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A method is described which permits the quantitation of the rate of permeation of 131I through dog dentin, both in vivo and in vitro. The results demonstrate the rapidity of the systemic appearance of substances placed on intact dentin. Comparison of the rate of permeation of 131I made in vivo and in vitro, on the same teeth, indicates the rates are very similar.

Peter wurde am 21. Dezember 1927 in Zürich geboren und ist in Zollikon aufgewachsen. Seine Eltern waren Dr. Friedrich Braun, Chefarzt der Schweizerischen Anstalt für Epilepsie in Zürich, und Frau Ida Hofer-Braun.

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