Yb：YAG nanopowders were synthesized by the alcohol-water co-precipitatlon method adding MgO as sintering additives. Appropriate amount of MgO adding can restrict the agglomeration and reduce the particle size of Yb：...Yb：YAG nanopowders were synthesized by the alcohol-water co-precipitatlon method adding MgO as sintering additives. Appropriate amount of MgO adding can restrict the agglomeration and reduce the particle size of Yb：YAG powders. When the MgO content was 0.04wt%, well-dispersed Yb：YAG powders with ellipsoidal particles of less than 100 nm diameter were obtained. The experimental results showed the valence variation of doping ion Yb〉 would not appear when adding MgO as sintering additives, so ceramics showed colorless transparent instead of green due to Yb^2＋ color center using traditional SiO2 as additives. The transmission of the sintered Yb：YAG ceramics can reach 80.6% even without annealing. Ceramic morphology showed that the grains had uniform-distribution with the size of 10 iam or so, and no impurity and pore existed in the grain boundary and crystalline while using optimal sintering conditions.展开更多
目的:探讨中国汉族人群中维生素D受体(vitamin D receptor,VDR)基因ApaI(rs7975232)、BsmI(rs1544410)、TaqI(rs731236)、FokI(rs2228570)多态性与尿石症的关系。方法:尿石症患者212例和对照组250例纳入本研究。采用聚合酶链式反应限制...目的:探讨中国汉族人群中维生素D受体(vitamin D receptor,VDR)基因ApaI(rs7975232)、BsmI(rs1544410)、TaqI(rs731236)、FokI(rs2228570)多态性与尿石症的关系。方法:尿石症患者212例和对照组250例纳入本研究。采用聚合酶链式反应限制性片段长度多态性(polymerase chain reaction restriction fragment length polymorphism,PCR-RFLP)方法分析了VDR基因的4个多态性位点。结果:所有多态性位点在病例组与对照组中均符合遗传平衡定律。两组中BsmI和FokI位点多态性与中国汉族人群尿石症易感性相关。携带BsmIb等位基因者,其尿钙排泄水平明显升高。结论:BsmI和FokI位点基因多态性与中国汉族人群尿石症的发生相关,BsmI的b等位基因与尿石症患者的高尿钙排泄有关。展开更多
基金Funded by the National Natural Science Foundation of China(Nos.50872083,51002098and11145006)the Doctoral Program of Higher Education(No.20090181120092)the National High Technology Research and Development Program(863)(JG2011094)
文摘Yb：YAG nanopowders were synthesized by the alcohol-water co-precipitatlon method adding MgO as sintering additives. Appropriate amount of MgO adding can restrict the agglomeration and reduce the particle size of Yb：YAG powders. When the MgO content was 0.04wt%, well-dispersed Yb：YAG powders with ellipsoidal particles of less than 100 nm diameter were obtained. The experimental results showed the valence variation of doping ion Yb〉 would not appear when adding MgO as sintering additives, so ceramics showed colorless transparent instead of green due to Yb^2＋ color center using traditional SiO2 as additives. The transmission of the sintered Yb：YAG ceramics can reach 80.6% even without annealing. Ceramic morphology showed that the grains had uniform-distribution with the size of 10 iam or so, and no impurity and pore existed in the grain boundary and crystalline while using optimal sintering conditions.
文摘目的:探讨中国汉族人群中维生素D受体(vitamin D receptor,VDR)基因ApaI(rs7975232)、BsmI(rs1544410)、TaqI(rs731236)、FokI(rs2228570)多态性与尿石症的关系。方法:尿石症患者212例和对照组250例纳入本研究。采用聚合酶链式反应限制性片段长度多态性(polymerase chain reaction restriction fragment length polymorphism,PCR-RFLP)方法分析了VDR基因的4个多态性位点。结果:所有多态性位点在病例组与对照组中均符合遗传平衡定律。两组中BsmI和FokI位点多态性与中国汉族人群尿石症易感性相关。携带BsmIb等位基因者,其尿钙排泄水平明显升高。结论:BsmI和FokI位点基因多态性与中国汉族人群尿石症的发生相关,BsmI的b等位基因与尿石症患者的高尿钙排泄有关。
