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Search Results: 1 - 10 of 75371 matches for " Chong-Ren Yang "
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Chemotaxonomic Study on the Family of Lardizabalaceae

ZHENG Qing-An YANG Chong-Ren,

植物学报 , 2001,
Abstract: The Ladizabalaceae is a relatively primitive small family in the Dicotyledoneae. It is composed mainly of monotypic and oligotypic genera and is distributed mainly in eastern Asia. There are 29 species of 7 genera in China, some of which are used as traditional herbs. Based on the brief summary of taxonomic and chemical research results, the present paper discusses the chemotaxonomy of this family. It is noticed that oleanane triterpenoidal saponins are characteristic constituents of this family and have taxonomic significance. The distribution of triterpenoidal saponins in the plants of Ladizabalaceae suggests the phylogenetic relation between Lardizabalaceae and Ranunculoideae of Ranunculaceae. Moreover, the oxidative level of triterpenoidal aglycone may also imply evolutionary relations among the genera of the family.
Review on “Long-Dan”, one of the traditional Chinese medicinal herbs recorded in Chinese pharmacopoeia
Yan-Ming Wang,Min Xu,Dong Wang,Hong-Tao Zhu,Chong-Ren Yang,Ying-Jun Zhang
Natural Products and Bioprospecting , 2012, DOI: 10.1007/s13659-011-0043-3
Abstract: “Long-Dan” is an important traditional Chinese medicinal (TCM) herb used widely for the treatment of inflammation, hepatitis, rheumatism, cholecystitis, and tuberculosis. In the Chinese Pharmacopoeia, the roots and rhizomes of four species from the genus Gentiana (Gentianaceae) are recorded as the original materials of “Long-Dan”, called Gentianae Radix et Rhizoma. The species included G. manshurica, G. scabra, G. triflora and G. rigescens, which are distributed in different areas of China. Though iridoid and secoiridoid glucosides were reported as the main constituents in “Long-Dan”, these four different species also resulted in different minor components, which may related to their pharmacological activities. Herein, we summarized the herbal textual study, distribution, chemical constituents, biological investigation and quality control of the recorded “Long-Dan” origins in Chinese Pharmacopoeia during the period 1960 to 2011.
Dammarane-type saponins from steamed leaves of Panax Notoginseng
Qing Liu,Jun-Jiang Lv,Min Xu,Dong Wang,Hong-Tao Zhu,Chong-Ren Yang,Ying-Jun Zhang
Natural Products and Bioprospecting , 2011, DOI: 10.1007/s13659-011-0036-2
Abstract: Four new dammarane-type triterpenoid saponins, namely notoginsenosides SFt1-SFt4 (1–4) were isolated from the steamed leaves of Panax notoginseng (Burk.) F. H. Chen (Araliaceae), together with 17 known saponins. Their structures were established on the basis of detailed spectroscopic analyses and acidic hydrolysis. The known ginsenosides Rk2 and Rh3 were obtained from P. notoginseng for the first time. All of these new saponins showed no in vitro cytotoxicity against five human cancer cell lines (HL-60, SMMC-7712, A-549, MCF-7, and SW480).
Flavonoid oligomers from Chinese dragon’s blood, the red resins of Dracaena cochinchinensis
Qing-An Zheng,Min Xu,Chong-Ren Yang,Dong Wang,Hai-Zhou Li,Hong-Tao Zhu,Ying-Jun Zhang
Natural Products and Bioprospecting , 2012, DOI: 10.1007/s13659-012-0020-5
Abstract: A detailed chemical investigation of the red resins from Dracaena cochinchinensis (Chinese dragon’s blood) yielded five new flavonoid oligomers, named cochinchinenins D-H (1–5), together with a known biflavonoid, cinnabarone (6), and a mixture of two known biflavonoids, socotrin-4′-ol (7) and homoisosocotrin-4′-ol (8). Of these new compounds, 1–3 were biflavonoids and 4 and 5 were triflavonoids. Their structures were determined on the basis of spectroscopic analysis. The isolated compounds were tested for cytotoxicity (Cdc25), antibacterial (PEPT) and antifungal (YNG) activities.
The chemical constituents from the roots of Gentiana crassicaulis and their inhibitory effects on inflammatory mediators NO and TNF-α
Tao Lv,Min Xu,Dong Wang,Hong-Tao Zhu,Chong-Ren Yang,Tian-Tai Zhang,Ying-Jun Zhang
Natural Products and Bioprospecting , 2012, DOI: 10.1007/s13659-012-0067-3
The Chemotaxonomy of Chinese Species of the Genus Aconitum L. (Ranunculaceae)

Hao Xiao-Jiang,Yang Chong-Ren,Chen Sze-Ying,Zhou Jun,

中国科学院研究生院学报 , 1985,
Abstract: On the basis of biosynthsis, distribution of diterpenoid alkaloids as well as morphological evolution of Chinese species L. (Ranunculaceae), chemotaxonomy of the genus Aconitum is discussed: 1, Subgen. Lycoctonum, containing lycoctonine-type alkaloids and Subgen. Aconi- tum containing aconitine-type alkaloids, were probably differetiated at the early stage of evolution of the genus Aconitum and evolved respectively in their own ways. 2, In Subgen. Aconitum: (1) Ser. Bullatifolia, containing mainly atisine-, veat- chine-type alkaloids, and amino, alcohol and ester base of aconitine-type, and distribu- ted in Hengduan Mountain and Jingsha River valley, where is the centre of modern differentiation of species of Aconitum, is probably a series from which Chinese species of the genus Aconitum were derived; (2) Ser. Inflata, containing mainly aconitine, mesaconitine and bypaconitine, is an advanced group; (3) Ser. Grsndituberosa, conta- ining mainly aconitine and songorine, is related to Ser. Bulatifolia; (4) Ser. stylosa and Ser. volubilia, containing mainly yunaconitine and other anisyl ester alkaloids form another advanced branch. 3, Ser. Tangutica and A. naviculare of Ser. Rotaundifolia, containing atisine and lactone-type alkaloids may be a specialized group in high mountains and have occurred at early stage of evolution of the genus Aconitum. 4, Subgen. Gymnaconitum, containing atisine-type alkaloids and amino alcohol of aconitine type, may als be a specialized group in high mountains. 5, A. franchetii Finet. et Gagnep. mainly containing ester bases of aconitine-typeand closed to A. chasmanthum Stapf, is best placed into Ser. Ambigua.
Liouville theorem for Pseudoharmonic maps from Sasakian manifolds
Yibin Ren,Guilin Yang,Tian Chong
Mathematics , 2013, DOI: 10.1016/j.geomphys.2014.03.004
Abstract: In this paper, we derive a sub-gradient estimate for pseudoharmonic maps from noncompact complete Sasakian manifolds which satisfy CR sub-Laplace comparison property, to simply-connected Riemannian manifolds with nonpositive sectional curvature. As its application, we obtain some Liouville theorems for pseudoharmonic maps. In the Appendix, we modify the method and apply it to harmonic maps from noncompact complete Sasakian manifolds.
On harmonic and pseudoharmonic maps from strictly pseudoconvex CR manifolds
Tian Chong,Yuxin Dong,Yibin Ren,Guilin Yang
Mathematics , 2015,
Abstract: In this paper, we give some rigidity results for both harmonic and pseudoharmonic maps from CR manifolds into Riemannian manifolds or Kahler manifolds. Some basicity, pluriharmonicity and Siu-Sampson type results are established for both harmonic maps and pseudoharmonic maps.
Research on PPP Mode in Ecological Governance in China  [PDF]
Pingping Sun, Chong Ren
Open Journal of Social Sciences (JSS) , 2017, DOI: 10.4236/jss.2017.56016
Abstract: The research explores the cause of the inefficiency of the traditional ecological management model by analyzing the fragmentation of internal governance structure and the marginalization of external governance subjects. Then, on the basis of the core concept of PPP model, taking the current new normal economy into consideration, the research analyzes the necessity and feasibility of introducing the PPP model in the field of ecological governance in china. Finally, the implementation path of the ecological management PPP model is discussed in three aspects—the promotion for the implementation of the PPP project, risk management in PPP project and performance evaluation of PPP project.
Chong-Gui Ren
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810009645
Abstract: There are two independent molecules in the asymmetric unit of the title compound, C15H12Cl2N2O2. The dihedral angle between the two benzene rings is 27.6 (4)° in one molecule and 16.4 (4)° in the other. Both molecules adopt an E configuration about the C=N bonds. In the crystal structure, molecules are linked through intermolecular N—H...O hydrogen bonds, forming chains in the a-axis direction.
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