Pyrene effects on methanotroph community and methane oxidation rate, tested by dose–response experiment and resistance and resilience experiment

2010 ◽  
Vol 11 (2) ◽  
pp. 312-321 ◽  
Author(s):  
Huan Deng ◽  
Guang-Xia Guo ◽  
Yong-Guan Zhu
Keyword(s):  
Methane Oxidation ◽  
Dose Response ◽  
Oxidation Rate ◽  
Methane Oxidation Rate

The link between Soil Methane Oxidation Rate and Abundance of Methanotrophs Estimated by Quantitative PCR

Microbiology ◽  
2020 ◽  
Vol 89 (2) ◽  
pp. 182-191
Author(s):  
A. F. Sabrekov ◽  
M. V. Semenov ◽  
I. E. Terent’eva ◽  
Yu. V. Litti ◽  
D. V. Il’yasov ◽  
...  
Keyword(s):  
Methane Oxidation ◽  
Quantitative Pcr ◽  
Oxidation Rate ◽  
Methane Oxidation Rate ◽  
Soil Methane Oxidation

Self-oscillations of methane oxidation rate over Pd/Al2O3 catalysts: Role of Pd particle size

2016 ◽  
Vol 77 ◽  
pp. 103-107 ◽  
Author(s):  
V.Yu. Bychkov ◽  
Yu.P. Tulenin ◽  
M.M. Slinko ◽  
A.K. Khudorozhkov ◽  
V.I. Bukhtiyarov ◽  
...  
Keyword(s):  
Particle Size ◽  
Methane Oxidation ◽  
Oxidation Rate ◽  
Methane Oxidation Rate

scholarly journals Methane oxidation potential of the arctic wetland soils of a taiga-tundra ecotone in northeastern Siberia

2019 ◽  
Author(s):  
Jun Murase ◽  
Atsuko Sugimoto ◽  
Ryo Shingubara ◽  
Tomoki Morozumi ◽  
Shinya Takano ◽  
...  
Keyword(s):  
Methane Oxidation ◽  
Oxidation Rate ◽  
Time Lag ◽  
Soil Samples ◽  
The Arctic ◽  
Wetland Soils ◽  
Oxidation Rates ◽  
Northeastern Siberia ◽  
Water Saturated ◽  
Methane Oxidation Rate

Abstract. Arctic wetlands are significant sources of atmospheric methane and the observed accelerated climate changes in the arctic could cause the change in methane dynamics, where methane oxidation would be the key process to control methane emission from wetlands. In this study we determined the potential methane oxidation rate of the wetland soils of a taiga-tundra transition zone in northeastern Siberia. Peat soil samples were collected in summer from depressions covered with tussocks of sedges and Sphagnum spp. and from mounds vegetated with moss and larch trees. A bottle incubation experiment demonstrated that the soil samples collected from depressions in the moss- and sedge-dominated zones exhibited active methane oxidation with no time lag. The potential methane oxidation rates at 15 °C ranged from 94 to 496 nmol h−1 g−1 dw. Methane oxidation was observed over the depths studied (0–40 cm) including the water-saturated anoxic layers. The maximum methane oxidation rate was recorded in the layer above the water-saturated layer: the surface (0–2 cm) layer in the sedge-dominated zone and in the middle (4–6 cm) layer in the moss-dominated zone. The methane oxidation rate was temperature-dependent, and the threshold temperature of methane oxidation was estimated to be −4 to −11 °C, which suggested methane oxidation at subzero temperatures. Soil samples collected from the frozen layer of Sphagnum peat also showed immediate methane consumption when incubated at 15 °C. The present results suggest that the methane oxidizing bacteria in the wetland soils keep their potential activities even under anoxic and frozen conditions and immediately utilize methane when the conditions become favorable. On the other hand, the inhibitor of methane oxidation did not affect the methane flux from the sedge and moss zones in situ, which indicated the minor role of plant-associated methane oxidation.

UK landfill methane emissions: Use of mobile plume measurements and carbon isotopic characterisation to reassess oxidation rates for open and closed sites 

2021 ◽  
Author(s):  
Semra Bakkaloglu ◽  
Dave Lowry ◽  
Rebecca Fisher ◽  
James France ◽  
Euan Nisbet
Keyword(s):  
Methane Oxidation ◽  
Mole Fraction ◽  
Oxidation Rate ◽  
Methane Emissions ◽  
Isotopic Signature ◽  
Oxidation Rates ◽  
Landfill Cover ◽  
Carbon Isotopic ◽  
Landfill Sites ◽  
The Impact

<p>Biological methane oxidation in landfill cover material can be characterised using stable isotopes. Methane oxidation fraction is calculated from the carbon isotopic signature of emitted CH<sub>4</sub>, with enhanced microbial consumption of methane in the aerobic portion of the landfill cover indicated by a shift to less depleted isotopic values in the residual methane emitted to air. This study was performed at four southwest England landfill sites. Mobile mole fraction measurement at the four sites was coupled with Flexfoil bag sampling of air for high-precision isotope analysis. Gas well samples collected from the pipeline systems and downwind plume air samples were utilized to estimate methane oxidation rate for whole sites. This work was designed to assess the impact on carbon isotopic signature and oxidation rate as UK landfill practice and waste streams have changed in recent years.</p><p>The landfill status such as closed and active, seasonal variation, cap stripping and site closure impact on landfill isotopic signature and oxidation rate were evaluated. The isotopic signature of <sup>13</sup>C-CH<sub>4</sub> values of emissions varied between -60 and -54‰, with an averaged value of -57 +- 2‰ for methane from closed and active landfill sites. Methane emissions from older, closed landfill sites were typically more enriched in <sup>13</sup>C than emissions from active sites. This study found that the isotopic signature of <sup>13</sup>C-CH<sub>4</sub> of fugitive methane did not show a seasonal trend, and there was no plume observed from a partial cap stripping process to assess changes in <sup>13</sup>C-CH<sub>4</sub>  isotopic signatures of emitted methane. Also, the closure of an active landfill cell caused a significant decrease in mole fraction of measured CH<sub>4</sub>, which was less depleted <sup>13</sup>C in the emitted plume due to a higher oxidation rate. Methane oxidation, estimated from the isotope fractionation, ranged from 3 to 27%, with mean values of 7% and 15% for active and closed landfills, respectively. These results indicate that the oxidation rate is highly site specific.</p><p> </p>

scholarly journals Methane distribution and oxidation around the Lena Delta in summer 2013

2017 ◽  
Author(s):  
Ingeborg Bussmann ◽  
Steffen Hackbusch ◽  
Patrick Schaal ◽  
Antje Wichels
Keyword(s):  
Methane Oxidation ◽  
Methane Flux ◽  
Methanotrophic Bacteria ◽  
Riverine Water ◽  
Lena River ◽  
Methane Distribution ◽  
Methane Oxidation Rate ◽  
Mixed Water ◽  
Polar Water ◽  
Lena Delta

Abstract. The Lena River is one of the biggest Russian rivers draining into the Laptev Sea. Due to predicted increasing temperatures, the permafrost areas surrounding the Lena Delta will melt at increasing rates. With this melting, high amounts of methane will reach the waters of the Lena and the adjacent Laptev Sea. Methane oxidation by methanotrophic bacteria is the only biological way to reduce methane concentrations within the system. However, the polar estuary of the Lena River is a challenging environment for bacteria, with strong fluctuations in salinity and temperature. We determined the activity (tracer method) and the abundance (qPCR) of aerobic methanotrophic bacteria. We described the methanotrophic population with MISA; as well as the methane distribution (head space) and other abiotic parameters in the Lena Delta in September 2013. In riverine water (S < 5) we found a median methane concentration of 22 nM, in mixed water (5 < S < 20) the median methane concentration was 19 nM and in polar water (S > 20) a median 28 nM was observed. The Lena River was not the methane source for surface water, and bottom water methane concentrations were mainly influenced by the concentration in surface sediments. However, the methane oxidation rate in riverine and polar water was very similar (0.419 and 0.400 nM/d), but with a higher relative abundance of methanotrophs and a higher estimated diversity with respect to MISA OTUs in the rivine water as compared to polar water. The turnover times of methane ranged from 167 d in mixed water, 91 d in riverine water and only 36 d in polarwater. Also the environmental parameters influencing the methane oxidation rate and the methanotrophic population differed between the water masses. Thus we postulate a riverine methanotrophic population limited by sub-optimal temperatures and substrate concentrations and a polar methanotrophic population being well adapted to the cold and methane poor environment, but limited by the nitrogen content. The diffusive methane flux into the atmosphere ranged from 4–163 µmol m2 d−1 (median 24). For the total methane inventory of the investigated area, the diffusive methane flux was responsible for 8 % loss, compared to only 1 % of the methane consumed by the methanotrophic bacteria within the system.

scholarly journals Effects of trace volatile organic compounds on methane oxidation

2001 ◽  
Vol 44 (2) ◽  
pp. 135-140 ◽  
Author(s):  
Wilai Chiemchaisri ◽  
Chettiyappan Visvanathan ◽  
Shing Wu Jy
Keyword(s):  
Volatile Organic Compounds ◽  
Methane Oxidation ◽  
Organic Compounds ◽  
Competitive Inhibition ◽  
Attachment Site ◽  
Batch Experiments ◽  
Toxicity Effect ◽  
Volatile Organic ◽  
Key Enzyme ◽  
Methane Oxidation Rate

The effects of volatile organic compounds (VOCs) on methane oxidation in landfill cover soils were examined. The batch experiments were conducted using single and mixed VOCs, such as, dichloromethane (DCM), trichloroethylene (TCE), tetrachloroethylene (PCE), and benzene. The results from all combinations showed a decrease in methane oxidation rate with increase in VOC concentrations. Moreover, inhibition effects of TCE and DCM were found higher than benzene and PCE. The reduction of methane oxidation by benzene and PCE could be attributed to the toxicity effect, whereas TCE and DCM were found to exhibit the competitive-inhibition effect. When the soil was mixed with DCM, no methane oxidation was found. Damage to the cell’s internal membrane was found in a methanotrophic culture exposed to VOC gases which is the attachment site of a key enzyme needed for methane oxidation

Dose-Response Effects of p -Synephrine on Fat Oxidation Rate During Exercise of Increasing Intensity

2017 ◽  
Vol 32 (2) ◽  
pp. 370-374 ◽  
Author(s):  
Jorge Gutiérrez-Hellín ◽  
Juan Del Coso
Keyword(s):  
Dose Response ◽  
Oxidation Rate ◽  
Fat Oxidation
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