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• W2047109726 abstract "As our hypothesis was that soil mutagens are airborne mutagens, possibly modified by soil microorganisms, we checked solvent extracts from agricultural and forest soils collected during late summer in the environment of Mainz, a region highly charged by anthropogenic air pollution, or near Bayreuth, a rural low charged region of Germany, or in a remote region of western Corsica without anthropogenic air pollution for the presence of mutagenicity in Salmonella typhimurium. Levels of mutagenic activities were quantified by calculation of revertants/g from the initial slope of dose-response curves applying tester strains S. typhimurium TA 98 and TA 100 in the absence and presence of an activation system from rat liver (S9). Three soils from Corsica did not induce mutagenicity under any test condition. However, most soils from Germany exhibited mutagenic activities, though preferentially in strain TA 98, but no statistically significant differences could be detected between 27 soils from the Mainz and nine soils from the Bayreuth regions. On the other hand, no correlation could be detected between the levels of mutagenic activities at any test condition and agricultural practice - rye growing, viniculture, fruit growing, meadow, and fallow - texture of soils - % composition of clay, slit, and sand - or the contents of organic matter. The only significant difference of mutagenicity was, however, found with S. typhimurium TA 98-S9 between forest soils of pH approximately 4.0 as compared with agricultural soils of pH approximately 7.0. The presence of antimutagens in soil as demonstrated by the course of dose-response curves of the three soils from Corsica may be another possible confounder. Calculation of mean values of mutagenic activities for all soils from Germany gave the following results: S. typhimurium TA 98: 69.7+/-153.2 (-S9); 63.0+/-176.3 (+S9); S. typhimurium TA 100:-144.7+/-399.4 (-S9); 43.3+/-172.0 (+S9) revertants/g of dry soil. In another series of experiments, soil mutagenicity in 10 rye fields near Mainz was monitored for 1 year. It became evident that low levels of mutagenic activities in late summer increased during autumn, reached a peak in late winter, and subsequently, decreased during spring and summer. These results agree with the hypothesis of an airborne origin of soil mutagens, deposition, and an adjacent transformation to non-mutagenic compounds by soil microorganisms." @default.
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• W2047109726 date "2000-12-01" @default.
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• W2047109726 title "Soil mutagens are airborne mutagens: variation of mutagenic activities induced in Salmonella typhimurium TA 98 and TA 100 by organic extracts of agricultural and forest soils in dependence on location and season" @default.
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• W2047109726 doi "https://doi.org/10.1016/s1383-5718(00)00089-9" @default.
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