Unit 1 biology microscopes

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What are TEMS?
Transmission electron microscopes
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What are SEMS?
Scanning electron microscopes
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How do TEMS work?
Focus a beam of electrons with electromagnets, transmitting through an organism
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How do SEMS work?
Scan a beam of electrons across an organism
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Advantages of TEMS?
High magnification of 150,000 and a high resolution of 0.0001 um. Denser parts absorb more, which means they end up darker on the image, so you can see it clearer. you can record the image onto a photograph.
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Disadvantages to TEMS?
Can only see it in a vacuum, so you can't see living organisms. Can only see the inner structure, not the outer 3D structure, can only be used on thin specimins.
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Advantages of SEMS?
Can use thick organisms, You can see the outer 3D structure as well as inner.
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Disadvantages of SEMS?
Lower magnification of 1500. And lower resolution of 0.2 um. Still can only see it in a vacum.
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Card 2

Front

What are SEMS?

Back

Scanning electron microscopes

Card 3

Front

How do TEMS work?

Back

Preview of the front of card 3

Card 4

Front

How do SEMS work?

Back

Preview of the front of card 4

Card 5

Front

Advantages of TEMS?

Back

Preview of the front of card 5
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