Trimmer, Mark and Purdy, Kevin J.. (2012) Evidence for the direct oxidation of organic nitrogen to N2 gas in the Arabian Sea. ISME Journal, Vol.6 (No.9). pp. 1798-1800. ISSN 1751-7362

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Abstract

We performed a suite of 15N incubations ( 15NO 2 -, 15NO 3 - and 15NH 4 +) with and without the organic-nitrogen (N) compound allylthiourea (ATU), in the suboxic waters of the Arabian Sea. Production of 29N 2 in control (-ATU) incubations with either 15NH 4 ++ 14NO 2 -, or their analogues, 15NO 2 -+ 14NH 4 +, though small, confirmed the presence of anammox. In contrast, when we added ATU, along with 15NO 2 - and 14NH 4 +, there was a much greater production of 29N 2, with 92% of the 15N-label being recovered as 29N 2 on average. Such stimulated production of 29N 2 could not be due to anammox, as the addition of ATU, along with 15NH 4 ++ 14NO 2 -, only produced 29N 2 equivalent to that in the controls. The ratios of 29N 2 to 30N 2 produced also precluded stimulation of denitrification. We present this as evidence for a hitherto uncharacterised metabolism potentially capable of oxidising organic-N (e.g. NH 2 groups) directly to N 2 gas at the expense of NO 2 -.

Item Type:	Journal Article
Subjects:	Q Science > Q Science (General)
Divisions:	Faculty of Science > Life Sciences (2010- )
Journal or Publication Title:	ISME Journal
Publisher:	Nature Publishing Group
ISSN:	1751-7362
Date:	September 2012
Volume:	Vol.6
Number:	No.9
Page Range:	pp. 1798-1800
Identification Number:	10.1038/ismej.2012.18
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Description:	Short Communication
URI:	http://wrap.warwick.ac.uk/id/eprint/44890

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