分析による拡散定数の新しい測定装置について

概要

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A new type apparatus for diffusion measurements has been constructed and diffusion constants of several substances have been measured with considerably satisfying results. This apparatus is composed of two upper and lower round metal-blocks which are held together with a center pin. A sharp boundary between solution and solvent can be formed by rotating the upper section which contains solvent relative to the lower section which contains solution. This apparatus is suitable for diffusion measurements on colored substances, turbid solutions, and very dilute solutions, the diffusion constants of which can hardly be measured by the usual optical method. The substances tried were methylene blue (D_<20,w> = 45 × 10^<-7>cm^2/sec at 0.05% and 0.025%), ribonucleic acid from brewers yeast (D_<20,w> = 8.7 × 10^<-7>cm^2/sec at 0.1% and 0.05%), and deoxyribonucleic acid from herring soft roe (D_<20,w> = 1.6, 1.7, and 1.9 × 10^<-7>cm^2/sec at 0.28%, 0.1%, and 0.03% respectively). The data obtained on nucleic acids were quite in agreement with those obtained by the optical method. It must be noteworthy that diffusion constant of substances which have any activity such as bacteriophages, enzymes, or radio-isotope-labeled compounds can be measured without any special considerations on contaminating substances even in very dilute solutions.
宇宙航空研究開発機構の論文
1958-03-27