Shinichi Tomiyama

Nutritive Efficiency of Long-term Feeding of Fatty Acid with Monoglyceride

ウィスター系ラットを用い, 6ヵ月間にわたり通常の脂質含量で脂肪酸をモノグリセライドとともに供与し, 栄養的有効性および生体への影響を検討した結果,1) 脂質の吸収率, 飼料の効率はトリグリセライドを供与した場合と同等であった。2) 動物の体重増加量も飼育期間を通してトリグリセライドを供与した場合と同等であり, 高含有量で供与した前報のような成長率の低下は認められなかった。3) 肝重量, 病理組織検査でも異常性は低かった。4) 脂肪酸の一部をC15奇数飽和脂肪酸 (pentadecanoic acid) で供与した場合も飼料の効率は同等に有効であったが, 病理組織検査では奇数脂肪酸供与区の異常性がやや高い傾向を示した。

Studies on Biodegradation of Synthetic Detergents. II.

The shake culture method was adopted as the Testing Method for Biodegradability of Synthetic Detergent in the Japanese Industrial Standard in April 1967. Japanese Ministry of International Trade & Industry is executing its administrative recommendation toward the change-over to biodegradable detergents. Detergent industry is promoting the change-over by its own initiative prior that recomendation. The authors estimated that the proportion of biodegradable surf actants with straight alkyl chain was ca. 54% of the total anionic surfactants for use of household detergent and that of linear alkylate sulfonates within the alkylbenzene sulfonates used was ca. 38% in the middle of 1967, and that these proportions turned to ca. 61% and 48%, respectively, at the end of 1967. At that turning stage, determinations of the content of linear alkylate self onates in total of the alkylbenzene sulfonates in raw municipal sewages, effluents from sewage treatment plants, and river waters were carried out in Aug.-Sept., 1967 and Feb.-March, 1968. It was found that the content of linear alkylate sulfonates were <531% (Aug.-Sept., 1967) and <540% (Feb.-March, 1968). This rather higher figures of some 30 or 40% obtained with river waters indicate the direct discharge of domestic sewage into rivers and necessity for treating the sewage in sewage treatment plants. From those results, it is believed that remarkable effect of the change over is difficult to expect under the present situation, some 120% of pervasion of sewerage systems.