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Article: Degeneration of biogenic superparamagnetic magnetite

TitleDegeneration of biogenic superparamagnetic magnetite
Authors
Issue Date2009
PublisherWiley-Blackwell Publishing Ltd. The Journal's web site is located at http://www.wiley.com/bw/journal.asp?ref=1472-4677
Citation
Geobiology, 2009, v. 7 n. 1, p. 25-34 How to Cite?
AbstractMagnetite crystals precipitated as a consequence of Fe(III) reduction by Shewanella algae BrY after 265 h incubation and 5-year anaerobic storage were investigated with transmission electron microscopy, Mössbauer spectroscopy and X-ray diffraction. The magnetite crystals were typically superparamagnetic with an approximate size of 13 nm. The lattice constants of the 265 h and 5-year crystals are 8.4164Å and 8.3774Å, respectively. The Mössbauer spectra indicated that the 265 h magnetite had excess Fe(II) in its crystal-chemistry (Fe3+ 1.990Fe2+ 1.015O4) but the 5-year magnetite was Fe(II)-deficient in stoichiometry (Fe3+ 2.388Fe2+ 0.419O4). Such crystal-chemical changes may be indicative of the degeneration of superparamagnetic magnetite through the aqueous oxidization of Fe(II) anaerobically, and the concomitant oxidation of the organic phases (fatty acid methyl esters) that were present during the initial formation of the magnetite. The observation of a corona structure on the aged magnetite corroborates the anaerobic oxidation of Fe(II) on the outer layers of magnetite crystals. These results suggest that there may be a possible link between the enzymatic activity of the bacteria and the stability of Fe(II)-excess magnetite, which may help explain why stable nano-magnetite grains are seldom preserved in natural environments. © 2009 The Authors.
Persistent Identifierhttp://hdl.handle.net/10722/58677
ISSN
2015 Impact Factor: 3.5
2015 SCImago Journal Rankings: 1.780
ISI Accession Number ID
Funding AgencyGrant Number
NASA Astrobiology Institute
NASANNG04GG12G
Institute for Rock Magnetism
Keck Foundation
NSF
University of Minnesota
Division of Chemical Sciences, Geosciences and Energy Biosciences of the Office of Basic Energy Sciences, US Department of EnergyDE-AC05-00OR22725
Funding Information:

This research was supported by NASA Astrobiology Institute grant to the Indiana-Princeton-Tennessee Astrobiology Initiative led by L.M. Pratt. Mossbauer spectroscopy at Mount Holyoke College was supported by NASA grant NNG04GG12G. Mossbauer spectroscopy at University of Minnesota was supported by the Institute for Rock Magnetism which is founded by the Keck Foundation, NSF, and the University of Minnesota. DRC was funded by the Division of Chemical Sciences, Geosciences and Energy Biosciences of the Office of Basic Energy Sciences, US Department of Energy under contract DE-AC05-00OR22725 to Oak Ridge National Laboratory, managed and operated by UT-Battelle, LLC. The manuscript was improved by the insightful comments from Dr Robert Kopp and an anonymous reviewer, and subject editor Lee Kump.

References

 

DC FieldValueLanguage
dc.contributor.authorLi, YLen_HK
dc.contributor.authorPfiffner, SMen_HK
dc.contributor.authorDyar, MDen_HK
dc.contributor.authorVali, Hen_HK
dc.contributor.authorKonhauser, Ken_HK
dc.contributor.authorCole, DRen_HK
dc.contributor.authorRondinone, AJen_HK
dc.contributor.authorPhelps, TJen_HK
dc.date.accessioned2010-05-31T03:34:52Z-
dc.date.available2010-05-31T03:34:52Z-
dc.date.issued2009en_HK
dc.identifier.citationGeobiology, 2009, v. 7 n. 1, p. 25-34en_HK
dc.identifier.issn1472-4677en_HK
dc.identifier.urihttp://hdl.handle.net/10722/58677-
dc.description.abstractMagnetite crystals precipitated as a consequence of Fe(III) reduction by Shewanella algae BrY after 265 h incubation and 5-year anaerobic storage were investigated with transmission electron microscopy, Mössbauer spectroscopy and X-ray diffraction. The magnetite crystals were typically superparamagnetic with an approximate size of 13 nm. The lattice constants of the 265 h and 5-year crystals are 8.4164Å and 8.3774Å, respectively. The Mössbauer spectra indicated that the 265 h magnetite had excess Fe(II) in its crystal-chemistry (Fe3+ 1.990Fe2+ 1.015O4) but the 5-year magnetite was Fe(II)-deficient in stoichiometry (Fe3+ 2.388Fe2+ 0.419O4). Such crystal-chemical changes may be indicative of the degeneration of superparamagnetic magnetite through the aqueous oxidization of Fe(II) anaerobically, and the concomitant oxidation of the organic phases (fatty acid methyl esters) that were present during the initial formation of the magnetite. The observation of a corona structure on the aged magnetite corroborates the anaerobic oxidation of Fe(II) on the outer layers of magnetite crystals. These results suggest that there may be a possible link between the enzymatic activity of the bacteria and the stability of Fe(II)-excess magnetite, which may help explain why stable nano-magnetite grains are seldom preserved in natural environments. © 2009 The Authors.en_HK
dc.languageengen_HK
dc.publisherWiley-Blackwell Publishing Ltd. The Journal's web site is located at http://www.wiley.com/bw/journal.asp?ref=1472-4677en_HK
dc.relation.ispartofGeobiologyen_HK
dc.subject.meshFerric Compounds - chemistry - metabolism-
dc.subject.meshFerrosoferric Oxide - chemistry - metabolism-
dc.subject.meshMicroscopy, Electron, Transmission-
dc.subject.meshOxidation-Reduction-
dc.subject.meshShewanella - metabolism-
dc.titleDegeneration of biogenic superparamagnetic magnetiteen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1472-4677&volume=7&issue=1&spage=25&epage=34&date=2009&atitle=Degeneration+of+biogenic+superparamagnetic+magnetiteen_HK
dc.identifier.emailLi, YL:yiliang@hkucc.hku.hken_HK
dc.identifier.authorityLi, YL=rp01354en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1111/j.1472-4669.2008.00186.xen_HK
dc.identifier.pmid19200144-
dc.identifier.scopuseid_2-s2.0-60049099865en_HK
dc.identifier.hkuros167846en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-60049099865&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume7en_HK
dc.identifier.issue1en_HK
dc.identifier.spage25en_HK
dc.identifier.epage34en_HK
dc.identifier.eissn1472-4669-
dc.identifier.isiWOS:000263133700004-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridLi, YL=27171876700en_HK
dc.identifier.scopusauthoridPfiffner, SM=6603022541en_HK
dc.identifier.scopusauthoridDyar, MD=7004121688en_HK
dc.identifier.scopusauthoridVali, H=7004175757en_HK
dc.identifier.scopusauthoridKonhauser, K=6701782021en_HK
dc.identifier.scopusauthoridCole, DR=7402514711en_HK
dc.identifier.scopusauthoridRondinone, AJ=6603096980en_HK
dc.identifier.scopusauthoridPhelps, TJ=35509444300en_HK
dc.identifier.citeulike4022464-

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