How to Do a Gram Stain: Differentiate Gram-positive and Gram-negative Bacteria
Channel: Tami Guy, MS, CPPS
Date: 2012-09-24

Step-by-step video and audio instructions on how to Gram stain a slide that includes three bacterial smears; a Gram+ control (known Gram-positive bacteria), a Gram- control (known Gram-negative bacteria) and an unknown.

This video also has photos of a Gram stained slides, as well as photo micrographs of Gram stained Staphylococcus (a Gram+) and Escherichia (a Gram-).

For a video on how to prepare a bacterial smear for Gram staining see: http://youtu.be/YpDglhibW4k

Video by Tami (Guy) Port, Chief Executive Nerd at ScienceProfOnline.com. For the lab materials that go with this movie, see the Virtual Microbiology Classroom Identification of Unknown Bacteria Laboratory Main Page at ScienceProfOnline.com.