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Gram-negative bacteria


Gram-negative bacteria are bacteria that do not retain the crystal violet stain used in the gram-staining method of bacterial differentiation. They are characterized by their cell envelopes, which are composed of a thin peptidoglycan cell wall sandwiched between an inner cytoplasmic cell membrane and a bacterial outer membrane.


  • General 

  • Characteristics 

  • Classification 

  • Taxonomy 

  • Bacterial transformation 

  • Medical treatment 

  • Orthographic note