检索结果-南通市图书馆

Two new triterpenoids from Psidium guajava

在线全文

学校读者我要写书评

暂无评论

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

在线全文

学校读者我要写书评

暂无评论

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

在线全文

学校读者我要写书评

暂无评论

PPAR-γ agonists from the Aerial Parts of Scoparia dulcis

Model optimization method and connected-pipe experiment of a liquid fuel ramjet engine

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 ***,...

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

航空动力学报 2013年第6期28卷 1277-1285页

作者： MA Qian-rong GUO xin WU Hu chou Qian School of Power and Energy Northwest Polytechnical University Aero-Engine Altitude Simulated Key Laboratory China Gas Turbine EstablishmentAviation Industry Corporation of China

The optimization method of a mathematical model and connected-pipe experimental technique for a test in altitude test facility (ATF) of a liquid fuel ramjet engine was *** optimization of the simple mathematical model was divided into two ***,using the test engine's geometry configuration size data,a preliminary adjustment was ***,using experimental test data,the components' experiential coefficients were modified *** was laid on the simulation technique of flight condition and parameters measurement *** experimental technique was applied to a ramjet ATF test *** comparison results show that the optimized-model has higher precision and the nozzle gross thrust difference drops from 12% to about 4%.

关键词： ramjet engine model optimization altitude test facility(ATF) connected-pipe experiment simulation technique

Reaction mechanisms for 0.5Li_2MnO_3 ·0.5LiMn_(0.5)Ni_(0.5)O_2 precursor prepared by low-heating solid state reaction

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2012年第9期19卷 856-862页

作者： Dong Li Fang Lian xin-mei Hou Kuo-chih chou School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China Department of Physical Chemisitry University of Science and Technology Beijing Beijing 100083 China

Lithium-excess manganese layered oxides, which are commonly described in chemical formula 0.5Li2MnO3·0.5LiMn0.5Ni0.5O2, were prepared by low-heating solid state reaction. The reaction mechanisms of synthesizing precursors, the decomposition mechanism, and intermediate materials in calcination were investigated by means of Fourier transform infrared spectroscopy （FT-IR）, X-ray diffraction （XRD）, field emission scanning electron microscopy （FESEM）, thermogravimetric analysis （TGA）, and differential scanning calorimetry （DSC）. The major diffraction patterns of 0.5Li2MnO3·0.5LiMn0.5Ni0.5O2 powder calcinated at 720℃ for 15 h are indexed to the hexagonal structure with a space group of R3m, and the clear splits of doublets at （006）/（102） and （108）/（110） indicate that the sample adopts a well-layered structure. FESEM images show that the size of the agglomerated particles of the sample ranges from 100 to 300 nm.

关键词： lithium batteries electrode manganese oxide solid state reactions calcination

Tunable fabrication of single-crystalline CsPbI_(3) nanobelts and their application as photodetectors

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2021年第6期28卷 1030-1037页

作者： Tao Yang Ya-peng Zheng Kuo-Chih chou xin-mei Hou Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing 100083China

Lead halide perovskites have received increasing attention recently as a candidate material in various optoelectronic areas because of their high performance as light ***,we report the growth of CsPbI_(3) nanobelts via a solution process.A single-crystalline CsPbI_(3) nanobelt with uniform morphology can be achieved by controlling the amount of PbI_(2).A single-crystalline CsPbI_(3) nanobelt possesses a mean width,length,and thickness of 100 nm,5μm,and 20 nm,*** this work,photodetectors(PDs)based on individual CsPbI_(3) nanobelts are constructed and found to perform well with an external quantum efficiency and responsivity of 2.39×10^(5)% and 770 A/W,*** PDs also show a high detectivity of up to 3.12×10^(12) Jones,which is at par with that of Si *** PDs developed in this work exhibit great promise in various optoelectronic nanodevices.

关键词： photodetector cesium lead triiodide perovskite nanobelt detectivity

Dissolution and diffusion of TiO_2 in the CaO-Al_2O_3-SiO_2 slag

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2014年第4期21卷 345-352页

作者： Zhong-shan Ren Xiao-jun Hu xin-mei Hou Xiang-xin Xue Kuo-chih chou State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing School of Metallurgical and Ecological Engineering University of Science and Technology Beijing School of Materials and Metallurgy Northeastern University

The dissolution of TiO2 in the CaO-Al2O3-SiO2 slag under static conditions was studied in the temperature range from 1643 K to 1703 K. After TiO2 dissolved, the microstructure of the interface between TiO2 and the slag was observed by scanning electron microscopy, and the concentration profiles of Ti4＋and other ions across the TiO2/slag interfaces were analyzed by energy-dispersive X-ray spectroscopy. On the basis of these results, the dissolution behavior of TiO2 was evaluated, and the diffusivity of Ti4＋in the bulk slag was estimated. Ac-cording to the Stokes-Einstein relation, the viscosity calculated by a previously reported model gave a diffusivity of Ti4＋ions greater than that estimated by the concentration profiles of Ti4＋ions. The mechanism of TiO2 dissolution in the CaO-Al2O3-SiO2 slag is discussed in de-tail.

关键词： slags titanium dioxide dissolution diffusion interface

Thermal oxidation of SiAlON powders synthesized from coal gangue

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2011年第1期18卷 77-82页

作者： xin-mei Hou Chang-sheng Yue Mei Zhang Kuo-chih chou School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 China The Key Laboratory of Ecological ＆ Recycle Metallurgy Ministry of Education of China Beijing 100083 China

The oxidation behavior of different SiAlON phases（β-SiAlON,X-phase SiAlON and 12H powders） synthesized from coal gangue in air atmosphere was investigated using isothermal thermogravimetry（TG） and field-emission scanning electron microscopy（FE-SEM）.The effect of ferric oxide impurities in coal gangue was *** results show that ferric oxide contributes to the growth of SiAlON crystalline during the synthesis *** the oxidation experiment,the existence of ferric oxide decreases the oxidation resistance of *** reason is that the impurity causes the formation of a liquid phase at a higher *** 1423-1623 K,the oxidation of SiAlON powders is diffusion controlled and it can be described by chou＇s model.A fair agreement is found between theoretical calculations and the experimental data.

关键词： oxidation kinetics silicon compounds powders coal

Impact of intracellular innate immune receptors on immunometabolism

在线全文

学校读者我要写书评

暂无评论

Cellular & Molecular Immunology 2022年第3期19卷 337-351页

作者： Wei-Chun chou Elena Rampanelli xin Li Jenny P-Y.Ting Lineberger Comprehensive Cancer Center University of North Carolina at Chapel HillChapel HillNC27599USA Department of Genetics University of North Carolina at Chapel HillChapel HillNC27599USA Amsterdam UMC(University Medical Center location AMC)Department of Experimental Vascular MedicineAGEM(Amsterdam Gastroenterology Endocrinology Metabolism)InstituteMeibergdreef 91105 AZAmsterdamThe Netherlands Comparative Immunology Research Center College of Veterinary MedicineChina Agricultural UniversityBeijing100193China

Immunometabolism,which is the metabolic reprogramming of anaerobic glycolysis,oxidative phosphorylation,and metabolite synthesis upon immune cell activation,has gained importance as a regulator of the homeostasis,activation,proliferation,and differentiation of innate and adaptive immune cell subsets that function as key factors in *** changes in epithelial and other stromal cells in response to different stimulatory signals are also crucial in infection,inflammation,cancer,autoimmune diseases,and metabolic *** crosstalk between the PI3K-AKT-mTOR and LKB1-AMPK signaling pathways is critical for modulating both immune and nonimmune cell *** bidirectional interaction between immune cells and metabolism is a topic of intense ***-like receptors(TLRs),cytokine receptors,and T and B cell receptors have been shown to activate multiple downstream metabolic ***,how intracellular innate immune sensors/receptors intersect with metabolic pathways is less well *** goal of this review is to examine the link between immunometabolism and the functions of several intracellular innate immune sensors or receptors,such as nucleotide-binding and leucine-rich repeat-containing receptors(NLRs,or NOD-like receptors),absent in melanoma 2(AIM2)-like receptors(ALRs),and the cyclic dinucleotide receptor stimulator of interferon genes(STING).We will focus on recent advances and describe the impact of these intracellular innate immune receptors on multiple metabolic *** appropriate,this review will provide a brief contextual connection to pathogenic infections,autoimmune diseases,cancers,metabolic disorders,and/or inflammatory bowel diseases.

关键词： Immunometabolism NLRs NLRP3/AIM2 inflammasomes innate sensors/receptors STING AKT-mTOR