1. Institute for Biogeochemistry and Marine Chemistry; University of Hamburg; Bundesstr. 55; 20146; Hamburg; Germany
2. Geobiology Group, Geoscience Centre; Georg-August-University Göttingen; Goldschmidtstr. 3; 37077; Göttingen; Germany
3. Pennsylvania State University; 127 Sackett Building; University Park; PA; 16802; USA
4. Federal Institute for Geosciences and Natural Resources; Section Geomicrobiology; Stilleweg 2; 30655; Hannover; Germany