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Weathering of granite from the Damma glacier area: the contribution of cyanogenic bacteria


Wongfun, Nuttakan; Plötze, Michael; Furrer, Gerhard; Brandl, Helmut (2014). Weathering of granite from the Damma glacier area: the contribution of cyanogenic bacteria. Geomicrobiology Journal, 31(2):93-100.

Abstract

The dissolution potential of five cyanogenic bacteria was studied at 25 °C during 32 days using granite material from the Damma glacier (Central Alps, Switzerland) as the sole source of nutrients. The bacterial species Pseudomonas fluorescens and Pseudomonas sp. CCOS 191 were the most effective to exudate various organic acids and consequently mobilised Fe. The molecular mechanisms include both, proton- promoted and ligand-promoted dissolution, preferentially at pH below 5 and in the pH range between 5.0 and 5.8, respectively. In addition, bacterially produced cyanide plays a minor role through the formation of soluble hexacyanoferrate complexes. To our knowledge, this study is the first that reveals the direct measurement of metal-cyanide complexes formed during biotic granite weathering.

Abstract

The dissolution potential of five cyanogenic bacteria was studied at 25 °C during 32 days using granite material from the Damma glacier (Central Alps, Switzerland) as the sole source of nutrients. The bacterial species Pseudomonas fluorescens and Pseudomonas sp. CCOS 191 were the most effective to exudate various organic acids and consequently mobilised Fe. The molecular mechanisms include both, proton- promoted and ligand-promoted dissolution, preferentially at pH below 5 and in the pH range between 5.0 and 5.8, respectively. In addition, bacterially produced cyanide plays a minor role through the formation of soluble hexacyanoferrate complexes. To our knowledge, this study is the first that reveals the direct measurement of metal-cyanide complexes formed during biotic granite weathering.

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Additional indexing

Item Type:Journal Article, not refereed, original work
Communities & Collections:07 Faculty of Science > Institute of Evolutionary Biology and Environmental Studies
Dewey Decimal Classification:570 Life sciences; biology
590 Animals (Zoology)
Uncontrolled Keywords:cyanogenic bacteria, granite, dissolution, cyanide, organic acids
Language:English
Date:2014
Deposited On:23 Aug 2013 06:45
Last Modified:05 Apr 2016 16:55
Publisher:Taylor & Francis Inc.
ISSN:0149-0451
Additional Information:This is an Author's Accepted Manuscript of an article published in Wongfun, Nuttakan; Plötze, Michael; Furrer, Gerhard; Brandl, Helmut (2013). Weathering of granite from the Damma glacier area: the contribution of cyanogenic bacteria. Geomicrobiology Journal:Epub ahead of print. 2013 copyright Taylor & Francis, available online at: http://www.tandfonline.com/10.1080/01490451.2013.802396.
Publisher DOI:https://doi.org/10.1080/01490451.2013.802396

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