| 词汇 | petri dish |
| 词源 | petri dish. German scientist Julius Richard Petri invented this thin glass or plastic dish with a loose cover commonly used in laboratories today. The shallow dish named for the bacteriolo- gist, who died in 1921, is generally employed in making bacte- ria cultures. Petri was an assistant of the great German scientist Robert Koch when he devised his dishes in 1887. Koch—the first scientist to introduce a rationalized system of bacteria culturing—had previously grown bacteria in a gel on flat glass slides, his assistant substituting the shallow glass dishes with covers that have been used ever since. |
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