Abundant amyloid is produced by tumor cells (Inset: Congo red stain for amyloid) (E). Original magnification: A, B, C, E 100x, and D 40x. Fine-needle aspiration biopsy (FNAB) of the cold thyroid ...

and one way they can be visualized is with the negative stain. However, negative staining does not differentiate bacteria, one can only determine morphology. 1. Using a flamed inoculating loop, place ...

These dyes directly bind to and stain the negatively charged surface of bacterial cells. Negative, anionic, or acidic dyes: contain functional groups that have a negative charge. Examples include ...