In order to explore the effect mechanism of solvent on the synthesis of the metal organic framework materials, the microscopic interaction between solvent and framework and the effects of N,N-dimethyl-formamide(DMF) o...In order to explore the effect mechanism of solvent on the synthesis of the metal organic framework materials, the microscopic interaction between solvent and framework and the effects of N,N-dimethyl-formamide(DMF) or N-methyl- 2-pyrrolidone(NMP) on solvothermal synthesis of [Zn4O(BDC)3]8 were investigated through a combined DFT and experimental study. XRD and SEM showed that the absorbability of NMP in the pore of [Zn4O(BDC)3]8 was weaker than that of DMF. The thermal decomposition temperature of [Zn4O(BDC)3]8 synthesized in DMF was higher than that in NMP according to TG and FT-IR. In addition, the nitrogen sorption isotherms indicated that NMP improved gas sorption property of [Zn4O(BDC)3]8. The COSMO optimized calculations indicated that the total energy of Zn4O(BDC)3 in NMP was higher than that in DMF, and compared with non-solvent system, the charge of zinc atoms decreased and the charge value was the smallest in NMP. Furthermore, the interaction of DMF, NMP or DEF in [Zn4O(BDC)3]8 crystal model was calculated by DFT method. The results suggested that NMP should be easier to be removed from pore of materials than DMF from the point of view of energy state. It can be concluded that NMP was a favorable solvent to synthesize [Zn4O(BDC)3]8 and the microscopic mechanism was that the binding force between Zn4O(BDC)3 and NMP molecule was weaker than DMF.展开更多
目的:应用RNA干扰技术沉默肺癌A549细胞中PIN1(protein interacting with N1MA1)基因的表达,探讨其对A549细胞增殖、细胞周期和裸鼠成瘤能力的影响。方法:构建靶向PIN1基因的shRNA真核表达质粒pGPU6-GFP-Neo-PIN1和无义对照质粒pGPU6-GF...目的:应用RNA干扰技术沉默肺癌A549细胞中PIN1(protein interacting with N1MA1)基因的表达,探讨其对A549细胞增殖、细胞周期和裸鼠成瘤能力的影响。方法:构建靶向PIN1基因的shRNA真核表达质粒pGPU6-GFP-Neo-PIN1和无义对照质粒pGPU6-GFP-Neo,以脂质体法转染A549细胞,G418筛选稳定沉默PIN1基因的细胞株。Real-time PCR和Western blotting验证PIN1基因在mRNA和蛋白水平的表达,MTT法和流式细胞术检测A549细胞增殖和细胞周期分布。将稳定沉默PIN1的A549细胞与对照细胞皮下接种裸鼠,观察接种后肿瘤生长情况。结果:成功构建了pGPU6-GFP-Neo-PIN1载体,转染A549细胞并筛选获得稳定克隆。稳定转染pGPU6-GFP-Neo-PIN1的A549细胞中PIN1mRNA表达量较pGPU6-GFP-Neo转染组下降了89.3%;蛋白表达同时也显著抑制。PIN1基因沉默组的A549细胞增殖速率明显下降(P<0.01),细胞出现G1期阻滞。小鼠体内实验显示,PIN1沉默的A549细胞在裸鼠体内成瘤能力降低(P<0.01)。结论:pGPU6-GFP-Neo-PIN1质粒稳定转染肺癌A549细胞能有效沉默PIN1基因的表达,从而抑制A549细胞的增殖、影响细胞周期和抑制成瘤能力。展开更多
基金Project(51104185)supported by the National Natural Science Foundation of ChinaProject(2010QZZD003)supported by the Key Project of Central South University of Fundamental Research Funds for the Central Universities of China
文摘In order to explore the effect mechanism of solvent on the synthesis of the metal organic framework materials, the microscopic interaction between solvent and framework and the effects of N,N-dimethyl-formamide(DMF) or N-methyl- 2-pyrrolidone(NMP) on solvothermal synthesis of [Zn4O(BDC)3]8 were investigated through a combined DFT and experimental study. XRD and SEM showed that the absorbability of NMP in the pore of [Zn4O(BDC)3]8 was weaker than that of DMF. The thermal decomposition temperature of [Zn4O(BDC)3]8 synthesized in DMF was higher than that in NMP according to TG and FT-IR. In addition, the nitrogen sorption isotherms indicated that NMP improved gas sorption property of [Zn4O(BDC)3]8. The COSMO optimized calculations indicated that the total energy of Zn4O(BDC)3 in NMP was higher than that in DMF, and compared with non-solvent system, the charge of zinc atoms decreased and the charge value was the smallest in NMP. Furthermore, the interaction of DMF, NMP or DEF in [Zn4O(BDC)3]8 crystal model was calculated by DFT method. The results suggested that NMP should be easier to be removed from pore of materials than DMF from the point of view of energy state. It can be concluded that NMP was a favorable solvent to synthesize [Zn4O(BDC)3]8 and the microscopic mechanism was that the binding force between Zn4O(BDC)3 and NMP molecule was weaker than DMF.
