To ensure that the tissue structures of biological samples are easily recognizable under the electron microscope, they are treated with a staining agent. The standard staining agent for this is uranyl ...

With delicate hues of purple and pink, a lab technique called gram staining has reliably characterized bacteria for more than a century. Yet many scientists are mistaken about why the vivid method ...

Gram positive bacteria and gram negative bacteria are the two basic forms of bacteria. Under a microscope, gram positive bacteria have a violet purple tint after staining. Pneumonia, abscess, MRSA ...