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Heterotrophic nitrification among denitrifiers.

D Castignetti, T C Hollocher

    Applied and Environmental Microbiology
    |April 1, 1984
    PubMed
    Summary

    Six denitrifying bacteria can convert pyruvic oxime to nitrite, with some also oxidizing hydroxylamine. These soil bacteria possess both nitrification and denitrification capabilities, offering potential advantages.

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    Area of Science:

    • Microbiology
    • Environmental Science

    Background:

    • Denitrifying bacteria play a crucial role in nitrogen cycling.
    • Understanding their metabolic capabilities, including nitrification, is vital for soil health.

    Purpose of the Study:

    • To investigate the heterotrophic nitrification of pyruvic oxime by denitrifying bacteria.
    • To identify bacterial species capable of nitrifying pyruvic oxime and oxidizing hydroxylamine.

    Main Methods:

    • Testing twelve denitrifying bacteria from six genera for pyruvic oxime nitrification.
    • Assessing bacterial growth on pyruvic oxime and yeast extract.
    • Evaluating hydroxylamine oxidation in resting bacterial states.

    Main Results:

    • Six of twelve bacteria showed nitrification activity, producing nitrite from pyruvic oxime.
    • Pseudomonas and Alcaligenes species were identified as active nitrifiers.
    • Eight bacteria could oxidize hydroxylamine to nitrite, with Pseudomonas aureofaciens showing high activity.

    Conclusions:

    • Certain soil denitrifying bacteria possess significant pyruvic oxime nitrification and hydroxylamine oxidation abilities.
    • The co-occurrence of nitrification and denitrification in some bacteria may confer ecological advantages.
    • Findings contribute to understanding microbial roles in nitrogen transformation processes.

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