ライフサイエンスコーパス: methane

1 1,10-phenanthroline; pyr(3) = tris-2-pyridyl-methane).

2 es and subsequently activate the C-H bond of methane.

3 rs of groundwater aquifer contamination with methane.

4 photoelectrochemical CO(2) reduction toward methane.

5 mmonia due to its structural similarities to methane.

6 lakes known to contain bacteria that oxidize methane.

7 rial genomes, thus contributing to growth on methane.

8 Q, the diiron(IV) oxidant that hydroxylates methane.

9 their cooperative action converted CO(2) to methane.

10 d for syngas production via dry reforming of methane.

11 ed Ni/MgO catalysts for the dry reforming of methane.

12 out to simulate the benchmark combustion of methane.

13 denitrifiers could have used reduced iron or methane.

14 ic and chemical data in areas with microbial methane.

15 can influence decadal changes in atmospheric methane.

16 te the quantities and sources of groundwater methane.

17 inventories, may be a significant source of methane.

18 s the most efficient catalysts for producing methane.

19 and led to enrichment of (13) C in residual methane.

20 sary to attack the highly inert C-H bonds of methane.

21 or the reaction of Criegee intermediate with methane.

22 fied lakes, where they use oxygen to oxidize methane.

23 a circulation-induced enrichment of gaseous methane a few kilometres above Pluto's plains that favou

24 ve the potential to emit large quantities of methane, a potent greenhouse gas, as the Earth continues

25 to assemble a structural model of the potent methane-activating intermediate as a Pd(III) dimer with

26 A predictive model for methane activation catalysis follows, which suggests tha

27 Methane activation is the rate-limiting step, while the

28 yet challenges persist mostly in relation to methane activation under mild conditions.

29 (3) surfaces acts as a judicious oxidant for methane activation with mitigated CO(2) formation, even

30 genation, alkane and cycloalkane metathesis, methane activation, metathetic oxidation, CO(2) activati

31 ntly, a protein coregulated with particulate methane and ammonia monooxygenases.

32 ML predictions for the methane and carbon dioxide adsorption capacities of seve

33 We demonstrate that biogenic methane and ethylene from terrestrial and freshwater bac

34 e oxidation (n-DAMO), up to 85% of dissolved methane and more than 99% of nitrogen were removed in pa

35 n pig manure while simultaneously inhibiting methane and odorant (H(2)S and VOC) emissions.

36 The presence of methane and other hydrocarbons in domestic-use groundwat

37 tron spectroscopy showed that water added to methane and oxygen led to surface methoxy groups and acc

38 er column, but their responses to changes in methane and sulfate supplies remain poorly constrained.

39 one production, increases in the lifetime of methane, and increases in atmospheric aerosol production

40 bon-13 ((13)C) and deuterium (D) isotopes of methane, and several combustion tracers.

41 xposure may affect microbial communities and methane- and sulfur-cycling gene abundances in Arctic ma

42 Anaerobic oxidation of methane (AOM) and methanogenesis (MOG) primarily occur a

43 rogenotrophic pathway-from CO(2) and H(2) to methane-as the terminal step of microbial biomass degrad

44 enzyme methane monooxygenase that activates methane at ambient conditions in nature.

45 By introducing methane at low pressures into the H(2)S + H(2) precursor

46 phylococcus hominis yielded hydrogen, but no methane, authentifying observational data.Three patients

47 observed atmospheric increases in the global methane burden.

48 tion conditions and the isotopic labeling of methane by deuterium allow for an unambiguous identifica

49 oups of hydrocarbons are reviewed, including methane/C(2) hydrocarbons, normal alkanes, alkane isomer

50 centrations and stable isotope signatures of methane, carbon dioxide and nitrate and monitored microb

51 rrent density of (108 +/- 5) mA cm(-2) and a methane cathodic energy efficiency of 20% using a dilute

52 s (GHGs), but to what extent soil release of methane (CH(4) ) and nitrous oxide (N(2) O) may contribu

53 een shown to account for over half of annual methane (CH(4) ) emissions and can offset summer photosy

54 While recent studies have shown that methane (CH(4) ) emissions can potentially offset the ca

55 In this context, methane (CH(4) ) emissions in the non-growing season, pa

56 Methane (CH(4) ), a potent greenhouse gas, can form in t

57 n and consumption of nitrous oxide (N(2) O), methane (CH(4) ), and carbon dioxide (CO(2) ) are affect

58 The discovery of methane (CH(4)) accumulation in oxic marine and limnic w

59 Hydrogen (H(2)) and methane (CH(4)) breath tests are a cheap and non-invasiv

60 Warming exponentially increased methane (CH(4)) emissions and enhanced CH(4) production

61 most effective C sinks of the biosphere, but methane (CH(4)) emissions can offset their climate cooli

62 The AD-composting process avoids methane (CH(4)) emissions from landfilling, but emission

63 Methane (CH(4)) emissions from oil and gas activities ar

64 idle wells, and ~63,000 active wells, whose methane (CH(4)) emissions remain largely unquantified at

65 e of storing a relatively high amount of dry methane (CH(4)) in the adsorbed phase are largely explor

66 The accelerated increase in global methane (CH(4)) in the atmosphere, accompanied by a decr

67 Atmospheric methane (CH(4)) is a potent greenhouse gas, and its mole

68 Methane (CH(4)) is emitted from lakes by several process

69 Our compound exhibits a higher methane (CH(4)) sorptivity as compared to CO(2) at 25 de

70 and modelling simulations allow the study of methane (CH(4)) sources and sinks at any geographic loca

71 Methane (CH(4)), a potent gas with a global warming pote

72 e major emitters of both ammonia (NH(3)) and methane (CH(4)).

73 pendectomies had decreased levels of exhaled methane (CH(4)).

74 2)S) and carbon dioxide (CO(2)) reduction to methane (CH(4)).

75 second largest natural source of atmospheric methane (CH(4)).

76 lobal emissions of the potent greenhouse gas methane (CH(4)).

77 cally depleted carbon source, such as marine methane clathrates, is therefore not required.

78 In the Uintah Basin in Utah, TROPOMI methane columns correlated with in-situ measurements, an

79 n the Permian Basin in Texas and New Mexico, methane columns showed maxima over regions with the high

80 y effective and thermally stable to catalyze methane combustion at low temperatures (<500 degrees C)

81 sponsible for the sudden rise of atmospheric methane concentration (XCH(4)) since 2007, but remains d

82 Elevated methane concentrations were found in only one aquifer, a

83 emperature and pressure with different added methane concentrations.

84 as chemical parameters for predicting sample methane concentrations.

85 kilometres above Pluto's plains that favours methane condensation at mountain summits.

86 xide-rich ice and/or energetic processing of methane condensed on water ice grains in the cold, outer

87 AOM than sulfate reduction rates at in situ methane conditions were observed, making alternative ele

88 s underlying these results: eCO(2) increased methane-consuming microorganisms more strongly in soils

89 d (605 mL g(-1) VS(fed)) with 22.4% enhanced methane content for 30 mg L(-1) IONPs supplemented bioma

90 ulative enhancements in biomass, biogas, and methane content proffered a net rise of 98.63% in biomet

91 ts (C(2) H(6) /C(2) H(4) ) from conventional methane conversion have not been produced commercially o

92 This suggests that oil-to-methane conversion is limited by the recalcitrant nature

93 ions, which greatly facilitates the CO(2) to methane conversion.

94 nly supplies insights into the mechanisms of methane coupling reactions but also illustrates how the

95 ses to demonstrate the presence of a cryptic methane cycle in sulfate-reducing sediments from the con

96 Saturn's moon Titan has a methane cycle with clouds, rain, rivers, lakes, and seas

97 s driven methane production drives a cryptic methane cycling and fuels AOM coupled to the reduction o

98 etary model, we find that pre-photosynthetic methane-cycling microbial ecosystems are much less produ

99 focuses on recent fundamental insights about methane dehydroaromatization (MDA) to benzene over ZSM-5

100 Because methane dehydrogenation by metal cations M(+) typically

101 We present ice core isotopic measurements of methane (Delta(14)C, delta(13)C, and deltaD) from the la

102 The methane deposits may not result from adiabatic cooling i

103 Results show that methane dissolution is affected by heterogeneity, active

104 emissions of greenhouse gases, in particular methane, due to the microbial anaerobic fermentation of

105 d to predict the production of total gas and methane during the fermentation periods, which showed go

106 Methane effluxes were higher in fire-affected areas (7.8

107 Pluto is covered by numerous deposits of methane, either diluted in nitrogen or as methane-rich i

108 We report stable methane electrosynthesis for 22 h.

109 Moreover, prediction of methane emission by VFA indicators could be useful for i

110 A detailed site-level methane emission estimation model is used to estimate th

111 uction regions, often reporting results as a methane emission intensity (methane emitted as a percent

112 subsets of wells, can increase the lifecycle methane emission intensity by up to a factor of 2-3, bet

113 poral evolution of methane emissions and the methane emission intensity for a variety of well configu

114 letion flowbacks raise the average lifecycle methane emission intensity from 0.79 to 0.81% for flowba

115 Methane emission intensity shows complex behavior becaus

116 f a flare can decrease the average lifecycle methane emission intensity to 0.23%.

117 ane emissions from a production site and the methane emission intensity would be expected to evolve o

118 atially and statistically analyze 598 direct methane emission measurements from abandoned oil and gas

119 This study derives methane emission rates from 92 airborne observations col

120 Methane emission rates range from 0 to 190 kg/h with 95%

121 Basin-wide methane emission rates were estimated for the production

122 For methane emission reduction strategies in urban areas to

123 metabolite signals to be used as proxies of methane emissions (CH(4) in g/kg DMI).

124 sites will improve inventories and models of methane emissions and clarify pathways toward mitigation

125 oaches to accurately estimate facility-scale methane emissions and perform source attribution at subf

126 s used to estimate the temporal evolution of methane emissions and the methane emission intensity for

127 Annual measurement-based sectorwide methane emissions are 19,000 +/- 2300 Mg for refineries,

128 Significant methane emissions at composting facilities indicate that

129 ts and find that lower-bound reported annual methane emissions averaged 22.1 Gg (-16.9, +19.5) betwee

130 We measured small but detectable methane emissions from 34 of 97 AP wells (mean emission:

131 apshots of methane emissions; however, total methane emissions from a production site and the methane

132 Understanding methane emissions from abandoned oil and gas wells can p

133 We find that annual methane emissions from abandoned wells are underestimate

134 Our results also indicate that methane emissions from biomass burning in the pre-Indust

135 mission measurements in China and found high methane emissions from heavy-duty NGVs (90% higher than

136 trophic bacteria play a key role in limiting methane emissions from lakes.

137 Methane emissions from natural gas appliances remain the

138 cities have highlighted the contribution of methane emissions from natural gas distribution networks

139 64 northern California homes to (1) quantify methane emissions from natural gas leaks and incomplete

140 Many recent studies have reported methane emissions from oil and gas production regions, o

141 Our results show that methane emissions from old carbon reservoirs in response

142 ace-based monitoring for annual reporting of methane emissions from point sources and suggest that fu

143 stry emissions could double by 2030, so that methane emissions from the charcoal industry could outco

144 contributes to uncertainty in inventories of methane emissions from the natural gas supply chain.

145 We estimate methane emissions from U.S. local distribution natural g

146 ate change mitigation, but a renewal of high methane emissions has been reported for these ecosystems

147 nfidence interval) and argue against similar methane emissions in response to future warming.

148 backs with uncontrolled emissions, lifecycle methane emissions increase to 1.26%.

149 lls are one of the most uncertain sources of methane emissions into the atmosphere.

150 aks in U.S. distribution mains, resulting in methane emissions of 0.69 Tg/year (95% cr int: 0.25, 1.2

151 two emitters accounting for 20% of the total methane emissions of all sampled sites.

152 re a common but poorly constrained source of methane emissions to the atmosphere.

153 y not be an effective measure for mitigating methane emissions unless best management practices are i

154 und that the old peat contribution to annual methane emissions was large (~30%) compared to intact we

155 Methane emissions were likewise estimated at 10.6 Gg mon

156 seems to be a suitable approach to decrease methane emissions, a relevant cleaner effect that may co

157 ia has the potential to significantly reduce methane emissions, it is unclear if enough farmland exis

158 Despite higher methane emissions, tankless water heaters generate 29% l

159 studies have been instantaneous snapshots of methane emissions; however, total methane emissions from

160 ing results as a methane emission intensity (methane emitted as a percentage of natural gas produced

161 confirm that the waste sector is the largest methane emitter in the GTA.

162 trument (TROPOMI) launched in 2017 that show methane enhancements over production regions in the Unit

163 Species measured at 1 s include methane, ethane, carbon-13 ((13)C) and deuterium (D) iso

164 ated from the formation of coproducts CO and methane, except for hydrogen activation on the Pt NPs.

165 e also find that the pair of CO(2) and C(1) (methane) exhibit a separate pattern of mutual isotopic e

166 To address how methane exposure may affect microbial communities and me

167 blooms, potentially triggered by a period of methane famine.

168 We achieve as a result a methane Faradaic efficiency (FE) of (48 +/- 2)% with a p

169 y silicon photoelectrodes with an impressive methane Faradaic efficiency of up to 51%, leading to a d

170 Our ability to interpret observed methane fluxes in reflooded peatlands and make predictio

171 es by ratioing VOCs measured in canisters to methane fluxes measured in the field.

172 on, chamber-measured net ecosystem exchange, methane fluxes) as well as experimental treatments (hete

173 that aqueous dissolution removed >95% of the methane from ~3.5 mm live oil droplets within 14.5 min,

174 des a foundation for understanding its rapid methane functionalization reactivity.

175 as attractive targets for engineering novel methane functionalizing enzymes.

176 signatures that may be useful indicators of methane gas migration, potentially from nearby coal seam

177 reas for the onboard storage of hydrogen and methane gas-alternatives to conventional fossil fuels.

178 ation of *CO to *CHO, a key intermediate for methane generation, compared to the competing step, C-C

179 e simplest Criegee intermediate CH(2)OO with methane has been performed using the density functional

180 Methane hydrate ([Formula: see text]) is an ice-like sol

181 Permafrost and methane hydrates are large, climate-sensitive old carbon

182 Isoprene (C(5)H(8)) is the main non-methane hydrocarbon emitted into the global atmosphere.

183 cluster ions catalyze the transformation of methane in a gas-phase ion trap experiment via nonoxidat

184 erobic methanotrophic archaea (ANME) consume methane in marine sediments, limiting its release to the

185 less dramatic than previous observations of methane in other basins, it is more prominent than that

186 be an important driver of the conversion of methane in oxygen-limited lake systems and potentially u

187 e the dominant natural source of atmospheric methane in terrestrial and shallow-water areas; in deep-

188 longevity of both free- and dissolved-phase methane in the subsurface.

189 ne resources require efficient conversion of methane into liquid chemicals, whereas an ambient select

190 Methane is a potent greenhouse gas; methane production a

191 entifying and quantifying where and how much methane is being released into the ocean remains a major

192 Methane is biologically produced and oxidized until sedi

193 l region of Cthulhu, bright frost containing methane is observed coating crater rims and walls as wel

194 e/methane ratios around 5.3% and (13)C and D methane isotopic compositions around -40 and -240 per mi

195 mages caused by criteria air pollutants, and methane leakage from the natural gas infrastructure.

196 tude than the climate benefits, (3) reducing methane leakage rates from 2.3 to 2.0% increases the net

197 c carbon burial are the dominant controls on methane leakage since the Early Cretaceous.

198 The impact of active methane leakage versus stopping of leakage was investiga

199 h by $1.1B-$1.4B, (4) although internalizing methane leakage, climate damages, and health damages in

200 a powerful marker for active as well as past methane leaks.

201 ntal implications when gas components (e.g., methane, longer-chained hydrocarbons) dissolve into shal

202 trophs persisted for weeks in the absence of methane, making them a powerful marker for active as wel

203 he last two decades; an increasing number of methane measurements are being made with such systems as

204 sion of CO(2) to fuels and chemicals such as methane, methanol, and C(2+) hydrocarbons or syngas are

205 of this type for the selective conversion of methane might proceed further.

206 tervals allowed for understanding of coupled methane migration and mass transfer.

207 8 to August 2019, we collected 77 surveys of methane mixing ratios, covering a distance of about 6400

208 mpetition between ammonium and CH(4) for the methane mono-oxygenase enzyme.

209 Soluble methane monooxygenase (sMMO) carries out methane oxidati

210 In soluble methane monooxygenase enzymes (sMMO), dioxygen (O(2)) is

211 analogous to that of the methanotroph enzyme methane monooxygenase that activates methane at ambient

212 atically critical subunit of the particulate methane monooxygenase, the predominant methane oxidation

213 p in both of these processes is catalyzed by methane monooxygenase, which converts methane or ammonia

214 ave the ability to anaerobically oxidize non-methane multi-carbon alkanes such as ethane and n-butane

215 The activation of methane occurs at the single iron site, whereas the diss

216 The direct, nonoxidative conversion of methane on a silica-confined single-atom iron catalyst i

217 bon atoms for the nonoxidative conversion of methane on Fe(1) (C)SiO(2) and this surface process is i

218 zed by methane monooxygenase, which converts methane or ammonia into methanol or hydroxylamine, respe

219 anol, being electron rich and derivable from methane or CO(2), is a potentially renewable one-carbon

220 otrophic or organotrophic consortium cycling methane or nitrogen.

221 Isoprene is the dominant non-methane organic compound emitted to the atmosphere(1-3).

222 exacerbate these contributions by elevating methane outputs associated with animal production.

223 mox with nitrite/nitrate-dependent anaerobic methane oxidation (n-DAMO) microorganisms, at a temperat

224 ox) with nitrite/nitrate-dependent anaerobic methane oxidation (n-DAMO), up to 85% of dissolved metha

225 ble methane monooxygenase (sMMO) carries out methane oxidation at 4 degrees C and under ambient press

226 ic and anoxic incubations both showed active methane oxidation by a Methylobacter species, with anoxi

227 system for enhanced methanol productivity in methane oxidation by in situ generated hydrogen peroxide

228 Thus, augmentation of bacterial methane oxidation by pmoC-phages during infection could

229 ulate methane monooxygenase, the predominant methane oxidation catalyst in nature.

230 NME-1 archaea and SRB, with the capacity for methane oxidation coupled to sulfate reduction, which is

231 performing high-rate (up to 72 muM day(-1) ) methane oxidation in the anoxic hypolimnion of the tempe

232 Nitrate did not enhance methane oxidation under oxygen limitation.

233 Methane oxidation was strictly dependent on oxygen avail

234 proof-of-concept, particularly for selective methane oxidation, hydrogen production, water splitting,

235 RA, anammox, and nitrite-dependent anaerobic methane oxidation.

236 tics, CO(2) hydrogenation, C-C coupling, and methane oxidation.

237 sms experienced thirty-five weeks of dynamic methane, oxygen and nitrate concentrations.

238 o methanol under a reaction environment with methane, oxygen, and water.

239 During the methane partial oxidation reaction, NO and NO(2) were no

240 dustrial Holocene were 22 to 56 teragrams of methane per year (95% confidence interval), which is com

241 er national emissions of 1290 [1246-1342] Gg methane per year or 66% [64-69%] of current GHGI estimat

242 glacial warming were small (<19 teragrams of methane per year, 95% confidence interval) and argue aga

243 Satellite observations of atmospheric methane plumes offer a means for global mapping of metha

244 e plumes offer a means for global mapping of methane point sources.

245 Further, the biochemical methane potential (BMP) test was done for IONPs suppleme

246 However, 20-60% of the methane produced remains dissolved in the anaerobically

247 d as a percentage of natural gas produced or methane produced).

248 ice paddy soils and stimulates the growth of methane-producing microorganisms.

249 without straw, with the opposite pattern for methane-producing microorganisms.

250 Methane is a potent greenhouse gas; methane production and consumption within seafloor sedim

251 results suggest that methyl-compounds driven methane production drives a cryptic methane cycling and

252 0) = 2.1) and vegetated (Q(10) = 2.3) soils, methane production from both fresh and old carbon source

253 Surprisingly, the catalytic activity for methane production increased significantly after every r

254 e oils to ruminant mixed rations will reduce methane production increasing the formation of propionic

255 eration cycle, reaching more than double the methane production rate after eight regeneration cycles.

256 retreatment showed a progressive decrease in methane production rates and poor process stability, lea

257 based waste pretreatments also produced high methane production rates but with some process instabili

258 Methane production reveals an additional bacterial pathw

259 The highest rate of methane production was 0.15 mumol CH(4) g(-1) oil d(-1)

260 Methane production was monitored for over 3000 days.

261 Methane production was reduced by 21-28% (P < 0.001), pr

262 etween individual sites, with typical ethane/methane ratios around 5.3% and (13)C and D methane isoto

263 inetic isotope effects (KIEs) for the di-pai-methane rearrangement of benzobarrelene fit with statist

264 anced the secondary H(2) formation via steam methane reforming and water-gas shift reactions.

265 uous mesocosms with groundwater from a field methane release experiment.

266 g, we estimate that 18-27 of the 23-31 Tg of methane released at the seafloor could have reached the

267 responses to potential large-scale seafloor methane releases in ways that provide insight for future

268 set of lakes > 50 degrees N, classified with methane-relevant criteria.

269 MO archaea indeed contributed jointly to the methane removal.

270 The abundant yet widely distributed methane resources require efficient conversion of methan

271 Here we report that they are composed of methane-rich ice.

272 of methane, either diluted in nitrogen or as methane-rich ice.

273 289-299] reported laboratory experiments on methane-saturated oil droplets under emulated deep-water

274 Seafloor methane seepage is a significant source of carbon in the

275 an attendant low carbon monoxide (5.6%) and methane selectivity (10.4%).

276 at abandoned wells remain the most uncertain methane source in the U.S. and become the most uncertain

277 However, CO(2)RR to methane still suffers from low selectivity at commercial

278 Under these conditions, the excess amount of methane stored in the pores of Cr-soc-MOF-1 in the form

279 ](4+) (SD/Ag78a; dppm=bis-(diphenylphosphino)methane) that was synthesized through a one-pot reaction

280 nt enabled the direct selective oxidation of methane to dimethyl ether (DME) over Pt/Y(2) O(3) .

281 ts are selective in the direct conversion of methane to HCHO and CO (~94% selectivity with a HCHO/CO

282 Highly selective oxidation of methane to methanol has long been challenging in catalys

283 ethanol produced in the partial oxidation of methane to methanol over Cu-SSZ-13 in a continuous-flow

284 Selective partial oxidation of methane to methanol suffers from low efficiency.

285 Q that performs the challenging oxidation of methane to methanol.

286 ing zeolites for the selective conversion of methane to methanol.

287 to allow diffusion of hydrogen, oxygen, and methane to the catalyst active sites, while confining th

288 primarily occur at the depth of the sulfate-methane transition zone or underlying sediment respectiv

289 ones (upon reaction with CO(2) ) and then to methane (upon reaction with hydrogen), simultaneously re

290 Effective methane utilization for either clean power generation or

291 Widespread seafloor methane venting has been reported in many regions of the

292 o global warming gases of carbon dioxide and methane via dry reforming is environmentally crucial and

293 t methanotrophs make a living from oxidizing methane via methanol to carbon dioxide.

294 tion are complex mixtures including ammonia, methane, volatile organic compounds (VOC), and H(2)S.

295 g CO(2) and dissociating hydrogen to produce methane was achieved.

296 , and warming by other greenhouse gases like methane was not a major factor, the mean surface tempera

297 text]) is an ice-like solid that forms from methane-water mixture under elevated-pressure and low-te

298 the highest activity and selectivity toward methane with an extremely high faradaic efficiency of ~6

299 The photochemical reaction of methane with EHP (pathway E1) was found to be the most p

300 These findings offer routes to produce methane with high FE and high conversion rate in CO(2)RR