Linked Life Data

19192786

Source:http://linkedlifedata.com/resource/pubmed/id/19192786

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
23
pubmed:dateCreated
2009-2-5
pubmed:abstractText
Manganese oxides are widespread in the environment and their surface reactivity has the potential to modifythe geochemical behavior of uranium. We have investigated the effect of different concentrations of U and Mn on the coupled biogeochemical oxidation-reduction reactions of U and Mn. Experiments conducted in the presence of Mn(II)-oxidizing spores from Bacillus sp. strain SG-1 and 5% headspace oxygen show that the Mn oxides produced by these spores can rapidly oxidize UO2. Thirty to fifty times more UO2 is oxidized in the presence of Mn oxides compared to Mn oxide free controls. As a consequence of this U02 oxidation, Mn oxides are reduced to soluble Mn(II) that can be reoxidized by SG-1 spores. SG-1 spores cannot directly oxidize U02, but U02 oxidation proceeds rapidly with Mn(II) concentrations of <5 microM. The rate of UO2 oxidation is equal to the rate of MnO2 reduction with UO2 oxidation controlled by the initial concentrations of UO2, dissolved Mn(II) (in systems with spores), or Mn(IV) oxides (in systems containing preformed MnO2). U(VI) and UO2 decrease the Mn(II) oxidation rate in different ways by inhibiting the Mn(II)-oxidizing enzyme or decreasing the available Mn(II). These results emphasize the need to consider the impact of Mn(II)-oxidizing bacteria when predicting the potential for U02 oxidation in the subsurface.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Dec
pubmed:issn
0013-936X
pubmed:author
pubmed:issnType
Print
pubmed:day
1
pubmed:volume
42
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
8709-14
pubmed:meshHeading
pubmed:year
2008
pubmed:articleTitle
Indirect UO2 oxidation by Mn(II)-oxidizing spores of Bacillus sp. strain SG-1 and the effect of U and Mn concentrations.
pubmed:affiliation
Division of Environmental and Biomolecular Systems, Oregon Health & Science University, 20000 NW Walker Road, Beaverton, Oregon 97006, USA. chinnis@ebs.ogi.edu
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, Non-P.H.S.