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Climate-friendly microbes recycle carbon without making methane

May 6, 2021 at 11:00 am
Earth’s hot springs and hydrothermal vents are home to a previously unidentified group of archaea. And, unlike similar tiny, single-celled organisms that live deep in sediments and munch on decaying plant matter, these archaea don’t produce the climate-warming gas methane, researchers report April 23 in
Nature Communications.
“Microorganisms are the most diverse and abundant form of life on Earth, and we just know 1 percent of them,” says Valerie De Anda, an environmental microbiologist at the University of Texas at Austin. “Our information is biased toward the organisms that affect humans. But there are a lot of organisms that drive the main chemical cycles on Earth that we just don’t know.” ....

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Sulfate-dependent reversibility of intracellular reactions explains the opposing isotope effects in the anaerobic oxidation of methane

13). Farther from equilibrium, kinetic effects contribute to the net isotopic fractionation, and the usually faster reaction of the substrate molecules containing the light isotopes of carbon and hydrogen results in reaction products that are depleted in the heavy isotopes relative to the substrates. Methanogenesis and methane oxidation under far-from-equilibrium conditions should, therefore, show opposing isotopic effects on methane, respectively depleting and enriching the methane in the heavy isotopes (relative to CO
2 and H
13C and δD values (
14). Moreover, experiments with psychrophilic and mesophilic AOM enrichments incubated at seawater sulfate levels (28 mM) yielded methane that was enriched in
13C and D (relative to CO ....

Candidatus Desulfofervidus , Vienna Pee Dee Belemnite , Vienna Standard Mean Ocean Water , Guaymas Basin , வியன்னா தரநிலை சராசரி கடல் தண்ணீர் , கூாய்மச் பேசின் ,