1. Department of Microbiology, Clemson University, Clemson, South Carolina.
2. Departments of Microbiology and Physics, Clemson University, Clemson, South Carolina.
3. Greenville Memorial Hospital–Clemson University Research Cooperative, Clemson University, Clemson, South Carolina.
4. Small Fruit Research Station, Poplarville.
5. Natural Products Utilization Research Unit; and The Thad Cochran National Centre for Natural Products Research, University of Mississippi, University, Mississippi, U.S.A.