Biomass and net primary productivity （NPP） are two important parameters in determining ecosystem carbon pool and carbon sequestration. The biomass storage and NPP in desert shrubland of Artemisia ordosica on Ordos P...Biomass and net primary productivity （NPP） are two important parameters in determining ecosystem carbon pool and carbon sequestration. The biomass storage and NPP in desert shrubland of Artemisia ordosica on Ordos Plateau were investigated with method of harvesting standard size shrub in the growing season （June-October） of 2006. Results indicated that above- and belowground biomass of the same size shrubs showed no significant variation in the growing season （p〉0.1）, but annual biomass varied significantly （p〈 0.01）. In the A. ordosica community, shrub biomass storage was 699.76-1246.40 g.m^-2 and annual aboveground NPP was 224.09 g-m^-2·a^-1. Moreover, shrub biomass and NPP were closely related with shrub dimensions （cover and height） and could be well predicted by shrub volume using power regression.展开更多
Nine lignans were isolated and purified by silica gel, ODS, Sephadex LH-20 column chromatographies, preparative HPLC and recrystallization from the aerial parts ofArtemisia absinthium L., and identified as follows： d...Nine lignans were isolated and purified by silica gel, ODS, Sephadex LH-20 column chromatographies, preparative HPLC and recrystallization from the aerial parts ofArtemisia absinthium L., and identified as follows： diayangambin （1）, sesartemin （2）, epiyangambin （3）, （＋）arborone （4）, （-）syringaresinol （5）, epiashchantin （6）, caruilignan C （7）, 7β-caruilignan C （8）, yangambin （9）. Compounds 4, 5, 7, 8 were isolated from this plant for the first time.展开更多
A phytochemical investigation on the aerial parts of Artemisia brachyloba led to the isolation of 13 compounds（1-13） for the first time, including eight lignans（1-8） and five flavonoids（9-13）. The structures of ...A phytochemical investigation on the aerial parts of Artemisia brachyloba led to the isolation of 13 compounds（1-13） for the first time, including eight lignans（1-8） and five flavonoids（9-13）. The structures of the isolated compounds were elucidated by analysis of the NMR spectroscopic data and comparison with the literature. The 1 H and 13 C NMR data of 1 were fully assigned for the first time by the 2 D NMR analysis. All the isolates were evaluated for their inhibitory effects on nitric oxide production in lipopolysaccharide-challenged BV-2 microglial cells.展开更多
基金National Natural Sciences Foundation of China (Nos. 40501072 and 40673067)the Major State Basic Research Develop-ment Program of China (No. 2002CB 412503)the Knowledge In-novation Program of the Institute of Geographic Sciences and Natural Resources Research,CAS "The effect of human activities on regional envi-ronmental quality, the health risk and the environmental remediation"
文摘Biomass and net primary productivity （NPP） are two important parameters in determining ecosystem carbon pool and carbon sequestration. The biomass storage and NPP in desert shrubland of Artemisia ordosica on Ordos Plateau were investigated with method of harvesting standard size shrub in the growing season （June-October） of 2006. Results indicated that above- and belowground biomass of the same size shrubs showed no significant variation in the growing season （p〉0.1）, but annual biomass varied significantly （p〈 0.01）. In the A. ordosica community, shrub biomass storage was 699.76-1246.40 g.m^-2 and annual aboveground NPP was 224.09 g-m^-2·a^-1. Moreover, shrub biomass and NPP were closely related with shrub dimensions （cover and height） and could be well predicted by shrub volume using power regression.
基金National Natural Science Foundation of China (Grant No. 30973629)
文摘Nine lignans were isolated and purified by silica gel, ODS, Sephadex LH-20 column chromatographies, preparative HPLC and recrystallization from the aerial parts ofArtemisia absinthium L., and identified as follows： diayangambin （1）, sesartemin （2）, epiyangambin （3）, （＋）arborone （4）, （-）syringaresinol （5）, epiashchantin （6）, caruilignan C （7）, 7β-caruilignan C （8）, yangambin （9）. Compounds 4, 5, 7, 8 were isolated from this plant for the first time.
基金National Natural Science Foundation of China(Grant No.81373294)National Key Technology R&D Program"New Drug Innovation"of China(Grant No.2018ZX09711001-008-003)
文摘A phytochemical investigation on the aerial parts of Artemisia brachyloba led to the isolation of 13 compounds（1-13） for the first time, including eight lignans（1-8） and five flavonoids（9-13）. The structures of the isolated compounds were elucidated by analysis of the NMR spectroscopic data and comparison with the literature. The 1 H and 13 C NMR data of 1 were fully assigned for the first time by the 2 D NMR analysis. All the isolates were evaluated for their inhibitory effects on nitric oxide production in lipopolysaccharide-challenged BV-2 microglial cells.
