In order to elucidate the absorption of uranium to plant materials, uranium and iron were analysed. It was shown that238U content was 2-3 mBq in 100 g of fresh tree leaves and iron was 6-8 mg. Although the concentration of238U varied with plant species; the ratio of238U to iron seemed to be almost constant, ranged from 0.15 to 0.52. The result suggested that238U in plant materials might be absorbed together with iron from soil.
We assessed the usefulness of13C-triolein breath test, for evaluating the disturbances in fat digestion and absorption. Five hundred mg of13C-triolein was orally administered to fasted subjects early in the morning, together with 25g of peanut oil. Expired13CO2was collected over a period of eight hours at intervals of one hour, and13CO2was assayed by mass spectrometry. The 8 hours cumulative13CO2excretion ratio was calculated. In healthy individuals, this mean ratio was 18.0±4.4%. However, it was significantly lower (6.88±5.08, p<0.01) in the patients with intestinal diseases and pancreas resection, who were suspected of having disturbances in fat digestion and absorption. The13CO2excretion ratio correlated inversely with fecal fat content by chemical deters ination. Expired13CO2collection following13C-triolein oral administration provides one of useful and simple methods for assessing the intestinal digestion and absorption of fat.