An experienced microbiologist inoculates both Staphylococcus…

An experienced microbiologist inoculates both Staphylococcus epidermidis and Escherichia coli into a culture medium.  After incubation, only the E. coli has grown upon the media.  What is the most likely explanation for the absence of the Staphylococcus epidermidis?

The most common differential staining technique performed in…

The most common differential staining technique performed in microbiology labs around the world, used to differentiate between those bacteria that have only peptidoglycan in their cell walls and those that have both peptidoglycan and lipopolysaccharide, is the: