The Hans Christian Gram reference article from the English Wikipedia on 24-Apr-2004
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Hans Christian Gram

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Hans Christian Gram (1853-1928) was a Danish bacteriologist.

He travelled throughout Europe between 1878 and 1885. In Berlin, in 1884, he developed a method for distinguishing between two major classes of bacteria. This technique, the Gram Stain, continues to be a standard procedure in medical microbiology.

In 1891, Gram taught as a professor at the University of Copenhagen.