酸中毒（Aciticlasitic）
| 底物利用类型和反应 Substrate utilization and reactions | 标准吉布斯自由能 △_G_0 (kj/mol CH4) | 产甲烷古菌 Methanogens | | --------------------------------------------- | --------------------------- | ------------------------------------------------- | | →CH_4+CO_2$ | −33 | Methanosarcinales：_Methanosarcina_、_Methanothrix_ | | +2H_2O→5CH_4+7CO_2$ | −96 | Methanosarcinales：_Methanosarcina_ |