RESUMEN
In this paper, we report damage and regeneration of bone marrow hemopoietic tissue following 80Co ?-ray radiation at various doses in dogs and compare its damaged character after large dose radiation at two dose rates.The results show that the regeneration rate of marrow tissue was 31.6%(6/19)after less than 5Gy radiation, and the marrow was completely aplastic after more than 7Gy radiation. Although injury of marrow parenchyma is analogous after large dose radiation at two dose rates, marrow hemorrhage at low rate is less serious than that at high rate.
RESUMEN
This paper describes the study on intramedullary injection of fetal liver cell suspension into the lethally irradiated mice. The results show that the therapeutic effect of intramedullary injection is better than that of intravenous one.It is suggested that the fetal liver cells injected into the bone marrow cavity can settle down and proliferate here and the volume of injection should be limited.