S. Omar

This thesis examines the phytochemical discovery process from temperate and tropical trees. Thirty extracts of wood and bark of hardwood trees from Eastern North America were examined for insect control and antimicrobial activities. Nine of the bark extracts and four of the wood…

Warne in (21) replaced "group" by "monoid" and termed the resulting construction a bicyclic extension. We give explicit proof of an important property of this bicyclic extension semigroup in Theorem 31. Abundant semigroup theory was initiated by Fountain (6). Asibong-Ibe (1) ext…