Linked Life Data

10698770

Source:http://linkedlifedata.com/resource/pubmed/id/10698770

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
2000-4-24
pubmed:abstractText
It has recently been noted that a diversity of hyperthermophilic microorganisms have the ability to reduce Fe(III) with hydrogen as the electron donor, but the reduction of Fe(III) or other metals by these organisms has not been previously examined in detail. When Pyrobaculum islandicum was grown at 100 degrees C in a medium with hydrogen as the electron donor and Fe(III)-citrate as the electron acceptor, the increase in cell numbers of P. islandicum per mole of Fe(III) reduced was found to be ca. 10-fold higher than previously reported. Poorly crystalline Fe(III) oxide could also serve as the electron acceptor for growth on hydrogen. The stoichiometry of hydrogen uptake and Fe(III) oxide reduction was consistent with the oxidation of 1 mol of hydrogen resulting in the reduction of 2 mol of Fe(III). The poorly crystalline Fe(III) oxide was reduced to extracellular magnetite. P. islandicum could not effectively reduce the crystalline Fe(III) oxide minerals goethite and hematite. In addition to using hydrogen as an electron donor for Fe(III) reduction, P. islandicum grew via Fe(III) reduction in media in which peptone and yeast extract served as potential electron donors. The closely related species P. aerophilum grew via Fe(III) reduction in a similar complex medium. Cell suspensions of P. islandicum reduced the following metals with hydrogen as the electron donor: U(VI), Tc(VII), Cr(VI), Co(III), and Mn(IV). The reduction of these metals was dependent upon the presence of cells and hydrogen. The metalloids arsenate and selenate were not reduced. U(VI) was reduced to the insoluble U(IV) mineral uraninite, which was extracellular. Tc(VII) was reduced to insoluble Tc(IV) or Tc(V). Cr(VI) was reduced to the less toxic, less soluble Cr(III). Co(III) was reduced to Co(II). Mn(IV) was reduced to Mn(II) with the formation of manganese carbonate. These results demonstrate that biological reduction may contribute to the speciation of metals in hydrothermal environments and could account for such phenomena as magnetite accumulation and the formation of uranium deposits at ca. 100 degrees C. Reduction of toxic metals with hyperthermophilic microorganisms or their enzymes might be applied to the remediation of metal-contaminated waters or waste streams.
pubmed:commentsCorrections
http://linkedlifedata.com/resource/pubmed/commentcorrection/10698770-10049886, http://linkedlifedata.com/resource/pubmed/commentcorrection/10698770-10425777, http://linkedlifedata.com/resource/pubmed/commentcorrection/10698770-11539662, http://linkedlifedata.com/resource/pubmed/commentcorrection/10698770-11539735, http://linkedlifedata.com/resource/pubmed/commentcorrection/10698770-11540245, http://linkedlifedata.com/resource/pubmed/commentcorrection/10698770-1575486, http://linkedlifedata.com/resource/pubmed/commentcorrection/10698770-1631089, http://linkedlifedata.com/resource/pubmed/commentcorrection/10698770-1886521, http://linkedlifedata.com/resource/pubmed/commentcorrection/10698770-3843705, http://linkedlifedata.com/resource/pubmed/commentcorrection/10698770-390357, http://linkedlifedata.com/resource/pubmed/commentcorrection/10698770-4598231, http://linkedlifedata.com/resource/pubmed/commentcorrection/10698770-6433795, http://linkedlifedata.com/resource/pubmed/commentcorrection/10698770-7393566, http://linkedlifedata.com/resource/pubmed/commentcorrection/10698770-7527204, http://linkedlifedata.com/resource/pubmed/commentcorrection/10698770-7766214, http://linkedlifedata.com/resource/pubmed/commentcorrection/10698770-8257100, http://linkedlifedata.com/resource/pubmed/commentcorrection/10698770-8633852, http://linkedlifedata.com/resource/pubmed/commentcorrection/10698770-8688069, http://linkedlifedata.com/resource/pubmed/commentcorrection/10698770-8863450, http://linkedlifedata.com/resource/pubmed/commentcorrection/10698770-9103640, http://linkedlifedata.com/resource/pubmed/commentcorrection/10698770-9103646, http://linkedlifedata.com/resource/pubmed/commentcorrection/10698770-9206008, http://linkedlifedata.com/resource/pubmed/commentcorrection/10698770-9738498
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Mar
pubmed:issn
0099-2240
pubmed:author
pubmed:issnType
Print
pubmed:volume
66
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1050-6
pubmed:dateRevised
2009-11-18
pubmed:meshHeading
pubmed:year
2000
pubmed:articleTitle
Reduction of Fe(III), Mn(IV), and toxic metals at 100 degrees C by Pyrobaculum islandicum.
pubmed:affiliation
Department of Microbiology, University of Massachusetts, Amherst, Massachusetts 01003, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, Non-P.H.S.