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Electron Microscope (Transmission Electron microscope (Thin specimen -->…
Electron Microscope
Transmission Electron microscope
Thin specimen --> less electrons
Thick specimen --> more electrons
For nonliving specimen
Magnifies up to 500,00x
Transmitted to specimen and display the image to a fluorescent screen
Scanning Tunneling Electron Microscope
Involves bringing the charged tip of a probe extremely close to the specimen so that the electrons “tunnel” through the small gap between the specimen and the tip.
Can be used with live specimens.
This instrument has enabled scientists to create three-dimensional computer images of objects as small as atoms.
Can be used to observe cell division
Prepared by:
Sara AlSaleh
Reema AlSaliem
Alanoud AlSalman
Scanning electron microscope
Directs electrons over the surface of the specimen producing three-dimensional image
for nonliving specimen
Atomic Force Microscope
Measures various forces between the tip of a probe and the cell surface.