Publikation: Electron shuttling via humic acids in microbial iron(III) reduction in a freshwater sediment
Dateien
Datum
Autor:innen
Herausgeber:innen
ISSN der Zeitschrift
Electronic ISSN
ISBN
Bibliografische Daten
Verlag
Schriftenreihe
Auflagebezeichnung
URI (zitierfähiger Link)
DOI (zitierfähiger Link)
Internationale Patentnummer
Link zur Lizenz
Angaben zur Forschungsförderung
Projekt
Open Access-Veröffentlichung
Sammlungen
Core Facility der Universität Konstanz
Titel in einer weiteren Sprache
Publikationstyp
Publikationsstatus
Erschienen in
Zusammenfassung
The biological and chemical potential for electron shuttling via humic acids was evaluated by analyzing the depth distribution of humicacid-reducing and iron-reducing bacteria in a freshwater sediment, and correlating it to the redox characteristics of humic acids and iron. Physicochemical analysis of profundal sediments of Lake Constance revealed a distinct stratification, with oxygen respiration, microbial iron and sulfate reduction, and methanogenesis allocatable to defined layers. Among the acid-extractable iron in the surface layer, ferric iron (Fe(III)) was dominant, whereas ferrous iron (Fe(II)) prevailed below 2 cm depth. Humic acids showed a higher electron-accepting (oxidizing) capacity in the surface layer and a higher reducing capacity in deeper layers. The more reduced redox state of humic acids in deeper layers was probably due to reduction by humic-acid-reducing microorganisms. Most-probable-number analysis revealed that the sediments contained populations of humic-acid-reducing bacteria that (i) were substantially larger than those of the iron-reducing bacteria in the respective sediment layers and (ii) were in the same range as those of the fermenting bacteria. Our results suggest that microbial reduction of humic acids and subsequent chemical reduction of poorly soluble iron(III) minerals by the reduced humic acids represents an important path of electron flow in anoxic natural environments such as freshwater sediments.
Zusammenfassung in einer weiteren Sprache
Fachgebiet (DDC)
Schlagwörter
Konferenz
Rezension
Zitieren
ISO 690
KAPPLER, Andreas, Marcus BENZ, Bernhard SCHINK, Andreas BRUNE, 2004. Electron shuttling via humic acids in microbial iron(III) reduction in a freshwater sediment. In: FEMS microbiology ecology. 2004, 47(1), pp. 85-92. eISSN 1574-6941. Available under: doi: 10.1016/S0168-6496(03)00245-9BibTex
@article{Kappler2004Elect-8804, year={2004}, doi={10.1016/S0168-6496(03)00245-9}, title={Electron shuttling via humic acids in microbial iron(III) reduction in a freshwater sediment}, number={1}, volume={47}, journal={FEMS microbiology ecology}, pages={85--92}, author={Kappler, Andreas and Benz, Marcus and Schink, Bernhard and Brune, Andreas} }
RDF
<rdf:RDF xmlns:dcterms="http://purl.org/dc/terms/" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:bibo="http://purl.org/ontology/bibo/" xmlns:dspace="http://digital-repositories.org/ontologies/dspace/0.1.0#" xmlns:foaf="http://xmlns.com/foaf/0.1/" xmlns:void="http://rdfs.org/ns/void#" xmlns:xsd="http://www.w3.org/2001/XMLSchema#" > <rdf:Description rdf:about="https://kops.uni-konstanz.de/server/rdf/resource/123456789/8804"> <dc:rights>terms-of-use</dc:rights> <dc:contributor>Schink, Bernhard</dc:contributor> <dcterms:title>Electron shuttling via humic acids in microbial iron(III) reduction in a freshwater sediment</dcterms:title> <dc:contributor>Brune, Andreas</dc:contributor> <dc:format>application/pdf</dc:format> <dc:language>eng</dc:language> <dc:contributor>Benz, Marcus</dc:contributor> <void:sparqlEndpoint rdf:resource="http://localhost/fuseki/dspace/sparql"/> <dcterms:issued>2004</dcterms:issued> <dcterms:rights rdf:resource="https://rightsstatements.org/page/InC/1.0/"/> <dcterms:isPartOf rdf:resource="https://kops.uni-konstanz.de/server/rdf/resource/123456789/28"/> <dspace:hasBitstream rdf:resource="https://kops.uni-konstanz.de/bitstream/123456789/8804/1/Electron_shuttling_via_humic_acids_in_microbial_iron.pdf"/> <dc:contributor>Kappler, Andreas</dc:contributor> <dcterms:hasPart rdf:resource="https://kops.uni-konstanz.de/bitstream/123456789/8804/1/Electron_shuttling_via_humic_acids_in_microbial_iron.pdf"/> <dcterms:bibliographicCitation>First publ. in: FEMS microbiology ecology 47 (2004), pp. 85-92</dcterms:bibliographicCitation> <dc:creator>Brune, Andreas</dc:creator> <dcterms:available rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2011-03-24T17:46:35Z</dcterms:available> <dspace:isPartOfCollection rdf:resource="https://kops.uni-konstanz.de/server/rdf/resource/123456789/28"/> <foaf:homepage rdf:resource="http://localhost:8080/"/> <dc:date rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2011-03-24T17:46:35Z</dc:date> <dc:creator>Schink, Bernhard</dc:creator> <bibo:uri rdf:resource="http://kops.uni-konstanz.de/handle/123456789/8804"/> <dc:creator>Benz, Marcus</dc:creator> <dc:creator>Kappler, Andreas</dc:creator> <dcterms:abstract xml:lang="eng">The biological and chemical potential for electron shuttling via humic acids was evaluated by analyzing the depth distribution of humicacid-reducing and iron-reducing bacteria in a freshwater sediment, and correlating it to the redox characteristics of humic acids and iron. Physicochemical analysis of profundal sediments of Lake Constance revealed a distinct stratification, with oxygen respiration, microbial iron and sulfate reduction, and methanogenesis allocatable to defined layers. Among the acid-extractable iron in the surface layer, ferric iron (Fe(III)) was dominant, whereas ferrous iron (Fe(II)) prevailed below 2 cm depth. Humic acids showed a higher electron-accepting (oxidizing) capacity in the surface layer and a higher reducing capacity in deeper layers. The more reduced redox state of humic acids in deeper layers was probably due to reduction by humic-acid-reducing microorganisms. Most-probable-number analysis revealed that the sediments contained populations of humic-acid-reducing bacteria that (i) were substantially larger than those of the iron-reducing bacteria in the respective sediment layers and (ii) were in the same range as those of the fermenting bacteria. Our results suggest that microbial reduction of humic acids and subsequent chemical reduction of poorly soluble iron(III) minerals by the reduced humic acids represents an important path of electron flow in anoxic natural environments such as freshwater sediments.</dcterms:abstract> </rdf:Description> </rdf:RDF>