Why they are called Gram Negative Bacteria?
Gram-Negative Bacteria (Pseudomonas Aeruginosa) are simply called so because of their detection by the Grams Stain test in which they do not retain the crystal violet color (dye) in their cell wall. The Gram-Negative bacteria cell-wall holds the pink or reddish dye once a counterstain chemical is used. Cell-wall Structure of Gram-Negative Bacteria: The outer layer of Gram Negative bacteria cell-wall is made up of Lypopolysaccharide and Protein (core and O-polysaccharide and Lipid A) and it covers a very few thinner layers of Peptidoglycan as compared to Gram Positive bacteria (Peptidoglycan forms the outer layer of the Gram Positive bacteria cell-wall) and does not contain lipoproteins. The outer layer of the cell wall contains porins (pore like structure for a specific type of molecule). Below the outer layer of Lypopolysaccharide, there exist layers of peri-plasmic space (space between two layers of peptidoglycan and internal cell membrane) and plasma membrane. Some Gram Negative bac
