Abstract
Substituted phenylalkylureas are widely used as herbicides. In the assay system of Friedman and Staub, which measures the inhibition of testicular DNA synthesis (DSI test), most of these substances showed a positive reaction, i.e. they depressed thymidine incorporation significantly. Bacterial tests demonstrated a weak mutagenic activity, too; but in the micronucleus test the compounds were almost inactive. As one member of this group of chemicals — the herbicide monuron — is a recognized carcinogen, these results seem to indicate a possible hazard, but more investigations are needed to quantify this danger.
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