Objective: To extract and identify the main constituents of the essential oil of Cotula cinerea(Del.)(Asteraceae family) from southwest of Algeria.Methods: The essential oils obtained by hydrodistillation, from the ae...Objective: To extract and identify the main constituents of the essential oil of Cotula cinerea(Del.)(Asteraceae family) from southwest of Algeria.Methods: The essential oils obtained by hydrodistillation, from the aerial parts of the endemic plant Cotula cinerea which was collected in the region of Sahara from southwest of Algeria, were analyzed by gas chromatography-mass spectrometry.Results: A total of 33 compounds were identified representing 98.66% of the oil. The main compounds were(E)-citral(24.01%), limonene epoxide cis-(18.26%), thymol methyl ether(15.04%), carvacrol(15.03%), trans-carveol(13.79%), carvone(3.06%) and trans-piperitol(2.54%).Conclusions: The main constituents in essential oil of the aerial part of the plant from southwest of Algeria were different from that collected from southeast of Algeria or in Morocco.展开更多
In order to reveal the characteristics of land use change in the south loess plateau,this paper tentatively divided Loess Plateau into North and South under the support of GIS,and then introduced land use spatial temp...In order to reveal the characteristics of land use change in the south loess plateau,this paper tentatively divided Loess Plateau into North and South under the support of GIS,and then introduced land use spatial temporal dynamic model,analyzed land use dynamic change in provincial scale. The results showed: during the 25 years,construction land area increased from 3 555. 99 km2 to 4 794. 28 km2,unused land decreased by 0. 02 percentage points,forest land area increased from 51 011. 31 km2 to 51 066. 79 km2,waters increased of 0. 01 percentage points,farmland area decreased to 98 561. 57 km2 from 100 004. 79 km2,grassland area increased by 0.08 percentage points. Land use change important values in province scale on each were not identical,showed obvious regional differences.展开更多
Golden Dragon Copper Tube Group Inc’s cop- per tube factory in Mexican is expected to be put into operation around May and June in 2009.At that time, the factory,with an annual processing capacity of 80,000 tons will
Lianhe Chemical Technology Co.,Ltd.(SZ:002250,Lianhe Chemical) was establishedin 1985 and headquartered in Taizhou,Zhejiang province in southeastern China.It has many subsidiaries in Taizhou,Shanghaiand Yancheng,Jiang...Lianhe Chemical Technology Co.,Ltd.(SZ:002250,Lianhe Chemical) was establishedin 1985 and headquartered in Taizhou,Zhejiang province in southeastern China.It has many subsidiaries in Taizhou,Shanghaiand Yancheng,Jiangsu province.LianheChemical is mainly engaged in the productionof fine chemicals that are used inpharmaceuticals,pesticides and otherindustries.More than 80% of its productsare exported to abroad.展开更多
文摘Objective: To extract and identify the main constituents of the essential oil of Cotula cinerea(Del.)(Asteraceae family) from southwest of Algeria.Methods: The essential oils obtained by hydrodistillation, from the aerial parts of the endemic plant Cotula cinerea which was collected in the region of Sahara from southwest of Algeria, were analyzed by gas chromatography-mass spectrometry.Results: A total of 33 compounds were identified representing 98.66% of the oil. The main compounds were(E)-citral(24.01%), limonene epoxide cis-(18.26%), thymol methyl ether(15.04%), carvacrol(15.03%), trans-carveol(13.79%), carvone(3.06%) and trans-piperitol(2.54%).Conclusions: The main constituents in essential oil of the aerial part of the plant from southwest of Algeria were different from that collected from southeast of Algeria or in Morocco.
基金Supported by National Natural Science Foundation of China(41271159)Research Training Fund of Xi'an University of Technology(201103)+1 种基金Doctor Startup Fund of Xi'an University of Technology(2011QDJ036)National College Students' Innovation and Entrepreneurship Training Program(201210704006)
文摘In order to reveal the characteristics of land use change in the south loess plateau,this paper tentatively divided Loess Plateau into North and South under the support of GIS,and then introduced land use spatial temporal dynamic model,analyzed land use dynamic change in provincial scale. The results showed: during the 25 years,construction land area increased from 3 555. 99 km2 to 4 794. 28 km2,unused land decreased by 0. 02 percentage points,forest land area increased from 51 011. 31 km2 to 51 066. 79 km2,waters increased of 0. 01 percentage points,farmland area decreased to 98 561. 57 km2 from 100 004. 79 km2,grassland area increased by 0.08 percentage points. Land use change important values in province scale on each were not identical,showed obvious regional differences.
文摘Golden Dragon Copper Tube Group Inc’s cop- per tube factory in Mexican is expected to be put into operation around May and June in 2009.At that time, the factory,with an annual processing capacity of 80,000 tons will
文摘Lianhe Chemical Technology Co.,Ltd.(SZ:002250,Lianhe Chemical) was establishedin 1985 and headquartered in Taizhou,Zhejiang province in southeastern China.It has many subsidiaries in Taizhou,Shanghaiand Yancheng,Jiangsu province.LianheChemical is mainly engaged in the productionof fine chemicals that are used inpharmaceuticals,pesticides and otherindustries.More than 80% of its productsare exported to abroad.
