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2. Electron Microscopy
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A. Transmission electron Microscopy (TEM)
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LM vs. TEM
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TEM Fixatives:
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3-D reconstruction of a mitochondrion from TEM sections
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Immunogold localization (TEM)
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Replica technique for surfaces
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TEM of replica of freeze-fractured chloroplast
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TEM of negatively stained actin filaments
(Uranium acetate)
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B. Scanning Electron Microscopy
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SEM DIC TEM
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Radioisotope labeling
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Radioisotopically labeled molecules
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EM Autoradiography Labeled Pancreatic beta Insulin: cells pulsed w 3H-leucine for ’ 5 min, followed grains over by 10’ and 45’ Golgi app. chase. Sections coated w photo emulsion and ’ exposed in dark Grains over Grains secretory developed and granuled photographed in TEM
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