Influence of vibration (frequency 23-26/sec., breadth 1-2mm) continued for six hours every day upon protein metabolism of white rats was inspected for six weeks. Though the protein availability of the rats exposed to the vibration was slightly inferior and their nitrogen balance showed more positive compared with the results of the rats in normal environment, the growth of the former was retarded nearly by 8 per cent in contrast to the latter.
To find out the Protein score of protein ingested by Japanese people, the essential amino acid intakes was calculated from the data of National Nutrition Survey of Japan in 1959 to 1961, with some of the data of amino acid composition of Japanese foods, recently reported. According to the result, the limiting amino acids were tryptophan and total of sulfur containing amino acid, and the first limiting amino acid was tryptophan. And the Protein score was 77.6, 77.8, 77.8, respectively.