Gram positive

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The Gram-positive [[bacteria|bacterial]] [[cell wall|cell wall]] is one of the two types of bacterial cell walls the other being [[Gram_negative|Gram-negative]] cell walls. The Gram-positive cell walls are mainly composed of [[peptidoglycan|peptidoglycan]] although they also consist of surface [[proteins|proteins]], [[teichoic acids|teichoic]] and [[lipoteichoic acid|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|glycerophosphate]] or [[ribitol phosphate|ribitol phosphate]]- containing acidic polysaccharides.   
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The Gram-positive [[Bacteria|bacterial]] [[Cell wall|cell wall]] is one of the two types of bacterial cell walls the other being [[Gram negative|Gram-negative]] cell walls. The Gram-positive cell walls are mainly composed of [[Peptidoglycan|peptidoglycan]] although they also consist of surface [[Proteins|proteins]], [[Teichoic acids|teichoic]] and [[Lipoteichoic acid|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|glycerophosphate]] or [[Ribitol phosphate|ribitol phosphate]]- containing acidic polysaccharides.   
  
The thick layer of peptidoglycan enables the cell wall retain the purple colour of [[crystal violet|crystal violet]] upon constriction consequent upon treatment with [[iodine|iodine]]. Thus Gram-positive bacterial cell walls stain pruple.  
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The thick layer of peptidoglycan enables the cell wall retain the purple colour of [[Crystal violet|crystal violet]] upon constriction consequent upon treatment with [[Iodine|iodine]]. Thus Gram-positive bacterial cell walls stain purple.  
  
Examples of Gram-positive bacteria include ''[[Staphylococcus aureus|Staphylococcus aureus]]'', ''[[Streptococcus pyogenes|Streptococcus pyogenes]]'' and [[Streptococcus pneumonia|''Streptococcus pneumonia'']] amongst others&nbsp;<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>.
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Examples of Gram-positive bacteria include ''[[Staphylococcus aureus|Staphylococcus aureus]]'', ''[[Streptococcus pyogenes|Streptococcus pyogenes]]'' and [[Streptococcus pneumonia|''Streptococcus pneumonia'']] amongst others&nbsp;<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>.  
  
=== References ===
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=== References ===
  
 
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Revision as of 12:35, 4 December 2015

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 purple.

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

References

  1. Kaiser, G. (2012) The Prokaryotic Cell: Bacteria. http://faculty.ccbcmd.edu/courses/bio141/lecguide/unit1/prostruct/gpcw.html. The Community College of Baltimore County.
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