Sputum Gram Stain: Purpose, Procedure & Results Medically reviewed by Graham Rogers, M.D. — Written by Sandy Calhoun Rice — Updated on July 9, 2017 Purpose ...

THE common methods for differential staining of lignified plant tissue are specific when used correctly, but minor errors in procedure may lead to unsatisfactory results. The following simple ...

Credit: Katryna Kon/Shutterstock.com. Gram staining was developed in the 1800s as a quick and simple procedure to distinguish between Gram positive and Gram negative bacteria.