1. Department of Biological Sciences; University of Manitoba; Winnipeg MB R3T 2N2 Canada
2. Department of Microbiology; University of Manitoba; Winnipeg MB R3T 2N2 Canada
3. Department of Biology; University of Ottawa; Ottawa Ontario K1N 6N5 Canada
4. Department of Chemistry; University of Ottawa; Ottawa ON K1N 6N5 Canada
5. Department of Coastal Sciences, Gulf Coast Research Laboratory; University of Southern Mississippi, 703 East Beach Drive; Ocean Springs MS U.S.A.