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6 Cards in this Set
- Front
- Back
What is Negative Staining ?
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Negative stain (definition) – does not stain bacteria but colors the background instead.
background = dark bacteria = clear |
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The only staining procedure in which neither heat fixing nor strong chemicals are used is ______________________?
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Negative Staining.
Since there is no heat fixation-the morphology of bacteria is not altered |
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Negative stains include _____________________?
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Negative stains include:
(1) Nigrosin (2) india ink (3) congo. |
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Why are bacterial cells not stained with this dye?
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Bacteria stained with negative staining that also have the same negative charge REPEL the dye, and maintain a clear appearance.
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What is the purpose of negative staining?
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FUNCTION:
(1) provides a background to view bacteria. PURPOSE: (2) ****It can be used for the identification of certain bacteria (spirochetes) or structures (bacterial capsules), spores and difficult to stain bacteria. |
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Name two important diseases caused by spirochetes?
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(1) Syphillis
(2) Lyme Disease |