抗病硬米恢复系粤良恢5511的选育及繁种技术要点

含有抗稻瘟病pi-2基因和抗白叶枯病xa23基因的新型恢复系粤良恢5511,是通过广恢3550//粤恢9822///广恢3550采用谱法及分子标记相结合技术进行定向选育的,高抗稻瘟病、抗白叶枯病的硬米型水稻常规品种。本文以华南广适性恢复系资源与含有多个已标记抗病基因的新型恢复系进行杂交,通过系谱法及分子标记相结合技术进行定向选育,筛选出适应华南地区种植且抗病力强的硬米型种质资源,从而改善华南高产硬米种植区的用种结构已势在必行。

Structural,mechanical and electronic properties of precipitates in Mg−Zn alloys

To accelerate the development and design of magnesium(Mg)alloys,the structural and mechanical properties of important precipitates in Mg−Zn alloys were studied by experiments and density functional theory.The nano-indentation tests revealed that the hardness of the precipitates initially increased and then decreased with increasing Zn content,and was significantly higher than that of pure Mg and Zn.The calculation results revealed that the precipitates stability initially increased and then decreased with increasing Zn concentration.The bulk moduli of the precipitates increased,whereas their shear and Young’s moduli initially increased and then decreased with increasing Zn content.The decreasing order of ductility for these compounds is MgZn_(2)>Mg21Zn_(2)5>Mg2Zn11>Mg4Zn7.The surface profiles of the compounds revealed that they are obvious anisotropy.Both the degree of covalency and bond length of covalent bonds initially increased and then decreased with increasing Zn content.

“光威,萨第格!”

表弟邢建上个月从苏丹来信，再次向我讲述了那支光威渔竿的故事。他说的那支渔竿我知道，是光威SUPER FORCE雄水5．4米硬调渔竿，是我买了作为礼物出国时送他的。