Fig. 2
From: Bioengineered materials with selective antimicrobial toxicity in biomedicine
The membrane structure of Gram-negative bacterium (a), Gram-positive bacterium (b) and fungus (c). The cell membranes of both types of bacteria are similar. The Gram-positive bacterium has a thick peptidoglycan layer surrounding the cell membrane. In contrast, the peptidoglycan layer in Gram-negative bacterium is thinner with an additional outer membrane. Fungus cells have an outer cell wall comprising chitin, β-glucan, and mannoproteins