The active compounds in herb drugs are mainly secondary metabolites, which are greatly influenced by external conditions. Particularly, light intensity has a great influence on the photosynthesis and accumulation of s...The active compounds in herb drugs are mainly secondary metabolites, which are greatly influenced by external conditions. Particularly, light intensity has a great influence on the photosynthesis and accumulation of secondary metabolites. In this study, the light intensity was changed, and the influence of the light intensity on leaf photosynthetic characteristics, antioxidant enzyme activity and flavone contents of Lithocarpus litseifoliusp (Hance) Chun. was discussed. The results showed that (1) L. litseifolius is a typical heliophyte. As the light intensity decreased, the contents of chlorophyll a (Chl a), chlorophyll b (Chl b) and total chlorophyll (Chl a + b) all increased. However, the Chl a/b ratio gradually decreased. The daily variation of net photosynthetic rate changed from a double-peak curve under natural light to single-peak curve under 20% full light two shading nets. (2) As the light intensity decreased, the SOD and POD activities and the soluble proteins content decreased in the leaves. In contrast, the malondialdehyde content increased. (3) The flavone content was the highest in leaves at one shading nets 60% of full light, and the lowest occurred in leaves at two shading nets 20% of full light. A comprehensive analysis indicated that an appropriate shading could induce shade tolerance in the leaves of L. litseifolius, which promoted the accumulation of flavonoids. L. litseifolius should be planted in the lower position of sunny slope or the upper position of shady slope to increase the content of flavone in the leaves.展开更多
紫斑牡丹品种群是中国的主要牡丹品种群之一。文中描述了一个优良紫斑牡丹品种‘挽春’(Paeoniarockii‘W an Chun’)的特征、习性和表现,该品种在紫斑牡丹品种群中具有代表性。紫斑牡丹品种可用于园艺观赏、经济林营造、荒山绿化以及...紫斑牡丹品种群是中国的主要牡丹品种群之一。文中描述了一个优良紫斑牡丹品种‘挽春’(Paeoniarockii‘W an Chun’)的特征、习性和表现,该品种在紫斑牡丹品种群中具有代表性。紫斑牡丹品种可用于园艺观赏、经济林营造、荒山绿化以及荒漠治理。根据多年的调查和相关文献,按照紫斑牡丹品种的生长适应程度和引种栽培难易程度,将中国有可能引种栽植紫斑牡丹品种的地区划分为4类。介绍了各类地区在引种栽培方面需要注意的关键技术措施,分析了紫斑牡丹品种向全国各地推广过程中存在的问题,并提出了建议。展开更多
A novel phenylpropanoid glycoside, Callicarposide A has been isolated from the aerial parts of Callicarpa kwangtungensis Chun. The chemical structure is elucidated on the basis of spectral analysis. C 2009 Teng Fei Ji...A novel phenylpropanoid glycoside, Callicarposide A has been isolated from the aerial parts of Callicarpa kwangtungensis Chun. The chemical structure is elucidated on the basis of spectral analysis. C 2009 Teng Fei Ji. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.展开更多
Chun Xiao, a famous Tang poetry, written by Meng Haoran, has been translated by some great translators. In translating poems, what is important is not only the transferring of the intended meaning of the source langua...Chun Xiao, a famous Tang poetry, written by Meng Haoran, has been translated by some great translators. In translating poems, what is important is not only the transferring of the intended meaning of the source language into target language, but keeping its literariness, i.e. the style of the original text. Three English versions are selected to make a comparative study from the perspective of reception aesthetics in terms of lexicon, rhyme and syntax.展开更多
Chunyu Yi(215 _(BC)-150 _(BC))once served as an official of granary in the Qi State.So he had a nickname of granary chief.His ancestral home was Linzi(present Linzi,Shandong Province).He was a celebrated practitioner ...Chunyu Yi(215 _(BC)-150 _(BC))once served as an official of granary in the Qi State.So he had a nickname of granary chief.His ancestral home was Linzi(present Linzi,Shandong Province).He was a celebrated practitioner of the Western Han Dynasty.His 25 case records,the extant earliest ones in China,were listed in The His-torical Records(Shi Ji).展开更多
The art of Wing Chun transcends geographical boundaries and cultural differences,with an impressive number of over 10 million practitioners spread across more than 80 countries and regions.This remarkable global reach...The art of Wing Chun transcends geographical boundaries and cultural differences,with an impressive number of over 10 million practitioners spread across more than 80 countries and regions.This remarkable global reach serves as a testament to its captivating allure and unparalleled ability to forge connections among individuals from diverse backgrounds.展开更多
文摘The active compounds in herb drugs are mainly secondary metabolites, which are greatly influenced by external conditions. Particularly, light intensity has a great influence on the photosynthesis and accumulation of secondary metabolites. In this study, the light intensity was changed, and the influence of the light intensity on leaf photosynthetic characteristics, antioxidant enzyme activity and flavone contents of Lithocarpus litseifoliusp (Hance) Chun. was discussed. The results showed that (1) L. litseifolius is a typical heliophyte. As the light intensity decreased, the contents of chlorophyll a (Chl a), chlorophyll b (Chl b) and total chlorophyll (Chl a + b) all increased. However, the Chl a/b ratio gradually decreased. The daily variation of net photosynthetic rate changed from a double-peak curve under natural light to single-peak curve under 20% full light two shading nets. (2) As the light intensity decreased, the SOD and POD activities and the soluble proteins content decreased in the leaves. In contrast, the malondialdehyde content increased. (3) The flavone content was the highest in leaves at one shading nets 60% of full light, and the lowest occurred in leaves at two shading nets 20% of full light. A comprehensive analysis indicated that an appropriate shading could induce shade tolerance in the leaves of L. litseifolius, which promoted the accumulation of flavonoids. L. litseifolius should be planted in the lower position of sunny slope or the upper position of shady slope to increase the content of flavone in the leaves.
文摘紫斑牡丹品种群是中国的主要牡丹品种群之一。文中描述了一个优良紫斑牡丹品种‘挽春’(Paeoniarockii‘W an Chun’)的特征、习性和表现,该品种在紫斑牡丹品种群中具有代表性。紫斑牡丹品种可用于园艺观赏、经济林营造、荒山绿化以及荒漠治理。根据多年的调查和相关文献,按照紫斑牡丹品种的生长适应程度和引种栽培难易程度,将中国有可能引种栽植紫斑牡丹品种的地区划分为4类。介绍了各类地区在引种栽培方面需要注意的关键技术措施,分析了紫斑牡丹品种向全国各地推广过程中存在的问题,并提出了建议。
文摘A novel phenylpropanoid glycoside, Callicarposide A has been isolated from the aerial parts of Callicarpa kwangtungensis Chun. The chemical structure is elucidated on the basis of spectral analysis. C 2009 Teng Fei Ji. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.
文摘Chun Xiao, a famous Tang poetry, written by Meng Haoran, has been translated by some great translators. In translating poems, what is important is not only the transferring of the intended meaning of the source language into target language, but keeping its literariness, i.e. the style of the original text. Three English versions are selected to make a comparative study from the perspective of reception aesthetics in terms of lexicon, rhyme and syntax.
文摘Chunyu Yi(215 _(BC)-150 _(BC))once served as an official of granary in the Qi State.So he had a nickname of granary chief.His ancestral home was Linzi(present Linzi,Shandong Province).He was a celebrated practitioner of the Western Han Dynasty.His 25 case records,the extant earliest ones in China,were listed in The His-torical Records(Shi Ji).
文摘The art of Wing Chun transcends geographical boundaries and cultural differences,with an impressive number of over 10 million practitioners spread across more than 80 countries and regions.This remarkable global reach serves as a testament to its captivating allure and unparalleled ability to forge connections among individuals from diverse backgrounds.
