1. Match: Read about each microscope part. Match the description to the part on the diagram. B Stage: Platform where a slide is placed. Eye piece: Lens at the top of the microscope that the user looks through. This lens most commonly magnifies a sample by 10x. Coarse focus knob: Large knob that moves the stage up and down to focus the sample. Fine focus knob: Small knob that moves the stage over a short distance to refine the focus. Objective lens: A second lens that further magnifies the sample. Microscopes usually have several objective lenses with different magnifications. Slide: A rectangular piece of glass upon which a sample is mounted for viewing under a microscope.
Microscopic examination
The analysis of minute organisms, cellular organization of any biological structure, and composition of body fluids with the help of a microscope is known as microscopic examination. The magnification of specimens or samples under study helps in attaining a clearer picture of it.
Gram Staining
Named after Hans Christian Gram, a Danish bacteriologist, Gram stain is one of the most powerful staining techniques within microbiology. This technique was introduced in 1882 to identify pneumonia-causing organisms. The Gram staining technique uses crystal violet or methylene blue as primary staining colors to distinguish gram-positive from gram-negative organisms. Under a microscope, the gram-positive organisms appear purple-brown, retaining the primary color. Gram-negative organisms appear pink or red as they do not acquire the color of the primary stain.

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