1. Division of Molecular Physics, Department of Physics, Chemistry and Biology, Linköping University, SE-581 83 Linköping, Sweden
2. Division of Microbiology and Molecular Medicine, Department of Clinical and Experimental Medicine, Linköping University, SE-581 83 Linköping, Sweden
3. Duke University Marine Laboratory, Nicholas School of the Environment, Duke University, Beaufort, North Carolina 28516-9721, United States