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An essay on Electron Microscopy An electron microscope (EM) shows the essential features of a cell. This uses an electron stream which is directed at the specimen. This invention was built in the 1930's. The transmission electron microscope (TEM) has extremely high magnification and resolution properties. The reason why biologists need a high resolution is in able to see the specimen in more detail. Feature Electron microscope Wavelength Electron beam - 1.0 nm Resolution 0.5 nm Maximum useful magnification X 250 000 Image Black and white - colour enhanced By computer Specimens Non-living Advantages Very high resolution- can see Plenty of cell detail Focused by Magnets Illumination Electrons The way an image is formed on a electron microscope (EM) is by the electrons in an electron microscope (EM) are focused. Here the particles or the membranes in cells can be seen as separate objects if they are further apart than half of the wavelength of the beam of the electrons used. Electron...

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