Summary: A number of representative species of obligate methane-oxidizing bacteria were surveyed for their ability to fix N by growth experiments and the acetylene reduction test. Although all strains exhibited growth on nitrogen-free plates, only type II organisms and the type X methanotroph (Bath) grew well in nitrogen-free liquid medium and were capable of active acetylene reduction. N-fixation in type II methanotrophs was less senstive to O than in the type X methanotroph (Bath) and batch cultures of type II organisms could be established at pO values of up to 0.2 bar. N-fixation in (Bath) was inhibited at pO values above 0.15 bar and the “switch-off” of nitrogenase activity by ammonia was also observed in this organism.


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