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  1. Hace 9 horas · A TEM image of a cluster of poliovirus.The polio virus is 30 nm in diameter. Operating principle of a transmission electron microscope. Transmission electron microscopy (TEM) is a microscopy technique in which a beam of electrons is transmitted through a specimen to form an image. The specimen is most often an ultrathin section less than 100 nm thick or a suspension on a grid.