Aerobic denitrification in various heterotrophic nitrifiers

Various heterotrophic nitrifiers have been tested and found to also be aerobic denitrifiers. The simultaneous use of two electron acceptors (oxygen and nitrate) permits these organisms to grow more rapidly than on either single electron acceptor, but generally results in a lower yield than is obtain...

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Bibliographic Details
Published inAntonie van Leeuwenhoek Vol. 56; no. 4; p. 289
Main Authors Robertson, L A, Cornelisse, R, De Vos, P, Hadioetomo, R, Kuenen, J G
Format Journal Article
LanguageEnglish
Published Netherlands 01.11.1989
Subjects
Aerobiosis
Metabolism
Nitrates - pharmacokinetics
Nitrogen - metabolism
Oxygen - pharmacokinetics
Pseudomonas - classification
Pseudomonas - growth & development
Pseudomonas - metabolism
Thiobacillus - growth & development
Thiobacillus - metabolism
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Summary:Various heterotrophic nitrifiers have been tested and found to also be aerobic denitrifiers. The simultaneous use of two electron acceptors (oxygen and nitrate) permits these organisms to grow more rapidly than on either single electron acceptor, but generally results in a lower yield than is obtained on oxygen, alone. One strain, formerly known as "Pseudomonas denitrificans", was grown in the chemostat and shown to achieve nitrification rates of up to 44 nmol NH3 min-1 mg protein-1 and denitrification rates up to 69 nmol NO3(-1) min-1 mg protein-1. Unlike Thiosphaera pantotropha, this strain needed to induce its nitrate reductase. However, the remainder of the denitrifying pathway was constitutive and, like T. pantotropha, "Ps. denitrificans" probably possesses the copper nitrite reductase.
ISSN:0003-6072
DOI:10.1007/bf00443743