1. Department of Earth Sciences; University of Geneva; Geneva Switzerland
2. Laboratoire de Géologie de Lyon; Lyon 1 University; Villeurbanne France
3. Institute F.-A. Forel; University of Geneva; Geneva Switzerland
4. Microbiology unit; University of Geneva; Geneva Switzerland
5. Institute of Geosciences; Friedrich Schiller University Jena; Jena Germany
6. Service de l'Ecologie de l'Eau (SECOE); Geneva Switzerland
7. Centre for Microscopy; Characterisation and Analysis; The University of Western Australia; Perth WA Australia
8. CARRTEL of Thonon-les-Bains; INRA; Thonon-les-Bains France