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Two new triterpenoids from Psidium guajava

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Chinese Chemical Letters 2012年第7期23卷 827-830页

作者： Ji Cheng Shu Jian Qun Liu gui xin chou Zheng Tao Wang The MOE Key Laboratory for Standardization of Chinese Medicines and SATCM Key Laboratory for New Resources and Quality Evaluation of Chinese Medicines Institute of Chinese Materlaz Medica of Shanghai University of Traditional Chinese MedicineShanghai 201203China Key Laboratory of Modern Preparation of Traditional Chinese Medicines Ministry of EducationNanchang 330004China

Two new triterpenoids,named as 2 α,3 β,23-trihydroxylurs-12,20（30）-dien-28-oic acid β-D-glucopyranoside（1）,and 2 α,3 β,6 β,20 β,23,30-hexahydroxyurs-12-en-28-oic acid（2）,together with four known triterpenoids were isolated from the leaves of Psidium guajava *** structures were elucidated on the basis of mass and spectral evidence.

关键词： Psidium guajava Triterpcnoid

Preparative Separation of Four Alkaloids from Gelsemium elegans by High-speed Counter-current Chromatography

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Chinese Herbal Medicines 2015年第3期7卷 267-272页

作者： Qiu-ping Zhang Zheng-tao Wang gui-xin chou Key Laboratory of Standardization of Chinese Medicines Ministry of Education Institute of Chinese Materia Medica of Shanghai University of Traditional Chinese Medicine Key Laboratory of General Administration of Sport Shanghai Research Institute of Sports Science Shanghai R&D Center for Standardization of Chinese Medicines

Objective To develop an efficient preparative method for the separation of Gelsemium alkaloids from Gelsemium elegans. Methods High-speed counter-current chromatography （HSCCC） with several two-phase solvent systems was investigated for the separation of Gelsemium alkaloids. The purity and structure identification of the purified compounds were performed with HPLC and NMR spectra, respectively. Results In a single operation, 206.6 mg of crude alkaloid sample was separated to yield 28.7 mg of koumine, 24.9 mg of gelsemine, 26.9 mg of humantenine, and 7.2 mg of gelsevirine, with the purities of 97.8%, 95.4%, 97.4%, and 93.5%, respectively. Conclusion A preparative HSCCC method is successfully established for the separation of four Gelsemium alkaloids from G. elegans with a modified two-phase solvent system com posed of n-hexane-ethyl acetate-ethanol-O. 5% triethylamine-H2O （3：5：3：4）.

关键词： high-speed counter-current chromatography Gelsemium alkaloids Gelsemiumelegans separation

PPAR-γ agonists from the Aerial Parts of Scoparia dulcis

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PPAR-γ agonists from the Aerial Parts of Scoparia dulcis

Hausdorff Dimension and Measure of a Class of Subsets of the General Sierpinski Carpets

第十四届全国中药和天然药物学术研讨会

作者： Qing Liu Qi-Ming Yang Hai-Jun Hu Li Yang Ying-Bo Yang gui-xin chou Zheng-Tao Wang Shanghai University of Traditional Chinese Medicine Shanghai R&D Center for Standardization of Chinese Medicines China Pharmaceutical University

＜正＞PPAR-γis a member of the nuclear hormone receptor superfamily that can be activated by many kinds of *** activation results in increased insulin sensitivity partly by reversing lipotoxicity-induced insulin ***,...

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来源： cnki会议评论

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Acta Mathematica Sinica,English Series 2010年第7期26卷 1369-1382页

作者： Yong xin gui Department of Mathematics Xianning College Xianning 437100 P. R. China Department of Mathematics East China Normal University Shanghai 200062 P. R. China

In this paper we study a class of subsets of the general Sierpinski carpets for which two groups of allowed digits occur in the expansions with proportional frequency. We calculate the Hausdorff and Box dimensions of these subsets and give necessary and sufficient conditions for the corresponding Hausdorff measure to be positive and finite.

关键词： the general Sierpinski carpets Hausdorff dimension Hausdorff measure

High-dose atorvastatin pretreatment could diminishes microvascular impairment in patients undergoing elective percutaneous coronary intervention

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Journal of Geriatric Cardiology 2013年第4期10卷 355-360页

作者： gui-xin He Wei Tan Department of Cardiology the First Affiliated Hospital of Guangxi University of Chinese Medicine 89-9 Dongge Road Qingxiu District Nanning 530023 Guangxi Province China

OBJECTIVES: High-dose statins pretreatment is reasonable before percutaneous coronary intervention (PCI) to reduce the risk of periprocedural myocardial injury。 However, the mechanism underlying this protective effect has not been elucidated。 The aim of this study is to evaluate the effects of high-dose atorvastatin pretreatment on microvascular function and myocardial injury after elective PCI。 METHODS: Eighty four patients underwent elective PCI were randomly assigned to high-dose atorvastatin (40 mg/d) and low-dose atorvastatin (20 mg/d) treatment for 7 days before PCI。 The index of microcirculatory resistance (IMR) was measured by an intracoronary ressure/temperature sensor-tipped guidewire at maximal hyperemia after PCI。 Fractional flow reserve (FFR) was measured before and after procedure。 Troponin I levels were obtained at baseline and 20-24 h after procedure。 RESULTS: IMR values were significantly lower in high-dose group when compared to low-dose group (16.5 ±6.1 vs。31.2 ±16.0, P 20 atm as an independent predictor of IMR >32 (Odds ratio (OR):3.3,95% confidence intervals (95%CI):1.3-8.5, P =0.02)。 High-dose atorvastatin was the only independent protective factor of IMR >32 (OR:0.29,95%CI:0.11-0.74, P =0.01)。 CONCLUSIONS: The present study confirmed that diminishing microvascular impairment is one of the mechanism underlying protecting effect of high-dose statins pretreatment from myocardial injury during PCI。 These suggest that high-dose statin pretreatment is reasonable in patients undergoing elective PCI。

关键词： Index of microcirculatory resistance Microvascular function Myocardial injury Percutaneous coronary intervention Statins

On Edge Colorings of 1-Toroidal Graphs

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Acta Mathematica Sinica,English Series 2013年第7期29卷 1421-1428页

作者： xin ZHANG gui Zhen LIU Department of Mathematics Xidian University School of Mathematics Shandong University

A graph is 1-toroidal, if it can be embedded in the torus so that each edge is crossed by at most one other edge. In this paper, it is proved that every 1-toroidal graph with maximum degree △ ≥ 10 is of class one in terms of edge coloring. Meanwhile, we show that there exist class two 1-toroidal graphs with maximum degree △ for each A ≤ 8.

关键词： 1-Toroidal graph 1-planar graph edge coloring

Group Edge Choosability of Planar Graphs without Adjacent Short Cycles

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Acta Mathematica Sinica,English Series 2013年第11期29卷 2079-2086页

作者： xin ZHANG gui Zhen LIU Department of Mathematics Xidian University School of Mathematics Shandong University

In this paper, we prove that 2-degenerate graphs and some planar graphs without adjacent short cycles are group （△ （G）＋1）-edge-choosable, and some planar graphs with large girth and maximum degree are group △（... 详细信息

关键词： Group edge coloring list coloring planar graphs short cycles girth

Thermodynamics of Cascaded Waste Heat Utilization from Flue Gas and Circulating Cooling Water

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Journal of Thermal Science 2023年第6期32卷 2166-2178页

作者： LI Yuanyuan CHEN xin JIANG Shan LU gui State Key Laboratory of New Energy Power Systems North China Electric Power UniversityBeijing102206China Department of Water Resources China Institute of Water Resources and Hydropower ResearchBeijing100038China School of Energy Power and Mechanical Engineering North China Electric Power UniversityBeijing102206China

A detailed thermal power plant model was developed to evaluate power plant waste heat usage in terms of the operating parameters,energy consumption,water consumption,and pollutant *** model was used to analyze the bypass flue gas energy cascade utilization design which provides excellent energy savings and emission *** paper then presents a design to use the low-temperature waste heat and to extract water from the flue *** low-grade heat can be recovered from a coal-fired unit using absorption heat pumps to increase the air *** method significantly reduces the turbine steam extraction in the low pressure stages which increases the turbine power and reduces the coal *** design has a small heat transfer temperature difference between the air preheater and the air warmer,resulting in a smaller exergy *** power output of the present design was 1024.28 MW with a coal consumption savings of 3.69 g·(kWh)^(−1).In addition,the present design extracts moisture out of the flue gas to produce 46.48 t·h^(−1)of *** main goal of this work is to provide a theoretical analysis for studying complex thermal power plant systems and various energy conservation and CO_(2)reduction options for conventional power plants.

关键词： integrated thermal power plant model low-grade waste heat energy cascade utilization exergy losses absorption heat pumps

The Hausdorff Dimension of Sets Related to the General Sierpinski Carpets

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Acta Mathematica Sinica,English Series 2010年第4期26卷 731-742页

作者： Yong xin gui Wen Xia LI Department of Mathematics East China Normal University Shanghai 200241 P. R. China Department of Mathematics Xianning College Xianning 437005 P. R. China

In this paper we study a class of subsets of the general Sierpinski carpets for which the allowed two digits in the expansions occur with proportional frequency. We calculate the Hausdorff and box dimensions of these ... 详细信息

关键词： general Sierpinski carpets Hausdorff dimension Hausdorff measure