
Molecular model of penicillin by Dorothy M Crowfoot Hodgkin, England, 1945
1945
1945
1942
1943
1945
1830 (original); 1967 (model)
1839 (original); circa 1988 (replica)
1952-3
1947
1948
1945
1948
1946
1943
1948
1955; 1830
1938 and 1951
1944-1945
1943
1942
1948
1942
1946
1944
circa 1942
1946-1948
1946
2000-100 BCE
1946
1948
1947
1946
1945-1948
1948
1990-96
1948
1801-1892 (prepared); 1946 (element replaced)
1948
1947-1948
1946-1948
1942-1945
1942-1945
4000-2001 BCE
circa 1947
1943-1945
1948
1947
circa 1945
1948
1947
1945-1946