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Chemical Research in Chinese Universities 2011年第2期27卷 254-257页

作者： CAO jian li li-sen liu Biao liu Hao-yu ZHANG Hui ZHAO Ming-ming YIN Wei-tian China-Japan Union Hospital of Jilin University Changchun 130033 P. R. China

The purpose of this study is to explore the expression of growth-associated protein（GAP-43） in spinal cord segments connected with injured sciatic nerve by the treatment with brazilein in mice. Unilateral sciatic nerve interruption and anastomosis were performed. Physiological saline（blank group）, high dose, middle dose and low dose of brazilein were administrated intragastrically to healthy adult BALB/c mice in separate groups. L4―6 spinal segments connected with the sciatic nerve were harvested. Real-time PCR（Polymerase chain reaction） and Western blot analysis were performed to detect the expression of GAP-43 in spinal segments. Histological staining on myelin and the electrophysiology were performed to examine the sciatic nerve recovery. GAP-43 was activated in spinal cord L4―6 connected with injured sciatic nerve. In the survival time of 12 h, 24 h, 3 d, 5 d, 7 d and 14 d, GAP-43 expression in the motor neurons of spinal cord of the high dose group and that in the middle dose group were significantly higher than those on the low dose and blank groups. Myelin in the high dose group and that in the middle dose group were more mature and the potential amplitude and MNCV（motor nerve conduction velocity） in the high and middle dose groups were obviously higher than those in the low dose group and blank group. Brazilein facilitates the expression of GAP-43 in neurons in spinal cord L4―6 segments connected with injured sciatic nerve, which promotes nerve regeneration.

关键词： Brazilein Growth-associated protein(GAP-43) Injury of sciatic nerve Regeneration

Assessment of the hepatic microvascular changes in liver cirrhosis by perfusion computed tomography

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World Journal of Gastroenterology 2009年第28期15卷 3532-3537页

作者： Mai-lin Chen Qing-Yu Zeng jian-Wei Huo Xiao-Ming Yin Bao-Ping li jian-Xin liu Department of Radiology ChinaMeitan General Hospital No. 29 Xibahe Nanli ChaoyangDistrict Beijing 100028 China

AIM： TO assess the hepatic microvascular parameters in patients with liver cirrhosis by perfusion computed tomography （CT）. METHODS： Perfusion CT was performed in 29 patients without liver disease （control subjects） and 39 patients with liver cirrhosis, including 22 patients with compensated cirrhosis and 17 patients with decompensated cirrhosis, proved by clinical and laboratory parameters. CT cine-scans were obtained over 50 s beginning with the injection of 50 mL of contrast agent. Hepatic microvascular parameters, mean transit time （MTT） and permeability surface area product （PS） were obtained with the Perfusion 3 software （General Electric, ADW 4.2）. RESULTS： The overall differences of MTT and PS between control subjects, patients with compensated cirrhosis and those with decompensated cirrhosis were statistically significant （P = 0.010 and P = 0.002, respectively）. MTT values were 15.613 ± 4.1746 s, 12.592 ± 4.7518 s, and 11.721 ± 4.5681 s for the three groups, respectively, while PS were 18.945 ± 7.2347 mL/min per 100 mL, 22.767 ± 8.3936 mL/min per 100 mL, and 28.735 ± 13.0654 mL/min per 100 mL. MTT in decompensated cirrhotic patients were significantly decreased compared to controls （P = 0.017）, whereas PS values were remarkably increased （P = 0.001）.CONCLUSION： The hepatic microvascular changes in patients with liver cirrhosis can be quantitatively assessed by perfusion CT. Hepatic microvascular parameters （MTr and PS）, as measured by perfusion CT, were significantly altered in decompensated cirrhosis.

关键词： Tomography X-ray computed Hepaticmicrocirculation Cirrhosis

Current Reversals of an Underdamped Brownian Particle in an Asymmetric Deformable Potential

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Communications in Theoretical Physics 2018年第3期69卷 266-270页

作者： Chun-Chun Cai jian-li liu Hao Chen Feng-Guo li Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials School of Physics and Telecom- munication Engineering South China Normal University Guangzhou 510006 China

Transport of an underdamped Brownian particle in a one-dimensional asymmetric deformable potential is investigated in the presence of both an ac force and a static force,*** numerical simulations,we obtain the current average *** current reversals and the absolute negative mobility are *** increasing of the deformation of the potential can cause the absolute negative mobility to be suppressed and even *** the static force is small,the increase of the potential deformation suppresses the absolute negative *** the force is large,the absolute negative mobility *** particular,when the potential deformation is equal to0.015,the two current reversals present with the increasing of the ***,when the potential deformation is small,there are three current reversals with the increasing of the friction coefficient and the average velocity presents a oscillation behavior.

关键词： particle transport asymmetric deformable potential absolute negative mobility current reversals

Effects of Carrier Gas on Carbon Incorporation in GaN

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Chinese Physics Letters 2014年第3期31卷 122-124页

作者： ZHANG jian-li liu Jun-lin PU Yong FANG Wen-Qing ZHANG Meng jianG Feng-Yi National Engineering and Technology Research Center for LED on Si Substrate Nanchang University Nanchang 330047

GaN epitaxial layers were grown on Si （111） substrates by metal organic chemical vapor deposition. Carbon concentrations in the films grown in different ambients were measured by secondary ion mass spectrometry. The results show that the carbon incorporation is strongly dependent on the H2 flow rate when the NH3 flow rate is small, but insensitive to the H2 flow rate when the NH3 flow rate is sufficient large. We conclude that H2 can inhibit the dissociation of NH3 and result in a less active N source; an insufficiently active N source causes more N vacancies, which enhances carbon incorporation.

关键词： GALliuM nitride RESEARCH CARRIER gas CHEMICAL vapor deposition CARBON PHYSICS research

High Energy Proton-Proton Elastic Scattering in the Pomeron Exchange Model

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Communications in Theoretical Physics 2002年第7期38卷 65-67页

作者： HU Zhao-Hui ZHANG jian ZHOU li-Juan liu Ji-Feng MA Wei-Xing Department of Information and Computing Science Guangxi University of Technology Liuzhou 545006 China Department of Physics Guangxi Normal University Guilin 541004 China Department of Information and Computing Science Guangxi University of Technology Liuzhou 545006 China Department of Physics Guangxi Normal University Guilin 541004 China Department of Information and Computing Science Guangxi University of Technology Liuzhou 545006 China Institute of High Energy Physics the Chinese Academy of Sciences Beijing 100039 China Institute of Theoretical Physics the Chinese Academy of Scie

We study high energy proton-proton elastic scattering in the framework of Pomeron exchange model. The cross section of the process are calculated without any free parameters. Our finding is that Pomeron exchange theory gives perfect fits to total cross section at the energy of√s higher than 10 GeV and to differential cross section at the momentum transfer [t] less than 1.5 GeV2. For total cross section at lower energy √s ＜ 10 GeV and differential cross section at larger momentum transfer region of |t| ＞ 1.5 GeV2, the Pomeron exchange theory needs to be improved.

关键词： proton-proton elastic scattering, Pomeron exchange, cross section

Kinetic Resolution of DL-Phenylalanine Methyl Ester by α -Chymotrypsin ImmobiIized on Porous Silica Beads

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Chinese Chemical Letters 1997年第5期8卷 413-416页

作者： li jian liu Ping YANG Ren Xi ZHUO(Department of Chemistry, Wuhan University, Wuhan 430072) Department of Chemistry Wuhan University Wuhan 430072 China

Kinetic resolution of DL-phenylalanine methyl ester was carried out using drimobilized α -chymotrypsin (IC) as catalyst. The effects of temperatUre, pH, concentration of substrate and reactionvessels on the resolutio... 详细信息

关键词： DL Chymotrypsin Immobilized on Porous Silica Beads Kinetic Resolution of DL-Phenylalanine Methyl Ester by

Construction of a Muscle cDNA library of Chinese Shrimp Fenneropenaeus chinensis and Sequence Analysis of the Troponin I Gene

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Journal of Ocean University of China 2010年第1期9卷 81-86页

作者： li Jitao CHEN Ping li jian liu Ping HE Yuying WANG Qingyin Yellow Sea Fisheries Research Institute Chinese Academy of Fishery Sciences Qingdao 266071 P. R. China

A muscle cDNA library of Chinese shrimp (Fenneropenaeus chinensis) was constructed with the SMARTTM cDNA library Construction *** titer of optimal primary library was 7.7×105 pfu mL-1 and that of the amplified library was 3.0×109 pfu *** percentages of the recombinant clones of primary and amplified libraries were over 98%.The insert sizes were longer than 400 bp with an average of 1000 bp.A positive clone containing a 794 bp insert was sequenced and identified encoding fast skeletal troponin I *** library provided a useful resource for the functional genomic research of ***.

关键词： Fenneropenaeus chinensis cDNA library troponin I

Comparison of the autofluorescence bronchoscope and the white light bronchoscope in airway examination

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Chinese Journal of Cancer 2010年第12期29卷 1018-1022页

作者： Yun li Xiao li Xi-Zhao Sui liang Bu Zu-li Zhou Fan Yang Yan-Guo liu Hui Zhao jian-Feng li Jun liu Guan-Chao jiang Jun Wang Department of Thoracic Surgery People's Hospital Peking University Beijing 100044 P. R. China

Background and Objective: The sensitivity and accuracy of white light bronchoscopy (WLB) in airway examination are low. Autofluorescence bronchoscope (AFB) can determine early lesions in bronchial mucosa more sensitively, but it has seldom performed in China. To assess the clinical value of the AFB in airway examination, we compared the sensitivity and specificity of the AFB and WLB in detecting cancer of the airway mucosa. Methods: Between September 2009 and May 2010, bronchoscope examinations using both the AFB and WLB were performed on 136 patients, 95 men and 41 women with a median age of 61.5 years (ranged from 25 to 84 years). There were 46 lesions located in the central airway, 84 in the peripheral lung parenchyma, and 6 in the mediastinal region. All patients received local and general anesthesia and were subsequently examined with the WLB and AFB in tandem. All procedures were completed safely. Abnormal visual findings were recorded, and biopsies of the affected regions were collected for pathologic examination. Results: Of 241 regions sampled for biopsy, 76 sites contained malignant lesions, whereas 165 sites contained benign lesions. The AFB detected 72 of the 76 malignant lesions, but the WLB detected only 50. The sensitivities of the AFB and WLB were 94.7% and 65.8%, respectively, and the specificities were 57.0% and 83.6%, respectively. The negative predictive values of the AFB and WLB were 95.9% and 84.1%, respectively. Conclusions: The AFB is more sensitive than the WLB in detecting cancerous lesions in the mucosa, and is an effective airway examination.

关键词：病理检查支气管气道萤光自体检测灵敏度空军基地色光

Low Temperature Catalytic Combustion of Ethanol over Pt/γ-Al_2O_3/Ce_xZr_(1-x)O_2 Honeycomb Catalysts

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Chemical Research in Chinese Universities 2009年第1期25卷 81-85页

作者： WANG jian-li liu Zhi-min CAO Hong-yan GONG Mao-chu CHEN Yong-dong CHEN Yao-qiang College of Chemistry Siehuan University Chengdu 610064 P. R. China

It has been found that the catalytic activity toward the decomposition of ethanol in a fix bed reactor can be greatly improved by loading Pt on the surface of CexZr1-xO2. In this study, we have investigated the effects of different x of Pt/γ-Al2O3/CexZr1-xO2 on the catalytic activity of catalysts. The prepared catalysts were characterized by BET, XRD, and TPR. The BET surface areas of the catalysts decreased with x decreasing. XRD results reveal that deposited Pt dispersed on the CexZr1-xO2 and γ-Al2O3 matrix. The order of catalytic activities is Pt/γ-Al2O3/ Ce0.5Zr0.5O2〉Pt/γ-Al2O3/Ce0.25Zr0.75O2〉Pt/γ-Al2O3/Ce0.75Zr0.26O2〉Pt/γ-Al2O3/CeO2〉Pt/γ-Al2O3/ZrO2. Among the catalysts, the reduction peak area of Pt/γ-Al2O3/Ce0.5Zr0.5O2 is the largest and the oxygen mobility is noticeably promoted, which is in good harmony with the catalytic activity. Incorporation of ZrO2 into the CeO2 lattice considerably decreases the destruction temperature for ethanol. Based on these observations, the mechanistic role of oxygen mobility in the oxidation reaction has been suggested.

关键词： Ethanol Catalytic combustion Oxygen storage material Monolithic catalyst

Preliminary Study on Spatial Variability and Distribution of Soil Available Microelements in Pinggu County, Beijing, China

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Agricultural Sciences in China 2008年第10期7卷 1235-1244页

作者： WANG Shu-ying YU Tong-quan WANG jian-li YANG liu YANG Kai LU Ping New Technological Laboratory in Agriculture Application in Beijing Beijing University of Agriculture Beijing 102206 RR.China

The objectives of this study were to explore the spatial distribution of soil available microelements and to provide a firm foundation for scientifically formulated fertilizer. 1 076 soil samples were collected from Pinggu County of Beijing, China, and the contents of available Cu, Zn, Fe, and Mn in topsoil （0-20 cm） and subsoil （20-40 cm） were analyzed respectively. Descriptive statistics and geostatistics were used to analyze the data. The mean values of topsoil available Cu, Zn, Fe, and Mn were 1.96, 2.51, 17.32, and 10.91 mg kg^-1, respectively, which were at medium or at slightly above medium level. The topsoil content of the soil available microelements was more than that of subsoil. The result of semivariance analysis showed that the topsoil available Fe and Mn were spatially correlated at a larger distance of 21.6 and 45.3 km, and the available Cu and Zn were at a shorter distance of 3.1 and 2.9 km, respectively. The subsoil spatial correlation distances were obviously different from the topsoil, which were in the order of available Mn 〉 Cu 〉 Zn = Fe. The Kriging method was applied to calculate the unobserved points and was used to generate the contour map. The results showed that the structural factors, such as topology, soil types, and soil properties, were the main factors influencing the spatial distribution of topsoil available Fe and Mn. Topsoil available Cu and Zn contents were mainly affected by land use, and their contents in orchard and in vegetable land were greatly higher than in field. The spatial distribution of subsoil microelements was similar to that of the topsoil, which exhibited vertical distribution patterns. Fertilizer and pesticide application resulted in the higher contents of available Cu and Zn in Pinggu County. The higher content of available Zn is potentially harmful to soil environmental quality, which should be inspected.

关键词： soil available microelements semivariance spatial variability