The SEM has great depth of field, resulting in an image that seems three-dimensional. Scanning electron microscopes (SEMs) are useful for studying surface structures. A TEM aims an electron beam through a thin section of the specimen. Transmission electron microscopes (TEMs) are used mainly to study the internal ultrastructure of cells. Light microscopes do not have as high a resolution, but they can be used to study live cells. However, electron microscopes can only be used on dead cells.
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