Summary: The technique of autoradiography in the electron microscope has been used to determine the site of incorporation of tracer from tritium-labelled glucose, amino acids and bacteria by and the ovine form of . Both protozoa incorporated tracer from glucose principally into protozoal polysaccharide and intracellular bacteria. The results with the bacteria confirmed previous findings that digested rapidly in vesicles in the endoplasm, whereas spp. lysed the bacteria in the medium before incorporation. These products were then taken up both by the protozoa and the bacteria attached to their surface. In the presence of label from tritiated was found principally in the endoplasm, whereas that from glycine was present in the ectoplasm also.


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