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......

1,3-propanediol (1,3-PD) is an important material for chemical industry, and there has been always much interest in the ......

根据酶的结构与催化功能关系原理，提出了杂种优势的一种分子机理的假设，即杂合酶的协同效应，显性互补和异质等位基因互补是其中两个特......