Protein 25a2 is the antifungal peptide of cotton Verticillium wilt which was isolated from Bacillus amyloliquefaciens. The amino acid sequence of antifungal peptide 25a2 was analyzed using bioinformatics tools, and th...Protein 25a2 is the antifungal peptide of cotton Verticillium wilt which was isolated from Bacillus amyloliquefaciens. The amino acid sequence of antifungal peptide 25a2 was analyzed using bioinformatics tools, and the characters of signal peptides, transmembrane topological structura, physicochemical signatures, protein domain, secondary and tertiary structure of protein were predicted. The results showed that 25a2 was a secreted protein, the sequence of which included a signal peptide in N end and a transmembrane domain in C end. The predicted secondary structure showed that the antibacterial peptide was mainly free random coils, belonging to mixed protein, three-dimensional model of 25a2 was a compact ball. These results showed that the most possible action mechanism of antifungal peptide 25a2 might be ＂carpet＂ model.展开更多
以La_2O_3和Ta_2O_5为原材料,采用固相反应法制备了La_2La Ta O_7粉体。用X射线衍射技术、扫描电子显微镜、EDS电子能谱分析了粉体的相结构,显微形貌和元素组成。用激光颗粒度仪和比表面积分析仪分析了粉体的颗粒度及表面积,用可见光照...以La_2O_3和Ta_2O_5为原材料,采用固相反应法制备了La_2La Ta O_7粉体。用X射线衍射技术、扫描电子显微镜、EDS电子能谱分析了粉体的相结构,显微形貌和元素组成。用激光颗粒度仪和比表面积分析仪分析了粉体的颗粒度及表面积,用可见光照射下亚甲基蓝的降解率分析了该粉体的光催化活性。结果表明,本文成功合成了纯净具有单一氟铝镁钠石结构的La_2La Ta O_7粉体,粉体具有明显的团聚现象,其平均颗粒度约为24μm,比表面积仅为0.463 m^2/g。经过150 min照射后,该粉体对亚甲基蓝的降解率达到68%,其较低的降解率可能与其较低的比表面积有关。展开更多
文摘Protein 25a2 is the antifungal peptide of cotton Verticillium wilt which was isolated from Bacillus amyloliquefaciens. The amino acid sequence of antifungal peptide 25a2 was analyzed using bioinformatics tools, and the characters of signal peptides, transmembrane topological structura, physicochemical signatures, protein domain, secondary and tertiary structure of protein were predicted. The results showed that 25a2 was a secreted protein, the sequence of which included a signal peptide in N end and a transmembrane domain in C end. The predicted secondary structure showed that the antibacterial peptide was mainly free random coils, belonging to mixed protein, three-dimensional model of 25a2 was a compact ball. These results showed that the most possible action mechanism of antifungal peptide 25a2 might be ＂carpet＂ model.
文摘以La_2O_3和Ta_2O_5为原材料,采用固相反应法制备了La_2La Ta O_7粉体。用X射线衍射技术、扫描电子显微镜、EDS电子能谱分析了粉体的相结构,显微形貌和元素组成。用激光颗粒度仪和比表面积分析仪分析了粉体的颗粒度及表面积,用可见光照射下亚甲基蓝的降解率分析了该粉体的光催化活性。结果表明,本文成功合成了纯净具有单一氟铝镁钠石结构的La_2La Ta O_7粉体,粉体具有明显的团聚现象,其平均颗粒度约为24μm,比表面积仅为0.463 m^2/g。经过150 min照射后,该粉体对亚甲基蓝的降解率达到68%,其较低的降解率可能与其较低的比表面积有关。
