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Utsumi, Hideo,Akira Hamada 嶺南大學校 環境問題硏究所 1993 環境硏究 Vol.12 No.2
In order to establish the method of bio-assay for the safety of drinking water, genotoxicity and cytotoxicity of micropollutants in water were studied. Genotoxicity was estimated with Ames Salmonella mutagenicity test, and cytotoxicity was evaluated with the cultured mammalian cells, HL-60, rat liver hepatocytes and mouse peritoneal macrophages. The dissolved substances in water were recovered from raw, chlorinated, and rapid-filtrated waters by adsorption with XAD-2. Some of the samples showed strong direct genotoxicity and/or cytotoxicities, but no correlation was observed between the results with the two bio-assays. The findings indicate that the combination of genotoxicity test with cytotoxicity one is recommended to secure the safety of drinking water.
Abe,Akemi,Utsumi,Hideo 嶺南大學校 環境問題硏究所 1995 環境硏究 Vol.15 No.1
Lethal action and the removal of molecular sulfur by copper treatment were investigated in the testing of mutagenicity for sediment samples. The results can be summarized as follows. (1) Sediment crude extracts showed lethal action on tester strains, TA98 and TA100. (2) The lethal was stronger in the sample from which larger amounts of extracts per unit weight were obtained. (3) The lethal action was reduced with the addition of the metabolizer S9 mix. (4) TA98 was more resistant than TA100 against the lethal substances in sediment extracts. (5) Removal of molecular sulfur raised the survival ratio of tester strains. (6) Lethal substances including molecular sulfur distributed in non-polar and slightly polar fraction, and medium or high polar fractions did not show lethal action. (7) Removal procedure of molecular sulfur was proper for applying on the fraction contained non polar and slightly polar compounds.
In vitro bioassay for estrogen-like endocrine disrupting chemicals
ICHIKAWA, Kazuhiro,HAN, Sang-Kook,KIM, Su-Hyon,UTSUMI, Hideo 嶺南大學校 環境問題硏究所 1998 環境硏究 Vol.18 No.1
Eighty chemicals including pesticides synthetic estrogens, raw materials used in industry were applied to E-Screen assay in this study. MCF-7 cell, used in E-Screen assay, is known to be proliferated by addition of estrogens and have been widely used to defect estrogen-like chemicals. Nine of 80 chemicals showed proliferative activity in a dose-dependent manner. Six of these 9 chemicals were hsted as EDCs in Strategic Programs on Environmental Endocrine Disruptors by Environmental Agency. Government of Japan Four chemicals were recognized to have proliferative activities in this study.