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Article: Hexagonal platelet-like magnetite as a biosignature of thermophilic iron-reducing bacteria and its applications to the exploration of the modern deep, hot biosphere and the emergence of iron-reducing bacteria in early precambrian oceans

TitleHexagonal platelet-like magnetite as a biosignature of thermophilic iron-reducing bacteria and its applications to the exploration of the modern deep, hot biosphere and the emergence of iron-reducing bacteria in early precambrian oceans
Authors
KeywordsBanded iron formation
Biosignatures
Deep subsurface biosphere
Iron-reducing bacteria
Magnetite
Issue Date2012
PublisherMary Ann Liebert, Inc Publishers. The Journal's web site is located at http://www.liebertpub.com/ast
Citation
Astrobiology, 2012, v. 12 n. 12, p. 1100-1108 How to Cite?
AbstractDissimilatory iron-reducing bacteria are able to enzymatically reduce ferric iron and couple to the oxidation of organic carbon. This mechanism induces the mineralization of fine magnetite crystals characterized by a wide distribution in size and irregular morphologies that are indistinguishable from authigenic magnetite. Thermoanaerobacter are thermophilic iron-reducing bacteria that predominantly inhabit terrestrial hot springs or deep crusts and have the capacity to transform amorphous ferric iron into magnetite with a size up to 120 nm. In this study, I first characterize the formation of hexagonal platelet-like magnetite of a few hundred nanometers in cultures of Thermoanaerobacter spp. strain TOR39. Biogenic magnetite with such large crystal sizes and unique morphology has never been observed in abiotic or biotic processes and thus can be considered as a potential biosignature for thermophilic iron-reducing bacteria. The unique crystallographic features and strong ferrimagnetic properties of these crystals allow easy and rapid screening for the previous presence of iron-reducing bacteria in deep terrestrial crustal samples that are unsuitable for biological detection methods and, also, the search for biogenic magnetite in banded iron formations that deposited only in the first 2 billion years of Earth with evidence of life.
DescriptionResearch article
Persistent Identifierhttp://hdl.handle.net/10722/177351
ISSN
2015 Impact Factor: 2.628
2015 SCImago Journal Rankings: 0.836
PubMed Central ID
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorLi, Yen_US
dc.date.accessioned2012-12-18T05:03:19Z-
dc.date.available2012-12-18T05:03:19Z-
dc.date.issued2012en_US
dc.identifier.citationAstrobiology, 2012, v. 12 n. 12, p. 1100-1108en_US
dc.identifier.issn1531-1074-
dc.identifier.urihttp://hdl.handle.net/10722/177351-
dc.descriptionResearch article-
dc.description.abstractDissimilatory iron-reducing bacteria are able to enzymatically reduce ferric iron and couple to the oxidation of organic carbon. This mechanism induces the mineralization of fine magnetite crystals characterized by a wide distribution in size and irregular morphologies that are indistinguishable from authigenic magnetite. Thermoanaerobacter are thermophilic iron-reducing bacteria that predominantly inhabit terrestrial hot springs or deep crusts and have the capacity to transform amorphous ferric iron into magnetite with a size up to 120 nm. In this study, I first characterize the formation of hexagonal platelet-like magnetite of a few hundred nanometers in cultures of Thermoanaerobacter spp. strain TOR39. Biogenic magnetite with such large crystal sizes and unique morphology has never been observed in abiotic or biotic processes and thus can be considered as a potential biosignature for thermophilic iron-reducing bacteria. The unique crystallographic features and strong ferrimagnetic properties of these crystals allow easy and rapid screening for the previous presence of iron-reducing bacteria in deep terrestrial crustal samples that are unsuitable for biological detection methods and, also, the search for biogenic magnetite in banded iron formations that deposited only in the first 2 billion years of Earth with evidence of life.-
dc.languageengen_US
dc.publisherMary Ann Liebert, Inc Publishers. The Journal's web site is located at http://www.liebertpub.com/ast-
dc.relation.ispartofAstrobiologyen_US
dc.subjectBanded iron formation-
dc.subjectBiosignatures-
dc.subjectDeep subsurface biosphere-
dc.subjectIron-reducing bacteria-
dc.subjectMagnetite-
dc.titleHexagonal platelet-like magnetite as a biosignature of thermophilic iron-reducing bacteria and its applications to the exploration of the modern deep, hot biosphere and the emergence of iron-reducing bacteria in early precambrian oceansen_US
dc.typeArticleen_US
dc.identifier.emailLi, Y: yiliang@hku.hken_US
dc.identifier.authorityLi, Y=rp01354en_US
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1089/ast.2012.0847-
dc.identifier.pmid23145573-
dc.identifier.pmcidPMC3522128-
dc.identifier.scopuseid_2-s2.0-84871000803-
dc.identifier.hkuros212627en_US
dc.identifier.volume12-
dc.identifier.issue12-
dc.identifier.spage1100-
dc.identifier.epage1108-
dc.identifier.isiWOS:000312561600002-
dc.publisher.placeUnited States-

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