A new skeleton taxane diterpene,taxayuntin,was isolated from the leaves and stems of Taxus yunnanensis.Its structure was determined by spectroscopic methods(MS,~1H NMR,^(13)C NMR, ~1H-~1H COSY,~1H-^(13)C COSY and ^(13...A new skeleton taxane diterpene,taxayuntin,was isolated from the leaves and stems of Taxus yunnanensis.Its structure was determined by spectroscopic methods(MS,~1H NMR,^(13)C NMR, ~1H-~1H COSY,~1H-^(13)C COSY and ^(13)C-~1H COLOC)and X-ray diffraction.展开更多
a new triterpene compound was isolated from the stems and leaves of Panax ginseng C. A. Meyer and established as 3β, 6α, 12β-trihydroxy-dammar-20(21), 24-diene-6-0-α-L-rhamnopyranosyl-(1→2)-β-D-glucopyranoside o...a new triterpene compound was isolated from the stems and leaves of Panax ginseng C. A. Meyer and established as 3β, 6α, 12β-trihydroxy-dammar-20(21), 24-diene-6-0-α-L-rhamnopyranosyl-(1→2)-β-D-glucopyranoside on the basis of spectral analysis and chemical evidence.展开更多
How long should paid maternity leave be？ Three months？ Six months？ A year？ Or three whole years？ Though Chinese laws and regulations allow 98 days of maternity leave, Zhang Lihui, a member of the 12th National C...How long should paid maternity leave be？ Three months？ Six months？ A year？ Or three whole years？ Though Chinese laws and regulations allow 98 days of maternity leave, Zhang Lihui, a member of the 12th National Committee of the Chinese People＇s Political Consultative Conference, suggested that the entitlement be increased to three years, until the newborns are old enough to be sent to kindergarten. According to Zhang, this would not only meet the psychological and educational needs of children, but also help mothers work more efficiently in the future as they do not need to worry too much about their children.展开更多
文摘A new skeleton taxane diterpene,taxayuntin,was isolated from the leaves and stems of Taxus yunnanensis.Its structure was determined by spectroscopic methods(MS,~1H NMR,^(13)C NMR, ~1H-~1H COSY,~1H-^(13)C COSY and ^(13)C-~1H COLOC)and X-ray diffraction.
文摘a new triterpene compound was isolated from the stems and leaves of Panax ginseng C. A. Meyer and established as 3β, 6α, 12β-trihydroxy-dammar-20(21), 24-diene-6-0-α-L-rhamnopyranosyl-(1→2)-β-D-glucopyranoside on the basis of spectral analysis and chemical evidence.
文摘How long should paid maternity leave be？ Three months？ Six months？ A year？ Or three whole years？ Though Chinese laws and regulations allow 98 days of maternity leave, Zhang Lihui, a member of the 12th National Committee of the Chinese People＇s Political Consultative Conference, suggested that the entitlement be increased to three years, until the newborns are old enough to be sent to kindergarten. According to Zhang, this would not only meet the psychological and educational needs of children, but also help mothers work more efficiently in the future as they do not need to worry too much about their children.
