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What does Gram-negative mean?

Looking for the meaning or definition of the word Gram-negative? Here's what it means.

Adjective
  1. Alternative form of gram-negative (Note: The form with capital G is the only form given in the American Heritage Dictionary. "Gram" is actually a proper name.)
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Examples
Gram-negative folliculitis should be suspected if inflammatory acne worsens after several months of oral antibiotic therapy.
Besifloxacin is an 8-chloro fluoroquinolone with a N-1 cyclopropyl group that has activity against Gram-positive and Gram-negative bacteria.
The Gram-positive bacteria are violet and the Gram-negative are red.
It has a broad spectrum of activity against a wide range of Gram-positive and Gram-negative bacteria.
The latter are Gram-negative, and vary greatly in both dimensions as well as in form.
Gram-negative bacteria were more resistant.

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