为探究吕家坨井田地质构造格局,根据钻孔勘探资料,采用分形理论和趋势面分析方法,研究了井田7......

Since the discovery that selenium is an integral component of the active site of the mammalian glu-tathione peroxidase, ......

Selenium (Se) is an essential trace element in vivo. Its biological function is mainly exerted through selenoproteins. S......