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jan 1, 1884 - 1884: Hans Christian Gram develops a way of classifying bacteria into two major categories, Gram-positive and Gram-negative. This technique, the Gram stain, continues to be a standard procedure in medical microbiology today.
Added to timeline:
Science
By
Fede 2005
24 Jan 2020
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Date:
jan 1, 1884
Now
~ 140 years ago
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