Most species of bacteria can be broadly divided into two groups, known as gram-positive and gram-negative. These categories reflect big differences in the microbes' biology, and they also dictate ...

This medium is both selective and differential. The selective ingredients are the bile salts and the dye, crystal violet which inhibit the growth of Gram-positive bacteria. The differential ingredient ...

A silicon chip biosensor the size of a grain of sand and developed at the University of Rochester can distinguish Gram-negative from Gram-positive bacteria. According to Benjamin Miller, assistant ...

A category of bacteria that produce a positive result with a violet dye staining technique, due to the presence of thick layer of peptidoglycan in their cell walls (bacteria that do not appear violet ...