著者

井上 豊治 林 隆義 森 忠繁

出版者

公益社団法人 日本水環境学会

雑誌

水環境学会誌 (ISSN:09168958)

巻号頁・発行日

vol.16, no.11, pp.789-796, 1993-11-10 (Released:2008-04-21)

参考文献数

28

被引用文献数

4 4

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In vitro effects of surfactants in common use as detergents and related compounds were investigated on the erythrocyte membrane and respiratory activity of rat liver mitochondria.The hemolytic activity of main surfactants tested was in the following order with the EC50 values less than 10mg·l-1 ; Neopelex F-25 (LAS), Spark (α-SF), Flake marseille (soap), LipolanPB-800 (AOS), standard soap (JIS K 3303) and SDS. There was weak hemolytic activity from the effect of Emulgen 108 (POEAE) and Emal 20C (AES). On the other hand, the mitochondrial respiration inhibiting activity (IC50) was strong in Flake marseille (5.5mg·l-1) and standard soap (6.8mg·l-1) and follwed by Emulgen 108 (26.0mg·l-1), Emal 20C (32.5mg·l-1), SDS (38mg·l-1), Neopelex F-25 (41.0mg·l-1), Spark (46.0mg·l-1) and Lipolan PB (>50.0mg·l-1). The regression equation between the EC50 (Y) and IC50 (X) values was Y=-0.1198X+2.345, the coeficient of correlation r=-0.0855, indicating little correlation between them. Present data certified the hemolysis inducing and respiration inhibiting effects of surfactants on erythrocytes and mitochondria. These suggest that this system is applicable as a convenient technique to assess the toxicity of environmental contaminants.

著者

森 忠繁 竹岡 清 明石 信爾 大羽 和子

出版者

The Japanese Society for Hygiene

雑誌

日本衛生学雑誌 (ISSN:00215082)

巻号頁・発行日

vol.31, no.5, pp.589-594, 1976-12-31 (Released:2009-02-17)

参考文献数

9

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It is well known that most dust in the lecture room is chalk dust. Dust concentrations were measured at intervals of 3 minutes on a horizontal plane and a vertical plane, after wiping the blackboard for 20 seconds on which many letters were written. Also particle size distributions were measured. The state of dispersing and floating dust in the lecture room can therefore be determined. The results are discussed as a guide to the measurement of dust described in “Requirements for a healthful school environment”.The following results were obtained:1) The dust environment in the lecture room is separated into three sections by dust isoconcentration curves, that is, a position less than 2.5m distant from the blackboard shows the highest dust concentration, and a position farther than 5.0m distant from the blackboard shows the lowest dust concentration.2) Each dust concentration appears similar to a damped oscillation decreasing during 7 to 8 minutes after wiping the blackboard. After this, the dust concentration does not change but shows the floating dust concentration.3) The dust concentration at 10 minutes after wiping the blackboard is almost the same at all heights, but the farther the distance from the blackboard, the lower the concentration of dust.4) All particle sizes of chalk dust are shown to be below 7.0μ diameter (by 1-b) and the greater part are below 5.0μ diameter (by 1-b). The proportion of particles below 0.9μ diameter (by 1-b) shows no change at distances farther than 4 to 5m from the blackboard.5) In order to evaluate correctly the dust environment in the lecture room, dust concentrations should be measured at 10 minutes after wiping the blackboard. Measurements should be taken at more than three positions on the center line of the lecture room, including the teacher's desk, 2.5 to 5.0m distant and more than 5.0m from the blackboard.

著者

森 忠繁 大本 美彌子 石見 敦子 大羽 和子 明石 信爾

出版者

日本衛生学会

雑誌

日本衛生学雑誌 (ISSN:00215082)

巻号頁・発行日

vol.31, no.3, pp.399-403, 1976-08-31 (Released:2009-02-17)

参考文献数

14

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It is well known that water colours and poster colours are made of inorganic pigments that then contain metals such as Cr, Pb, Fe, Co, Cd, Hg etc.. Recently, promoting the culture of sentiments, children practice painting with their fingers using water colours and poster colours, that is called the finger-painting. It is possible that inorganic metals contained in water colours and poster colours are potentially hazardous to children who practice painting in a private school. Each of four colours of red, blue, yellow and green of water colours and poster colours was analyzed for Cr, Pb, Fe, Co, Cd and Hg. And urinary Pb and Cd were determined on twenty five children, ages 4 to 11 of a private school of the painting and five control children ages 3 to 11. The following results were obtained.1) On the whole, water colours and poster colours contained a large quantity of Fe and Pb next to Fe. Especially yellow-2 of water colours contained a large quantity of Pb and showed 1, 012.5μg/g. The dissolved lead was found in water colours that were in lead tubes.2) The average of urinary Pb of tested children was 6.07±6.67μg/l(n=15), and that of control children 2.20±2.59μg/l(n=5). There were not significant difference at levels of 5% between the mean of subjects and that of the control.3) The average of urinary Cd of subjects was 0.68±0.94μg/l(n=25), and that of the control 0±0μg/l(n=5). There were not significant difference at levels of 5% between the mean of subjects and that of the control.4) The coefficient of correlation between experimental length in years and urinary Pb was 0.98, its regression line being yPb=3.18x+2.17(±2.92) as yPb for urinary Pb and x for experimental length in years.5) The coefficient of correlation between experimental length in years and urinary Cd showed 0.91, its regression line being yCd=0.23x+0.11(±0.25) as yCd for urinary Cd and x for experimental length in years.6) The coefficient of correlation between ages and urinary Pb was 0.10, and that between ages and urinary Cd was 0.72. Urinary Cd was apt to increase in proportion to ages.