PA6/PTFE blends with varying polytetrafluoroethylene content from 3% to 15%(mass fraction) were irradiated by 60Co gamma-ray with various doses(20,50 and 100 kGy) under ambient conditions.Moisture absorption test,U-no...PA6/PTFE blends with varying polytetrafluoroethylene content from 3% to 15%(mass fraction) were irradiated by 60Co gamma-ray with various doses(20,50 and 100 kGy) under ambient conditions.Moisture absorption test,U-notched Charpy impact test and quasi-static tension and bending were conducted to investigate the effect of irradiation on moisture absorption and mechanical properties of the blends.It is shown that the exposure of the blend to 60Co irradiation improves the tensile modulus,tensile strength and flexural modulus due to irradiation induced cross-linking in PA6 phase.However,the Charpy impact strength of the blends is much lower than that of the original PA6 and it decreases slightly with the increase of irradiation dose.Moreover,the flexural modulus increases to a maximum value and then decreases with further increasing the PTFE content,and the moisture absorption decreases with the increase of the PTFE content and irradiation dose.展开更多
The effect of recombinant human interleukin-6 ( rhIL-6) on the early phase of post-irradiation hematopoietic recovery ( mainly CFU-S, CFU-GM and CFU-E) has been studies in 6.5 Gy gamma-irradiated C57BL / 6J mice, whic...The effect of recombinant human interleukin-6 ( rhIL-6) on the early phase of post-irradiation hematopoietic recovery ( mainly CFU-S, CFU-GM and CFU-E) has been studies in 6.5 Gy gamma-irradiated C57BL / 6J mice, which had been given subcutaneous injection of rhIL-6 b. i. d. at 10, 100, 200, 500 and 1 000μg/kg/d for 4 or 6 consecutive days started from 30 min after irradiation. It was shown that the effect of IL-6 on the early phase of post-irradiation hematopoietic recovery is dose-dependent and diphasic. At the doses of 200-1000μ/kg/d, IL-6 had a favorable effect on post-irradiation hematopoietic recovery expressed as increse of spleen weight and CFU-S, and elevation of CFU-GM yield and total CFU-GM content in femur. Administration of relatively low doses of IL-6(10-100 μg/kg/d) suppressed postirradiation hematopoietic regeneration. High a dose (1 000μg/kg/d) did not show any stronger stimulative effect on post-irradiation hematopoietic reconstitution. There is an optimal range of IL-6 dose for展开更多
基金Project(10772156) supported by the National Natural Science Foundation of ChinaProject supported by the Scientific Research Foundation for the Returned Overseas Chinese Scholars,State Education Ministry of China
文摘PA6/PTFE blends with varying polytetrafluoroethylene content from 3% to 15%(mass fraction) were irradiated by 60Co gamma-ray with various doses(20,50 and 100 kGy) under ambient conditions.Moisture absorption test,U-notched Charpy impact test and quasi-static tension and bending were conducted to investigate the effect of irradiation on moisture absorption and mechanical properties of the blends.It is shown that the exposure of the blend to 60Co irradiation improves the tensile modulus,tensile strength and flexural modulus due to irradiation induced cross-linking in PA6 phase.However,the Charpy impact strength of the blends is much lower than that of the original PA6 and it decreases slightly with the increase of irradiation dose.Moreover,the flexural modulus increases to a maximum value and then decreases with further increasing the PTFE content,and the moisture absorption decreases with the increase of the PTFE content and irradiation dose.
文摘The effect of recombinant human interleukin-6 ( rhIL-6) on the early phase of post-irradiation hematopoietic recovery ( mainly CFU-S, CFU-GM and CFU-E) has been studies in 6.5 Gy gamma-irradiated C57BL / 6J mice, which had been given subcutaneous injection of rhIL-6 b. i. d. at 10, 100, 200, 500 and 1 000μg/kg/d for 4 or 6 consecutive days started from 30 min after irradiation. It was shown that the effect of IL-6 on the early phase of post-irradiation hematopoietic recovery is dose-dependent and diphasic. At the doses of 200-1000μ/kg/d, IL-6 had a favorable effect on post-irradiation hematopoietic recovery expressed as increse of spleen weight and CFU-S, and elevation of CFU-GM yield and total CFU-GM content in femur. Administration of relatively low doses of IL-6(10-100 μg/kg/d) suppressed postirradiation hematopoietic regeneration. High a dose (1 000μg/kg/d) did not show any stronger stimulative effect on post-irradiation hematopoietic reconstitution. There is an optimal range of IL-6 dose for
