Animal experiments in toxicology, dose-effect curves, extrapolation of toxicological results from model system to humans, difference of species and toxicity, acute, subacute, chronic toxicity, mutagenesis, carcinogenesis, theratogenesis, oxidation damage reproductive toxicity, activation and deactivation of toxic substances, pesticides, heavy metals, epidemiological methods, food toxicology, air toxicology, water toxicology, environmental toxicology.