Results 31 to 40 of about 845,575 (359)
The Case and Context for Atmospheric Methane as an Exoplanet Biosignature [PDF]
PNAS 119, 14, 1-10 (2022), 2022 Methane has been proposed as an exoplanet biosignature. Imminent observations with the James Webb Space Telescope may enable methane detections on potentially habitable exoplanets, so it is essential to assess in what planetary contexts methane is a compelling biosignature.
arxiv +1 more source
Water enables mild oxidation of methane to methanol on gold single-atom catalysts
Nature Communications, 2021 As a 100% atom-economy process, direct oxidation of methane into methanol remains as a grand challenge due to the dilemma between activation of methane and over-oxidation of methanol.
Laihao Luo +7 more
semanticscholar +1 more source
Methane formation and methane oxidation by methanogenic bacteria [PDF]
Journal of Bacteriology, 1979 Methanogenic bacteria were found to form and oxidize methane at the same time. As compared to the quantity of methane formed, the amount of methane simultaneously oxidized varied between 0.3 and 0.001%, depending on the strain used. All the nine tested strains of methane producers (Methanobacterium ruminantium, Methanobacterium strain M.o.H., M ...
Alexander J. B. Zehnder, Thomas D. Brock
openaire +3 more sources
Widespread abiotic methane in chromitites [PDF]
, 2018 Recurring discoveries of abiotic methane in gas seeps and springs in ophiolites and peridotite massifs worldwide raised the question of where, in which rocks, methane was generated.
Etiope, G. +8 more
core +1 more source
Research progress on coal mine laser methane sensor [PDF]
, 2019 This paper discusses the research progress of low-power technology of laser methane sensors for coal mine. On the basis of environment of coal mines, such as ultra-long-distance transmission and high stability, a series of studies have been carried out ...
Grattan, K. T. V. +10 more
core +1 more source
The Missing Link: Early Methane ("T") Dwarfs in the Sloan Digital Sky Survey [PDF]
Astrophys.J.536:L35-L38,2000, 2000 We report the discovery of three cool brown dwarfs which fall in the effective temperature gap between the latest L dwarfs currently known, with no methane absorption bands in the 1-2.5um range, and the previously known methane (T) dwarfs, whose spectra are dominated by methane and water.
arxiv +1 more source
Methane and Nitrogen Abundances On Pluto and Eris [PDF]
, 2010 We present spectra of Eris from the MMT 6.5 meter telescope and Red Channel Spectrograph (5700-9800 angstroms; 5 angstroms per pix) on Mt. Hopkins, AZ, and of Pluto from the Steward Observatory 2.3 meter telescope and Boller and Chivens spectrograph ...
Brown +17 more
core +2 more sources
Methane, 2022 Biogas upgrading by a catalytic process has been studied in order to obtain syngas using renewable source of methane. This work evaluates the influence of metal dopant (Gd, Sm, and Zr) on the CeO2 structure for the dry reforming of methane over Ni ...
André L. A. Marinho +5 more
doaj +1 more source
Global Biogeochemical Cycles, 2019 Atmospheric methane grew very rapidly in 2014 (12.7 ± 0.5 ppb/year), 2015 (10.1 ± 0.7 ppb/year), 2016 (7.0 ± 0.7 ppb/year), and 2017 (7.7 ± 0.7 ppb/year), at rates not observed since the 1980s.
E. G. Nisbet +22 more
semanticscholar +1 more source
Acoustic estimates of methane gas flux from the seabed in a 6000 km2 region in the Northern Gulf of Mexico [PDF]
, 2014 Seeps of free methane gas escaping the seabed can be found throughout the ocean basins. To understand the role of methane gas seeps in the global carbon cycle—including both gas added to the atmosphere and that which is dissolved and potentially oxidized
Dave Lovalvo +5 more
core +3 more sources