| Nitrous oxide formation in the Colne estuary, England: the central role of nitrite. | |
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MedLine Citation:
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PMID: 11872474 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Nitrate and nitrite concentrations in the water and nitrous oxide and nitrite fluxes across the sediment-water interface were measured monthly in the River Colne estuary, England, from December 1996 to March 1998. Water column concentrations of N(2)O in the Colne were supersaturated with respect to air, indicating that the estuary was a source of N(2)O for the atmosphere. At the freshwater end of the estuary, nitrous oxide effluxes from the sediment were closely correlated with the nitrite concentrations in the overlying water and with the nitrite influx into the sediment. Increases in N(2)O production from sediments were about 10 times greater with the addition of nitrite than with the addition of nitrate. Rates of denitrification were stimulated to a larger extent by enhanced nitrite than by nitrate concentrations. At 550 microM nitrite or nitrate (the highest concentration used), the rates of denitrification were 600 micromol N.m(-2).h(-1) with nitrite but only 180 micromol N.m(-2).h(-1) with nitrate. The ratios of rates of nitrous oxide production and denitrification (N(2)O/N(2) x 100) were significantly higher with the addition of nitrite (7 to 13% of denitrification) than with nitrate (2 to 4% of denitrification). The results suggested that in addition to anaerobic bacteria, which possess the complete denitrification pathway for N(2) formation in the estuarine sediments, there may be two other groups of bacteria: nitrite denitrifiers, which reduce nitrite to N(2) via N(2)O, and obligate nitrite-denitrifying bacteria, which reduce nitrite to N(2)O as the end product. Consideration of free-energy changes during N(2)O formation led to the conclusion that N(2)O formation using nitrite as the electron acceptor is favored in the Colne estuary and may be a critical factor regulating the formation of N(2)O in high-nutrient-load estuaries. |
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Authors:
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Liang F Dong; David B Nedwell; Graham J C Underwood; Daniel C O Thornton; Iman Rusmana |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Applied and environmental microbiology Volume: 68 ISSN: 0099-2240 ISO Abbreviation: Appl. Environ. Microbiol. Publication Date: 2002 Mar |
Date Detail:
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Created Date: 2002-03-01 Completed Date: 2002-05-23 Revised Date: 2010-09-14 |
Medline Journal Info:
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Nlm Unique ID: 7605801 Medline TA: Appl Environ Microbiol Country: United States |
Other Details:
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Languages: eng Pagination: 1240-9 Citation Subset: IM |
Affiliation:
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Department of Biological Sciences, John Tabor Laboratories, University of Essex, Wivenhoe Park, Colchester CO4 3SQ, United Kingdom. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Bacteria, Anaerobic
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metabolism England Fresh Water / chemistry*, microbiology* Nitrates / metabolism Nitrites / metabolism* Nitrogen / metabolism Nitrous Oxide / metabolism* |
| Chemical | |
Reg. No./Substance:
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0/Nitrates; 0/Nitrites; 10024-97-2/Nitrous Oxide; 7727-37-9/Nitrogen |
| Comments/Corrections | |
Comment In:
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Appl Environ Microbiol. 2002 Oct;68(10):5202; author reply 5202-4
[PMID:
12324378
]
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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