In terms of photosynthetic efficiency,which demonstrates the space-time function of plant,niche width of B. platyphylla population was described.First,on the basis of net photosynthetic amount in certain time,the nich...In terms of photosynthetic efficiency,which demonstrates the space-time function of plant,niche width of B. platyphylla population was described.First,on the basis of net photosynthetic amount in certain time,the niche width of a birch was calculated.Then,the realized niche and rudimental niche of B. platyphylla seedlings,young trees and adult trees were discussed.Finally, the dynamic of niche under special conditions was studied.展开更多
The samples of licorice (Glycyrrhiza uralensis Fisch.) from 14 different cultivated areas were determined by the method of high Performance Capillary Electrophoresis (HPCE) for the contents of glycyrrihizic acid (GA) ...The samples of licorice (Glycyrrhiza uralensis Fisch.) from 14 different cultivated areas were determined by the method of high Performance Capillary Electrophoresis (HPCE) for the contents of glycyrrihizic acid (GA) in root. The results showed that the licorice plants come from various cultivated areas of China has different contents of GA. The GA content of licorice from Zhaodong in Heilongjiang Province is the highest, followed by those from E抰uoke, Chifeng, and Hangjin Banner in Inner Mongolia. Some suggestions for establishing the production base of licorice were put forward based on the study.展开更多
The determination method of 10-hydroxycamptothecin in Camptotheca acuminata fruits by high-performance liquid chromatogram (HPLC) was studied. The HPLC analysis was performed on a HIQ sil C18(4.6×250 mm) column w...The determination method of 10-hydroxycamptothecin in Camptotheca acuminata fruits by high-performance liquid chromatogram (HPLC) was studied. The HPLC analysis was performed on a HIQ sil C18(4.6×250 mm) column with mobile phase of acetonitrilewater (3:7, V:V), flow rate 1 mLmin-1 and UV detective wavelength 266 nm. Extracting 10-hydroxycamptothecin by ultrasonic method from fruits of C. acuminata to prepare samples for analysis was systematically discussed. The optimal extraction condition was carried out by 60% alcohol solution at 60℃ for 50 minutes.展开更多
The active oxygen content, MDA content and electrolyte leakage in the leaves of Betula platyphylla seedlings increased under the soil drought stress. Activity of cell defense enzymes changed markedly when the stress o...The active oxygen content, MDA content and electrolyte leakage in the leaves of Betula platyphylla seedlings increased under the soil drought stress. Activity of cell defense enzymes changed markedly when the stress of draught was intensified. SOD activity increased then decreased, POD activity decreased and CAT activity decreased then increased. All above physiological index returned to approach the normal level before stress after the water of soil was recovered.展开更多
文摘In terms of photosynthetic efficiency,which demonstrates the space-time function of plant,niche width of B. platyphylla population was described.First,on the basis of net photosynthetic amount in certain time,the niche width of a birch was calculated.Then,the realized niche and rudimental niche of B. platyphylla seedlings,young trees and adult trees were discussed.Finally, the dynamic of niche under special conditions was studied.
文摘The samples of licorice (Glycyrrhiza uralensis Fisch.) from 14 different cultivated areas were determined by the method of high Performance Capillary Electrophoresis (HPCE) for the contents of glycyrrihizic acid (GA) in root. The results showed that the licorice plants come from various cultivated areas of China has different contents of GA. The GA content of licorice from Zhaodong in Heilongjiang Province is the highest, followed by those from E抰uoke, Chifeng, and Hangjin Banner in Inner Mongolia. Some suggestions for establishing the production base of licorice were put forward based on the study.
基金This paper was supported by National Natural Science Foundation of China (No. 30070086).
文摘The determination method of 10-hydroxycamptothecin in Camptotheca acuminata fruits by high-performance liquid chromatogram (HPLC) was studied. The HPLC analysis was performed on a HIQ sil C18(4.6×250 mm) column with mobile phase of acetonitrilewater (3:7, V:V), flow rate 1 mLmin-1 and UV detective wavelength 266 nm. Extracting 10-hydroxycamptothecin by ultrasonic method from fruits of C. acuminata to prepare samples for analysis was systematically discussed. The optimal extraction condition was carried out by 60% alcohol solution at 60℃ for 50 minutes.
文摘The active oxygen content, MDA content and electrolyte leakage in the leaves of Betula platyphylla seedlings increased under the soil drought stress. Activity of cell defense enzymes changed markedly when the stress of draught was intensified. SOD activity increased then decreased, POD activity decreased and CAT activity decreased then increased. All above physiological index returned to approach the normal level before stress after the water of soil was recovered.
