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Phenidone-ascorbic acid development in electronmicroscopic autoradiography

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Summary

Phenidone-ascorbic acid development was calibrated for electronmicroscopic autoradiography, using Ilford L4 as photographic emulsion and microdol-x as reference developer. Grain yield and efficiency were studied on pale gold sections of uniformly labeled tritium methacrylate. For determination of the resolution, a radioactive line source was prepared by crosssectioning of an epon-embedded film of tritium labeled albumin. The spatial relationship between silver grains and silver bromide crystals was investigated by shadowing the emulsion with platinumcarbon before development. In shadowed autoradiographs both, silver grains and silver bromide crystal were visible.

Phenidone was about twice as sensitive as microdol-x and had a half distance value (Salpeter et al., 1969) of 175 mm. Most of the silver grains of both developers were located within the perimeters of their parent silver bromide crystals. In the case of phenidone more than 80% of the excited crystals gave rise to just one silver deposit. These parameters, together with grain size and shape, and counting feasibility make phenidone a useful developer for quantitative EM-autoradiography.

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  1. Centre for Electron Microscopy, School of Medicine, State University of Utrecht, Nicolaas Beetsstraat 22, Utrecht, The Netherlands

    Harry Heijnen & Hans Geuze

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  1. Harry Heijnen
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  2. Hans Geuze
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Heijnen, H., Geuze, H. Phenidone-ascorbic acid development in electronmicroscopic autoradiography. Histochemistry 54, 39–50 (1977). https://doi.org/10.1007/BF00493327

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  • DOI: https://doi.org/10.1007/BF00493327

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