◽  
J. T. Povlishock
Keyword(s):  
Hydrogen Peroxide ◽  
Superoxide Dismutase ◽  
Xanthine Oxidase ◽  
Superoxide Anion ◽  
Anion Radical ◽  
Superoxide Anion Radical ◽  
Residual Effects ◽  
Functional Changes ◽  
Free Hydroxyl ◽  
Cerebral Arterioles

Xanthine oxidase and xanthine, a combination that produces hydrogen peroxide and superoxide anion radical, applied topically in anesthetized cats equipped with cranial windows caused arteriolar dilation during application, sustained dilation 1 h after washout, and reduced reactivity to the vasoconstrictive effects of arterial hypocapnia, discrete lesions of the endothelium, and morphological abnormalities of the vascular smooth muscle by electron microscopy. Similar effects were seen in small, but not in large, arterioles during topical application of hydrogen peroxide or hydrogen peroxide plus ferrous sulfate, a combination that produces free hydroxyl radical. The functional changes caused by xanthine oxidase plus xanthine were inhibited completely by superoxide dismutase plus catalase. Superoxide dismutase or catalase, each by itself, eliminated the residual effects seen after washout and reduced the dilation during application of xanthine oxidase. The results show that superoxide anion radical and hydrogen peroxide produce reversible arteriolar dilation and that consistent vascular damage is produced in the presence of both superoxide anion radical and hydrogen peroxide.

scholarly journals The study of paraquat genotoxicity by bacterial lux-biosensors

2020 ◽  
pp. 63-64
Author(s):  
Э.А. Мачигов ◽  
Д.А. Свиридова ◽  
С.К. Абилев
Keyword(s):  
Hydrogen Peroxide ◽  
Superoxide Anion ◽  
Anion Radical ◽  
Superoxide Anion Radical ◽  
Dna Breaks ◽  
Lux Biosensors

Показано, что паракват (1,1-диметил-4,4дипиридилия дихлорид) индуцирует люминесценцию биосенсоров, несущих промоторы генов soxS и katG, специфично реагируюших на супероксид-анион радикал и перекись водорода, соответственно. Антиоксиданты глутатион и ацетилцистеин снижали уровень как люминесценции биосенсоров, так и разрывов ДНК в бактериальных клетках. It has been shown that paraquat (1,1-dimethyl-4,4 dipyridylium dichloride) induces luminescence of biosensors carrying the promoters of the soxS and katG genes that specifically react to the superoxide anion radical and hydrogen peroxide. The antioxidants glutathione and acetylcysteine reduced the level of biosensor luminescence and DNA breaks.

Superoxide Anion Radical: Generation and Detection in Cellular and Non-Cellular Systems

2015 ◽  
Vol 22 (37) ◽  
pp. 4234-4256 ◽  
Author(s):  
Renan Chiste ◽  
Marisa Freitas ◽  
Adriana Mercadante ◽  
Eduarda Fernandes
Keyword(s):  
Superoxide Anion ◽  
Anion Radical ◽  
Cellular Systems ◽  
Superoxide Anion Radical ◽  
Radical Generation
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