
Molecular model of penicillin by Dorothy M Crowfoot Hodgkin, England, 1945
1945
1945
1945
1830 (original); 1967 (model)
1952-3
1946
1944
1946
1946
1946
1955; 1830
1944-1945
1938 and 1951
2000-100 BCE
1801-1892 (prepared); 1946 (element replaced)
1839 (original); circa 1988 (replica)
1903 (original); 1982 (model)
circa 1945
1945-1946
1944
4000-2001 BCE
1945
1990-95
1945
1944
circa 1945
1946
1945
1945
1945
1945
1945
1946
1945
circa 3000 BCE
post 1946.
1946
1946
1946
1946
1946
2000-1350
1950-1900
1946
1946
1945
1946
1972-3
2000-1000
1950-1920
1945-1946