3. Structure of bacterial cell

14. Cell wall
Gram(+) cell wall
Gram(-) cell wall
 thick peptidoglycane
 thin peptidoglycane
 no teichoic acids
 teichoic acid, lipoteichoic acid
 outer membrane - .molecular screen.
 integral proteins
 polysaccharides
 Porins
 permeases,
 translocation proteins
 protein receptors
 lipopolysaccharide LPS =
endotoxin (negative charge,
hydrophobic, anti-phagocytotic, toxic)
 lipid A
 core polysaccharides
 O-antigen

16. Gram stain method

20. Cell wall:
Peptidoglycane or murein
network-like polymere
surrounds the cell like net bag
many layers
very rigid
Gram(+): lysozyme may break protoplast
Gram(-): penicillin may break spheroplast
L-form

35. Flagella
-for motility
long spiral protein chains-flagellin

36. Position Of flagella

40. Pili
- for attachment;
- for changing of
DNA between
bacteria (sex of
bacteria).