อภิธานศัพท์ประวัติศาสตร์โลกและภูมิศาสตร์

(1881-1955) English scientist who, in 1928, observed that a mold called Penicillium killed germs. This discovery resulted in the development of antibiotics, which attack or weaken bacteria that cause many diseases. Antibiotics were not widely used until the 1940s.