Moisture distribution of a camphor tree was presented. A 23 year old camphor tree was downed at university forest and a wood dish, about 1 cm in width, was lumbered out from the breast height of the tree. The wood disk as well as a newly developing branch of the tree were irradiated with thermal neutrons at an atomic reactor installed at Japan Atomic Energy Research Institute. The total flux of thermal neutron was 3.0×109n/cm2.Water specific images of the disk and a branch were presented with high resolution, which was estimated to be about 16μm.In the case of wood disk, moisture decreasing manner while drying was also shown through neutron image. Neutron images showed that the moisture decreasing rate in sapwood was similar to that of heartwood.
Changes in regional cerebral blood flow (rCBF) were studied using99mTc-ECD SPECT and Patlak method in 47 subjects, aged 1 to 79 years (mean 28.5 years) . No abnormal finding was found on MR imaging in the subjects. We obtained mean cerebral blood flow (mCBF) by means of Patlak method. rCBF was measured by positioning regions of interest (ROIs) in frontal lobe, parietal lobe, temporal lobe, occipital lobe, cerebellum and thalamus. The correlation coefficient between ages and mCBF was r=-0.897 (p<0.0001) . mCBF of children was significantly higher (p<0.05), compared with adults. By dispersion analysis according to the groups of ages, significantly higher rCBF values were available in the frontal, parietal, temporal and occipital lobes during childhood than adulthood (p<0.05), but there were almost no significant differences of rCBF during childhood than adulthood in cerebellum and thalamus.
The effect of gamma irradiation on the growth rate, on the amount of soluble protein and on the amount of DNA in tobacco calli was analyzed. A significant decrease in the amount of DNA was detected in the calli of every growth stage after incubation for 24hfollowing irradiation at a dose that severely affected the growth of calli, although only a slight change was detected in the amount of soluble protein. No difference in the effect of irradiation on protein and DNA contents was detected among calli of different growth stages, although the amounts of protein and DNA in calli in each growth stage were different. The extent of the decrease in the amount of DNA of calli depended on both the dose which ranged from 0-300Gyand the time of incubation after irradiation. These results suggest that the rapid decrease in the DNA content of calli after irradiation is due to cellular systems that are induced by irradiation and that result in enzymatic degradation of DNA.
We evaluated the safety and clinical usefulness of cerebral and myocardial blood flow measurement by means of positron emission tomography (PET) with automated synthesis system of [15O] H2O (ARIS-02, JSW) in 62 patients with either brain disorder (n=31) or cardiac disease (n=31) . In all 62 patients, no side effects were detected after administering [15O] H2Ointravenously. The quality of the PET images were“fairly good”or“good”in all the cases. When compared with other imaging modalities such as computed tomography, this method provided physiological and functional information on the brain and cardiac diseases. We concluded that the PET measurement of cerebral and myocardial blood flow using automated synthesis system of [15O] H2Ois clinically useful.