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Abstract

 

This article in SSSAJ

  1. Vol. 30 No. 3, p. 351-355
     
    Received: Nov 26, 1965
    Published: May, 1966


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doi:10.2136/sssaj1966.03615995003000030016x

Nitrification by Heterotrophic Soil Microorganisms1

  1. K. G. Doxtader and
  2. M. Alexander2

Abstract

Abstract

Heterotrophic soil bacteria, actinomycetes, and fungi produced nitrite when grown in media containing various reduced forms of nitrogen. Amines, amides, N-alkylhydroxylamines, oximes, hydroxamic acids, and aromatic nitro compounds served as substrates for nitrite formation by individual microorganisms. The yield of nitrite varied with the organism and the substrate, ranging from 190 ppm of nitrite-nitrogen with acetaldoxime as a nitrogen source to a few ppm with certain substituted ureas. None of the microorganisms formed nitrate from the substrates tested. One isolate, identified as a species of Fusarium, converted more than 90% of the nitrogen of pyruvic oxime to nitrite. Cell extracts of the fungus catalyzed the production of nitrite from the oxime.

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