1. Department of Marine Biogeochemistry and Toxicology, Royal Netherlands Institute for Sea Research, Post Office Box 59, 1790 AB Den Burg, Texel, Netherlands.
2. Department of Biotechnology, Environmental Biotechnology Group, Delft University of Technology, Julianalaan 67, 2628 BC Delft, Netherlands.
3. Petroleum and Environmental Geochemistry Group, School of Earth, Ocean and Environmental Sciences, University of Plymouth, Drake Circus, Plymouth, Devon PL4 8AA, UK.
4. Faculté des Sciences, ISOmer, Université de Nantes, UPRES-EA 2663, 2 Rue de la Housinière, 44322 Nantes Cedex 3, France.
5. Department of Geological and Environmental Sciences, Stanford University, Stanford CA 94305–2115, USA.