Following World War II American sciences made a critical contribution to the development of print penicillin by

The several kinds of penicillin synthesized by various species of the mold Penicillium may be divided into two classes: the naturally occurring penicillins (those formed during the process of mold fermentation) and the semisynthetic penicillins (those in which the structure of a chemical substance-6-aminopenicillanic ...