electron microscopes and cell details

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Transmission electron microscopes (TEM)

-The electron BEAM passes through a very THIN PREPARED SAMPLE.

-Electrons pass through the DENSER parts of the sample LESS EASILY, so giving some contrast.

-The final image produced is 2D (two dimensional).

-The magnification possible is x500 000.

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Scanning electron microscope (SEM)

-The electron beam is directed onto a SAMPLE. 

-The electrons DON'T pass through the specimen.

-They are 'BOUNCED OFF' the sample.

-The final image produced is 3D (three dimensional).

-The magnification possible is x100 000.

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