Document Detail

Evidence for the direct oxidation of organic nitrogen to N2 gas in the Arabian Sea.
MedLine Citation:
PMID:  22402397     Owner:  NLM     Status:  MEDLINE    
We performed a suite of (15)N incubations ((15)NO(2)(-), (15)NO(3)(-) and (15)NH(4)(+)) with and without the organic-nitrogen (N) compound allylthiourea (ATU), in the suboxic waters of the Arabian Sea. Production of (29)N(2) in control (-ATU) incubations with either (15)NH(4)(+)+(14)NO(2)(-), or their analogues, (15)NO(2)(-)+(14)NH(4)(+), though small, confirmed the presence of anammox. In contrast, when we added ATU, along with (15)NO(2)(-) and (14)NH(4)(+), there was a much greater production of (29)N(2), with 92% of the (15)N-label being recovered as (29)N(2) on average. Such stimulated production of (29)N(2) could not be due to anammox, as the addition of ATU, along with (15)NH(4)(+)+(14)NO(2)(-), only produced (29)N(2) equivalent to that in the controls. The ratios of (29)N(2) to (30)N(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)(-).
Mark Trimmer; Kevin J Purdy
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2012-03-08
Journal Detail:
Title:  The ISME journal     Volume:  6     ISSN:  1751-7370     ISO Abbreviation:  ISME J     Publication Date:  2012 Sep 
Date Detail:
Created Date:  2012-08-21     Completed Date:  2013-04-22     Revised Date:  2013-09-03    
Medline Journal Info:
Nlm Unique ID:  101301086     Medline TA:  ISME J     Country:  England    
Other Details:
Languages:  eng     Pagination:  1798-800     Citation Subset:  IM    
School of Biological and Chemical Sciences, Queen Mary University of London, London, UK.
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MeSH Terms
Bacteria / metabolism
Gases / analysis,  metabolism*
Nitrogen / metabolism*
Nitrogen Isotopes / analysis,  metabolism
Oceans and Seas
Water Microbiology*
Reg. No./Substance:
0/Gases; 0/Nitrogen Isotopes; 7727-37-9/Nitrogen

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