Linked Life Data

16349295

Source:http://linkedlifedata.com/resource/pubmed/id/16349295

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
6
pubmed:dateCreated
2010-6-25
pubmed:abstractText
The coupling between nitrification and denitrification and the regulation of these processes by oxygen were studied in freshwater sediment microcosms with O(2) and NO(3) microsensors. Depth profiles of nitrification (indicated as NO(3) production), denitrification (indicated as NO(3) consumption), and O(2) consumption activities within the sediment were calculated from the measured concentration profiles. From the concentration profiles, it was furthermore possible to distinguish between the rate of denitrification based on the diffusional supply of NO(3) from the overlying water and the rate based on NO(3) supplied by benthic nitrification (D(w) and D(n), respectively). An increase in O(2) concentration caused a deeper O(2) penetration while a decrease in D(w) and an increase in D(n) were observed. The relative importance for total denitrification of NO(3) produced by nitrification thus increased compared with NO(3) supplied from the water phase. The decrease in D(w) at high oxygen was due to an increase in diffusion path for NO(3) from the overlying water to the denitrifying layers in the anoxic sediment. At high O(2) concentrations, nitrifying activity was restricted to the lower part of the oxic zone where there was a continuous diffusional supply of NH(4) from deeper mineralization processes, and the long diffusion path from the nitrification zone to the overlying water compared with the path to the denitrifying layers led to a stimulation in D(n).
pubmed:commentsCorrections
pubmed:language
eng
pubmed:journal
pubmed:status
PubMed-not-MEDLINE
pubmed:month
Jun
pubmed:issn
0099-2240
pubmed:author
pubmed:issnType
Print
pubmed:volume
60
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
2094-100
pubmed:dateRevised
2010-9-20
pubmed:year
1994
pubmed:articleTitle
Estimation of nitrification and denitrification from microprofiles of oxygen and nitrate in model sediment systems.
pubmed:affiliation
Department of Microbial Ecology, Institute of Biological Sciences, University of Aarhus, Ny Munkegade, DK-8000 Aarhus C, Denmark.
pubmed:publicationType
Journal Article