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Adenine-mediated amide-containing metal-organic framework toward one-step ethylene purification from a ternary mixture

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Chinese Journal of Structural Chemistry 2023年第2期42卷 1-4页

作者： Fang-Jing Guo Ning Yang Hong-Xin Li Han Fang Dong-xu xue Key Laboratory of Applied Surface and Colloid Chemistry Ministry of EducationXi'an Key Laboratory of Organometallic Material ChemistrySchool of Chemistry&Chemical EngineeringShaanxi Normal UniversityXi'an710062China

*** Ethylene is one of the most important raw materials in petrochemical *** to its specified synthesis process via steam cracking and thermal decomposition of either naphtha or ethane,acetylene and ethane are inevita... 详细信息

关键词： ethane ternary specified

PSD95 Gene Specific siRNAs Attenuate Neuropathic Pain through Modulating Neuron Sensibility and Postsynaptic CaMKIIα Phosphorylation

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Chinese Medical Sciences Journal 2011年第4期26卷 201-207页

作者： Le Shen xu Li Wen Chen Li xu Wei Liu xue-rong Yu Yu-guang Huang Department of Anesthesiology Peking Union Medical College Hospital Chinese Academy of Medical Sciences ＆ Peking Union Medical College Beijing 100730 China

Objective To observe the effects of PSD95 gene specific siRNAs on neuropathic pain relief, neuron viability, and postsynaptic calcium/calmodulin-dependent protein kinase IIα (CaMKIIα) phosphorylation in vitro and in vivo. Methods Gene-specific siRNAs of rat PSD95 were synthesized chemically for transfection. Adult male Sprague-Dawley (SD) rats were randomly divided into 3 groups: nave group (n=6), sham group (n=6), and sciatic nerve chronic constriction injury (CCI) group (n=24). The CCI group was further divided into 4 groups (n=6 in each group), which were pretreated with normal saline, transfection vehicle, negative control siRNAs, and PSD95 gene specific siRNAs respectively. All the subgroups received corresponding agents intrathecally for 3 days, started one day before the CCI of sciatic nerve. Both mechanical allodynia and thermal hyperalgesia were measured on post-operative day 3 and 7. PSD95 gene silenced NG108-15 cells were further stimulated by glutamate, with the cell viability and the expression/phosphorylation of CaMKIIα measured by MTT cell proliferation assay and Western blot, respectively. Results The siRNAs decreased PSD95 mRNA level significantly both in vivo and in vitro. Neuropathic pain rats pretreated with PSD95 gene specific siRNAs exhibited significant elevation in the mechanical withdrawal threshold and paw withdrawal thermal latency, without affecting the baseline nociception. PSD95 gene silencing enhanced neuronal tolerance against the glutamate excitotoxicity, meanwhile the phosphorylation of CaMKIIα Thr286 was attenuated. Conclusion Pre-emptive administration of PSD95 gene specific siRNAs may attenuate the central sensitization CaMKIIα-related signaling cascades, leading to the relief of neuropathic pain.

关键词： PSD95 siRNAs neuropathic pain glutamate excitotoxicity calcium/calmodulin- dependent protein kinase IItt

Fractal Analysis of Transport Properties in a Sinai Billiard

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Chinese Physics Letters 2011年第12期28卷 67-69页

作者： JIANG Guo-Hui ZHANG Yan-Hui BIAN Hong-Tao xu xue-You College of Physics and Electronics Shandong Normal UniversityJi'nan 250014 Information Research Institute Shandong Academy of SciencesJi'nan 250014

Research contacting chaos with fractals is carried ***,we employ the theoretical quarter Sinai billiard model to study its chaos by using the stationary expansion *** the billiard is chaotic,the singular point shows *** further utilize the method of simplified box counting to calculate the fractal *** result evidently proves the self-similarity of the singular point before escaping from a potential well.

关键词： method chaos singular

The effect of selected alloying element additions on properties of Mg-based alloy as bioimplants： A literature review

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Frontiers of Materials Science 2013年第3期7卷 227-236页

作者： Li-Nan ZHANG Zeng-Tao HOU Xin YE Zhao-Bin xu xue-Ling BAI Peng SHANG Center for Translational Medicine Research and Development Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen 518055 China

This review investigates the current application limitations of Mg and Mg alloys. The key issues hindering the application of biodegradable Mg alloys as implants are their fast degradation rate and biological consideration. We have discussed the effect of some selected alloying element additions on the properties of the Mg-based alloy, especially the nutrient elements in human （Zn, Mn, Ca, St）. Different grain sizes, phase constituents and distributions consequently influence the mechanical properties of the Mg alloys. Solution strengthening and precipitation strengthening are enhanced by the addition of alloying elements, generally improving the mechanical properties. Besides, the hot working process can also improve the mechanical properties. Combination of different processing steps is suggested to be adopted in the fabrication of Mg-based alloys. Corrosion properties of these *** alloys have been measured in vitro and in vivo. The degradation mechanism is also discussed in terms of corrosion types, rates, by- products and response of the surrounding tissues. Moreover, the clinical response and requirements of degradable implants are presented, especially for the nutrient elements （Ca, Mn, Zn, Sr）. This review provides information related to different Mg alloying elements and presents the promising candidates for an ideal implant.

关键词： magnesium alloy alloying element corrosion biodegradation

Synthesis, Crystal Structure and Thermal Property of Dimethyl Phenanthrene-9,10-dicarboxylate

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Chinese Journal of Structural Chemistry 2020年第5期39卷 908-912页

作者： LUO Zai-Gang LIU Qian-Nan LI Rui xu xue-Mei College of Chemical Engineering Anhui University of Science and TechnologyHuainan 232001China

The target compound(C18H14O4)was synthesized and structurally determined by single-crystal X-ray *** crystal is of monoclinic system,space group P21/n with a=7.9383(6),b=19.5083(13),c=9.4189(7)?,β=98.981(2)°,C18H14O4,Mr=294.29,Dc=1.357 g/cm^3,V=1440.75(18)?3,Z=4,F(000)=616,μ(MoKa)=0.096 mm-1,T=293(2)K,3320 independent reflections with 1845 observed ones(I>2σ(I)),R=0.0529 and wR=0.1082 with GOF=1.015(R=0.1202 and wR=0.1278 for all data).The phenanthrene skeleton is *** overall crystal packing revealed that it has reverse staggered parallel and stratified *** a one-dimensional interaction model was formed by two kinds ofπ-πinteractions between the two adjacent molecules at upper and lower *** decomposition mechanism of compound 3 is complex.

关键词： phenanthrene synthesis crystal structure thermal property

Grass-livestock balance based grassland ecological carrying capability and sustainable strategy in the Yellow River Source National Park, Tibet Plateau, China

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Journal of Mountain Science 2021年第8期18卷 2201-2211页

作者： YU Hui LIU Bin-tao WANG Gen-xu ZHANG Tong-zuo YANG Yan LU Ya-qiong xu You-xue HUANG Min YANG Yi ZHANG Lv Institute of Mountain Hazards and Environment Chinese Academy of SciencesChengdu610041China Northwest Institute of Plateau Biology Chinese Academy of SciencesKey Laboratory of Adaptation and Evolution of Plateau BiotaXining810001China Qinghai Grassland General Station Xining810001China University of Chinese Academy of Sciences Beijing100049China Sichuan Institute of Land Science and Technology(Sichuan Satellite Application Technology Center) Chengdu610045China

The Yellow River Source National Park(YRSP)is one of the most sensitive and fragile ecological regions in the *** historical intensive grazing and climate change have resulted in ecological degradation that threatens the wildlife and *** the sustainable strategy is urgent for policy makers to meet the demands for wild ungulates and *** our study,the grassland ecological carrying capability(GECC)was assessed based on the updated grass-livestock balance that considered the grass competition from wild *** balances between grass and livestock,and GECC and grassland pressure index(GPI)in the YRSP were measured through overlay analysis and geostatistic *** results showed that:(1)the ratio of livestock to wild ungulates in the research area was approximately 4.56:1,in which the proportion of livestock was 81.75%and the actual number of livestock was 33.84×104 standard sheep units;(2)Under the scenario of minimum grazing utilisation rate,the theoretical grazing capacity and GECC were 37.83×104 standard sheep units and−0.13,*** the maximum grazing utilisation rate,the theoretical grazing capacity and GECC were 41.93×104 standard sheep units and−0.21,*** GECC in both scenarios were both less than 0,the grassland was considered to be in surplus and the livestock was not ***,GPI in the two scenarios were 0.87 and 0.79,respectively,both of which exceeded the warning line of *** on GECC,we recommend that the sustainable strategy in YRSP is either to increase the supplementary feeding about 6.40×104 standard sheep units or reduce the grazing livestock by about 3.50×10^(4) standard sheep units.

关键词： Yellow River Source National Park Grassland ecological carrying capability Grasslivestock balance

Application of SWAT99.2 to sensitivity analysis of water balance components in unique plots in a hilly region

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Water Science and Engineering 2017年第3期10卷 209-216页

作者： Jun-feng Dai Jia-zhou Chen Guo-an Lu Larry C. Brown Lei Gan Qin-xue xu College of Environmental Science and Engineering Guilin University of TechnologyGuilin 541004China College of Resources and Environment Huazhong Agricultural UniversityWuhan 430070China Key Laboratory of Karst Dynamics by MLR&Guangxi of PRC IRCK by UNESCOGuilin 541004China Department of Food Agricultural and Biological EngineeringOhio State UniversityColumbus 43210USA

Although many sensitivity analyses using the soil and water assessment tool(SWAT) in a complex watershed have been conducted, little attention has been paid to the application potential of the model in unique plots. In addition, sensitivity analysis of percolation and evapotranspiration with SWAT has seldom been undertaken. In this study, SWAT99.2 was calibrated to simulate water balance components for unique plots in Southern China from 2000 to 2001, which included surface runoff, percolation, and evapotranspiration. Twenty-one parameters classified into four categories, including meteorological conditions, topographical characteristics, soil properties, and vegetation attributes, were used for sensitivity analysis through one-at-a-time(OAT) sampling to identify the factor that contributed most to the variance in water balance components. The results were shown to be different for different plots, with parameter sensitivity indices and ranks varying for different water balance components. Water balance components in the broad-leaved forest and natural grass plots were most sensitive to meteorological conditions, less sensitive to vegetation attributes and soil properties, and least sensitive to topographical characteristics. Compared to those in the natural grass plot, water balance components in the broad-leaved forest plot demonstrated higher sensitivity to the maximum stomatal conductance(GSI) and maximum leaf area index(BLAI).

关键词： Forest and grass plots Water balance Sensitivity analysis Soil and water assessment tool (SWAT) One-at-a-time (OAT) method

Mechanism of titanium-nitride chemical mechanical polishing

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Chinese Physics B 2021年第2期30卷 549-556页

作者： Dao-Huan Feng Ruo-Bing Wang Ao-xue xu Fan xu Wei-Lei Wang Wei-Li Liu Zhi-Tang Song State Key Laboratory of Functional Materials for Informatics Laboratory of NanotechnologyShanghai Institute of Micro-system and Information TechnologyChinese Academy of SciencesShanghai 200050China University of the Chinese Academy of Sciences Beijing 100049China

During the preparation of the phase change memory,the deposition and chemical mechanical polishing(CMP)of titanium nitride(TiN)are indispensable.A new acidic slurry added with sodium hypochlorite(NaClO)as an oxidizer is developed for the CMP of TiN *** has achieved a material removal rate of 76 nm/min,a high selectivity between TiN film and silica(SiO_(2))films of 128:1,a selectivity between TiN film and tungsten film of 84:1 and a high surface *** understand the mechanism of TiN CMP process,x-ray photoelectron(XPS)spectroscope and potentiodynamic polarization measurement are *** is found that the mechanism of TiN CMP process is cyclic reaction polishing *** addition,both static corrosion rate and the inductively coupled plasma results indicate TiN would not be dissolved,which means that the mechanical removal process of oxide layer plays a decisive role in the material removal ***,the mechanism of TiN polishing process is given based on the analysis of surface potential and the description of blocking function.

关键词： TiN chemical mechanical polishing mechanism

Application of Inflammatory Markers in Induced Sputum in Stable Chronic Obstructive Pulmonary Disease Patients with Positive Bronchodilation Tests

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Current Medical Science 2019年第4期39卷 560-567页

作者： xu-xue GUO Ni-shan DENG Qian-hui CHEN Hong-ying YU xu-hong DING Su-ping HU Han-xiang NIE Department of Respiratory Diseases Renmin Hospital of Wuhan UniversityWuhan 430060China

Positive bronchodilation (BD) tests can be noticed in some stable chronic obstructive pulmonary disease (COPD) *** characteristics of airway inflammation in this entity remain *** study aimed to identify the characteristics of airway inflammation in stable COPD patients with positive BD *** airway inflammation was assessed in 88 patients with stable COPD using the examination of induced sputum in the aftermath of lung function and BD *** counts and the levels of molecular markers including eosinophil cationic protein (ECP),myeloperoxidase (MPO),interleukin-5 (IL-5),and IL-8 were assayed by Wright's stain,Immuno-CAP system,and ELISA,*** the 88 patients with stable COPD,20 (22.7%) showed positive BD *** values of eosinophils (4.7%±3.4%) and ECP (90.1±41.6 ng/mL) in induced sputum in stable COPD patients with positive BD tests were markedly elevated as compared with those in stable COPD patients with negative BD tests or in healthy controls (all P0.05).Moreover,the values of neutrophils (61.8%±15.1%),MPO (574.0±111.8 ng/mL),and IL-8 (32.6±13.4 ng/mL) in induced sputum in stable COPD patients with positive BD tests were significantly higher than those in asthmatics or normal controls (all P0.05).The stable COPD patients with positive BD tests may present not only eosinophilic airway inflammation but also neutrophilic airway inflammation.

关键词： airway inflammation bronchodilation tests chronic obstructive pulmonary disease induced sputum