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An automatic fluorescence microphotometer using an image dissector tube as the fluorescence detector is described. The image dissector tube is used in the photon-counting mode of operation to allow precise intensity measurements of weak fluorescent spots. With the support of a laboratory-built microcomputer system, the instrument can automatically search for cells stained with fluorescent dye in the microscope field; then the detected cells are individually put in the measuring probe region to have their fluorescence intensities measured. Finally a fluorescence distribution histogram of stained cells is automatically generated and graphically presented. The instrument also allows a fluorescence intensity mapping operation utilizing the conventional raster scanning technique. To demonstrate the system's performance, DNA in rat liver nuclei stained with Feulgen dye was measured.
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Wungkobkiat et al. (1979) studied this question.
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