本文介绍了测量海水中224Ra和223Ra比活度的国际通用仪器镭延迟符合计数器(Ra De CC),该仪器具有效率高、灵敏度高、背景值低、方便携带和适合海上现场测量等优点。结合本实验室3 a使用经验和工作数据,对仪器测量误差、探测效率、本底值和探测限等做出系统的阐述和讨论。结果表明,Ra De CC对224Ra和223Ra的探测效率分别在0.47~0.59和0.45~0.57之间,探测限分别为0.
Inteal standards are critical for quantitative RNA analyses. Housekeeping genes are often used as inteal standards with the assumption that their express-ion le
The possibility of the 2 h oral glucose tolerance test(OGTT)as an alteative to the 3 h OGTT was investigated based on data from a national survey on pregnancy-a
The inhibitory effect of different reperfusion periods 45 min following hepatic ischemia on the expres sion of cholecystokinin(CCK)and vasoactive intestinal pep
Legionella is a causative agent of legionellosis or Legionnaires’ disease.Infection with Legionella spp.is an important cause of community and hospital-acquire
In order to explore the role of cyclin-dependent kinase 4 (cdk4) in neurodegenerative diseases, lentiviraldelivered RNA interference (RNAi) was used to silence