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What is another example of a acidic dye besides Congo red?

Nigrosin


Which of the following is an example of an acidic stain?

Basic dyes: Crystal violet, Methylene blue, Malachite green, Safranin. Acidic dyes: Nigrosin, Congo red


Why does nigrosin not stain bacterial cells?

Nigrosin is an acidic stain composed of large molecules that are repelled by the negatively charged bacterial cell surface. Bacterial cells typically have a negative charge due to components like lipopolysaccharides in their cell walls, which repel the negatively charged nigrosin dye, preventing it from staining the cells.


How does Nigrosin work?

Nigrosin is a negatively charged acidic dye that is commonly used in staining techniques in microbiology and histology. It works by binding to positively charged structures in cells, such as nucleic acids, giving them a dark coloration which aids in visualization under a microscope.


Is onion acidic or basic?

acidic.


Is sour patch kids acidic or basic?

basic or acidic


Is tamarind acidic or basic?

Acidic


Is Buttermilk acidic or basic?

Acidic


Is jasmine acidic or basic?

its acidic


Are figs acidic or basic?

acidic


Why cant methylene blue be used in place of nigrosin in negative staining?

Because negative staining requires the use of an acidic stain, which will not penetrate the cells because of the negative charge on the surface of the bacteria. As a result, the unstained cells can be easily identified against the colored background.


What does acidic basic mean?

Acidic: pH < 7 Basic : pH > 7