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

Gram negative bacteria. Gram negative bacteria appear a pale reddish color when observed under a light microscope following Gram staining. This is because the structure of their cell wall is unable to ...

Infectious bacteria are growing increasingly resistant to drugs, which is becoming a serious threat to public health worldwide. Bacteria can be classified based on various characteristics, such as by ...

Gram negative bacteria cell wall structure. Gram negative bacteria are characterized by the presence of the periplasmic space, which is a single layer of peptidoglycan sandwiched between the ...

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.

Peptidoglycan layer: In Gram-positive bacteria, the peptidoglycan is a 20 to 80 nm (nanometer) thick structure found within its cell wall. This layer is only 2 to 3 nm thick in Gram-negative bacteria.

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, ...

In comparison to Gram negative bacteria, the periplasmic space of Gram positive bacteria is smaller in volume and the cell wall is much thicker, ranging from 15 and 80 nanometers.