Most species of bacteria can be broadly divided into two groups, known as gram-positive and gram-negative. These categories ...

Gram positive vs gram negative Gram positive bacteria are surrounded by a single thick peptidoglycan cell wall and are therefore termed monoderms. Gram negative bacteria have a much thinner ...

Gram-negative bacteria show pink or red on staining and have thin walls. They release different toxins and affect the body in different ways. Gram-positive and Gram-negative are types of bacteria.

Gram-positive bacteria have thick cell walls. A Gram stain test, which involves a chemical dye, stains the bacterium’s cell wall purple. On the other hand, gram-negative bacteria stain pink instead.

When bacteria retain the crystal violet dye during the Gram stain test, they are called Gram-positive bacteria. Learn more here.

What do the results of a gram stain mean? If your gram stain results are negative, it means no bacteria were found in your sample. If they’re positive, it means bacteria were present.

Published by Hans Christian Gram in 1884, gram staining distinguishes gram-positive bacteria (purple) from gram-negative bacteria (pink). Gram-positive critters, such as staph, have a thick ...

Find out the differences between gram-positive bacillus and gram-negative bacillus and how they may affect health.