Pili are filamentous surface structures that play a key role in the adhesion, colonisation and biofilm formation of Gram-positive bacteria. These multiprotein appendages are assembled through a highly ...

Gram staining was developed in the 1800s as a quick and simple procedure to distinguish between Gram positive and Gram negative bacteria. It is one of the first laboratory techniques taught to ...

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.