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Microscopes, Electron, Transmission

Definition : Electron microscopes designed to operate like light microscopes, except that that they use an electron beam instead of light to magnify an image, allowing greater magnification and resolution than a light microscope. Transmission electron microscopes (TEMs) consist of an electron gun and vacuum chamber, an electromagnetic condenser and imaging electromagnetic (lens) systems, a specimen chamber, a viewing chamber and fluorescent screen, and photographic and vacuum systems. Before observation, tissue samples must be fixed, processed, embedded, sectioned, mounted on a support stub, and usually coated (e.g., using a sputter coater) with a thin film of a heavy metal (e.g., gold). TEMs allow highly detailed (e.g., 500,000x magnification) visualization of tissue, individual cells, and cell structures; they are frequently used to identify types of microorganisms (viruses and bacteria) in medical specimens, as well as specific cell types in biopsy samples.

Entry Terms : "TEMs" , "Transmission Electron Microscopes"

UMDC code : 18090

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FEI is the world leader in the production and distribution of electron microscopes, including scanning electron microscopes (SEM), transmission electron microscopes (TEM), DualBeam­ instruments, and focused ion beam tools (FIB), for nanoscale research, serving a broad range of customers worldwide. Nanotechnology is the science of finding, characterizing, analyzing and fabri­cating materials smaller than 100 nano­meters (a nanometer is one billionth of a meter). FEI's global customer base includes researchers, scientists, engineers, lab managers, and other skilled professionals.

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