31. "Methanocaldococcus jannaschii " is a thermophilic methanogen , meaning it grows by making methane as a metabolic byproduct. 32. Research at the University of Arkansas presented in June 2015 suggested that some methanogens could survive on Mars's low pressure. 33. Methanogens lack peptidoglycan, a polymer that is found in the cell walls of the Bacteria but not in those of Archaea.34. Some scientists have proposed that the presence of methane in the Martian atmosphere may be indicative of native methanogens on that planet. 35. Research at the University of Arkansas presented in June 2015 suggested that some methanogens could survive in Mars's low pressure. 36. Here, methanogens use the intermediate products of the preceding stages and convert them into methane, carbon dioxide, and water. 37. "' Methanomethylovorans hollandica "'is a species of methylotrophic methanogen able to grow on dimethyl sulfide and methanethiol. 38. This type of wall is found in some methanogens , such as " Methanobacterium " and " Methanothermus ". 39. Methane is produced by the archea, methanogens , described above within the rumen, and this methane is released to the atmosphere. 40. The results reported indicate that the perchlorates discovered by the Phoenix Lander would not rule out the possible presence of methanogens on Mars.
