History of penicillin History of penicillin The history of penicillin follows a number of observations and discoveries of apparent evidence of antibiotic activity in molds before the modern isolation of the chemical penicillin in 1928. There are anecdotes about ancient societies using molds to treat infections, and in the following centuries many people observed the inhibition of bacterial growth by various molds. However, it is unknown if the species involved were "Penicillium" species or if the antimicrobial substances produced were penicillin. The Scottish physician Alexander Fleming was the first to suggest that a "Penicillium" mold must secrete an antibacterial substance, and the first
Valentine S. McClatchy for Mexicans to gain a classification of their race to ensure they would not be able to be exempt from the 1924 Immigration Act. In 1937, he lobbied to strip Kibei, Japanese Americans born in the United States who were sent to Japan to study or visit family for an extended time, of their citizenship if they had been in Japan for more than a year. He died of a heart condition on May 15, 1938. Valentine S. McClatchy Valentine Stuart McClatchy (August 29, 1857 – May 15, 1938) was an American newspaper owner and journalist. As publisher of "The