层流架内应用带空气过滤罩的鼠盒繁育Scid小鼠研究初报

采用带空气过滤罩的鼠盒在层流架内饲育Ｓｃｉｄ小鼠获得成功。平均窝产仔数４．８只，肥孕率６６．７％，离乳率较高可达９６．６％，其骨髓活化ＮＫ细胞用于异基因骨髓移植可促进骨髓植入和造血功能重建，预防移植物抗宿主病（ＧＶＨＤ），并增强抗肿瘤效应（ＧＶＴ）。该法可以作为缺乏现代化馈养设施又急需Ｓｃｉｄ小鼠的单位进行中短期饲育。     

Precipitation variations recorded in Guliya ice core in the past 400 years

Based on the Guliya ice core records, the precipitation in the past 400 years was retrieved. Its rela tions with other regions were also analyzed. The results demonstrated that there were two high-precipitation periods and two low-precipitation periods in Guliya ice core since 1571 AD. The average precipitation in the two high-precipitation periods was 42 mm (21%) higher than that in the two low-precipitation periods. The precipitation recorded in the Guliya ice core was consistent with that in Dunde ice core. The variation trends of precipitation in the Guliya ice core and the northern hemisphere are similar. During the extremely wet years in the northern hemisphere, the precipitation recorded in the Guliya ice core was two times the long-term average. However, the annual precipitation was 38% less than that of the long-term average in extremely dry years.     

桩-弹性承台体系的受力分析

以虎门大桥辅航道通航孔嵌岩桩基础为工程背景,通过桩项反力、承台表面位移随承台厚度和布桩形式变化的分析,指出承台的厚度、桩的布置形式都会对桩一承台体系的内力和变形产生影响,指出桩-弹性承台进行桩基础的计算分析是比较全面的．