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Applied and Environmental Microbiology, November 2002, p. 5351-5357, Vol. 68, No. 11
0099-2240/02/$04.00+0     DOI: 10.1128/AEM.68.11.5351-5357.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Anaerobic Ammonia Oxidation in the Presence of Nitrogen Oxides (NOx) by Two Different Lithotrophs

Ingo Schmidt,1* Cristian Hermelink,1 Katinka van de Pas-Schoonen,1 Marc Strous,1 Huub J. op den Camp,1 J. Gijs Kuenen,2 and Mike S. M. Jetten1

Department of Microbiology, University of Nijmegen, 6525 ED Nijmegen,1 Kluyver Laboratory for Biotechnology, Department of Microbiology and Enzymology, Delft University of Technology, 2628 BC Delft, The Netherlands2

Received 3 June 2002/ Accepted 5 August 2002

The anaerobic ammonia-oxidizing activity of the planctomycete Candidatus "Brocadia anammoxidans" was not inhibited by NO concentrations up to 600 ppm and NO2 concentrations up to 100 ppm. B. anammoxidans was able to convert (detoxify) NO, which might explain the high NO tolerance of this organism. In the presence of NO2, the specific ammonia oxidation activity of B. anammoxidans increased, and Nitrosomonas-like microorganisms recovered an NO2-dependent anaerobic ammonia oxidation activity. Addition of NO2 to a mixed population of B. anammoxidans and Nitrosomonas induced simultaneous specific anaerobic ammonia oxidation activities of up to 5.5 mmol of NH4+ g of protein-1 h-1 by B. anammoxidans and up to 1.5 mmol of NH4+ g of protein-1 h-1 by Nitrosomonas. The stoichiometry of the converted N compounds (NO2-/NH3 ratio) and the microbial community structure were strongly influenced by NO2. The combined activity of B. anammoxidans and Nitrosomonas-like ammonia oxidizers might be of relevance in natural environments and for technical applications.

* Corresponding author. Mailing address: Department of Microbiology, University of Nijmegen, Toernooiveld 1, 6525 ED Nijmegen, The Netherlands. Phone: 31-24-3652568. Fax: 31-24-3652830. E-mail: i.schmidt{at}sci.kun.nl.

Applied and Environmental Microbiology, November 2002, p. 5351-5357, Vol. 68, No. 11
0099-2240/02/$04.00+0     DOI: 10.1128/AEM.68.11.5351-5357.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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