7 research outputs found

    Abundance, Distribution, and Activity of Fe(II)-Oxidizing and Fe(III)-Reducing Microorganisms in Hypersaline Sediments of Lake Kasin, Southern Russia

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    The extreme osmotic conditions prevailing in hypersaline environments result in decreasing metabolic diversity with increasing salinity. Various microbial metabolisms have been shown to occur even at high salinity, including photosynthesis as well as sulfate and nitrate reduction. However, information about anaerobic microbial iron metabolism in hypersaline environments is scarce. We studied the phylogenetic diversity, distribution, and metabolic activity of iron(II)-oxidizing and iron(III)-reducing Bacteria and Archaea in pH-neutral, iron-rich salt lake sediments (Lake Kasin, southern Russia; salinity, 348.6 g liter-1) using a combination of culture-dependent and -independent techniques. 16S rRNA gene clone libraries for Bacteria and Archaea revealed a microbial community composition typical for hypersaline sediments. Most-probable-number counts confirmed the presence of 4.26×102 to 8.32×103 iron(II)-oxidizing Bacteria and 4.16×102 to 2.13×103 iron(III)-reducing microorganisms per gram dry sediment. Microbial iron(III) reduction was detected in the presence of 5 M NaCl, extending the natural habitat boundaries for this important microbial process. Quantitative real-time PCR showed that 16S rRNA gene copy numbers of total Bacteria, total Archaea, and species dominating the iron(III)-reducing enrichment cultures (relatives of Halobaculum gomorrense, Desulfosporosinus lacus, and members of the Bacilli) were highest in an iron oxide-rich sediment layer. Combined with the presented geochemical and mineralogical data, our findings suggest the presence of an active microbial iron cycle at salt concentrations close to the solubility limit of NaCl

    Einleitung in dem Edlen Lillien-Zweig/ Des Grundes und Erkäntniß der Schrifften Des Hocherleuchten Jacob Böhmens, Wie dieselben mögen gelesen und verstanden werden. Geschrieben an Henricum Prunnium/...

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    Mehrern Liebhabern derselben Schrifften zum Druck befördert Von Johannem Theodorum, Von Tchesch. Siles

    zwiefache Apologia, und Christliche Verantwortung auf die fünf lästerlichen Hauptpuncte Davids Gilberti von Utrecht/ ins gemein: Wider die Person und Schriften des theuren und hocherleuchteten Manns Jacob Böhmens ...

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    ... vor diesem in Holländischer Sprache an den Tag gegeben/ Durch Johann Theodorum von Tschesch ... An jetzo aber ... getreulich in unsere Hochteutsche Muttersprach übergesetzet/ von Eine[m] Liebhaber Göttlicher GeheimnisseDruckort und Drucker ermittelt in: BL (German books
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