Effects of oxygen, pH and nitrate concentration on denitrification by Pseudomonas species.

Thomas, K L, Lloyd, D ORCID: https://orcid.org/0000-0002-5656-0571 and Boddy, L 1994. Effects of oxygen, pH and nitrate concentration on denitrification by Pseudomonas species. FEMS Microbiology Letters 118 (1-2) , 181--186. 10.1111/j.1574-6968.1994.tb06823.x

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Abstract

The production of nitrogen-containing gases by denitrification in three organisms was examined using membrane inlet mass spectrometry. The effects of O2 (during both growth and maintenance) and of pH, nitrate concentration and carbon source were tested in non-proliferating cell suspensions. Two strains of Pseudomonas aeruginosa were capable of co-respiration of NO3- and O2 and, under controlled O2 supply, gave oscillatory denitrification. Variations in culture and assay conditions affected both the rate of denitrification and the ratio of end products (N2O:N2). Higher rates were seen following anaerobic growth. Optimum values of pH and nitrate concentration for denitrification are given. Generally, the optimum pH was 7.0-7.5, approximately that of the growth medium. Optimum nitrate concentration was generally 20 mM.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Biosciences
Publisher:	Oxford University Press (OUP): Policy B - Oxford Open Option D
ISSN:	0378-1097
Date of Acceptance:	23 February 1994
Last Modified:	26 Oct 2022 08:40
URI:	https://orca.cardiff.ac.uk/id/eprint/128035

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