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

Gram-positive bacteria show blue or purple after Gram-staining in a laboratory test. They have thick cell walls. Gram-negative bacteria show pink or red on staining and have thin walls.

Being able to differentiate bacterial species is important for a host of reasons. While molecular techniques can determine the specific species, even without getting into the molecular nitty gritty, ...

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.

The difference between gram-negative and gram-positive bacteria can affect their recommended treatment plan. ... If your gram stain is negative for disease-causing bacteria, ...

Gram-negative bacteria may appear red under the microscope because red-pink iodine is used alongside the Gram stain as a control. Both Gram-positive and Gram-negative bacteria can cause disease ...

Gram-negative bacteria have a hard, protective outer shell. Their peptidoglycan layer is much thinner than that of gram-positive bacilli. Gram-negative bacteria are harder to kill because of their ...