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Applied and Environmental Microbiology, February 2000, p. 820-824, Vol. 66, No. 2
0099-2240/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

In Situ Analysis of Sulfate-Reducing Bacteria Related to Desulfocapsa thiozymogenes in the Chemocline of Meromictic Lake Cadagno (Switzerland)

Mauro Tonolla,1,* Antonella Demarta,1 Sandro Peduzzi,1 Dittmar Hahn,2 and Raffaele Peduzzi1

Cantonal Institute of Bacteriology, Microbial Ecology, University of Geneva, CH-6904 Lugano, Switzerland,1 and Department of Chemical Engineering, Chemistry and Environmental Science, New Jersey Institute of Technology, and Department of Biological Sciences, Rutgers University, Newark, New Jersey 07102-18112

Received 25 August 1999/Accepted 30 November 1999

Comparative sequence analysis of a 16S rRNA gene clone library from the chemocline of the meromictic Lake Cadagno (Switzerland) retrieved two clusters of sequences resembling sulfate-reducing bacteria within the family Desulfovibrionaceae. In situ hybridization showed that, similar to sulfate-reducing bacteria of the family Desulfobacteriaceae, bacteria of one cluster with similarity values to the closest cultured relatives of between 92.6 and 93.1% resembled free cells or cells loosely attached to other cells or debris. Bacteria of the second cluster closely related to Desulfocapsa thiozymogenes DSM7269 with similarity values between 97.9 and 98.4% were generally associated with aggregates of different small-celled phototrophic sulfur bacteria, suggesting a potential interaction between the two groups of bacteria.

* Corresponding author. Mailing address: Cantonal Institute of Bacteriology, Microbial Ecology, Via Ospedale 6, CH-6904 Lugano, Switzerland. Phone: 41-91-923 25 22. Fax: 41-91-922 09 93. E-mail: mauro.tonolla{at}ti.ch.

Applied and Environmental Microbiology, February 2000, p. 820-824, Vol. 66, No. 2
0099-2240/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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