克山病是一种地方性心肌病。大量的研究表明克山病病区人们处于低硒的环境,硒的一些生理作用和生化代谢过程对探讨克山病病因和发病机制有重要意义。但事实上,低硒地区不一定都流行克山病,缺硒者也未必都患克山病。为此我们采用质子激发 X 荧光分析法测量了四川省不同硒水平和克山病不同流行状况的四个地区近200名健康儿童的红血球中的微量元素含量。并探讨了它与克山病的关系。
The results of Moessbauer study of Apollo-17 Mare basalt are reported in this paper.It has been revealed that Fe in iron.bearing minerals in the basalt is almost present in the form of Fe^3+, with Fe^3+ less than 3% of total iron. The site occupancy of Fe^3+ ions at M1 and M2 is approximately 0.3 and the corresponding equilibrium constant K (T) is about 0.06, thus indicating that the mare basalt is formed through crystallization under high-temperature reducing and rather slow cooling conditions.
