Heterotrophic nitrification among denitrifiers.
AUTOR(ES)
Castignetti, D
RESUMO
Twelve denitrifying bacteria representing six genera were tested for an ability to nitrify pyruvic oxime heterotrophically. Six of these bacteria exhibited appreciable nitrification activity, yielding as much as 5.8 mM nitrite and little or no nitrate when grown in a mineral salts medium containing 7 mM pyruvic oxime and 0.05% yeast extract. Of the six active bacteria, four (Pseudomonas denitrificans, Pseudomonas aeruginosa, and two strains of Pseudomonas fluorescens) could grow on yeast extract but not pyruvic oxime, one (Pseudomonas aureofaciens) could grow slowly on pyruvic oxime, and one (Alcaligenes faecalis) could apparently grow on pyruvic oxime in the presence of yeast extract but not in its absence. Eight of the twelve bacteria in the resting state could oxidize hydroxylamine to nitrite, and P. aureofaciens was remarkably active in this regard. In general, those denitrifiers active in the nitrification of pyruvic oxime or hydroxylamine or both are abundant in soils. A possible advantage of having nitrification and denitrification capabilities in the same organism is discussed.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=239737Documentos Relacionados
- Nitric oxide-dependent proton translocation in various denitrifiers.
- Heterotrophic Nitrification by Arthrobacter sp
- NITRIFICATION BY CERTAIN HETEROTROPHIC BACTERIA PRESENT IN SOIL
- Identification of Heterotrophic Nitrification in a Sierran Forest Soil
- Nitrification in histosols: a potential role for the heterotrophic nitrifier.
