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Notes COMMON STAINING TECHNIQUE

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MICROBIOLOGYMODULECommon STAINING TechniqueMicrobiology 20Notes2COMMON INTRODUCTIONStaining is TECHNIQUE used in microscopy to enhance contrast in the microscopicimage. Stains and dyes are frequently used in biological tissues for viewing,often with the aid of different microscopes. Stains may be used to define andexamine bulk tissues (highlighting, for example, muscle fibers or connectivetissue), cell populations (classifying different blood cells, for instance), ororganelles within individual have nearly the same refractive index as water, therefore, when theyare observed under a microscope they are opaque or nearly invisible to the nakedeye. Different types of STAINING methods are used to make the cells and theirinternal structures more visible under the light are of little use unless the specimens for viewing are preparedproperly.

violet stain because of the high amount of peptidoglycan in the cell wall. Gram-positive cell walls typically lack the outer membrane found in Gram-negative bacteria. Gram-negative bacteria are those bacteria that do not retain crystal violet dye in the Gram staining protocol. In a Gram stain test, a counter stain (commonly

  Protocol, Saint, Gram, Gram stain

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