1. Department of Chemistry; Tuskegee University; Tuskegee AL USA
2. Department of Biology; Tuskegee University; Tuskegee AL USA
3. Laboratory of Ethnomedicine, Parasitology and Drug Discovery; Tuskegee University; Tuskegee AL USA
4. Department of Pathobiology; College of Veterinary Medicine; University of Illinois; Urbana Champaign IL USA