BIOLOGY AS Unit 1
- Created by: Sally
- Created on: 23-11-12 18:43
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- Unit 1: AS CELLS, EXCHANGE AND TRANSPORT
- CELLS
- MICROSCOPES
- Light Microscope:
- Electron Microscope
- Advantages
- Scanning Electron Microscope
- Can produce a 3D images of the cells- which can reveal the detail of tissue arrangements.
- The magnification possible is x100,000
- Resolution: 0.5 nm
- Works by bouncing electron beams off the surface of an object.
- Can produce a 3D images of the cells- which can reveal the detail of tissue arrangements.
- The magnification possible is x100,000
- Resolution: 0.5 nm
- Works by bouncing electron beams off the surface of an object.
- Works by bouncing electron beams off the surface of an object.
- Resolution: 0.5 nm
- The magnification possible is x100,000
- Can produce a 3D images of the cells- which can reveal the detail of tissue arrangements.
- Works by bouncing electron beams off the surface of an object.
- Resolution: 0.5 nm
- The magnification possible is x100,000
- Can produce a 3D images of the cells- which can reveal the detail of tissue arrangements.
- Transmission Electron Microscope.
- Resolution: 0.1 nm
- The electron passes through a very dense prepared sample.
- Electrons pass through the denser parts of the sample less easily so it gives it more contrast.
- Transmission Electron Microscope.
- Resolution: 0.1 nm
- The electron passes through a very dense prepared sample.
- Electrons pass through the denser parts of the sample less easily so it gives it more contrast.
- Electrons pass through the denser parts of the sample less easily so it gives it more contrast.
- Magnification: x500,000
- Transmission Electron Microscope.
- Electrons pass through the denser parts of the sample less easily so it gives it more contrast.
- Magnification: x500,000
- The resolution is O.1 nm (2000x more than the light microscope.)
- The microscope can therefore produce detailed pictures of the structures and organelles within the cell.
- Advantages
- Scanning Electron Microscope
- The resolution is O.1 nm (2000x more than the light microscope.)
- The microscope can therefore produce detailed pictures of the structures and organelles within the cell.
- The microscope can therefore produce detailed pictures of the structures and organelles within the cell.
- Scanning Electron Microscope
- Advantages
- The microscope can therefore produce detailed pictures of the structures and organelles within the cell.
- Scanning Electron Microscope
- Limitations
- Transmission Electron Microscope
- The image produced is two-dimensional 2D.
- Scanning Electron Microscopes
- Electron microscopes are very expensive.
- Transmission Electron Microscope
- The image produced is two-dimensional 2D.
- Transmission Electron Microscope
- Electron microscopes are very expensive.
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- Preparing samples and using an electron microscope both requires a high degree of skills and traiing.
- Transmission Electron Microscope
- Advantages
- MAGNIFICATION
- MICROSCOPES
- CELLS
- Scanning Electron Microscopes
- Electron microscopes are very expensive.
- Electron microscopes are very expensive.
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