Calcium and radiostrontium-contents in food-materials produced during 1955 to 57 were determined. In many kinds of food-materials produced on land such as cereals, vegetables, and milk etc., Sr90-content was found to attain more than20Sr U, while, in those in marine as seaweeds and dry fishes, this was so small that it was barely recognized.
From the dietary survey of 50 families of Hachijo Island's inhabitants, it is observed that the diets of these are greatly unbalanced on its nutrients composition, the comsumption of foods of animal source, vegetables, and fruits was low, and so the intake of animal protein, inorganic substances, and vitamins was found to be difinitely low.
From the physical inspection with 263 residents of Hachijo Island, it would be concluded that the incident ratio of Anemia, Hyperkeratosis, Galt Tenderness, Angular Stomatitis, Edema was almost the same as that obtained with the other districts of Tokyo, while some showed abnormal rate of pulses. It was also observed that minimum blood pressure was lower than that of normal one and the incidence of missed and decayed teeth was abnormally high.
Blood samples were collected from 76 Hachijo's inhabitants and the specific gravity and the contents of its inorganic and organic components, namlly, total serum calcium, inorganic phosphate, serum protein, albumin, and globulin were compared with those of inhabitants dwelling in nutritively improved area (area of Suginami.Nishi Health Centre, Tokyo) and it was found that total calcium and dialyzable calcium of Hachijo's inhabitants were definitely low.
In continuation of the work reported previously1), the extention of storage period of steamed fish paste products by Co-60 gamma irradiation was studied at higher storage temperatures. When vacuum packed baked samples were irradiated, a considerable in crease in storage period was observed. However, the loss of the originalflavor after irradiation and a change in color on storing occurred, these changes being marked with a large irradiation dose. An early stage of deterioration was detected by turbidmetry, which has been suggested by Tomiyama, et al 4), along with organoleptic observations.
Albino rats weighing 40 to 60 grams were maintained on the following diets: 1, low lysine basal diet containing corn meal 76, wheat gluten 20, sodium chloride 1, calcium carbonate 3, and a vitamin mixture; 2, basal diet plus D-lysine hydrochloride 0.5%; 3, “plus L-lysine hydrochloride 0.5%. 4, ” plus DL-lysine hydrochloride 1.0%. The samples of lysine used here were synthetic products derived from r-caprolactam. The addition of L-lysine stimulated the growth, and of DL-lysine in somewhat less extent. Some of the animals in the D-lysine group were dead after sudeen less of weight, but it could not be attributed to the deleterious effect of the D-compound. Feeding of DL-lysine over long period caused slight pathological changes in liver and kidney.
The changes in the amounts of mineral elements in the walls of the stomach and large intertine of the rachitic animals by this desease were not brought to be clear as those in the bone and liver. However, the amounts of sodium and potassium in the stomach wall of the rachitic animals were, without exception, significantly larger than those of the controlled animals, and the similar tendency was observed concerning those in the wall of large intestine. Also, the calcium content in the walls of the two organs showed always the same tendency as Na and K.
The amounts of calcium and phosphorus in the muscle of the rachitic animals were smaller, compared with those of the controlled animals, and the amounts of sodium, iron, and copper of the mal-nutritive rachitic animals and of potassium of the normal nutritive rachitic animals were larger than those of the controlled animals on the contrary to the cases of calcium and phosphorus. The amounts of calcium, phosphorus and sodium in the spleen showed always larger amounts in the rachitic rats and rabbits than in the controlled animals, and high copper content was observed in this organ of rachitic rats and high potassium and iron in rabbits.
The calcium amount in the heart and cerebrum of the rachitic animals was smaller than that of the controlled animals, and as to the phosphorus content, the same trend as calcium was observed expect the mal-nutritive rachitic animals. The amounts of iron and copper in the lung and cerebrum of the rachitic animals were slightly larger, compared with those of the controlled animals. However, the amounts of sodium and potassium in the heart of the mal-nutritive rachitic animals were considerably larger than those of the controlled animals. But, the potassium content of the rabbits was only smaller than that of the controlled animals.