Studying and Measuring cells
- Created by: Elly3014
- Created on: 29-12-13 14:10
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- Studying and Measuring cells
- Resolution
- 'the ability to see detail'
- = image / actual size
- 1mm = 1000 um (micro)
- Magnification
- 'the ratio between the size of an object and its image'
- = image / actual size
- 1mm = 1000 um (micro)
- Staining
- most biological material is transparent
- iodine - starch -black
- methylene blue - nuclei - blue
- TEM-uses electron dense material - salts of metal
- SEM-use heavy metals to cover object
- Microscopy
- Electron Microscopes
- SEM - used to image surfaces - 3D imaging
- TEM - give images of the internal structure
- non-living samples only
- High magnification and resolution, but not in colour
- Light Microscopes
- Can use living samples
- Observe Mitosis
- Low resolution and magnification
- Can use living samples
- Electron Microscopes
- Resolution
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