There are many ways of classifying bacteria. One method is based on the cell membrane. In 1884, a bacteriologist named Christian Gram created a test that could determine if a bacterium had a thick, ...

Gram-negative meningitis is an infection in the membrane surrounding your brain and spinal cord. “Gram-negative” refers to gram staining, a routine laboratory test used to determine the presence of ...

Gram staining is a type of differential staining used to distinguish between Gram positive and Gram negative bacterial groups, based on inherent differences in their cell wall constituents. Stains ...

It can be difficult to tell how much protein a food contains just by looking at it. But these photos can help make sure your protein intake stays on track.