Abstract
Summary
Aerobacter aerogenes strain M5al fixing molecular nitrogen require at least 10 times more iron than do cultures using ammonium-N. Also, the organism is about 100 times more sensitive to carbon monoxide when using free than when assimilating combined nitrogen. Although there is an absolute requirement for molybdenum for nitrogen fixation by this organism, it is considerably less than that noted for many strains of the azotobacter. No specific requirement for calcium could be demonstrated.
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