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Any of various anaerobic archaea that produce methane as a metabolic byproduct.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(mɛˈθæn ə dʒən, -ˌdʒɛn)

any of a group of archaebacteria that occur in diverse anaerobic environments and are capable of producing methane from a limited number of chemical sources, as carbon dioxide and hydrogen.
meth•an`o•gen′ic, adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.methanogen - archaebacteria found in anaerobic environments such as animal intestinal tracts or sediments or sewage and capable of producing methane; a source of natural gas
archaebacteria, archaebacterium, archaeobacteria, archeobacteria - considered ancient life forms that evolved separately from bacteria and blue-green algae
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References in periodicals archive ?
In step 4 (methanogenic fermentation) occur the highest production of methane (C[H.sub.4]) and carbon dioxide (C[O.sub.2]), increase of pH, and reduction in the formation of leachate.
Effect of temperature on growth and activity of a methanogenic culture utilising acetate.
The third family of hydrogenases, [Fe]-hydrogenases (active site: a mononuclear Fe center), consists of only [EC]-enzymes from methanogenic Archaea (Attention: in literature before ca.
The fermentation process in a biogas digester is brought anaerobically by Methanogenic Bacteria.
In the final step, methanogenic bacteria convert the products developed in stages 1-3 (H2 + CO2 and acetate) into CH4, CO2 and trace amount of other gases as shown in the Figure 1.
[11.] Siller H and J Winter Treatment of cyanide-containing wastewater from the Food industry in a laboratory-scale fixed-bed methanogenic reactor.
This slurry was pumped into the anaerobic digestion tank and suitable methanogenic bacteria were introduced into the digester and were retained nearly for 96 hours.
Unfortunately, there are a few notable errors in the text, such as an indication that sperm do not contain mitochondria and one reversed arrow in a food chain diagram, thus showing methanogenic archaea using rather than producing methane.
Field and Lettinga (1992) reported that concentrations of tannins in the range of 325-3000 mg/l inhibit the growth of methanogenic bacteria; and concentrations of 1 - 2 % were found to reduce the overall decomposition of organic matter applied to soil.
Estrada-Vazquez C, Macarie H, Kato MT, Rodriguez-Vazquez R, Esparza-Garcia F, Poggi-Varaldo HM (2003) The effect of the supplementation with a primary carbon source on the resistance to oxygen exposure of methanogenic sludge.