Since heat fixation is not required and cells are not subjected to the distorting effects of chemicals and heat, their natural size and shape can be seen. Also, it makes it possible to view hard to...
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...
When a stain, such as an acid dye, cannot penetrate the outer layers of a microbe, the cell will appear transparent on a colored background. This stain is called a negative or background stain. It is...