... γ -terpinene in lemon oil (85,100 ppm), citral in lemon oil (75,000 ppm) piper-ine in black pepper (47,100 ppm), and geranial in lemon juice(14,400 ppm) and lemon oil (11,300 ppm). Natural pesticides ... Environmental Protection Agency,199 6a) . The proposed EPA guidelines permit the use of non-linear approaches to low-dose extrapolation if warranted bymechanistic data. In recent years, the EPA has ... CarcinogenicPotency Database. Average TD50values, have been calculated separately for rats and mice, and the more potent value is used for calculating possible hazard. a ·, no data in the CPDB; a number...