Results 1 to 10 of about 69,211 (124)
Oxygen metabolism and oxygenation of the newborn [PDF]
Seminars in Fetal and Neonatal Medicine, 2020 The premature infant is to some extent protected from hypoxia, however defense against hyperoxia is poorly developed. The optimal assessment of oxygenation is to measure oxygen delivery and extraction. At the bedside PaO2 and SpO2 are approximations of oxygenation at the tissue level.
Andresen, Jannicke Hanne +1 more
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The ‘oxygen’ in oxygen minimum zones
Environmental Microbiology, 2022 AbstractAerobic processes require oxygen, and anaerobic processes are typically hindered by it. In many places in the global ocean, oxygen is completely removed at mid‐water depths forming anoxic oxygen minimum zones (A‐OMZs). Within the oxygen gradients linking oxygenated waters with A‐OMZs, there is a transition from aerobic to anaerobic microbial ...
Canfield, Donald E., Kraft, Beate
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An oxygen-reducing biocathode with “oxygen tanks” [PDF]
Chemical Communications, 2020 Polytetrafluoroethylene submicro-rod, serving as “oxygen tanks” and binders, have been mixed into Os redox polymer-based bilirubin oxidase cathodes, leading to enhanced performance.
Xinxin Xiao +2 more
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May oxygen depletion explain the FLASH effect? A chemical track structure analysis [PDF]
, 2021 Background and purpose: Recent observations in animal models show that ultra-high dose rate ("FLASH") radiation treatment significantly reduces normal tissue toxicity maintaining an equivalent tumor control. The dependence of this "FLASH" effect on target oxygenation has led to the assumption that oxygen "depletion" could be its major driving force ...
arxiv +1 more source
The oxygen trail: tissue oxygenation [PDF]
British Medical Bulletin, 1999 Aerobic cellular respiration depends on the efficient supply of oxygen and substrate to the mitochondria. There is an oxygen cascade from the environment to the subcellular environment. Efficient oxygen delivery depends on the coordinated interaction between the respiratory and circulatory systems.
M Singer, A T Nathan
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On the maximum value of the cosmic abundance of oxygen and the oxygen yield [PDF]
Mon.Not.Roy.Astron.Soc.376:353-360,2007, 2007 We search for the maximum oxygen abundance in spiral galaxies. Because this maximum value is expected to occur in the centers of the most luminous galaxies, we have constructed the luminosity - central metallicity diagram for spiral galaxies, based on a large compilation of existing data on oxygen abundances of HII regions in spiral galaxies.
arxiv +1 more source
Breathe, 2019 The September issue of Breathe focuses on medical oxygen http://bit.ly/2M83NLo.
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Constraining the rise of oxygen with oxygen isotopes [PDF]
Nature Communications, 2019 AbstractAfter permanent atmospheric oxygenation, anomalous sulfur isotope compositions were lost from sedimentary rocks, demonstrating that atmospheric chemistry ceded its control of Earth’s surficial sulfur cycle to weathering. However, mixed signals of anoxia and oxygenation in the sulfur isotope record between 2.5 to 2.3 billion years (Ga) ago ...
Pascal Philippot +6 more
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Bonding, Conductance and Magnetization of Oxygenated Au Nanowires [PDF]
Phys. Rev. Lett. 100, 046801 (2008), 2013 Spin-density-functional calculations of tip-suspended gold chains, with molecular oxygen, or dissociated oxygen atoms, incorporated in them, reveal structural transitions for varying lengths. The nanowires exhibit enhanced strength for both oxygen incorporation modes, and upon stretching tip atoms join the wire.
arxiv +1 more source
Hydrogen/nitrogen/oxygen defect complexes in silicon from computational searches [PDF]
Phys. Rev. B 80, 144112 (2009), 2009 Point defect complexes in crystalline silicon composed of hydrogen, nitrogen, and oxygen atoms are studied within density-functional theory (DFT). Ab initio Random Structure Searching (AIRSS) is used to find low-energy defect structures. We find new lowest-energy structures for several defects: the triple-oxygen defect, {3O}, triple oxygen with a ...
arxiv +1 more source