GEOPHYSICS: Enhanced: Earth's Enigmatic Interface

At the boundary between Earth's mantle and its core, physical properties such as density change dramatically. In their Perspective, Garnero and Jeanloz discuss the competing models of this boundary's structure. Distinguishing between the models will require more high-quality seismic data.     

菲牛蛭的人工养殖方式试验

\t\t\t\t\t目的\t\t\t\t\t研究菲牛蛭蛭体氨基酸与蛋白饲料原料氨基酸平衡,为菲牛蛭氨基酸平衡饲料开发提供参考。\t\t\t\t\t\t\t\t\t\t\t\t\t方法\t\t\t\t\t采用高效液相柱前衍生方法测定菲牛蛭蛭体和11种蛋白饲料的氨基酸含量,通过灰色关联分析方法中的灰色关联度评价11种蛋白饲料与菲牛蛭蛭体氨基酸平衡程度。\t\t\t\t\t\t\t\t\t\t\t\t\t结果\t\t\t\t\t11种蛋白饲料与菲牛蛭蛭体氨基酸平衡的灰色关联度从高到低为牛肉粉>大豆浓缩蛋白>血浆蛋白粉>(猪肉粉=鸡肉粉)>(鱼粉>大豆分离蛋白)>血粉>血球蛋白粉>豆粕>全脂奶粉。\t\t\t\t\t\t\t\t\t\t\t\t\t结论\t\t\t\t\t牛肉粉、大豆浓缩蛋白、血浆蛋白粉、猪肉粉、鸡肉粉、鱼粉和大豆分离蛋白7种蛋白饲料原料与菲牛蛭蛭体氨基酸灰色关联度均在0.8以上,可优选作为开发菲牛蛭人工饲料的蛋白饲料原料。\t\t\t\t     

PLANETARY SCIENCE: Enhanced: Salty Old Rocks

Small grains of halite in meteorites are generally interpreted as a sign of the former presence of water. In his Perspective, Ott discusses the unexpected discovery of halites in relatively highly metamorphosed meteorites. According to the age determined by Whitby et al. for halite crystals in one of these meteorites, they are among the oldest known materials in the solar system.     

中国厚结猛蚁属记述(膜翅目 蚁科 猛蚁亚科)

首次对中国的厚结猛蚁属 (PachycondylaSmith)种类作全面报道 ,共记载1 7个种 .其中 ,邵氏厚结猛蚁 [P sauteri (Forel) ]为中国大陆新分布种 .编制了工蚁分种检索表 ,提供了各个种的简要描述和测量数据 .