Objectives In order to stain the bacterial specimen for microscopy one must first prepare the smear on the slide. This basically involves three steps----transferring a liquid suspension of the bacterium on the slide, drying the smear, and then heating slightly to firmly attach the smear to the slide. Once this is done, the staining procedure begins. Note Do NOT make your smear suspensions too thick. The dye will not penetrate well, and there will be far too many bacterial cells to see individual shapes and arrangements. One needs to be careful about thick smears when taking the specimen from an agar medium. RECOMMENDATION: You may find it helpful to draw a circle (wax pencil is best) on the opposite side of the slide where you will spread your smear. This will help you later in locating the smear, sometimes a problem when moving the slide back and forth looking for your bacteria. The wax pencil is better than a marker because it will not wash off easily from the glass. MATERIALS NEEDED
THE PROCEDURES
QUESTIONS
Contributors and Attributions
What are the steps of applying immersion oil in the correct sequence?Illustrate the four stage process of using the oil immersion lens:. Focus very carefully with the 40x objective over the stained specimen on the slide. ... . Rotate turret half way so that the 40x and 100x objectives straddle specimen.. Apply a small drop of oil directly on the slide over the specimen.. What is the oil immersion procedure?In light microscopy, oil immersion is a technique used to increase the resolving power of a microscope. This is achieved by immersing both the objective lens and the specimen in a transparent oil of high refractive index, thereby increasing the numerical aperture of the objective lens.
What are the correct order of steps as you bring an object into focus under high power?Indicate the correct order of steps as you bring an object into focus under high power.. Place slide on stage and secure with stage clips.. Turn on the light and center the specimen over the light source.. Focus specimen on scanning objective using coarse focus adjustment.. |