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Frederik, P.M.

( P.M. Frederik)


tissue testi autoradiography steroid section perfusion testosterone localization electron freeze study teste seminiferous tubules grain method amb-doc technique grain densities autoradiographic rat testis buffer diffusible substances hamb-doc density van der molen leydig cells frederik paper seminiferou result leydig stumpf pregnenolone sample tubules tritiated substance vapour electron microscope level fixation water androgen microscope appendix cytoplasm oestradiol procedure diffusible klepper specimen albicans sertoli cells sertoli temperature experiment microscopy electron microscopy hcamb-doc digitonin table radioactivity molen compound press crystal autoradiographic localization level embedding rat testes treatment light osmium tetroxide vapour tissue samples osmium derivate resolution layer ice crystals structure medium