1. Research Related to Biopersistence The prospects for progress will be fur
2. A
number of issues related more specifi- ther enhanced as more man-made fibers
3. cally to biopersistence have already been are evaluated in life-span in vivo bioassays
4. discussed. The concept of biopersistence- of comparable quality to those recently
5. the retention of fibers in the Iung over conducted and in which it will be espe