Word: fluorescein
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Dates: during 1950-1959
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First, a drop of the specimen fluid is smeared on a microscope slide. Then it is covered with a drop of serum (from an animal) containing the antibody which develops when the suspected species of bacteria is present. This serum is tagged with fluorescein, a luminous substance. If the right antibody hits the right germ, the germ starts to glow under the microscope. If the tester has guessed wrong, no glow, and he tries again with other antibodies...
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