Differentiate gram negative and gram positive flagellar structure
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Gram-positive bacteria do not have an outer cell membrane found in Gram-negative bacteria. The cell wall ofGram-positive bacteria is high in peptidoglycan which is responsible for retaining the crystal violet dye.
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The scientist who defined gram positive and gram negative bacteria : CHRISTIN GRAM.
GRAM POSITIVE BACTERIA:
Cell wall made up of peptidoglycan+teichoic acid.
Stain remain persistant.
Cell wall single layered.
Thickness of cell wall= 20-80 nm.
Teichoic acid present. It provides stability to the plasma membrane.
Only 2 rings in flagella present — S and M.
Very low lipid content.
Less bacteria are pathogenic.
GRAM NEGATIVE BACTERIA:
Cell wall made up of peptidoglycan.
Statin removes because stain is soluble in water and insoluble in lipid.
An additional layer of glycolipid is present in the cell wall.
Thickness = 8-12 nm.
Teichoic acid absent.
All 4 rings in flagella present — L,P,S and M.
High lipid content.
Most bacteria are pathogenic.
GRAM POSITIVE BACTERIA:
Cell wall made up of peptidoglycan+teichoic acid.
Stain remain persistant.
Cell wall single layered.
Thickness of cell wall= 20-80 nm.
Teichoic acid present. It provides stability to the plasma membrane.
Only 2 rings in flagella present — S and M.
Very low lipid content.
Less bacteria are pathogenic.
GRAM NEGATIVE BACTERIA:
Cell wall made up of peptidoglycan.
Statin removes because stain is soluble in water and insoluble in lipid.
An additional layer of glycolipid is present in the cell wall.
Thickness = 8-12 nm.
Teichoic acid absent.
All 4 rings in flagella present — L,P,S and M.
High lipid content.
Most bacteria are pathogenic.
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