Cuticle selective toxicity

When tests are performed on terrestrial animals, it is common to apply single (measured) doses orally, topically (i.e., applied to the skin or cuticle), or by injection into tissues or body fluids. There can be very large differences among groups of organisms and among species in their susceptibility to the toxic action of chemicals. The selective toxicity ratio (SER) is expressed in terms of the median lethal dose, and is important for the differentiation between beneficial organisms and pests ... 

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