Gram Positive vs Gram Negative



Being able to differentiate bacterial species is important for a host of reasons, from diagnosing infection or checking food safety, to identifying which species it is that gives a cheese it’s fantastic character. One such useful classification – if a bacterium is Gram positive or Gram negative - is based on the structure of bacterial cell walls.

Download this article to learn:

  • What the differences are between Gram positive and Gram negative bacteria
  • How to prepare and stain samples using a Gram staining technique
  • How staining methods can be used to identify bacterial species