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Methane Oxidation - DOAJ

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Last Updated: 03 May 2022

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Soil methane oxidation in both dry and wet temperate eucalypt forests shows a near-identical relationship with soil air-filled porosity

In a wet temperature eucalypt forest in Tasmania, we investigated the effect of environmental factors on the seasonal and inter-annual variation of the soil–atmosphere CH 4 exchange, including in a wet temperature eucalypt forest. Also, the connection between soil moisture and soil CH 4 flux was near-identical at both forest sites, where soil moisture was described as soil-filled porosity. Soil temperature had only a small effect on soil CH 4 uptake. Our findings show that soil MOB activity in the two forests was similar, and that differences in soil CH4 exchange between the two forests were attributed to differences in soil moisture and subsequently soil gas diffusivity. The differences between forest sites and the changes in soil CH4 exchange over time may be explained by soil AFP as an indicator of soil moisture status.

Source link: https://doi.org/10.5194/bg-14-467-2017


Active and Stable Methane Oxidation Nano-Catalyst with Highly-Ionized Palladium Species Prepared by Solution Combustion Synthesis

In addition, HTEM reported that larger Pd particles were surrounded by CeO2, resembling a core shell unit, while smaller Pd particles were not associated with CeO2. Pd ions were introduced into the ceria lattice and were associated with the decline of Ce4+ ions to Ce3+ ions, reducing the formation of oxygen vacancies as a result of the close Pd-CeO2 attachment; Pd0, Pd2+, and heavily ionized Pd ions, which may have attributed to Pd0, Pd2+, and notably ionized Pd ions, which could have arisen from the insertion of Pd ions into the ceria lattice, according to XPS. Pd-SCS nano-catalysts were more versatile and stable than conventional catalysts, according to the study. The methane combustion rate over the SCS catalyst was 18. 8% higher than that of conventional catalysts under similar reaction conditions. Conversions of SCS catalysts occurred at about 400 °C, but were not shown at all with conventional catalysts.

Source link: https://doi.org/10.3390/catal8020066


Methane Oxidation in Landfill Cover Soils: A Review

Both humankind and the climate are negatively impacted by migration of methane gas from landfills to the surrounding area. It is therefore vital to develop control methods to reduce CH4 emissions from landfills to minimize global warming and minimize human risks associated with CH4 gas migration, which is also important to minimize human risks associated with CH4 migration. The most effective CH4 mitigation measure for CH4 emissions mitigation is oxidation of CH4 in landfill cover soil. This paper seeks to explore the critical issues surrounding the CH4 oxidation process in landfill cover soils.

Source link: https://doi.org/10.5572/ajae.2014.8.1.001


Geographic and seasonal variation of dissolved methane and aerobic methane oxidation in Alaskan lakes

Oxygenation of lake CH4 and oxygen levels is mostly dependent on lake CH4 and oxygen levels, in such a way that higher MO rates are typically found at the oxic/anoxic interface, where both molecules are present. We investigated CH4 oxidation rates in 30 Alaskan lakes along a north-south latitudinal transect during winter and summer with a new field laser spectroscopy technique, according to the current study. We found that aerobic CH 4 oxidation was mainly controlled by the dissolved O 2 concentration in the winter, while in the summer, it was mainly controlled by the CH 4 concentration, which was low in comparison to dissolved O 2 dissolved O 2. In non-yedoma permafrost lakes, thermokarst lakes that occurred in yedoma-type permafrost had significantly higher CH4 oxidation rates compared to other thermokarst and non-thermokarst lakes constituted in non-yedoma permafrost lakes.

Source link: https://doi.org/10.5194/bg-12-4595-2015


Nitrate decreases methane production also by increasing methane oxidation through stimulating NC10 population in ruminal culture

Since addition of nitrate, more methane can be oxidized in rumen, according to the present study, an alternative method of denitrifying anaerobic methane oxidizing bacteria, DAMO archaea, and anammox bacteria can coexist in rumen. The addition of 5 mM NaNO3, 4 mM NH4Cl, or both in the culture substrate on methane production, fermentation methods, and population of methanogens, NC10 and anaerotrophic-2d was tested using a Ruminal batch culture model. We found that NC10 in the ruminal culture was identified by polymerase chain reaction after using NC10 special primer sets, as well as increased the relative proportion of NC10 in the ruminal culture, as shown by polymerase chain reaction. When using ANME-2d special primer sets, we did not find DAMO archaea in ruminal culture by real-time PCR.

Source link: https://doi.org/10.1186/s13568-017-0377-2


Biogeochemical evidence of anaerobic methane oxidation and anaerobic ammonium oxidation in a stratified lake using stable isotopes

Two microbially mediated steps that can reduce nitrogen loading of aquatic ecosystems and associated methane emissions to the atmosphere are n-damo, nitrate-dependent anaerobic methane oxidation, and ammonium anaerobic oxidation and anaerobic oxidation of ammonium. A methane-nitrate transition zone was discovered in a water depth from 12 to 20 meters, where 13 C values of methane and 15 N and 18 O of dissolved nitrate steadily increased in concert with decreasing concentrations of methane and nitrate. During an anammox conversion of nitrite and nitrate, a change of nitrite and nitrite is explained by an increasing offset of 26 between nitrite and nitrite values at a water depth of 20 meters compared to the 15 N nitrite fractionation of 11 m in the NMTZ at a water depth of 16 to 18 m. According to AOM and anammox, respectively, the highest concentrations of bacteria identified as culprits in n-damo/denitrification with AOM and ammonium oxidation zones were highest in the methane and ammonium oxidation zones, respectively, along with increased concentrations of bacteria known to be involved in n-damo/denitrification. This report reveals the possibility of a coupling of microbially mediated nitrate-dependent methane oxidation with anammox in stratified freshwater ecosystems, which could play a role in lake contamination and nitrogen levels.

Source link: https://doi.org/10.5194/bg-17-5149-2020


Granular activated carbon assisted nitrate-dependent anaerobic methane oxidation-membrane bioreactor: Strengthening effect and mechanisms

Anaerobic Methane Oxidation, which is a bioprocess coupling reduction with anaerobic methane oxidation, can be used to address both environmental issues simultaneously. In the NdAMO-MBR system, the nitrate removal rate in GAC-NdAMO-MBR was increased by three folds, with an estimated 31. 85 2. 02 mgNl1d d1 and a one of 0. 35 3. 19 mgN1d1. Without GAC, the membrane flux decay rate of GAC-NdAMO -MBR was 0. 15 L/m2hd, while without GAC, but without GAC, and the addition of GAC could have prolonged membrane fouling time for 2. 5 times. Following GAC's addition, the relative abundance of NdAMO bacteria increased from 27. 1 percent to 59%, while the NdAMO archaea showed a similar pattern. To minimize internal fouling, the mechanical strength of GAC scoured membrane surface reduced external fouling and pores absorbed EPS to minimize internal fouling. The combined effects may have enhanced NdAMO microorganism growth and metabolism capacity, as well as improved nitrogen removal results and monitored membrane fouling.

Source link: https://doi.org/10.1016/j.envint.2020.105675


Inhibition of methane oxidation by nitrogenous fertilizers in a paddy soil

The effect of ammonium on methane oxidation activity was investigated in a paddy soil using urea at concentrations of 0, 50, 100, 200, and 400 g N/g N/g. d. w. s. In addition, although no statistically significant association was found between amoA gene and amoA gene abundances, methane oxidation activity was highly correlated with nitrification activity in the presence of urea or ammonium sulfate. Our results indicate that the methane oxidation activity in paddy soils could be limited when ammonium fertilizer levels are high, and that the interactions between ammonia and methane oxidizers should be investigated further.

Source link: https://doi.org/10.3389/fmicb.2012.00246


Long-term impact of the Deepwater Horizon oil well blowout on methane oxidation dynamics in the northern Gulf of Mexico

Between May and July 2010, the Deepwater Horizon oil well blowout discharged unprecedented amount of methane into the water column of the northern Gulf of Mexico's northern Gulf of Mexico's northern Gulf of Mexico's northern Gulf of Mexico's northern Gulf of Mexico's northern Gulf. The methane community bloomed in reaction to continued methane leakage, resulting in the highest methane oxidation rates in an open ocean environment to date. The first study of methane oxidation rate measurements in an offshore ocean environment was determined by methane concentration and methane oxidation rates at 31 separate locations, resulting in the collection of 900 discrete water column samples around the northern Gulf ecosystem. These findings reveal that Gulf-wide circulation patterns dispersed and redistributed methanotrophic biomass that bloomed and accumulated in the aftermath of the Deepwater Horizon blowout, as well as other methanotrophic activity for many years after the blowout at levels above average background levels.

Source link: https://doi.org/10.1525/elementa.332


Water dispersal of methanotrophic bacteria maintains functional methane oxidation in Sphagnum mosses

It is known that Sphagnum-associated methanotrophy changes with the peatland water table level are correlated. Sphagna lacking SAM activity were transplanted into flark water next to Sphagna oxidizing CH4 in an experiment. The MOB community compositions of the transplants and the initial active mosses had become more similar within 28 days, indicating MOB movement through water between mosses, according to Microarray results, showing MOB movement via water. SAM inactive mosses were bathed overnight in non-sterile and sterile-filtered SAM active site flark water in a subsequent experiment. Only mosses bathed with non-sterile flark water became SAM active, as shown by the pmoA's copy number increase of over 60 times. Thus, it was clear that MOB in the water would colonize Sphagnum mosses. This colonization may serve as a resilience mechanism for peatland CH4 dynamics by allowing the re-emergence of CH4 oxidation activity in Sphagnum to be restored.

Source link: https://doi.org/10.3389/fmicb.2012.00015

* 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