1. Department
of Chemistry, University of Manitoba, Winnipeg, MB R3T 2N2, Canada
2. Institute
of Animal Nutrition, Northeast Agricultural University, Harbin, Heilongjiang 150030, P.R. China
3. Department
of Microbiology, University of Manitoba, Winnipeg, MB R3T 2N2, Canada
4. Department
of Medical Microbiology, University of Manitoba, Winnipeg, MB R3T 1R9, Canada