11. It lives in syntrophic coculture with a methanogen . 12. Besides methanogens , acetogens, and sulfate-reducing bacteria can participate in IHT. 13. Hydrogen-consuming organisms include methanogens , sulfate-reducers, acetogens, and others. 14. Several species of methanogens have been characterized that express enzymes in the Hmd hydrogenase family. 15. This organism actually has three major electron acceptors : formate, methoxymonobenzenoids, or methanogens . 16. Some types of methanogens even live in the stomach of cows where they help digest grass. 17. The majority of other methanogens have C30 hydrocarbons and a mixture of C20 and C40 ethers. 18. Distinctive types of prokaryotes include extremophiles and methanogens ; these are common in some extreme environments. 19. It is anaerobic, syntrophic ( in association with methanogens ) and fatty acid-oxidizing. 20. "' Methanomethylovorans thermophila "'is a species of thermophilic, methylotrophic methanogen .
