Rapid method for distinction of gram-negative from gram-positive bacteria

  • T. Gregersen
Industrial Microbiology


A rapid method for distinction between gram-negative and grampositive bacteria by means of a 3% solution of potassium hydroxide is tested on 71 gram-positive and 55 gram-negative bacterial strains. The method proved reliable with one exception only, a Bacillus macerans strain. That strain was definately gram-negative on staining. Other Bacillus strains were proved gram-positive by the test, even those being gram-negative on staining.


Potassium Hydroxide Bacillus Bacterial Strain Potassium Hydroxide 
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Copyright information

© Springer-Verlag 1978

Authors and Affiliations

  • T. Gregersen
    • 1
  1. 1.Veterinary Faculty for F.A.O. FellowsThe Royal Veterinary and Agricultural UniversityCopenhagen V.Denmark

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