1. Center for Stable Isotope Biogeochemistry; 1140 Valley Life Science Building, University of California at Berkeley; Berkeley CA 94720 USA
2. MLS Analytical; 21380 Sea Ray Lane Wilmington IL 60481 USA
3. EA Consumables, Inc.; 5090 Central Hwy, STE 3A Pennsauken NJ 08109 USA
4. Department of Environmental Science, Policy and Management; 130 Mulford Hall, University of California; Berkeley CA 94720 USA
5. Department of Organismic and Evolutionary Biology; Harvard University; 16 Divinity Avenue, Biological Laboratories 4081 Cambridge MA 02138 USA