Summary
A bacterium, isolated from a Danish watercourse, was studied with special regard to nitrogen fixing ability, and it was found that this strain was able to fix elemental nitrogen in amounts up to 1.6 mg. per g. of carbohydrate decomposed. This nitrogen-fixing ability was confirmed definitively by an isotope experiment. Free oxygen was found to have a clearly depressing effect on nitrogen fixation.
The systematic position of this bacterium is difficult to establish with certainty, but in all probability it belongs to the genusAchromobacter Bergey et al., although not identical with any of the species described inBergeys Manual (1948).
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Jensen, V. A new nitrogen fixing bacterium from a Danish watercourse. Archiv. Mikrobiol. 29, 348–353 (1958). https://doi.org/10.1007/BF00571593
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DOI: https://doi.org/10.1007/BF00571593