such as E. coli, have a thin peptidoglycan layer sandwiched between a porous outer membrane and an inner membrane. In this simplified diagram of gram staining, bacterial cells are first treated ...

Escherichia coli is an example of a common Gram negative bacterium. The Gram stain procedure was developed by Hans Christian Gram in the 1800s and was one of the first techniques taught to ...

A gram stain uses a stain to check the sample for infection. This stain changes color based on the type of bacteria causing the infection. If it turns purple, the person has an infection caused by ...