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Methane Oxidation - Wiley Online Library

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Last Updated: 03 May 2022

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Anaerobic methane oxidation in a coastal oxygen minimum zone: spatial and temporal dynamics

Coastal waters are a significant source of marine methane to the atmosphere. Here we investigate the long-term evolution of methanotrophic production and the methanotroph community in Golfo Dulce, Costa Rica's coastal oxygen minimum zone, combining biogeochemical analysis, experimental incubations, and 16S rRNA gene sequencing over three years. Our findings show a stable redox zonation over the years with high methane levels in anoxic bottom waters. However, we also observed high levels of anaerobic methane oxidation in the OMZ core.

Source link: https://onlinelibrary.wiley.com/doi/10.1111/1462-2920.16003


Positron‐emitting radiotracers spatially resolve unexpected biogeochemical relationships linked with methane oxidation in Arctic soils

Abstract of Arctic soils are characterized by cryoturbic features, which influence soilatmosphere methane dynamics, which are critical to global climate control. By adding soluble organic carbon and nutrients, possibly affecting microbial CH4 oxidation, Cryoturbin diapirism alters C/N chemistry within frost boils. Inherently heterogeneous natural soil matrices, spatial delineation of microbial activity with respect to these key microbial and biogeochemical factors at relevant scales is experimentally difficult. CH4 uptake spatially associates with higher amounts of inorganic N in diapiric frost boils according to X-ray absorption spectroscopic speciation of living and inactive areas. Ralstonia pickettii is associated with CH4 uptake in soils, as well as important CH4 and inorganic N metabolism associated genes, according to metagenomic results. In addition, our experimental framework provides a novel, highly applicable way for investigating ecosystems under global change.

Source link: https://onlinelibrary.wiley.com/doi/10.1111/gcb.16188


Aerobic and anaerobic methane oxidation in a seasonally anoxic basin

Global marine methane waters in Shallow's coastal waters are dynamic environments that dominate global marine methane emissions. In Mariager Fjord, Denmark's shallow eutrophic water column, we investigate how the seasonal growth of anoxia affected methane concentrations, rates of methane oxidation, and community assemblage of methanotrophs. However, the fjord had an effective microbial methane filter near the oxic-anoxic interface that responded to the increasing methane flux. Both aerobic and anaerobic methane oxidation rates were high enough to consume the estimated methane flux during the time.

Source link: https://onlinelibrary.wiley.com/doi/10.1002/lno.12074


Titanium Superoxide for the Oxidation of Amines: Synthesis of bis(3‐nitro‐1H‐1,2,4‐triazol‐5‐yl)methane and its Metal Salts

Through the oxidation of 5,5'diamino methylene1,4,4's triazole with titanium superoxide in a water and hydrogen peroxide solution, Bismethane was synthesized in 79 percent yield. All the salts were less responsive to corrosion than neutral BNTM and, except for the sodium and cesium salts, were less susceptible to friction. To analyze the crystal structures obtained for the cesium, strontium, and sodium salts, single crystal X-ray crystallography was used.

Source link: https://onlinelibrary.wiley.com/doi/10.1002/zaac.202200007


Ammonia, nitrous oxide and methane emissions from excreta of cattle receiving rumen undegradable protein

Using the semi-open static chamber technique, we analyzed N2O and CH4 emissions using a static closed chamber and NH3 emissions. Regardless of the supplement type, there were higher NH3 losses for the urine treatments in the end period. For the middle and end periods, respectively, the mean NH3 emission factor for urine was 2. 96 and 13. 8%, respectively, while the mean value for dung was 3. 9%. The supplement did not have a effect on CH4 emissions, and the mean dung emission factor was 0. 12 kg CH4 head–1 year–1. Excreta, NH3, N2O, and CH4 emissions from RUP supplemented beef cattle in pastures did not reduce NH3, N2O, and CH4 emissions from excreta. Regardless of differences in the type of excreta, type of supplement, and period, the excreta emission factors for the GHGs tested were lower than the Intergovernmental Panel on Climate Change revised guidelines' default setting.

Source link: https://onlinelibrary.wiley.com/doi/10.1002/agj2.21053


Interannual Variability in Methane and Nitrous Oxide Concentrations and Sea‐Air Fluxes Across the North American Arctic Ocean (2015–2019)

Methane and nitrous oxide concentrations in the North American Arctic Ocean increased by almost 2,000 water column measurements from 2015 to 2018. In midsummer 2017, we also obtained 25 samples of CH4 and N2O in rivers along the Northwest Passage and Ellesmere Island. Chukchi and Beaufort Sea sediments are a significant source of CH4 to the water column. The importance of CH4 oxidation is shown by the study's results, which are mixed. At the time of year sampled, we found that rivers are not a major source of CH4 or N2O to the Arctic Ocean. Tg N y 1st, 0. 01 Tg CH4 y1 and 0. 013 Tg N y1 respectively, a median of 0. 009 Tg N y1 and 0. 003 Tg N y 1, respectively. These results reveal that the North American Arctic Ocean currently plays a negligible role in global CH4 and N2O budgets.

Source link: https://onlinelibrary.wiley.com/doi/10.1029/2021GB007185


How to Improve Cumulative Methane and Nitrous Oxide Flux Estimations of the Non‐Steady‐State Chamber Method?

We investigated the effect of FCSs and GSSs on cumulative methane and nitrous oxide flux estimates at the field scale, based on a database obtained from automated chamber experiments in a permafrost-affected wetland in northeast China. The evolution of chamber headspace gas concentrations was divided into five patterns, illustrating measurement error and a variation of non-steady chamber techniques. On the basis of data evolution patterns of chamber headspace gas concentrations, Three FCSs, i. e. the sole use of linear model and hybrid use of linear with empirical quadratic and exponential models, were developed. The hybrid FCSs were more robust for cumulative flux estimates than the linear model's sole FCS. The flux dataset with the high spatiotemporal accuracy was subsampled to simulate datasets obtained with different GSSs. Our guidance on FCS and GSSs can contribute to the improvement of non-steady chamber methodologies.

Source link: https://onlinelibrary.wiley.com/doi/10.1029/2021JG006641


Low‐temperature total oxidation of methane by pore‐ and vacancy‐engineered NiO catalysts

Low-temperature combustion catalysts operating under low temperatures is a significant challenge, especially for noble–metal–free catalytic systems. With NaCl as a crystalline scaffold, NiO catalyst with abundant oxygen vacancies and ultra-specific surface area of 181 m2 g1 are obtained. The mesoporous NiO exhibits outstanding CH4 combustion results.

Source link: https://onlinelibrary.wiley.com/doi/10.1002/aic.17664

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions