Query: NC_009464:2523092 Uncultured methanogenic archaeon RC-I, complete genome Lineage: Methanocella arvoryzae; Methanocella; Methanocellaceae; Methanocellales; Euryarchaeota; Archaea General Information: This organism is a key methane producer in the rhizome of rice. A large portion of the methane that is emitted in rice fields is produced by methanogenic archaea. Rice Cluster I (RC-I) methanogens in the rice rhizosphere play a key role in this methane production.
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General Information: This symbiotic and thermophilic bacterium was discovered by screening for thermostable tryptanophases in Japanese compost. Cultured growth of this organism requires the presence of another bacterial species, such as a Bacillus or Escherichia coli, which provides diffusable metabolites required for its growth. Pure cultures can be obtained by growing Symbiobacterium thermophilum in a bioreactor, separated from its symbiotic counterpart by a dialysis membrane. Because of its symbiotic nature, it cannot be cultured with conventional methods. Despite a negative reaction for gram stain, this species is placed with the gram-positive bacteria based on 16s phylogenetic analysis.