the se data imply that nitrify in gan d denitrify in g microbes had already evolved by the late archean and were present be fore oxygen first beg an to accumulate in the atmosphere.
这些发现提示,至少有一个主要的氮素加工细菌组在地球的大气变得富含氧气之前就已经演化形成了。
strain sdn could denitrify nitrate companying with the formation of nitrite in aerobic environment. it could use acetamide as the sole carbon and nitrogen sources.