The authors would like to thank the following people for their help and support in seeing this project to completion:  Rhonda Moeller, Ronna Torres, Bimpe Adesina and everyone in the Mason lab, Dr. Mason for his guidance, and CRG Marine Labs for the use of their instrument.  Special thanks to Doug Lloyd for his time and instrumental expertise.  

Thanks to the SAS center and Dr. Lopez for their encouragement.  This project was supported by NSF Grants # DBI-9978806, OCE-9977564 and MSD Grant # R25GM58482.