A novel dimeric coumarin (1), a dimeric of seselin named diseselin A, was isolated from the aerial part of Clausena lenis. The structure was elucidated based on the MS, 1D and 2D NMR data.
综合运用多种现代色谱分离技术对芸香科黄皮属植物光滑黄皮(Clausenalenis)枝叶90%乙醇提取物的石油醚萃取部位中的化学成分进行系统分离与纯化。结合化合物的理化性质和多种现代波谱鉴定技术,并通过与文献中报道的数据对照,鉴定了分离...综合运用多种现代色谱分离技术对芸香科黄皮属植物光滑黄皮(Clausenalenis)枝叶90%乙醇提取物的石油醚萃取部位中的化学成分进行系统分离与纯化。结合化合物的理化性质和多种现代波谱鉴定技术,并通过与文献中报道的数据对照,鉴定了分离得到7个化合物,分别为O-demethylmurrayanine (1)、clausine M (2)、clausine O (3)、indizoline (4)、clausenaline B (5)、excavatin D (6)和excavatin G (7)。化合物1~7均为首次从光滑黄皮中分离得到。展开更多
Lighting design is one of the fastest changing areas in building engineering. It has evolved significantly in recent years due to changing technology and demands for improved quality, better control, reduced energy an...Lighting design is one of the fastest changing areas in building engineering. It has evolved significantly in recent years due to changing technology and demands for improved quality, better control, reduced energy and sustainability. This paper is an overview of what is happening in Europe and elsewhere and examines the literature to find that latest recommendations in the Code for Lighting issued by the SLL （Society of Light and Lighting） in the UK change previous demands for equal illuminance across a working plane to more specific and demanding criteria. There are recommendations for qualitative metrics and better distribution of light so as to enhance the visual appearance of interiors. European standards are also examined and the LENI （lighting energy numerical indicator） has been found to be a better way of reducing energy than installed load. New LED （light-emitting diode） lamp technology is examined and daylight is discussed in the context of these changing demands. It is found that lighting standards and design are changing for the better but that standards will need to evolve further if they are to ensure good quality lighting.展开更多
基金supported by a grant from the National Natural Science Foundation of China(No.39525025 and No.30200350)
文摘A novel dimeric coumarin (1), a dimeric of seselin named diseselin A, was isolated from the aerial part of Clausena lenis. The structure was elucidated based on the MS, 1D and 2D NMR data.
文摘综合运用多种现代色谱分离技术对芸香科黄皮属植物光滑黄皮(Clausenalenis)枝叶90%乙醇提取物的石油醚萃取部位中的化学成分进行系统分离与纯化。结合化合物的理化性质和多种现代波谱鉴定技术,并通过与文献中报道的数据对照,鉴定了分离得到7个化合物,分别为O-demethylmurrayanine (1)、clausine M (2)、clausine O (3)、indizoline (4)、clausenaline B (5)、excavatin D (6)和excavatin G (7)。化合物1~7均为首次从光滑黄皮中分离得到。
文摘Lighting design is one of the fastest changing areas in building engineering. It has evolved significantly in recent years due to changing technology and demands for improved quality, better control, reduced energy and sustainability. This paper is an overview of what is happening in Europe and elsewhere and examines the literature to find that latest recommendations in the Code for Lighting issued by the SLL （Society of Light and Lighting） in the UK change previous demands for equal illuminance across a working plane to more specific and demanding criteria. There are recommendations for qualitative metrics and better distribution of light so as to enhance the visual appearance of interiors. European standards are also examined and the LENI （lighting energy numerical indicator） has been found to be a better way of reducing energy than installed load. New LED （light-emitting diode） lamp technology is examined and daylight is discussed in the context of these changing demands. It is found that lighting standards and design are changing for the better but that standards will need to evolve further if they are to ensure good quality lighting.
