Auditory cortical cvokod rcsponse(ACER) and auditory brainstom cvoked response (ABR) were recorded in guinea pigs before and after irradiation of ^(60)Co γ-ray. A single dose of irradiation on head was 90Gy and 70Gy ...Auditory cortical cvokod rcsponse(ACER) and auditory brainstom cvoked response (ABR) were recorded in guinea pigs before and after irradiation of ^(60)Co γ-ray. A single dose of irradiation on head was 90Gy and 70Gy in two groups, respectively. Two h after irradiation. the threshold shift was 12. 5 dB and 9 dB, and the ACER post-irradiation amplitude ex- ceeded the maximum pre-irradiation value by 20% and 37%. Six h after irradiation, the threshold shift increased to 37 dB and the maximum amplitnde decreased to the level of pre-irradiation in 70Gy-group. In another group, right auditory bulla arca was irradiated with a total dose of 45Gy in a course of six fractions/two weeks. Fourteen d after irradiation, the threshold shift of ABR was 118 dB and the latency of wave I was longer. The amplitude-intensity curve was after irradiation. Histological observation using scanning showed that only outer hair- cells in the basal coil of the cochlea were 6 h after irrdiation 50Gy-group. Bul 16 h later, outer, hair cells in all coils of the cochlea were found to be destroyed extensively and inner cells were destroyed slightly. In 45Gy-group, 14 d after irradiation, outer hair cells in all coils of the cochlea were damaged and no inmer hair cell was injured severely.展开更多
目的探讨不同剂量^(60)Co-γ射线辐照灭菌对蜈蚣药粉8种核苷类成分含量及微生物指标的影响。方法分别以4,6,8,10 k Gy的^(60)Co-γ射线对样品进行动态辐照灭菌操作,按2015年版《中国药典(一部)》要求检测灭菌前后样品的水分、总灰分、...目的探讨不同剂量^(60)Co-γ射线辐照灭菌对蜈蚣药粉8种核苷类成分含量及微生物指标的影响。方法分别以4,6,8,10 k Gy的^(60)Co-γ射线对样品进行动态辐照灭菌操作,按2015年版《中国药典(一部)》要求检测灭菌前后样品的水分、总灰分、酸不溶性灰分、酸溶性浸出物、重金属及有害元素、黄曲霉毒素及微生物限度;采用高效液相色谱法测定4,6,8,10 k Gy^(60)Co-γ射线辐照灭菌后样品的化学成分含量。结果4,6,8,10 kGy^(60)Co-γ射线辐照灭菌样品的水分、总灰分、酸不溶性灰分、酸溶性浸出物、重金属及有害元素、黄曲霉毒素比较,差异均无统计学意义(P>0.05);大于6 kGy^(60)Co-γ射线辐照灭菌样品中,需氧菌、酵母菌、霉菌总数均随辐照剂量增加而减少,耐胆盐革兰阴性菌均小于10 cfu/g,微生物限度均符合2015年版《中国药典(四部)》规定,且均未检出大肠埃希菌和沙门菌;综合工业生产中的灭菌成本问题,8,10 kGy^(60)Co-γ射线动态辐照灭菌效果最佳;灭菌前后,胞嘧啶、胞苷、次黄嘌呤、黄嘌呤、尿苷、胸腺嘧啶、2’-脱氧肌苷、胸苷8种核苷类成分含量比较,差异均无统计学意义(P>0.05)。结论^(60)Co-γ射线辐照灭菌对蜈蚣药粉质量无明显影响,且8~10 kGy辐照灭菌效果最佳。展开更多
文摘Auditory cortical cvokod rcsponse(ACER) and auditory brainstom cvoked response (ABR) were recorded in guinea pigs before and after irradiation of ^(60)Co γ-ray. A single dose of irradiation on head was 90Gy and 70Gy in two groups, respectively. Two h after irradiation. the threshold shift was 12. 5 dB and 9 dB, and the ACER post-irradiation amplitude ex- ceeded the maximum pre-irradiation value by 20% and 37%. Six h after irradiation, the threshold shift increased to 37 dB and the maximum amplitnde decreased to the level of pre-irradiation in 70Gy-group. In another group, right auditory bulla arca was irradiated with a total dose of 45Gy in a course of six fractions/two weeks. Fourteen d after irradiation, the threshold shift of ABR was 118 dB and the latency of wave I was longer. The amplitude-intensity curve was after irradiation. Histological observation using scanning showed that only outer hair- cells in the basal coil of the cochlea were 6 h after irrdiation 50Gy-group. Bul 16 h later, outer, hair cells in all coils of the cochlea were found to be destroyed extensively and inner cells were destroyed slightly. In 45Gy-group, 14 d after irradiation, outer hair cells in all coils of the cochlea were damaged and no inmer hair cell was injured severely.
文摘目的探讨不同剂量^(60)Co-γ射线辐照灭菌对蜈蚣药粉8种核苷类成分含量及微生物指标的影响。方法分别以4,6,8,10 k Gy的^(60)Co-γ射线对样品进行动态辐照灭菌操作,按2015年版《中国药典(一部)》要求检测灭菌前后样品的水分、总灰分、酸不溶性灰分、酸溶性浸出物、重金属及有害元素、黄曲霉毒素及微生物限度;采用高效液相色谱法测定4,6,8,10 k Gy^(60)Co-γ射线辐照灭菌后样品的化学成分含量。结果4,6,8,10 kGy^(60)Co-γ射线辐照灭菌样品的水分、总灰分、酸不溶性灰分、酸溶性浸出物、重金属及有害元素、黄曲霉毒素比较,差异均无统计学意义(P>0.05);大于6 kGy^(60)Co-γ射线辐照灭菌样品中,需氧菌、酵母菌、霉菌总数均随辐照剂量增加而减少,耐胆盐革兰阴性菌均小于10 cfu/g,微生物限度均符合2015年版《中国药典(四部)》规定,且均未检出大肠埃希菌和沙门菌;综合工业生产中的灭菌成本问题,8,10 kGy^(60)Co-γ射线动态辐照灭菌效果最佳;灭菌前后,胞嘧啶、胞苷、次黄嘌呤、黄嘌呤、尿苷、胸腺嘧啶、2’-脱氧肌苷、胸苷8种核苷类成分含量比较,差异均无统计学意义(P>0.05)。结论^(60)Co-γ射线辐照灭菌对蜈蚣药粉质量无明显影响,且8~10 kGy辐照灭菌效果最佳。
