“…It appears therefore that ADR, DNR and AD-32, irrespective of their ability to bind to DNA, affected membrane permeability functions dependent on the metabolic energy supply, by impairing mitochondrial activity. Interactions at the mitochondrial level, resulting in impaired metabolic reactions have been already observed by several authors (Gosalvez et al, 1974;Iwamoto et al, 1974;Ferrero et al, 1976;Mailer & Petering, 1976;Folkers et al, 1977;Goormaghtigh et al, 1982;Solaini et al, 1985) and our findings are consistent with these reports.…”