Linked Life Data

16346006

Source:http://linkedlifedata.com/resource/pubmed/id/16346006

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
5
pubmed:dateCreated
2010-6-25
pubmed:abstractText
Nitrogen fixation (C(2)H(2) reduction) in a sediment-water system was studied under anaerobic incubation conditions. Sodium sulfide at low concentrations stimulated activity, with a twofold increase in C(2)H(4) production occurring in the presence of 8 mumol of S per ml of stream water. Sodium sulfide at concentrations of 16 mumol of S per ml or greater inhibited nitrogen fixation, with 64 mumol of S per ml being completely inhibitory. Sulfide at levels of 16 mumol/ml or above inhibited CO(2) production, and the degree of inhibition increased with increasing concentration of sulfide. Titanium (III) citrate (used to modify Eh levels) stimulated both nitrogen fixation and CO(2) production, but could not duplicate, at any concentration tested, the twofold increase in nitrogen fixation caused by 8 mumol of S per ml. Sulfide additions caused pH changes in the sediment, and when the sediment was adjusted and maintained at pH 7.0 all concentrations of sulfide inhibited nitrogen fixation activity. From considerations of the redox equilibria of H(2), H(2)S, and other sulfur species at various pH values, it appeared that H(2)S was the toxic entity and that HS was less toxic. The observed stimulation of activity was apparently due to a pH change coupled with the concurrent production of HS from H(2)S.
pubmed:commentsCorrections
pubmed:language
eng
pubmed:journal
pubmed:status
PubMed-not-MEDLINE
pubmed:month
May
pubmed:issn
0099-2240
pubmed:author
pubmed:issnType
Print
pubmed:volume
43
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1076-9
pubmed:dateRevised
2010-9-20
pubmed:year
1982
pubmed:articleTitle
Effect of sulfide on nitrogen fixation in a stream sediment-water system.
pubmed:affiliation
Department of Biology, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1.
pubmed:publicationType
Journal Article