The contents of sodium, potassium and calcium in common animal foodstuffs; fish, meats, milk, eggs and their preparations were determined and compared with the values in the literature. Sodium contents were found to be 50 to 100mg per 100g in most of the samples, though the values greater than 100mg per 100g were also found in severalcases. Potassium contents were mostly 200 to 300mg per 100g. The values were slightly lower in eggs and milk, and were definitely lower in their preparations possibly due to the loss during the processings. Calcium contents were relatively higher in small fish, shellfish, egg yolk, milk and their preparations, while they were under 20mg per 100g in other fish. Most of the sodium values were not in agreement with those found in the literature. The values given in the literature varied greatly according to the authors. The results on meats and eggs found by the authors were consistent with the values of Sherman. The values for potassium did not always coincide with the values in the conventional food composition tables, but those for calcium were fairly in agreement.
Contents of sodium, potassium and calcium in vegetable foods (cereals, pulses, potatoes, fruits, vegetables and their preparations) were measured and compared with the values found in conventional food composition tables. Except for some vegetables and seaweeds the sodium contents were found to be smaller than l0mg per 100g, excluding the preparations to which sodium chloride had been added. They were generally lower than those in animal foodstuffs. The contents of potassium varied widely among the foods. Generally, they were more than 1000mg per 100g in seaweeds. They were the highest values in this experiment, followed by the values for potatoes, 400 to 500mg per 100g. They were relatively low in most of the cereals, fruits and vegetables, 100 to 200mg per 100g. Generally, the calcium contents were higher than in animal foods, mostly over 30mg per 100g in most of the vegetable foods. Some pulses and seaweeds were found to contain over 100mg per 100g. Compared with the values given in conventional food composition tables, sodium contents coincided fairly with those of Sherman but they were generally lower than those given in The Tables of Food Composition in Japan, edited by Kokumin Eiyo Shinkokai in he National Institute of Nutrition. Potassium and calcium contents coincided fairly well with those given in the conventional tables.
Self-selections of starch, olive oil, casein, cod-liver oil and dry yeast in the albino rats were observed. Summarizing results obtained in the present experiment, individual differences among feeding patterns of rats were noted but periodical fluctuations were small within individual rats. These findings seem to show the feeding habit, but rather they look like the outcomes of preferences of the individual subjects. Discussing the results as to inter-nutrients relations, each subject ingested 11-61% of carbohydrate, 10-31% of fat, 14-45% of protein, 0-2.4% of cod-liver oil and 1.3-4.2% of dry yeast in relation to total ingestion. So that the ratio of ingestion in the present result fairly corresponds to the standard diet of rats. Therefore, it may not be conceivable that the deficiencies of nutrients are elicited by the self-selections of diets. However, further investigations are necessary to confirm whether the present feeding patterns coincide with physiological needs of animals and then hygienically reasonable for each animal or not.
In the self-selections of inorganic salts, selection patterns varied markedly individually as were found in organic nutrients. A constant selection pattern was not found in the mean selections of the rats throughout the experiment, and then individual differences were noted. However, mean selection of 5 days of individual animal showed that each animal maintained a constant selection in the individual manner throughout the experiment. Larger fluctuations were observed among animals in th selections of inorganic salts as compared with those of organic nutrients.
The effects of several compounds on the transportrate of radioactive phosphorus 32P in rats had been previously reported by using the perfusion technique. In this report, the relationship between the changes in 32P absorption rate across peritoneum into blood and the daily changes in histological examinations after operation is discussed. Two groups of rats, were used in the experiment, the one having a defect of 2cm2 on peritoneum and the other being sutured with “Tetoron Mesh” for the defect. The results obtained were as follows. 1. The transport rate of 32P across peritoneum into blood decreased with the gradually developing fibrination found in the tissue of the defected peritoneum of rat. 2. 32P absorption rate in case of being suturedwas larger than that in case of being simply defected throughout the period following the operation. 3. The period of maximal absorption of 32P in case of being sutured with “Tetoron Mesh” appeared on the 1st to 3rd weeks following the operation, while it appeared on the 1st week in case of being simply defected.