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    Electrons see the light

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    Biological Sciences Tutorial: CryoEM with Phase Plates

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    Nagayama K. Transmission electron microscopy with Zernike phase plate. Ultramicroscopy. 2001; 88:243–52. [PubMed: 11545320

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    Abstract The possibility of implementing a Zernike phase plate in a transmission electron microscope is investigated both theoretically and experimentally. The phase-retarding plate in the form of thin film with a hole in the center is positioned in the back-focal plane of the objective lens. The experiments show that the phase plate functions as predicted, producing a cosine-type phase contrast transfer function. Images of negatively stained horse spleen ferritin were highly improved in the contrast and the image-modulation, compared to those acquired without the phase plate. Charging and related difficulties were encountered during the phase plate experiments. In order to make the technique user-friendly a number of improvements have to be made, and are discussed in terms of the current level of technology and instrumentation.
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