Directional oxygen activation by oxygen-vacancy-rich WO2 nanorods for superb hydrogen evolution via formaldehyde reforming

2019 ◽  
Vol 7 (24) ◽  
pp. 14592-14601 ◽  
Author(s):  
Kaicheng Qian ◽  
Leilei Du ◽  
Xiaohui Zhu ◽  
Shipan Liang ◽  
Shuang Chen ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Oxygen Vacancy ◽  
Molecular Oxygen ◽  
Hydrogen Evolution ◽  
Reactive Oxygen ◽  
Oxygen Activation ◽  
Oxygen Species ◽  
Precise Control ◽  
Catalytic Processes

Molecular oxygen activation (MOA) into reactive oxygen species (ROS) is extremely crucial in numerous catalytic processes, while precise control of ROS products remains difficult.

Progress in understanding the molecular oxygen paradox – function of mitochondrial reactive oxygen species in cell signaling

2017 ◽  
Vol 398 (11) ◽  
pp. 1209-1227 ◽  
Author(s):  
Nidhi Kuksal ◽  
Julia Chalker ◽  
Ryan J. Mailloux
Keyword(s):  
Reactive Oxygen Species ◽  
Molecular Oxygen ◽  
Reactive Oxygen ◽  
Oxygen Metabolism ◽  
Antioxidant Systems ◽  
Oxygen Species ◽  
Oxygen Paradox ◽  
Secondary Messenger ◽  
Cell Structures ◽  
By Products

AbstractThe molecular oxygen (O2) paradox was coined to describe its essential nature and toxicity. The latter characteristic of O2is associated with the formation of reactive oxygen species (ROS), which can damage structures vital for cellular function. Mammals are equipped with antioxidant systems to fend off the potentially damaging effects of ROS. However, under certain circumstances antioxidant systems can become overwhelmed leading to oxidative stress and damage. Over the past few decades, it has become evident that ROS, specifically H2O2, are integral signaling molecules complicating the previous logos that oxyradicals were unfortunate by-products of oxygen metabolism that indiscriminately damage cell structures. To avoid its potential toxicity whilst taking advantage of its signaling properties, it is vital for mitochondria to control ROS production and degradation. H2O2elimination pathways are well characterized in mitochondria. However, less is known about how H2O2production is controlled. The present review examines the importance of mitochondrial H2O2in controlling various cellular programs and emerging evidence for how production is regulated. Recently published studies showing how mitochondrial H2O2can be used as a secondary messenger will be discussed in detail. This will be followed with a description of how mitochondria use S-glutathionylation to control H2O2production.

Molecular Oxygen and Reactive Oxygen Species in Bread-making Processes: Scarce, but Nevertheless Important

2015 ◽  
Vol 56 (5) ◽  
pp. 722-736 ◽  
Author(s):  
Karolien Decamps ◽  
Iris J. Joye ◽  
Dirk E. De Vos ◽  
Christophe M. Courtin ◽  
Jan A. Delcour
Keyword(s):  
Reactive Oxygen Species ◽  
Molecular Oxygen ◽  
Reactive Oxygen ◽  
Oxygen Species ◽  
Bread Making

The production of reactive oxygen species enhanced with the reduction of menadione by active thioredoxin reductase

Metallomics ◽  
2019 ◽  
Vol 11 (9) ◽  
pp. 1490-1497 ◽  
Author(s):  
Jing Li ◽  
Xin Zuo ◽  
Ping Cheng ◽  
Xiaoyuan Ren ◽  
Shibo Sun ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Molecular Oxygen ◽  
Thioredoxin Reductase ◽  
Reactive Oxygen ◽  
Semiquinone Radical ◽  
Ros Production ◽  
Oxygen Species ◽  
Reduction Mechanism ◽  
Radical Intermediate ◽  
Electron Reduction

TXNRD1 participates in the ROS production with menadione by a one-electron reduction mechanism. TXNRD1 transfers electrons from NADPH to menadione to yield a semiquinone radical intermediate, which reacts with molecular oxygen to generate ROS.

scholarly journals Mechanism of the Formation of Electronically Excited Species by Oxidative Metabolic Processes: Role of Reactive Oxygen Species

Biomolecules ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 258 ◽  
Author(s):  
Pavel Pospíšil ◽  
Ankush Prasad ◽  
Marek Rác
Keyword(s):  
Reactive Oxygen Species ◽  
Molecular Oxygen ◽  
Reactive Oxygen ◽  
High Energy ◽  
Oxygen Species ◽  
Human Beings ◽  
Metabolic Processes ◽  
Excited Species ◽  
Electronically Excited

It is well known that biological systems, such as microorganisms, plants, and animals, including human beings, form spontaneous electronically excited species through oxidative metabolic processes. Though the mechanism responsible for the formation of electronically excited species is still not clearly understood, several lines of evidence suggest that reactive oxygen species (ROS) are involved in the formation of electronically excited species. This review attempts to describe the role of ROS in the formation of electronically excited species during oxidative metabolic processes. Briefly, the oxidation of biomolecules, such as lipids, proteins, and nucleic acids by ROS initiates a cascade of reactions that leads to the formation of triplet excited carbonyls formed by the decomposition of cyclic (1,2-dioxetane) and linear (tetroxide) high-energy intermediates. When chromophores are in proximity to triplet excited carbonyls, the triplet-singlet and triplet-triplet energy transfers from triplet excited carbonyls to chromophores result in the formation of singlet and triplet excited chromophores, respectively. Alternatively, when molecular oxygen is present, the triplet-singlet energy transfer from triplet excited carbonyls to molecular oxygen initiates the formation of singlet oxygen. Understanding the mechanism of the formation of electronically excited species allows us to use electronically excited species as a marker for oxidative metabolic processes in cells.

Activation of dissolved molecular oxygen by Cu(0) for bisphenol a degradation: Role of Cu(0) and formation of reactive oxygen species

Chemosphere ◽  
2020 ◽  
Vol 241 ◽  
pp. 125034 ◽  
Author(s):  
Jiajun Long ◽  
Longqian Xu ◽  
Linghui Zhao ◽  
Huaqiang Chu ◽  
Yunfeng Mao ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Bisphenol A ◽  
Molecular Oxygen ◽  
Reactive Oxygen ◽  
Oxygen Species

SiO2@Cu7S4 nanotubes for photo/chemodynamic and photo-thermal dual-mode synergistic therapy under 808 nm laser irradiation

2020 ◽  
Vol 8 (26) ◽  
pp. 5707-5721
Author(s):  
Mingdi Sun ◽  
Dan Yang ◽  
Wu Fanqi ◽  
Zhao Wang ◽  
Hongjiao Ji ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Photodynamic Therapy ◽  
Laser Irradiation ◽  
Molecular Oxygen ◽  
Reactive Oxygen ◽  
Oxygen Species ◽  
Tumor Treatment ◽  
Dual Mode

Photodynamic therapy (PDT) is a light-based modality for tumor treatment that involves the generation of reactive oxygen species (ROS) by the combination of light, a photosensitizer, and molecular oxygen.

scholarly journals The effective in vivo mitochondrial-targeting nanocarrier combined with a π-extended porphyrin-type photosensitizer

2021 ◽  
Author(s):  
Satrialdi . ◽  
Yuta Takano ◽  
Eri Hirata ◽  
Natsumi Ushijima ◽  
H. Harashima ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Photodynamic Therapy ◽  
Cancer Therapy ◽  
Molecular Oxygen ◽  
Photochemical Reaction ◽  
Reactive Oxygen ◽  
Oxygen Species ◽  
Mitochondrial Targeting

A photochemical reaction mediated by light-activated molecules (photosensitizers) in photodynamic therapy (PDT) causes molecular oxygen to be converted into highly reactive oxygen species (ROS) that is beneficial for cancer therapy....

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