death_date death_place birth_place image_size field birth_date known_for signature prizes image article_title name alma_mater
11 march 1955 london , england lochfield , east ayrshire , scotland 240px bacteriology , immunology 06 august 1881 discovery of penicillin alexander fleming signature.svg frs frse frcs -lrb- eng -rrb- knight bachelor -lrb- 1944 -rrb- -lrb- 1943 -rrb- nobel prize -lrb- 1945 -rrb- synthetic production of penicillin tr1468.jpg alexander fleming
 sir alexander fleming royal imperial college london polytechnic institution st mary 's hospital medical school
alexander fleming

sir alexander fleming , frse , frs , frcs -lrb- eng -rrb- -lrb- 6 august 188111 march 1955 -rrb- was a scottish biologist , pharmacologist and botanist .
he wrote many articles on bacteriology , immunology , and chemotherapy .
his best-known discoveries are the enzyme lysozyme in 1923 and the antibiotic substance benzylpenicillin -lrb- penicillin g -rrb- from the mould `` penicillium notatum '' in 1928 , for which he shared the nobel prize in physiology or medicine in 1945 with howard florey and ernst boris chain .
