The aim of the present investigation was to study the effect of varying calcium intake on the absorption, excretion and skeletal metabolism of Ca45 in young rats. A litter of five growing albino rats ware divided into two groups, and one was fed with the standard diet (calcium content 0.47%) and the other with diet poor in calcium (0.15%). After one month feeding they were given about 7μc isotope calcium by oral administration. After the collection of urine and feces separately, on the 5th day of the experimental period, the animals were sacrificesd and various organs were taken out. Making ash of these samples, the isotope calcium was measured by Geiger-Müller counting tube. From the findings of this experiment it seems justifiable to draw the conclusion that the degree of calcium “saturation” has an effect on the efficiency of calcium utilization. The efficiecy is greater with depleted than with replenished store.
The lower basal metabolism of Japanese after great War II was reported by the authors two years ago. This report gives an account of its recovery process. The basal metabolism of oursllves have been measured monthly after the August of 1949, when both two subjects showed 30 Cals, per square meter Per hour that was about 13% lower than the Japanese standard. This lower value continued until the August of 1950, after that it raised gradually and reached the standard value in the winter, It is particularly important that this recovery of basal metabolism began nearly 1.5-2.0 years later than the recovery of their food intake to the nutritional allowance. We conceive, the undernutrition caused by food deficient through several years long needs long period, in this case more than one and a half year, to get the normal nutritional status.
We are used phenol-α-glucoside and p nitrophenol-β-galactoside for the colorimetric determination by the electric method and destribution in coli group organisms of α-glucosidase, β-galactosidase are described. The carbohydrate metabolism of coli group organisms shows that α-glucosidase, β-galactosidase an integral part of thier determination.
1. In the Preceding report, the distribution of glycosidase among various strains of coli form group bacteria. In the present study, the characteristics of β-galactosidase which is required in the hydrolysis of lactose were examined. The results obtained showed, as reported by Gottschalck, that β-galactosidase reacts also on the oxygen bridge of p-nitrophenol β-galactoside. 2. By knowing that the optimal temperature for β-galactosidase is 43±1°C and it inactivated appoximately at 56°C, so far as the hydrolysis of lactose is concerned, the meaning of the cultivation temperature which is 45.5+0.2°C has been clarified.
Studies on daily living time was carried out on 487 pupils in the two middle schools of the farming villages in Chiba-Prefecture in October, 1951. According to the results, boys and girls in these villages sleep generally longer when compared with urban pupils, and boys spend considerably much time in playing, sports and reading, while girls have less time for these. And time for helping their parents in the housework and the farm-work is more spent by girls than by boys.