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To heighten the contrast between viruses and the background, use is made of electron-dense "stains". These are usually compounds of heavy metals of high atomic number, that serve to scatter the electrons from regions covered with the stain. If virus particles are coated with stain (positive staining), fine detail may be obscured. Negative staining overcomes this problem by staining the background and leaving the virus relatively untouched. The negative stain is moulded round the virus particle, outlining its structure, and is also able to penetrate between small surface projections and to delineate them. If there are cavities within the virus particle that are accessible to the stain, these will be revealed and some of the internal structure of the virus may be disclosed.
Wiki User
∙ 15y ago
Wiki User
∙ 11y agoA negative stain is a stain that colorizes the area surrounding the cells you are trying to look at. If you dont use a stain to stain the cells, they will appear colorless.
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Is uranyl acetate a negative stain?
Yes, uranyl acetate is used as a negative stain in electron microscopy.
What kind of stain would you use to visualize Sars?
Negative stain
What color is Gram- stain?
Gram- negative bacteria turns red to pink after the gram stain is performed.
What is the gram stain of enterobacter cloacae?
Negative
What color are gram negative cells?
Gram positive bacterial stain purple. They do not take up the counter stain.
What is the gram stain for cholera?
Gram Negative
Is uranyl acetate a negative stain?
Yes, uranyl acetate is used as a negative stain in electron microscopy.
Carbolfuchsin can be used as a simple stain and as a negative stain as a simple stain the pH is?
8
Is HIV gram stain positive or negative?
The answer to whether HIV gram-stain positive or negative is that HIV gram-stain is negative. They retain the light red or pink color after the stain.
What kind of stain would you use to visualize Sars?
Negative stain
Why is the technique called negative staining?
Because the cell wall repels the binding of the negative stain therefore the cells do not stain. Because of this the background is stain with the dye used and the bacteria remain colorless. Basically your staining the background, that is, you are not directly staining the cells.
Why is the size more accurate in a negative stain than a simple stain?
since you do not heat fix the slide when you use a negative stain the cells do not shrink or become distorted
What does a negative result for a spore stain indicate about the organism?
A negative result for the spores stain indicate that the gram-negative organism is present. A positive result for a spore stain indicates that a gram positive organism is present.
What color is Gram- stain?
Gram- negative bacteria turns red to pink after the gram stain is performed.
What Gram stain is acetobacter?
Gram negative
What is shigella dysenteriae gram stain?
Negative
What is the gram stain of enterobacter cloacae?
Negative
