
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)
1940
1952-3
1940
1940
1940-1945
1945
1943
1955; 1830
1938 and 1951
1944-1945
1940-1944
1943
1942
1942
1944
circa 1942
1939
2000-100 BCE
1939-1945
1940
1940
1940
1939
1990-96
1940
1801-1892 (prepared); 1946 (element replaced)
1940
1940-1945
1942-1945
1942-1945
circa 1940
4000-2001 BCE
1943-1945
1939
1940
circa 1939
circa 1945
1942
1944
1903 (original); 1982 (model)
1940-1945
1945
1944
1942-1943