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Any of various anaerobic archaea that produce methane as a metabolic byproduct.


(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.
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
References in periodicals archive ?
Rumenshield dairy acts upon methanogenic bacteria in the rumen.
These methanogenic bacteria associated with rumen protozoa are apparently responsible for 9 to 25% of methanogenesis, but this can be reduced by around 13% when the protozoa are killed; however, this reduction occurs when the animal consumes starchy diets, which is when the protozoa generate more [H.sub.2], which is not the case when the diets are high in forage resulting in less methane formation (30).
The importance of methanogenic bacteria associated with ciliate protozoa was estimated either by removing protozoa from whole rumen fluid or by isolating the protozoa.
The methanogenic bacteria. In: The Prokaryotes, 2nd ed A handbook on the biology of bacteria.
King, "Utilization of hydrogen, acetate, and "noncompetitive"; substrates by methanogenic bacteria in marine sediments," Geomicrobiology Journal, vol.
Classification of aligned reads in a FunGene database resulted in the identification of 14 different species of methanogenic bacteria and 2 uncultured/unclassified archaeal species.
In total, 4133 methanogenic bacteria were classified into Archaea domain and Crenarchaeota and Euryarchaeota are most visible group [33].
Increased dried distillers grains with solubles (DDGS) inclusion and decreased corn particle size have been shown to lower ruminal pH and reduce methanogenic bacteria and hydrogen production.
[8] studied anaerobic degradation of indole by a consortium of methanogenic bacteria that degraded indole to methane within seven to eighteen weeks.
(iii) pH: the methanogenic bacteria achieve greater productivity with pH between 6.8 and 7.2.
Protection of methanogenic bacteria from low pH and toxic materials by immobilization using polyvinyl alcohol.