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Chapter 3 vocabulary


Dark-field microscopy light coming directly through specimen is blocked out, so that the light reflected off the bacteria is seen. Makes structures appear against a black background and seem bigger than they really are.
Differential stain differentiates between 2 common types of bacteria
Electron microscopy viruses are stained with a heavy metal and electrons are shined on them--electrons are more powerful than photons--can resolve down to 0.002 microns, to show even the tiniest of virus particles.
Medium a nutritious extract or mixture of materials that will support the growth of microbes.
scanning electron microscopy scattered electrons are detected and the object's surface is reconstructed by computer technology.--good for visualizing surface structures--resolves to about 0.02 microns
Staining dye added to the organisms to improve contrast and our ability to recognize the microbes--stained bacteria have a more apparent shape.
Transmission electron microscopy the electrons pass through the specimen. Heavy metals pile up around the virus and scatter electrons. This leaves dark areas that reflect the viral outline on the veiwing screen.
Created by: heatherlvn