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- W1520380047 abstract "The marine ciliate Parauronema acutum converted 2-aminofluorene and 2-acetylaminofluorene to compounds with mutagenic activity in the Ames Salmonella test. The ciliate, however, did not activate benzo (α)pyrene or benzanthracene or destroy the mutagenic properties of nitrosoguanidine. Homogenates, when substituted for the liver S-9 fraction in the Salmonella /microsome test, activated 2-aminofluorene and 2-acetylaminofluorene to mutagens. Benzo(α)pyrene and benzanthracene were not activated, nor was nitrosoguanidine inactivated. Phenobarbitol did not induce or increase the amount of activating activity. The activation showed no requirement for the reduced nicotinamide adenine dinucleotide phosphate-regenerating system required by liver P-450 cytochromes. Upon differential sedimentation of a cell homogenate, the majority of the activity sedimented with a small-particle fraction with sedimentation properties like those of microsomes from higher eucaryotes. Benzo(α)pyrene, although not metabolized, was accumulated by cultures of P. acutum at a linear rate and was not appreciably released (10%) after removal of benzo(α)pyrene from the incubation medium. Hence, this ciliate could convert certain polynuclear aromatic hydrocarbons to mutagens and accumulate others." @default.
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- W1520380047 date "1981-05-01" @default.
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- W1520380047 title "Activation of Polynuclear Aromatic Hydrocarbons to Mutagens by the Marine Ciliate <i>Parauronema acutum</i>" @default.
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- W1520380047 doi "https://doi.org/10.1128/aem.41.5.1238-1242.1981" @default.
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