
Molecular model of penicillin by Dorothy M Crowfoot Hodgkin, England, 1945
1945
1945
1942
1946
1839 (original); circa 1988 (replica)
1943
1830 (original); 1967 (model)
1903 (original); 1982 (model)
circa 1942
1945
1940
1940
1955; 1830
1946
1944
1938 and 1951
1944-1945
2000-100 BCE
1940-1944
1943
1942
1946
1942
1946
1940
1801-1892 (prepared); 1946 (element replaced)
1940-1945
1942-1945
1943-1945
1940
1945-1946
1940
circa 1940
1942-1945
1940
1940
1942
1944
4000-2001 BCE
circa 1945
1952-3
1956-09
1956-09
1940-1945
1940
1940
1990-95
1942-1943
2050-1750 BCE
1940
1944-1945