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Applied and Environmental Microbiology, October 2006, p. 6819-6821, Vol. 72, No. 10
0099-2240/06/$08.00+0     doi:10.1128/AEM.00694-06
Copyright © 2006, American Society for Microbiology. All Rights Reserved.

SHORT REPORT

Effect of Octamethylcyclotetrasiloxane on Methylation of Bismuth by Methanosarcina barkeri

Klaus Michalke,* Jörg Meyer, and Reinhard Hensel

Department of Microbiology, University of Duisburg-Essen, Universitaetsstr. 4, D-45177 Essen, Germany

Received 26 March 2006/ Accepted 21 July 2006

Octamethylcyclotetrasiloxane (OMCTS), a common constituent of household products, triggers the transformation of bismuth to the volatile toxic derivative trimethylbismuth by Methanosarcina barkeri, which is a representative member of the sewage sludge microflora. Comparative studies with the ionophores monensin and lasalocid, which induce effects similar to those observed for OMCTS, indicated that the stimulation of bismuth methylation is not specific for the siloxane and suggested that the stimulation observed is mainly due to facilitated membrane permeation of the metal ion.

* Corresponding author. Mailing address: Department of Microbiology, University of Duisburg-Essen, Universitaetsstr. 4, 45177 Essen, Germany. Phone: 49 201 183-4707. Fax: 49 201 183-3990. E-mail: klaus.michalke{at}uni-essen.de.

Applied and Environmental Microbiology, October 2006, p. 6819-6821, Vol. 72, No. 10
0099-2240/06/$08.00+0     doi:10.1128/AEM.00694-06
Copyright © 2006, American Society for Microbiology. All Rights Reserved.





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Copyright © 2006 by the American Society for Microbiology. All rights reserved.