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dc.contributor.authorGonzalez-Gil, G.
dc.contributor.authorAmonette, James E.
dc.contributor.authorRomine, Margaret F.
dc.contributor.authorGorby, Yuri A.
dc.contributor.authorGeesey, Gill G.
dc.date.accessioned2017-07-20T15:22:05Z
dc.date.available2017-07-20T15:22:05Z
dc.date.issued2005-03
dc.identifier.citationGonzalez-Gil G, Amonette JE, Romine MF, Gorby YA, Geesey GG, "Bioreduction of natural specular hematite under flow conditions," Geochim Cosmochim Acta, 2005 69(5):1145-1155en_US
dc.identifier.issn0016-7037
dc.identifier.urihttps://scholarworks.montana.edu/xmlui/handle/1/13362
dc.description.abstractDissimilatory reduction of Fe(III) by Shewanella oneidensis MR-1 was evaluated using natural specular hematite as sole electron acceptor in an open system under dynamic flow conditions to obtain a better understanding of biologic Fe(III) reduction in the natural environment. During initial exposure to hematite under advective flow conditions, cells exhibited a transient association with the mineral characterized by a rapid rate of attachment followed by a comparable rate of detachment before entering a phase of surface colonization that was slower but steadier than that observed initially. Accumulation of cells on the hematite surface was accompanied by the release of soluble Fe(II) into the aqueous phase when no precautions were taken to remove amorphous Fe(III) from the mineral surface before colonization. During the period of surface colonization following the detachment phase, cell yield was estimated at 1.5–4 107 cells/µmol Fe(II) produced, which is similar to that reported in studies conducted in closed systems. This yield does not take into account those cells that detached during this phase or the Fe(II) that remained associated with the hematite surface. Hematite reduction by the bacterium led to localized surface pitting and localized discrete areas where Fe (II) precipitation occurred. The cleavage plane of hematite left behind after bacterial reduction, as revealed by our results, strongly suggests, that heterogeneous energetics of the mineral surface play a strong role in this bioprocess. AQDS, an electron shuttle shown to stimulate bioreduction of Fe(III) in other studies, inhibited reduction of hematite by this bacterium under the dynamic flow conditions employed in the current study.en_US
dc.titleBioreduction of natural specular hematite under flow conditionsen_US
dc.typeArticleen_US
mus.citation.extentfirstpage1145en_US
mus.citation.extentlastpage1155en_US
mus.citation.issue5en_US
mus.citation.journaltitleGeochimica et Cosmochimica Actaen_US
mus.citation.volume69en_US
mus.identifier.categoryEngineering & Computer Scienceen_US
mus.identifier.doi10.1016/j.gca.2004.08.014en_US
mus.relation.collegeCollege of Engineeringen_US
mus.relation.departmentCenter for Biofilm Engineering.en_US
mus.relation.departmentChemical & Biological Engineering.en_US
mus.relation.departmentChemical Engineering.en_US
mus.relation.universityMontana State University - Bozemanen_US
mus.relation.researchgroupCenter for Biofilm Engineering.en_US
mus.data.thumbpage2en_US


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