BACTERIAL CLASSIFICATION THE CELL WALL by zqa20601

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									BACTERIAL CLASSIFICATION: THE CELL WALL

IMPORTANT BOTH IN DISEASE AND IMMUNITY

THREE TYPES OF CELL WALL:

GRAM STAIN (IODINE/CRYSTAL VIOLET)
DIFFERENTIATES BETWEEN

1) GRAM POSITIVE- THICK PEPTIDOGLYCAN
   LAYER OUTSIDE A SINGLE CELL
   MEMBRANE

And

2) GRAM NEGATIVE- THIN PEPTIDOGLYCAN
   LAYER BETWEEN TWO CELL MEMBRANES.

   THE ZIEHL-NEELSEN OR ZN STAIN (FUCHSIN
   BASED) IS USED FOR THE THIRD TYPE OF
   CELL WALL

3) WAXY MYCOLIC ACIDS OF MYCOBACTERIA
   THAT RESIST DESICCATION AND ALLOW THE
   ORGANISM TO SURVIVE IN DRY CONDITIONS.

OTHER CELL WALL FEATURES:
FLAGELLA      FOR MOTILITY

PILI          ATTACHMENT TO HOST CELL

								
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