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Chapter 3 Terms
na
20
Microbiology
Undergraduate 1
01/29/2012

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Cards

Term
how many centimeters are in a meter?
Definition
100
Term
how many millimeters are in a meter?
Definition
1000
Term
how many micrometers are in a meter?
Definition
1,000,000
Term
microscope parts
ocular
Definition
eyepiece that one looks into
Term
microscope parts
nosepiece
Definition
holds the objectives
Term
microscope parts
objective lenses
Definition
magnifies the image
Term
microscope parts
iris diaphragm
Definition
changes the intensity and size of light passing into specimen
Term
microscope parts
condenser
Definition
focuses the light into the specimen
Term
microscope parts
illuminator
Definition
steady light source
Term
microscope parts
focus knobs
Definition
move lenses closer and further from specimen
Term
microscope parts
stage
Definition
where you place the slides
Term
[image]
Definition
Term
brightfield illumination
Definition
dark objects are visible against a bright background, light reflected off specimen doesn't enter objective lens
Term
darkfield illumination
Definition
light objects are visible against a dark background, light reflected off the specimen enters the objective lens
Term
phase-contrast microscopy
Definition
accentuates diffraction of the light that passes through a specimen
Term
fluorescence microscopy
Definition
uses UV light, fluorescent substances absorb UV light and emit visible light, cells may be stained with fluorescent dyes
Term
electron microscopy
Definition
uses electrons instead of light, shorter wavelength of electrons gives greater resolution
Term
transmission electron microscopy
Definition
ultrthin sections of specimens, light passes through specimen than an electromagnetic lens, to a screen or film, specimens may be stained with heavy metal salts
Term
scanning electron microscopy
Definition
electron gun produces a beam of electrons that scans the surface of a while specimen, secondary electrons emitted from the specimen produce the image
Term
scanning-probe microscopy
Definition
uses metal probe to scan specimen, produces 3D images
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