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At the hospital, he invented a new way to stain tissue samples that allowed doctors to see and identify the tuberculosis bacillus for the first time. Also at the hospital, he began using methylene blue to successfully treat neurological disorders suffered by his patients.
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Starting in 1879, and continuing through 1885, Ehrlich published 37 different scientific papers on cellular biology. The last, 'The Requirement of the Organism for Oxygen', was his magnum opus on understanding how cells process oxygen, a vital function of mammalian biology.
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This work on diphtheria would later lead to a Nobel Prize in Medicine for one of his colleagues, an award that Ehrlich felt he should've also received.
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Bad Homburg, Hesse, in Germany. He was laid to rest in Frankfurt-am-Main's Jewish cemetery. His tombstone is a tourist destination for scientists even today.