Results 251 to 260 of about 3,884,700 (306)

Oxygen and Evolution

Science, 2007
Changes in atmospheric oxygen concentration may be linked to key evolutionary events during the past 550 million years.
Robert A. Berner, John M. VandenBrooks, Peter D. Ward   +2 more
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Timescales of Oxygenation Following the Evolution of Oxygenic Photosynthesis

Origins of Life and Evolution of Biospheres, 2015
Among the most important bioenergetic innovations in the history of life was the invention of oxygenic photosynthesis-autotrophic growth by splitting water with sunlight-by Cyanobacteria. It is widely accepted that the invention of oxygenic photosynthesis ultimately resulted in the rise of oxygen by ca. 2.35 Gya, but it is debated whether this occurred
Lewis M. Ward, Joseph L. Kirschvink, Woodward W. Fischer   +2 more
openaire   +3 more sources

MOF-derived electrocatalysts for oxygen reduction, oxygen evolution and hydrogen evolution reactions

Chemical Society Reviews, 2020
The morphology and composition design of MOF-derived carbon-based materials and their applications for electrocatalytic ORR, OER and HER are reviewed.
Hao-Fan Wang, Liyu Chen, Huan Pang, Stefan Kaskel, Qiang Xu   +4 more
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The origin and evolution of oxygenic photosynthesis

Trends in Biochemical Sciences, 1998
The evolutionary developments that led to the ability of photosynthetic organisms to oxidize water to molecular oxygen are discussed. Two major changes from a more primitive non-oxygen-evolving reaction center are required: a charge-accumulating system and a reaction center pigment with a greater oxidizing potential. Intermediate stages are proposed in
R E, Blankenship, H, Hartman
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Evolution of Oxygen by Plants in Relation to Biosphere Evolution

Origins of Life, 1974
The process of water decomposition by plants is discussed in connection with biosphere evolution. This process consists of two parts: water oxidation and oxygen evolution. The origin of the water oxidation process took place after the synthesis of chlorine-type pigments, the structure of which corresponds to a more oxidized state than the ...
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Evolution of Oxygenic Photosynthesis

Annual Review of Earth and Planetary Sciences, 2016
The origin of oxygenic photosynthesis was the most important metabolic innovation in Earth history. It allowed life to generate energy and reducing power directly from sunlight and water, freeing it from the limited resources of geochemically derived reductants. This greatly increased global primary productivity and restructured ecosystems. The release
Fischer, Woodward W., Hemp, James, Johnson, Jena E.   +2 more
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Oxygen toxicity and microbial evolution

Biosystems, 1991
It is postulated that the role of oxygen toxicity in the evolution of life strongly depends on the origin of molecular oxygen, due to the strong redox buffering capacity of Precambrian waters containing large amounts of ferrous and manganese cations. The critical selective pressure could be observed only after aerobic photosynthesis had been developed,
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Oxygen and the evolution of life

Choice Reviews Online, 2011
Oxygen, its nature and chemistry.- What is so special about this element? - A brief history of oxygen.- Coping with oxygen.- Aerobic metabolism - benefits from an oxygenated world.- Facilitated oxygen transport.- Climate over the ages is the environment stable? - Global warming: human intervention in world climate. - Oxygen in medicine.- Oxygen and the
Heinz Decker, Kensal E. van Holde
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The oxygen evolution on La0.5Ba0.5CoO3

Journal of Electroanalytical Chemistry and Interfacial Electrochemistry, 1981
Abstract An alternative mechanism with two adsorbed intermediates is proposed for the oxygen evolution on La0.5Ba0.5CoO3 in 1–6 M potassium hydroxide solution, in connection with previously reported experimental results. The dc and ac behaviour is derived, the latter both by a simple and a more rigorous method. The rigorous method gives an analytical
A.G.C. Kobussen, G.H.J. Broers
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Photosynthetic Oxygen Evolution

2020
Photosynthetic oxygen evolution rate is an important physiological index, which can be used to evaluate the ability of oxygenic organisms to utilize light and inorganic carbon. By using different inhibitors of the photosynthetic electron transport chain and an artificial electron donor/acceptor, the activity of photosynthetic electron transport can ...
Guozheng Dai, Hualing Mi, Baosheng Qiu
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