Gram positive

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The thick layer of peptidoglycan enables the cell wall retain the purple colour of crystal violet upon constriction consequent upon treatment with iodine. Thus Gram-positive bacterial cell walls stain pruple.  
 
The thick layer of peptidoglycan enables the cell wall retain the purple colour of crystal violet upon constriction consequent upon treatment with iodine. Thus Gram-positive bacterial cell walls stain pruple.  
  
Examples of Gram-positive bacteria include Staphylococcus aureus, Streptococcus pyogenes and Streptococcus pneumonia amongst others<references />.
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Examples of Gram-positive bacteria include Staphylococcus aureus, Streptococcus pyogenes and Streptococcus pneumonia amongst others.<ref name="Kaiser, G.">Kaiser, G. (2012) The Prokaryotic Cell: Bacteria.  http://faculty.ccbcmd.edu/courses/bio141/lecguide/unit1/prostruct/gpcw.html. The Community College of Baltimore County.</ref>

Revision as of 01:37, 25 October 2012

 The Gram-positive bacterial cell wall is one of the two types of bacterial cell walls the other being Gram-negative cell walls. The Gram-positive cell walls are mainly composed of peptidoglycan although they also consist of surface proteins, teichoic and lipoteichoic acids the latter of which connects the cell wall to the cell membrane. The teichoic and lipoteichoic acids contribute to the positive charge of the bacterial cell surface and they are glycerophosphate or ribitol phosphate- containing acidic polysaccharides. 

The thick layer of peptidoglycan enables the cell wall retain the purple colour of crystal violet upon constriction consequent upon treatment with iodine. Thus Gram-positive bacterial cell walls stain pruple.

Examples of Gram-positive bacteria include Staphylococcus aureus, Streptococcus pyogenes and Streptococcus pneumonia amongst others.[1]


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