1. empirically demonstrate the effects of sin- specific contaminants in controlled labora
2. gle-pulsed acute and low-level chronic tory studies. Relatively few such experi
3. exposures on subsequent survival of popu- ments have been conducted and the
4. lations. Experiments in progress in our lab- generality of the correlation must be tested
5. oratories involve both acute and chronic by field-laboratory assessments for several