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Highly mutagenic water of the Katsura River, Kyoto, and moderately mutagenic of the Asahi River, Okayama, were used to evaluate the efficacy of three concentration techniques, the blue-chitin column, the blue-rayon hanging, and the XAD-2 column. These two river waters have been shown to exhibit high mutagenicity in the assay with Salmonella typhimurium TA98 with metabolic activation. With this assay...
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