目的观察纳米骨浆经成骨基因-人骨形态发生蛋白2（human bone morphogenetic protein 2，hBMP2）活化后是否具有异位诱导成骨能力。方法昆明种小鼠24只，4周龄，体重（20±2）g，随机分为两组。两组小鼠右侧大腿后群肌袋均注射纳米...目的观察纳米骨浆经成骨基因-人骨形态发生蛋白2（human bone morphogenetic protein 2，hBMP2）活化后是否具有异位诱导成骨能力。方法昆明种小鼠24只，4周龄，体重（20±2）g，随机分为两组。两组小鼠右侧大腿后群肌袋均注射纳米骨浆＋hBMP2质粒，作为实验侧；1组：左侧大腿后群肌袋注射纳米骨浆＋空白质粒，作为对照侧1；2组：左侧大腿后群肌袋注射纳米骨浆，作为对照侧2。术后2、4周，采用放射学、分子生物学和组织形态学等方法检测成骨基因hBMP2表达和诱导成骨效应。结果术后所有动物均存活，饮食活动正常。RT-PCR和Western blot检测发现术后2、4周实验侧注射材料组织有hBMP2表达。术后2周，实验侧植入材料出现大量软骨组织和呈岛状散在分布的骨组织，对照侧未见骨组织形成。术后4周，实验侧可见大量骨化组织，新生骨相互融合生长并形成较为成熟的板层骨和骨小梁结构；对照侧植入材料外周有较多纤维结缔组织，未见骨或软骨形成。术后2、4周，实验侧碱性磷酸酶活性均明显高于对照侧（P〈0．01），差异有统计学意义。结论纳米骨浆在hBMP2基因质粒活化后具有显著的骨诱导活性。展开更多
Uniform a-Fe203/amorphous TiO2 core-shell nanocomposites were prepared via a hydrolysis method anda-Fe2OJanatase TiO2 core-shell nanocomposites were obtained via a post-calcination process. The structure andmorphology...Uniform a-Fe203/amorphous TiO2 core-shell nanocomposites were prepared via a hydrolysis method anda-Fe2OJanatase TiO2 core-shell nanocomposites were obtained via a post-calcination process. The structure andmorphology of the products were characterized by powder X-ray diffraction, X-ray photoelectron spectroscopy,transmission electron microscopy and scanning electron microscopy. Amorphous TiO2 nanoparticles with diametersof ten to several tens nanometer were formed on the surface of a-Fe203 nanoparticles and the coverage density of thesecondary TiO2 nanoparticles in the composite can be controlled by varying the concentration of Ti（BuO）4 m theethanol solution. The visible-light photocatalytic properties of different products towards Rhodamine B（RhB） wereinvestigated. The results show that the a-Fe203/amorphous TiO2 exhibits a good photocatalytic property owing to theextension of the light response range to visible light and the efficient separation of photogenerated electrons and holesbetween a-Fe203 and amorphous TiO2.展开更多
Nanocrystalline powders of yttrium partially stabilized zirconia (YPSZ) are reprocessed into agglomerated feedstocks for plasma spraying thermal barrier coatings (TBCs), using the methods of ball milling, slurry dispe...Nanocrystalline powders of yttrium partially stabilized zirconia (YPSZ) are reprocessed into agglomerated feedstocks for plasma spraying thermal barrier coatings (TBCs), using the methods of ball milling, slurry dispersion, spray drying, and heat treatment. Atmospheric plasma is used to spray the agglomerated nanocrystalline particle feedstocks and coatings were deposited on the substrate of Ni-based superalloy. Scanning electron microscopy (SEM) is used to examine the morphology and cross-section of the agglomerated feedstocks and the free-section and cross-section of the nanostructured TBCs. Experimental results show that the agglomerated nanocrystalline particles are spherical and dense. Unlike conventional plasma-sprayed coatings, the micron/nano/micron sandwich structure can be found in the nanostructured YPSZ coatings deposited by atmospheric plasma spraying.展开更多
文摘目的观察纳米骨浆经成骨基因-人骨形态发生蛋白2（human bone morphogenetic protein 2，hBMP2）活化后是否具有异位诱导成骨能力。方法昆明种小鼠24只，4周龄，体重（20±2）g，随机分为两组。两组小鼠右侧大腿后群肌袋均注射纳米骨浆＋hBMP2质粒，作为实验侧；1组：左侧大腿后群肌袋注射纳米骨浆＋空白质粒，作为对照侧1；2组：左侧大腿后群肌袋注射纳米骨浆，作为对照侧2。术后2、4周，采用放射学、分子生物学和组织形态学等方法检测成骨基因hBMP2表达和诱导成骨效应。结果术后所有动物均存活，饮食活动正常。RT-PCR和Western blot检测发现术后2、4周实验侧注射材料组织有hBMP2表达。术后2周，实验侧植入材料出现大量软骨组织和呈岛状散在分布的骨组织，对照侧未见骨组织形成。术后4周，实验侧可见大量骨化组织，新生骨相互融合生长并形成较为成熟的板层骨和骨小梁结构；对照侧植入材料外周有较多纤维结缔组织，未见骨或软骨形成。术后2、4周，实验侧碱性磷酸酶活性均明显高于对照侧（P〈0．01），差异有统计学意义。结论纳米骨浆在hBMP2基因质粒活化后具有显著的骨诱导活性。
文摘Uniform a-Fe203/amorphous TiO2 core-shell nanocomposites were prepared via a hydrolysis method anda-Fe2OJanatase TiO2 core-shell nanocomposites were obtained via a post-calcination process. The structure andmorphology of the products were characterized by powder X-ray diffraction, X-ray photoelectron spectroscopy,transmission electron microscopy and scanning electron microscopy. Amorphous TiO2 nanoparticles with diametersof ten to several tens nanometer were formed on the surface of a-Fe203 nanoparticles and the coverage density of thesecondary TiO2 nanoparticles in the composite can be controlled by varying the concentration of Ti（BuO）4 m theethanol solution. The visible-light photocatalytic properties of different products towards Rhodamine B（RhB） wereinvestigated. The results show that the a-Fe203/amorphous TiO2 exhibits a good photocatalytic property owing to theextension of the light response range to visible light and the efficient separation of photogenerated electrons and holesbetween a-Fe203 and amorphous TiO2.
文摘Nanocrystalline powders of yttrium partially stabilized zirconia (YPSZ) are reprocessed into agglomerated feedstocks for plasma spraying thermal barrier coatings (TBCs), using the methods of ball milling, slurry dispersion, spray drying, and heat treatment. Atmospheric plasma is used to spray the agglomerated nanocrystalline particle feedstocks and coatings were deposited on the substrate of Ni-based superalloy. Scanning electron microscopy (SEM) is used to examine the morphology and cross-section of the agglomerated feedstocks and the free-section and cross-section of the nanostructured TBCs. Experimental results show that the agglomerated nanocrystalline particles are spherical and dense. Unlike conventional plasma-sprayed coatings, the micron/nano/micron sandwich structure can be found in the nanostructured YPSZ coatings deposited by atmospheric plasma spraying.
