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카드뮴에 대한 녹조류 Selenastrum capricomutum(Chlorophyceae)의 세포활력도 및 peroxidase 활성도 변화
최은주(Eun-Joo Choi),이상구(Sang-Goo Lee),이승진(Seung-Jin Lee),문성경(Seung-Kyung Moon),박용석(Yong-seok Park),이기태(Ki-tae Rhie) 환경독성보건학회 2003 환경독성보건학회지 Vol.18 No.4
Physiological cellular activities responses to cadmium (Cd) exposure in green algae with several reductases activities and viability of the cell were examined. The cell division of green algae, Selenastrum capriconutum treated with 5ppm was significantly decreased than that of normal algae. The mean cell number of normal algal culture was as twice much as than that of algae at 6 days after Cd treatment. The cellular viability of algae was analysed by f1ow-cytometry with f1uorescent dye after esterase reaction on cell membrane. The 85.35% of cellular viability of normal culture was decreased to 34.35% when algae was treated with 5 ppm of Cd at 6 days after treatment. It was considered that those method of flow-cytometry is useful tool for toxicity test on micro-organisms in the respect of identifying cellular viability. Also, the activities of both glutathione peroxidase (GPX) and ascorbate peroxidase(APX), which are indirectly react against oxidative stress through reduction of glutathione by Cd were significantly increased with 25%. It is considered that both GPX and APX are involved in the metabolic pathway of Cd-detoxification with similar portion in Selenastrum capricornutum.
Glucose-6-phosphate dehydrogenase를 이용한 Moina macrocopa의 중금속 독성 검정
박용석(Yong-seok Park),이상구(Sang-Goo Lee),이승진(Seung-Jin Lee),문성경(Seung-Kyung Moon),최은주(Eun-Joo Choi),이기태(Ki-Tae Rhie) 환경독성보건학회 2003 환경독성보건학회지 Vol.18 No.4
A rapid, inexpensive enzymatic method is proposed for indirect water quality testing in terms of heavy metal toxicity. The activity of glucose-6-phosphate dehydrogenase was applied for heavy metal toxicity test as an effective criterion in water quality.<br/> The toxicity of Pb (lead) and Cd (cadmium) for water flea, Moina macrocopa, were evaluated for 2~8 days with variables of mobilization ability. And the reproduction impairment of Moina macrocopa were investigated as the parameter of chronic toxicity test for Pb and Cd. As a result, the EC50 for immobilization of Moina macrocopa were Pb and Cd were 1.6749 and 0.4683, respectively. The values of reproductive impairment to Moina macrocopa for Pb and Cd were 9.5938 and 8.3264 in EC50.<br/> A significant alteration of G6PDH (Glucose-6-phosphate dehydrogenase) activity of Moina macrocopa was observed when Cd and Pb were treated in media. The results obtained indicate that G6PDH activity of Moina macrocopa can be used as an indicative parameter in aquatic toxicity tests for heavy metals.