Adsorption behavior of59Fe and195Au on the non-ionic macro-reticular resin, Amberlite XAD-7 is studied. Distribution coefficients (Kd) for both nuclides in hydrochloric acid or lithium chloride solutions above 6M are particularly high. In nitric acid solution below 2M, 195Au is highly adsorbed on the resin but59Fe is negligible over any concentrations. This resin did not adsorb other important radionuclides such as54Mn, 60Co, 65Zn, 90Sr, 106Ru, 137Cs and144Ce at all. Based on such peculiar adsorption behavior, application to selective separation and determination of radio and stable iron in sea water was also studied.
In the previous paper, we reported that67Ga was accumulated in abscess and uptake rate of67Ga in abscess increased with time after the injection of67Ga-citrate. The present study was undertaken to elucidate the influence of blood flow on the accumulation of67Ga in abscess. Five days after subcutaneous injection of 0.2 ml of turpentine to the rats, 131I-human serum albumin (HSA) was injected intravenously to the rats. At an appropriate time after the injection (10 min to 6 days), uptake rates of131I-HSA in abscess and normal tissues were measured. Similarly, 51Cr-red blood cells (RBC) were injected intravenously to the above rats and the uptake rates of51Cr-RBC were also measured. One, three, and 24 hours after injection of131I-HSA, the uptake rates of131I-HSA in abscess were 1.32 %dose/g, 1.84 %dose /g, and 0.82 %dose/g, respectively. However, the uptake rates of51Cr-RBC in abscess was very small, and the value was 0.14 %dose/g at 24 hours after the injection. In the case of abscess, blood in the tissue fluid was very little, but the permeability of131I-HSA from the blood vessel in the tissue was much larger than that of normal tissues. From these facts, it was deduced that the accelerated permeability caused the abscess accumulation of67Ga.
The infrared13CO2analyzer was improved to measure the13C abundance in the trace amounts of plant metabolites separated by high performance liquid chromatography (HPLC) . To improve the sensitivity to12C, the range of wavenumber of 2 360 ± 10 cm-1was used for12C determination. Free carbohydrates in corn leaves fed13CO2were separated by HPLC and the13C abundances in sucrose, glucose and fructose were determined by this improved method. The samples containing 10-40, μg of carbon could be successfully analysed.