Trace Metal Requirements of Aerobacter aerogenes for Assimilation of Molecular Nitrogen.

Abstract
A. aerogenes strain M5al which fixes molecular N requires at least 10 times more Fe than do cultures using ammonium-N. The organism is about 100 times more sensitive to CO when using free N than when assimilating combined N. Although there is an absolute requirement for Mo for N-fixation by this organism, it is considerably less than that noted for many strains of the azotobacter. No specific requirement for Ca could be demonstrated.

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