Sorry if this is old news, but in cleaning out my in box I came across this interesting 2012 paper – anaerobic methane oxidation also consumes CO2. So with a bit of biogeoengineering we can pro-actively mitigate CH4 and CO2 simultaneously, +/- take the lipid-rich biomass to produce biofuels, supplanting fossil sources??? Greg
Autotrophy as a predominant mode of carbon fixation in anaerobic methane-oxidizing microbial communities 1. Matthias Y. Kellermann<http://www.pnas.org/search?author1=Matthias+Y.+Kellermann&sortspec=date&submit=Submit>a<http://www.pnas.org/content/109/47/19321.full#aff-1>,1<http://www.pnas.org/content/109/47/19321.full#fn-3>,2<http://www.pnas.org/content/109/47/19321.full#fn-4>,3<http://www.pnas.org/content/109/47/19321.full#corresp-1>, 2. Gunter Wegener<http://www.pnas.org/search?author1=Gunter+Wegener&sortspec=date&submit=Submit>b<http://www.pnas.org/content/109/47/19321.full#aff-2>,c<http://www.pnas.org/content/109/47/19321.full#aff-3>,1<http://www.pnas.org/content/109/47/19321.full#fn-3>, 3. Marcus Elvert<http://www.pnas.org/search?author1=Marcus+Elvert&sortspec=date&submit=Submit>a<http://www.pnas.org/content/109/47/19321.full#aff-1>, 4. Marcos Yukio Yoshinaga<http://www.pnas.org/search?author1=Marcos+Yukio+Yoshinaga&sortspec=date&submit=Submit>a<http://www.pnas.org/content/109/47/19321.full#aff-1>, 5. Yu-Shih Lin<http://www.pnas.org/search?author1=Yu-Shih+Lin&sortspec=date&submit=Submit>a<http://www.pnas.org/content/109/47/19321.full#aff-1>, 6. Thomas Holler<http://www.pnas.org/search?author1=Thomas+Holler&sortspec=date&submit=Submit>c<http://www.pnas.org/content/109/47/19321.full#aff-3>, 7. Xavier Prieto Mollar<http://www.pnas.org/search?author1=Xavier+Prieto+Mollar&sortspec=date&submit=Submit>a<http://www.pnas.org/content/109/47/19321.full#aff-1>, 8. Katrin Knittel<http://www.pnas.org/search?author1=Katrin+Knittel&sortspec=date&submit=Submit>c<http://www.pnas.org/content/109/47/19321.full#aff-3>, and 9. Kai-Uwe Hinrichs<http://www.pnas.org/search?author1=Kai-Uwe+Hinrichs&sortspec=date&submit=Submit>a<http://www.pnas.org/content/109/47/19321.full#aff-1> +<http://www.pnas.org/content/109/47/19321.full> Author Affiliations 1. aOrganic Geochemistry Group, MARUM-Center for Marine Environmental Sciences and Department of Geosciences, University of Bremen, D-28359 Bremen, Germany; 2. bAlfred Wegener Institute for Polar and Marine Research, Research Group for Deep Sea Ecology and Technology, D-27515 Bremerhaven, Germany; and 3. cMax Planck Institute for Marine Microbiology, D-28359 Bremen, Germany 1. Edited by Donald E. Canfield, University of Southern Denmark, Odense M, Denmark, and approved October 5, 2012 (received for review May 24, 2012) Next Section<http://www.pnas.org/content/109/47/19321.full#sec-1> Abstract The methane-rich, hydrothermally heated sediments of the Guaymas Basin are inhabited by thermophilic microorganisms, including anaerobic methane-oxidizing archaea (mainly ANME-1) and sulfate-reducing bacteria (e.g., HotSeep-1 cluster). We studied the microbial carbon flow in ANME-1/ HotSeep-1 enrichments in stable-isotope–probing experiments with and without methane. The relative incorporation of 13C from either dissolved inorganic carbon or methane into lipids revealed that methane-oxidizing archaea assimilated primarily inorganic carbon. This assimilation is strongly accelerated in the presence of methane. Experiments with simultaneous amendments of both 13C-labeled dissolved inorganic carbon and deuterated water provided further insights into production rates of individual lipids derived from members of the methane-oxidizing community as well as their carbon sources used for lipid biosynthesis. In the presence of methane, all prominent lipids carried a dual isotopic signal indicative of their origin from primarily autotrophic microbes. In the absence of methane, archaeal lipid production ceased and bacterial lipid production dropped by 90%; the lipids produced by the residual fraction of the metabolically active bacterial community predominantly carried a heterotrophic signal. Collectively our results strongly suggest that the studied ANME-1 archaea oxidize methane but assimilate inorganic carbon and should thus be classified as methane-oxidizing chemoorganoautotrophs. -- You received this message because you are subscribed to the Google Groups "geoengineering" group. To unsubscribe from this group and stop receiving emails from it, send an email to geoengineering+unsubscr...@googlegroups.com. To post to this group, send email to geoengineering@googlegroups.com. Visit this group at http://groups.google.com/group/geoengineering. For more options, visit https://groups.google.com/groups/opt_out.
