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

Learn the differences between gram positive vs gram negative bacteria, including structure, stain results and examples of key bacterial species.

Both Gram-positive and Gram-negative bacteria can cause disease. However, they require different treatments. Therefore, medical professionals need to be able to identify the type of bacteria to ...

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

Positive shapes are the shapes of actual objects. Negative shapes are the areas between these objects. The way positive and negative shapes act together creates the atmosphere of a composition ...

Henri Matisse played with ideas of positive and negative shapes with his cut-out works. With Icarus, is the black figure a positive shape against a blue background?

Gram-positive bacteria are bacteria with thick cell walls. In a Gram stain test, these organisms yield a positive result. Here’s why knowing whether the result is positive or negative is important.

If they’re positive, it means bacteria were present. Because of the staining technique used, gram-positive bacteria will appear purple under a microscope and gram-negative bacteria will appear pink.