AcetyleneDuty to WarnNitrogenaseEthaneNitrogen FixationAlkynesTungstenAzotobacterDuty to RecontactNitrosomonasHydrocarbons, AcyclicEthylenesMolybdoferredoxinNitrous OxideHydrogenDeltaproteobacteriaOxidation-ReductionAzotobacter vinelandiiMethaneMolybdenumSpirillumPropaneAmmoniaNursing, Private DutyNitrogen