The scalar of Japanese yew （Taxus cuspidata） population and the relationship between individual distribution and site factors were analyzed according to investigating data in 74 sample belts with a total sampled are...The scalar of Japanese yew （Taxus cuspidata） population and the relationship between individual distribution and site factors were analyzed according to investigating data in 74 sample belts with a total sampled area of 436.872 hm2 in Muling Nature Reserve. The result showed that the distribution rules of Japanese yew population were correlated to elevation, slope position, slope aspect and slope gradient. The optimal distribution range in elevation for the natural Japanese yew population is at the attitudes of 700-800 m. The amounts of Japanese yew individuals on shady slope were more than those on sunny slope. On top slope and mid-slope, the individual amounts of Japanese yew are more than those on toe slope. Most of Japanese yew individuals occurred on slope gradient of less than 15. The scalar of the population was decreased with the slope gradient increasing.展开更多
The Himalayan Yew (Taxus baccata subsp. wallichiana) is an endangered native high value medicinal plant of the Himalayan Region. The several medicinal properties of the bark and leaves of this species have increased i...The Himalayan Yew (Taxus baccata subsp. wallichiana) is an endangered native high value medicinal plant of the Himalayan Region. The several medicinal properties of the bark and leaves of this species have increased its risk of extinction due to pressures for utilization. It is also subjected to harvest for fuelwood. The species does not regenerate well from seed and that is another risk factor. The objective of this research was to investigate the population ecology of the species as a foundation for its conservation. Six forest communities in the Khokhan Wildlife Sanctuary where the species is present were sampled. The abundance of the species, impacts of harvesting and its current regeneration patterns indicate that it may soon be extirpated from the Sanctuary. A plan for conserving the remaining sub-populations is presented. It could provide a template for conservation in other locations where the species is at risk.展开更多
The extracts of yew tree have showed unique anti-tumor and anti-leakematic activities. Taxol extracted from it is effective against a variety of cancers, such as ovarian cancer and breast cancer. However the hypoglyce...The extracts of yew tree have showed unique anti-tumor and anti-leakematic activities. Taxol extracted from it is effective against a variety of cancers, such as ovarian cancer and breast cancer. However the hypoglycemic efficacy of the extract has not been reported yet, so the effects of oral administration of yew tree extracts on streptozotocin-induced diabetic rats were examined. Administration of shah tang ping （STP）, a fraction from the column separation of extract （450 mg/kg body weight）, for 14 days reduced the serum glucose concentrations of fasted diabetic rats by 52.4%. In addition, it also decreased the concentrations of triglyceride （TG）, total cholesterol （TC）, and low density lipoprotein cholesterol （LDL-C）. An oral glucose tolerance test （OGTT） was performed, a significant improvement in glucose tolerance was observed in rats treated with STP. These results suggest that STP has hypoglycemic properties and hypolipidemic action on streptozotocin-induced diabetic rats.展开更多
How can a man perform the role of a winner?He may be a scholar topping the study of a sub-ject,an engineer proficient in certain skills,an entrepreneur capable of creat-ing boundless wealth,a social worker working for...How can a man perform the role of a winner?He may be a scholar topping the study of a sub-ject,an engineer proficient in certain skills,an entrepreneur capable of creat-ing boundless wealth,a social worker working for the betterment of the so-展开更多
Paclitaxel in southern yew tree was quantitatively determined by high performance liquid chromatography (HPLC) with ODS-C18 column. A mixture of CH3OH-H2O-CH3COOH(volume ratio: 55 :44 :1) is used as mobile phase and U...Paclitaxel in southern yew tree was quantitatively determined by high performance liquid chromatography (HPLC) with ODS-C18 column. A mixture of CH3OH-H2O-CH3COOH(volume ratio: 55 :44 :1) is used as mobile phase and UV detection is carried out at 227 nm, and the column temperature is 20℃. The results show that there is a good linear felationship between the area of paclitaxel and the concentration of the sample in the range 50-500 mg/L for paclitaxel. The corresponding regression equation is Y= 13 021. 7 + 1. 01 × 106X, r=0. 9990. The average recovery is 95. 3% and the relative standard deviation is 2. 08%.展开更多
目的:研究东北红豆杉心材的化学成分。方法:采用硅胶柱色谱、制备薄层色谱和制备型高效液相色谱等手段对化学成分进行分离和纯化,用现代核磁技术对化合物进行结构鉴定。结果:从东北红豆杉心材分离得到10个化合物,分别鉴定为taxin ine(1)...目的:研究东北红豆杉心材的化学成分。方法:采用硅胶柱色谱、制备薄层色谱和制备型高效液相色谱等手段对化学成分进行分离和纯化,用现代核磁技术对化合物进行结构鉴定。结果:从东北红豆杉心材分离得到10个化合物,分别鉴定为taxin ine(1),taxusin(2),-βsitosterol(3),1-βhydroxybaccatin I(4),2,α5,α10β-triace-toxy-14β-(2-′m ethyl)butanoyloxy-4(20),11-taxad iene(5),2,α5,α10-βtriacetoxy-14-β(2-′m ethyl-3-′hydroxy-butanoy-loxy)-4(20),11-taxad iene(yunnanxane)(6),9,α10,β13α-triacetoxy-5-αc innamoyltaxa-4(20),11-d iene(7),2-deace-toxytaxin ine J(8),taxezop id ine G(9),2,α7,β9,α10,β13-αpentaacetoxyl-taxa-4(20),11-d ien-5-ol(5-dec innamoyltaxi-n ine J)(10)。结论:化合物4,6,10是首次从该植物中分离得到。展开更多
基金This work was supported by Northeast Forestry University fund Program from Science and Technology Department of Heilongjiang Province (LC05C14)
文摘The scalar of Japanese yew （Taxus cuspidata） population and the relationship between individual distribution and site factors were analyzed according to investigating data in 74 sample belts with a total sampled area of 436.872 hm2 in Muling Nature Reserve. The result showed that the distribution rules of Japanese yew population were correlated to elevation, slope position, slope aspect and slope gradient. The optimal distribution range in elevation for the natural Japanese yew population is at the attitudes of 700-800 m. The amounts of Japanese yew individuals on shady slope were more than those on sunny slope. On top slope and mid-slope, the individual amounts of Japanese yew are more than those on toe slope. Most of Japanese yew individuals occurred on slope gradient of less than 15. The scalar of the population was decreased with the slope gradient increasing.
文摘The Himalayan Yew (Taxus baccata subsp. wallichiana) is an endangered native high value medicinal plant of the Himalayan Region. The several medicinal properties of the bark and leaves of this species have increased its risk of extinction due to pressures for utilization. It is also subjected to harvest for fuelwood. The species does not regenerate well from seed and that is another risk factor. The objective of this research was to investigate the population ecology of the species as a foundation for its conservation. Six forest communities in the Khokhan Wildlife Sanctuary where the species is present were sampled. The abundance of the species, impacts of harvesting and its current regeneration patterns indicate that it may soon be extirpated from the Sanctuary. A plan for conserving the remaining sub-populations is presented. It could provide a template for conservation in other locations where the species is at risk.
文摘The extracts of yew tree have showed unique anti-tumor and anti-leakematic activities. Taxol extracted from it is effective against a variety of cancers, such as ovarian cancer and breast cancer. However the hypoglycemic efficacy of the extract has not been reported yet, so the effects of oral administration of yew tree extracts on streptozotocin-induced diabetic rats were examined. Administration of shah tang ping （STP）, a fraction from the column separation of extract （450 mg/kg body weight）, for 14 days reduced the serum glucose concentrations of fasted diabetic rats by 52.4%. In addition, it also decreased the concentrations of triglyceride （TG）, total cholesterol （TC）, and low density lipoprotein cholesterol （LDL-C）. An oral glucose tolerance test （OGTT） was performed, a significant improvement in glucose tolerance was observed in rats treated with STP. These results suggest that STP has hypoglycemic properties and hypolipidemic action on streptozotocin-induced diabetic rats.
文摘How can a man perform the role of a winner?He may be a scholar topping the study of a sub-ject,an engineer proficient in certain skills,an entrepreneur capable of creat-ing boundless wealth,a social worker working for the betterment of the so-
基金Project (00KNY1010 ) supported by the Key Program of Science and Technology Office of Hunan Province
文摘Paclitaxel in southern yew tree was quantitatively determined by high performance liquid chromatography (HPLC) with ODS-C18 column. A mixture of CH3OH-H2O-CH3COOH(volume ratio: 55 :44 :1) is used as mobile phase and UV detection is carried out at 227 nm, and the column temperature is 20℃. The results show that there is a good linear felationship between the area of paclitaxel and the concentration of the sample in the range 50-500 mg/L for paclitaxel. The corresponding regression equation is Y= 13 021. 7 + 1. 01 × 106X, r=0. 9990. The average recovery is 95. 3% and the relative standard deviation is 2. 08%.
文摘目的:研究东北红豆杉心材的化学成分。方法:采用硅胶柱色谱、制备薄层色谱和制备型高效液相色谱等手段对化学成分进行分离和纯化,用现代核磁技术对化合物进行结构鉴定。结果:从东北红豆杉心材分离得到10个化合物,分别鉴定为taxin ine(1),taxusin(2),-βsitosterol(3),1-βhydroxybaccatin I(4),2,α5,α10β-triace-toxy-14β-(2-′m ethyl)butanoyloxy-4(20),11-taxad iene(5),2,α5,α10-βtriacetoxy-14-β(2-′m ethyl-3-′hydroxy-butanoy-loxy)-4(20),11-taxad iene(yunnanxane)(6),9,α10,β13α-triacetoxy-5-αc innamoyltaxa-4(20),11-d iene(7),2-deace-toxytaxin ine J(8),taxezop id ine G(9),2,α7,β9,α10,β13-αpentaacetoxyl-taxa-4(20),11-d ien-5-ol(5-dec innamoyltaxi-n ine J)(10)。结论:化合物4,6,10是首次从该植物中分离得到。
