• Treffer 6 von 0
Zurück zur Trefferliste

The impact of thermophilic sulphate-reducing bacteria on serpentinization reactions

  • Serpentinization is an important process in the Earth’s oceanic lithosphere, where the reaction of olivine und pyroxene with water forms serpentine and magnetite. During this alteration reaction gaseous hydrogen is produced abiotically, which has been inferred as an essential energy source for microbes living in these systems. The serpentinization reaction directly influences the chemical composition of the lithosphere and the ocean chemistry and, thus, connects the lithosphere, hydrosphere and biosphere. While the geochemical processes are rather well studied in these systems, the biological influence on the processes is not well understood. However, microbial activity has been documented for serpentinization systems, e.g. along the Mid-Atlantic Ridge, in surficial carbonate formations constraining the activity of sulfate-reducing bacteria and methanogenic archaea. The question arises whether microbial populations can be sustained by the hydrothermal alteration of the oceanicSerpentinization is an important process in the Earth’s oceanic lithosphere, where the reaction of olivine und pyroxene with water forms serpentine and magnetite. During this alteration reaction gaseous hydrogen is produced abiotically, which has been inferred as an essential energy source for microbes living in these systems. The serpentinization reaction directly influences the chemical composition of the lithosphere and the ocean chemistry and, thus, connects the lithosphere, hydrosphere and biosphere. While the geochemical processes are rather well studied in these systems, the biological influence on the processes is not well understood. However, microbial activity has been documented for serpentinization systems, e.g. along the Mid-Atlantic Ridge, in surficial carbonate formations constraining the activity of sulfate-reducing bacteria and methanogenic archaea. The question arises whether microbial populations can be sustained by the hydrothermal alteration of the oceanic lithosphere and whether the microbial populations directly influence and accelerate the serpentinization process. For our experimental setup the surface of mono-mineral cubes of olivine and pyroxene are directly exposed to sulfate-reducing bacteria, using an anaerobic semi-continuous fermenter system. Besides mesophilic sulfate-reducing Bacteria of the Desulfovibrio genus also thermophilic sulfate-reducing enrichment cultures from geothermal, saline fluid systems were included to investigate the mineral surface alteration. The mineral alteration was monitored using electron microprobe analysis, scanning electron microscopy and isotope fractionation of sulfide, while biofilm formation was documented and sulfate reduction activity measured.zeige mehrzeige weniger

Volltext Dateien herunterladen

  • Poster_VAAM_Sameith_final.pdf
    eng

Metadaten exportieren

Weitere Dienste

Teilen auf Twitter Suche bei Google Scholar Anzahl der Zugriffe auf dieses Dokument
Metadaten
Autor*innen:S. Günther
Koautor*innen:E.M. Schwarzenbach, Janin Sameith
Dokumenttyp:Posterpräsentation
Veröffentlichungsform:Präsentation
Sprache:Englisch
Jahr der Erstveröffentlichung:2017
DDC-Klassifikation:Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Sanitär- und Kommunaltechnik; Umwelttechnik
Freie Schlagwörter:Sulfat-reduzierende Bakterien
Sulfate-reducing bacteria
Veranstaltung:VAAM Jahrestagung
Veranstaltungsort:Würzburg, Germany
Beginndatum der Veranstaltung:05.03.2017
Enddatum der Veranstaltung:08.03.2017
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:22.03.2017
Referierte Publikation:Nein
Einverstanden
Diese Webseite verwendet technisch erforderliche Session-Cookies. Durch die weitere Nutzung der Webseite stimmen Sie diesem zu. Unsere Datenschutzerklärung finden Sie hier.