Microbiology

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  Thời Gian Còn Lại


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Main difference between gram positive and gram negative bacteria

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Bacteria have 3 main forms- cocci:

shaped,

- rod shaped and spirilli- spiral shaped.

The gram stain is a method used to distinguish different types of bacteria. It distinguishes between two different types of

Bacteria are stained with a violet dye and iodine, rinsed in alcohol and then stained with a red dye. In Gram-positive bacteria, the peptidoglycan in the cell wall

the dye causing the stain to be

Gram-negative don't take up the dye because there is an

that resists the dye. The cells of the gram-negative only absorb the counter-dye making them appear

After the gram stain, the bacteria may be identified using a variety of techniques- culture and microscopy, biochemical and serological tests, DNA techniques



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