Test of the Cosmic Transparency with the Baryon Acoustic Oscillation and Type Ia Supernova Data

We use the latest baryon acoustic oscillation and Union 2.1 type Ia supernova data to test the cosmic opacity between different redshift regions without assuming any cosmological models. It is found that the universe may be opaque between the redshift regions 0.35 0.44, 0.44 0.57 and 0.6-0.73 since the best fit values of cosmic opacity in these regions are positive, while a transparent universe is favored in the redshift region 0.57-0.63. However, in general, a transparent universe is still consistent with observations at the lo confidence level.

TO型生物制片透明剂在石蜡组织块脱蜡转透射电镜标本制备中的应用研究

目的探讨利用TO型生物制片透明剂替代二甲苯在石蜡组织块脱蜡转透射电镜标本制备的可行性。方法将石蜡组织块分为常规脱蜡组和快速脱蜡组,采用TO型生物制片透明剂代替二甲苯进行脱蜡后作透射电镜标本制备和观察,并与采用二甲苯按照常规脱蜡步骤进行脱蜡后作透射电镜标本制备的结果进行比较。结果 TO型生物制片透明剂常规脱蜡步骤与二甲苯常规脱蜡后转透射电镜标本的切片与观察效果比较,差异无统计学意义(P>0.05)。结论 TO型生物制片透明剂可用于石蜡组织块转透射电镜标本制备时脱蜡,以减少二甲苯对环境和实验者的危害,但其难度略大,标本观察效果略差。