Results 21 to 30 of about 68,582 (266)
Oxidation of Ammonia with Molecular Complexes
Journal of the American Chemical Society, 2020 Oxidation of ammonia by molecular complexes is a burgeoning area of research, with critical scientific challenges that must be addressed. A fundamental understanding of individual reaction steps is needed, particularly for cleavage of N-H bonds and formation of N-N bonds.
Peter L. Dunn +4 more
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Ammonia-oxidizing archaea have more important role than ammonia-oxidizing bacteria in ammonia oxidation of strongly acidic soils [PDF]
The ISME Journal, 2011 Abstract Increasing evidence demonstrated the involvement of ammonia-oxidizing archaea (AOA) in the global nitrogen cycle, but the relative contributions of AOA and ammonia-oxidizing bacteria (AOB) to ammonia oxidation are still in debate. Previous studies suggest that AOA would be more adapted to ammonia-limited oligotrophic conditions,
Li-Mei, Zhang +3 more
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iScience, 2023 Summary: An electrochemical approach for ammonia production is successfully developed by coupling the anodic dinitrogen oxidation reaction (NOR) and cathodic hydrogen evolution reaction (HER) within a well-designed membraneless flow electrolyzer.
Jing-Jing Lv +3 more
doaj +1 more source
Phanerozoic radiation of ammonia oxidizing bacteria [PDF]
Scientific Reports, 2019 Abstract The modern nitrogen cycle consists of a web of microbially mediated redox transformations. Among the most crucial reactions in this cycle is the oxidation of ammonia to nitrite, an obligately aerobic process performed by a limited number of lineages of bacteria (AOB) and archaea (AOA). As this process has
Ward, LM, Johnston, DT, Shih, PM
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Mesoscale Eddy Effects on Nitrogen Cycles in the Northern South China Sea Since the Last Glacial
Frontiers in Earth Science, 2022 Archaeal ammonia oxidation is the most important intermediate pathway in regulating the oceanic nitrogen cycle; however, the study of its specific role on a geological time scale is restricted to a specific part of marginal seas; thus far, only in the ...
Miao Chen +5 more
doaj +1 more source
Environment International, 2021 17α-ethynylestradiol (EE2) is a priority emerging contaminant (EC) in diverse environments that can be cometabolized by ammonia oxidizing bacteria (AOB). However, its transformation kinetics and the underlying molecular mechanism are unclear.
Qi Sheng, Ming Yi, Yujie Men, Huijie Lu
doaj +1 more source
Testing the influence of light on nitrite cycling in the eastern tropical North Pacific [PDF]
BiogeosciencesLight is considered a strong controlling factor of nitrification rates in the surface ocean. Previous work has shown that ammonia oxidation and nitrite oxidation may be inhibited by high light levels, yet active nitrification has been measured in the ...
N. M. Travis +5 more
doaj +1 more source
Gas-Phase and Aqueous Photocatalytic Oxidation of Methylamine: The Reaction Pathways
International Journal of Photoenergy, 2007 Photocatalytic oxidation (PCO) of methylamine (MA) on titanium dioxide in aqueous and gaseous phases was studied. A simple batch glass reactor for aqueous PCO and an annular continuous flow reactor for the gas-phase PCO were used.
Anna Kachina +3 more
doaj +1 more source
Journal of Industrial Microbiology & Biotechnology, 2008 For biological nitrification, a set of experiments were carried out to approximate the response of lag period along with ammonia oxidation rate with respect to different concentrations of cyanide (CN-) and ammonia-oxidizing bacteria (AOB), and temperature variation in laboratory-scale batch reactors.
Do, H +5 more
openaire +3 more sources
Microbiome‐blood–brain barrier interactions in aging — mechanisms and therapeutic potential
FEBS Letters, EarlyView.Aging reshapes the gut microbiome (↓SCFA‐producing commensals; ↑pro‐inflammatory outputs), shifting circulating metabolites (↓SCFAs; ↑LPS, ↑TMAO, ↑PAA) that act at the BBB to increase nonspecific transcytosis, alter transport, and promote astrocyte reactivity, heightening brain vulnerability.
Daniel Cuervo‐Zanatta +3 more
wiley +1 more source