on survival or development [ JOURNAL OF REPRODUCTION AND FERTILITY; Glenister,PH; 70(1):229-234 (1984) ]. Chinese hamster ovary fibroblasts in 10% DMSO show 3.5 times less damage from 600  rad of x-ray irradiation at liquid nitrogen temperature compared to 22ºC [ CRYOBIOLOGY; Ashwood-Smith,MJ; 16(2):132-140 (1979)]. A flux of 2 Χ 10 15 photons cm −2  s −1 of 160 nanometer