目的观察胎盘接种建立小鼠巨细胞病毒对仔鼠的听力的影响。方法MCMV Sm ith标准株经小鼠胚肺细胞增殖传毒后,用ELISA筛选无MCMV感染史性成熟期小鼠,雌雄同笼受孕。孕龄12.5天时,模型组胎盘显微注射MCMV,手术对照组注射DMEM培养基,空白...目的观察胎盘接种建立小鼠巨细胞病毒对仔鼠的听力的影响。方法MCMV Sm ith标准株经小鼠胚肺细胞增殖传毒后,用ELISA筛选无MCMV感染史性成熟期小鼠,雌雄同笼受孕。孕龄12.5天时,模型组胎盘显微注射MCMV,手术对照组注射DMEM培养基,空白对照组只手术开腹,清点孕囊,不做任何特殊处理。待母鼠自然分娩后,随机选取4周龄仔鼠,应用听性脑干反应(aud itory brainstern response,ABR)检测听力水平。结果模型组与其他各组比较,ABR I波阈值明显上升,差异有显著意义(F=5.984,P=0.009)。结论经胎盘接种MCMV可以引起仔鼠的听力损伤。展开更多
The auditory brainstem response (ABR) was measured for 90 cars of norml gui-nea pigs,from which the mean latency,amplitude and recognition of waves were obtain-ded.The waves were classified into six types,with wave Ⅲ...The auditory brainstem response (ABR) was measured for 90 cars of norml gui-nea pigs,from which the mean latency,amplitude and recognition of waves were obtain-ded.The waves were classified into six types,with wave Ⅲ as the main wave which ac-counted for 77.1% of all the waves.The frequency domain of each type was analysed bymeans of digital filtering and auto-regressive (AR)estimation.The main frequency com-position of ABR in the guinea pigs was restricted within 1600 Hz,in which there werethree peaks at AR spectrum,the mean value of the peaks being 107.33 Hz,566.67 Hzand 1076 Hz respectively.The AR spectrograms of all types waves were very similar toeach other.展开更多
文摘The auditory brainstem response (ABR) was measured for 90 cars of norml gui-nea pigs,from which the mean latency,amplitude and recognition of waves were obtain-ded.The waves were classified into six types,with wave Ⅲ as the main wave which ac-counted for 77.1% of all the waves.The frequency domain of each type was analysed bymeans of digital filtering and auto-regressive (AR)estimation.The main frequency com-position of ABR in the guinea pigs was restricted within 1600 Hz,in which there werethree peaks at AR spectrum,the mean value of the peaks being 107.33 Hz,566.67 Hzand 1076 Hz respectively.The AR spectrograms of all types waves were very similar toeach other.
