随着信息技术、大数据等领域研究的进一步推进,可视化分析方法作为一种可以有效的呈现复杂网络结构并从中挖掘有用信息的方法而得到广泛应用。本文以Web of Science数据库及中国知网数据库中以CiteSpace为主题的文献为研究对象,展示当...随着信息技术、大数据等领域研究的进一步推进,可视化分析方法作为一种可以有效的呈现复杂网络结构并从中挖掘有用信息的方法而得到广泛应用。本文以Web of Science数据库及中国知网数据库中以CiteSpace为主题的文献为研究对象,展示当前相关研究的研究进展,并分析基于CiteSpace的可视化分析方法在医学领域的应用情况,为其进一步的应用提供思路。展开更多
Five compounds were isolated from the EtOH extraction of the stem of Amoora dasyclada (How et T.Chen) C.Y.Wu (Meliaceae). On the basis of spectroscopic methods, their structures were elucidated as 24, 25-epoxy-tirucal...Five compounds were isolated from the EtOH extraction of the stem of Amoora dasyclada (How et T.Chen) C.Y.Wu (Meliaceae). On the basis of spectroscopic methods, their structures were elucidated as 24, 25-epoxy-tirucall-7-ene-3, 23-dione (1),24,25,26,27-tetranortirucall-7-ene-3-oxo-23(21)-Iactone (2),taraxerone (3),taraxerol (4)and β-sitosterol (5).Among them, compound 1 was a new triterpenoid, compounds 3-5 were firstly obtained from this plant; compound 2,an tetranortriterpenoid, was firstly isolated from natural sources, and its NMR data were assigned for the first time. Moreover, the △^7-bond and the Me-14 in compound 2 were never changed, which has never been found in other tetranortriterpenoids. And the biosynthetic pathway of tetranortriterpenoid was further discussed.展开更多
文摘随着信息技术、大数据等领域研究的进一步推进,可视化分析方法作为一种可以有效的呈现复杂网络结构并从中挖掘有用信息的方法而得到广泛应用。本文以Web of Science数据库及中国知网数据库中以CiteSpace为主题的文献为研究对象,展示当前相关研究的研究进展,并分析基于CiteSpace的可视化分析方法在医学领域的应用情况,为其进一步的应用提供思路。
文摘Five compounds were isolated from the EtOH extraction of the stem of Amoora dasyclada (How et T.Chen) C.Y.Wu (Meliaceae). On the basis of spectroscopic methods, their structures were elucidated as 24, 25-epoxy-tirucall-7-ene-3, 23-dione (1),24,25,26,27-tetranortirucall-7-ene-3-oxo-23(21)-Iactone (2),taraxerone (3),taraxerol (4)and β-sitosterol (5).Among them, compound 1 was a new triterpenoid, compounds 3-5 were firstly obtained from this plant; compound 2,an tetranortriterpenoid, was firstly isolated from natural sources, and its NMR data were assigned for the first time. Moreover, the △^7-bond and the Me-14 in compound 2 were never changed, which has never been found in other tetranortriterpenoids. And the biosynthetic pathway of tetranortriterpenoid was further discussed.
