Publication Date:
2011-07-30
Description:
The ocean is an important global source of nitrous oxide (N(2)O), a greenhouse gas that contributes to stratospheric ozone destruction. Bacterial nitrification and denitrification are thought to be the primary sources of marine N(2)O, but the isotopic signatures of N(2)O produced by these processes are not consistent with the marine contribution to the global N(2)O budget. Based on enrichment cultures, we report that archaeal ammonia oxidation also produces N(2)O. Natural-abundance stable isotope measurements indicate that the produced N(2)O had bulk delta(15)N and delta(18)O values higher than observed for ammonia-oxidizing bacteria but similar to the delta(15)N and delta(18)O values attributed to the oceanic N(2)O source to the atmosphere. Our results suggest that ammonia-oxidizing archaea may be largely responsible for the oceanic N(2)O source.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Santoro, Alyson E -- Buchwald, Carolyn -- McIlvin, Matthew R -- Casciotti, Karen L -- New York, N.Y. -- Science. 2011 Sep 2;333(6047):1282-5. doi: 10.1126/science.1208239. Epub 2011 Jul 28.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA. asantoro@umces.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21798895" target="_blank"〉PubMed〈/a〉
Keywords:
Ammonia/*metabolism
;
Archaea/enzymology/*metabolism
;
Bacteria/metabolism
;
Culture Media
;
Denitrification
;
Linear Models
;
Molecular Sequence Data
;
Nitrification
;
Nitrogen Isotopes
;
Nitrous Oxide/*metabolism
;
Oxidation-Reduction
;
Oxygen Isotopes
;
Pacific Ocean
;
Seawater/*microbiology
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
Permalink
