
Molecular model of penicillin by Dorothy M Crowfoot Hodgkin, England, 1945
1945
1945
1946-1950
1949
1949
1948-1950
1945
1948
1946
1948
1947
1947
1948
1950
1950
1951
1949
1951
1946
1951
1951
1955; 1830
circa 1950
1950
1951
1951
1951
1946-1948
1938 and 1951
1946
1950
2000-100 BCE
1950-1951
1945
circa 1950
1948
1946
1948
1949
1946
1950
1945-1948
1949
1903 (original); 1982 (model)
1951
1948
1951
1951
1990-96
circa 1945
1948