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Cropland physical disturbance intensity： plot-scale measurement and its application for soil erosion reduction in mountainous areas

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Journal of Mountain Science 2018年第1期15卷 198-210页

作者： LI Ming WANG Yu-kuan xu pei FU Bin TIAN Cong-shan WANG Shan Institute of Mountain Hazards and Environment The Chinese Academy of Sciences Chengdu 610041 China University of Chinese Academy of Sciences Beijing 100049 China Chengdu Land Planning and Cadastre Center Chengdu 610074 China

Various kinds of human disturbances on cropland are the main reasons for soil erosion and land *** practices in mountainous areas vary greatly among cropland plots because of the heterogeneity of biophysical conditions and differences in farmers'management *** main purpose of this paper is to develop a composite index of cropland physical disturbance intensity(CLDI)to reflect the plot-scale discrepancy of potential soil erosion in mountainous *** study was based on both plot survey and household interview data,collected from six typical catchments in mountainous areas of southwestern *** kinds of physical disturbance practices and two kinds of conservation practices during one crop rotation period were synthesized to develop the CLDI *** rough set theory was referenced to avoid subjectivity during weight *** results show that conventional tillage,deep fertilization,and manual weeding are the main causes of cropland soil erosion,whereas manure application in combination with seasonal fallow reduces soil *** crop types as well as cropland location factors determine the spatial pattern of *** rotation modes with major crops of tobacco and maize resulted in a maximal CLDI,and cropland plots with a distance radius of 150 meters away from households received the most intensive physical *** results are critical to help better protect rural environments in mountainous *** on the results,methods to reduce cropland soil erosion are suggested.

关键词： Cropland disturbance intensity Soil erosion Farming practices Farmers' behavior Rough set theory Index development

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Vehicle Detection and Tracking Based on Fast Wavelet Transform and Kalman Filter

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微计算机信息 2008年第33期 278-280+268页

作者： LIN pei-qun xu Jian-min

A new approach for vehicle detection is proposed in this ***,fast wavelet transform(FWT)designed for discrete signal is proposed to extract image texture,while grey level co-occurrence matrix(GLCM)is employed to measure and analyze the extracted ***,vehicles can be extracted since the vehicle sections and the shadow sections have different textures in the combined foreground ***,we put forward in this work the state and observation matrixes of Kalman filter which has been employed to track vehicles under complicated traffic *** results in real traffic scenes reveal that the proposed techniques are effective and efficient for vehicle detection and tracking.

关键词： Intelligent transportation systems Vehicle detection Vehicle tracking Fast wavelet transform Kalman filter

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Mn(Ⅲ)-mediated radical cascade reaction of boronic acids with isocyanides:Synthesis of diimide derivatives

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Chinese Chemical Letters 2019年第2期30卷 379-382页

作者： Fei Wang Tian-Qi Wei pei xu Shun-Yi Wang Shun-Jun Ji Key Laboratory of Organic Synthesis of Jiangsu Province College of ChemistryChemical Engineering and Materials Science ξ Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow University

A manganese (Ⅲ)-promoted oxidative radical cascade reaction of easily accessible arylboronic acids with isocyanides to construct diimide derivatives was studied. This protocol provides a new way to synthesis of acety... 详细信息

关键词： Mn(OAc)3 Isocyanide Arylboronic acid Diimide derivatives Radical cascade

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Synergistic chemo-/photothermal therapy based on supercritical technology-assisted chitosan–indocyanine green/luteolin nanocomposites for wound healing

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Regenerative Biomaterials 2022年第1期9卷 844-857页

作者： pei-Yao xu Ranjith Kumar Kankala Yue-Wei Li Shi-Bin Wang Ai-Zheng Chen Institute of Biomaterials and Tissue Engineering Huaqiao UniversityXiamenFujian 361021PR China Fujian Provincial Key Laboratory of Biochemical Technology(Huaqiao University) XiamenFujian 361021PR China

Despite the success,it is highly challenging to battle against pathogenic biofilms-based chronic bacterial infections by conventional antibiotic ***,we report a near-infrared(NIR)/acid-induced nanoplatform based on chitosan(CS)-coated indocyanine green(ICG,photosensitizer)/luteolin(LUT,a natural quorum sensing inhibitor)nanocomposites(ICG/LUT-CS)as antibacterial and antibiofilm agents for skin wound ***,the ICG/LUT nanoplatforms are prepared by the supercritical antisolvent technology and coated with the CS *** obtained ICG/LUT-CS with ultra-high encapsulation efficiency exhibited more favorable photothermal conversion effects and improved NIR laser/acid dual-induced drug release behavior than individual modalities,achieving exceptional bacteria-killing and biofilm elimination ***,the ICG/LUT-CS realized the synergetic effects of chemotherapy and photothermal therapy outcomes for wound ***,our findings provided an appealing strategy for the rapid preparation and future translational application of ICG/LUT-CS as an ideal agent for fighting against biofilm infections.

关键词： photothermal therapy supercritical carbon dioxide antibacterial antibiofilm wound healing

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Effects of Exogenous Silicon on the Activities of Antioxidant Enzymes and Lipid Peroxidation in Chilling-Stressed Cucumber Leaves

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Agricultural Sciences in China 2009年第9期8卷 1075-1086页

作者： LIU Jiao-jing LIN Shao-hang xu pei-lei WANG Xiu-juan BAI Ji-gang State Key Laboratory of Crop Biology/College of Life Sciences Shandong Agricultural UniversityTai’an 271018P.R.China

In order to increase vegetable productivity by improving environmental conditions, this article investigates the effects of exogenous silicon on the activities of major antioxidant enzymes and on lipid peroxidation under chilling stress, and it examines whether silicon-induced chilling tolerance is mediated by an increase in antioxidant activity. Cucumis sativus cv. Jinchun 4 was hydroponically cultivated to the two-leaf stage, at which point seedlings were watered with different concentrations of silicon (0, 0.1 and 1 mmol L^-1) and separately exposed to normal (25/18℃) or chilling (15/8℃) temperatures for six days under low light (100μmol m^-2 s^-9. Data were collected from the second leaves on the percentage of withering and the levels of endogenous silicon, malondialdehyde (MDA), hydrogen peroxide (H202), superoxide radical (O2^.-), superoxide dismutase (SOD, EC 1.***.1.1), glutathione peroxidase (GSH-Px, EC 1.***.1.9), ascorbate peroxidase (APX, EC 1.***.1.11), monodehydroascorbate reductase (MDHAR, EC 1.***.5.4), glutathione reductase (GR, EC 1.***.4.2), reduced glutathione (GSH) and ascorbate (AsA). Compared to normal temperatures, chilling resulted in partially withered leaves and increased MDA content. When 0.1 or 1 mmol L^-1 exogenous silicon was combined with chilling, the withering of the cucumber leaves was reduced relative to the original chilling treatment, while the endogenous silicon content was increased, antioxidants such as SOD, GSH-Px, APX, MDHAR, GR, GSH, and AsA were more active, and the levels of H2O2, O2^.-, and MDA were lower. We propose that exogenous silicon leads to greater deposition of endogenous silicon and thereby increases antioxidant activities and reduces lipid peroxidation induced by chilling.

关键词： antioxidant enzyme chilling Cucumis sativus lipid peroxidation silicon

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Insights into restrictive cardiomyopathy from clinical and animal studies

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Journal of Geriatric Cardiology 2011年第3期8卷 168-183页

作者： Pierre-Yves Jean-Charles Yue-Jin Li Chang-Long Nan xu-pei Huang Department of Biomedical Science College of Medicine Florida Atlantic University 777 Glades Road Boca Raton FL 33431 USA

Cardiomyopathies are diseases that primarily affect the myocardium, leading to serious cardiac dysfunction and heart failure. Out of the three major categories of cardiomyopathies （hypertrophic, dilated and restrictive）, restrictive cardiomyopathy （RCM） is less common and also the least studied. However, the prognosis for RCM is poor as some patients dying in their childhood. The molecular mechanisms behind the disease development and progression are not very clear and the treatment of RCM is very difficult and often ineffective. In this article, we reviewed the recent progress in RCM research from the clinical studies and the translational studies done on diseased transgenic animal models. This will help for a better understanding of the mechanisms underlying the etiology and development of RCM and for the design of better treatments for the disease.

关键词： etiology myocardial gene mutation restrictive cardiomyopathy transgenic mice

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Pathological significance of tRNA-derived small RNAs in neurological disorders

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Neural Regeneration Research 2020年第2期15卷 212-221页

作者： Chuan Qin pei-pei xu Xin Zhang Chao Zhang Chang-Bin Liu De-Gang Yang Feng Gao Ming-Liang Yang Liang-Jie Du Jian-Jun Li School of Rehabilitation Medicine Capital Medical UniversityBeijingChina China Rehabilitation Science Institute BeijingChina Center of Neural Injury and Repair Beijing Institute for Brain DisordersBeijingChina Department of Spinal and Neural Functional Reconstruction China Rehabilitation Research CenterBeijingChina Beijing Key Laboratory of Neural Injury and Rehabilitation BeijingChina

Non-coding RNAs(ncRNAs) are a type of RNA that is not translated into proteins. Transfer RNAs(tRNAs), a type of ncRNA, are the second most abundant type of RNA in cells. Recent studies have shown that tRNAs can be cleaved into a heterogeneous population of ncRNAs with lengths of 18–40 nucleotides, known as tRNA-derived small RNAs(tsRNAs). There are two main types of tsRNA, based on their length and the number of cleavage sites that they contain: tRNA-derived fragments and tRNA-derived stress-induced RNAs. These RNA species were first considered to be byproducts of tRNA random cleavage. However, mounting evidence has demonstrated their critical functional roles as regulatory factors in the pathophysiological processes of various diseases, including neurological diseases. However, the underlying mechanisms by which tsRNAs affect specific cellular processes are largely unknown. Therefore, this study comprehensively summarizes the following points:(1) The biogenetics of tsRNA, including their discovery, classification, formation, and the roles of key enzymes.(2) The main biological functions of tsRNA, including its miRNA-like roles in gene expression regulation, protein translation regulation, regulation of various cellular activities, immune mediation, and response to stress.(3) The potential mechanisms of pathophysiological changes in neurological diseases that are regulated by tsRNA, including neurodegeneration and neurotrauma.(4) The identification of the functional diversity of tsRNA may provide valuable information regarding the physiological and pathophysiological mechanisms of neurological disorders, thus providing a new reference for the clinical treatment of neurological diseases. Research into tsRNAs in neurological diseases also has the following challenges: potential function and mechanism studies, how to accurately quantify expression, and the exact relationship between tsRNA and miRNA. These challenges require future research efforts.

关键词： epigenetics molecular biology neurological disorders review sequencing stress tRNA tRNA-derived fragments tRNA-derived small RNAs tRNA-derived stress-induced RNA

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Microalgae cultivation and culture medium recycling by a two-stage cultivation system

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Frontiers of Environmental Science & Engineering 2018年第6期12卷 145-154页

作者： Xinfeng Wang Lu Lin Haifeng Lu Zhidan Liu Na Duan Taili Dong Hua Xiao Baoming Li pei xu Laboratory of Environment-Enhancing Energy (E2E) Key Laboratory of Agricultural Engineering in Structure and EnvironmentMinistry of AgricultureCollege of Water Resources and Civil EngineeringChina Agricultural UniversityBeijing 100083China Beijing Engineering Research Center for Animal Healthy Environment Beijing 100083China Department of Civil Engineering New Mexico State UniversityLas CrucesNM 88003USA Shandong Minhe Biotechnology Limited Company Yantai 265600China School of Engineering Cardiff UniversityQueen's BuildingCardiffCF243AAUK

A two-stage system was designed for microalgae cultivation and nutrients removal. Two species of microalgae were cultivated for biomass production. UF costed less than centrifuge for harvesting microalgae at small sca... 详细信息

关键词： Microalgae harvest Ultrafiltration Poultry wastewater Nutrient removal Two stage cultivation

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Splenocaval versus mesocaval shunt with artificial vascular graft for the treatment of Budd-Chiari syndrome

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Hepatobiliary & Pancreatic Diseases International 2005年第1期4卷 68-70页

作者： Xiao-Wei Dang pei-Qin xu Xiu-Xian Ma Deparment of General Surgery First Affiliated Hospital Zhengzhou University Zhengzhou 450052 China. dangxw1001@***

BACKGROUND:Budd-Chiari syndrome (B-CS) is a disease with a poor prognosis, and the results of medication are not satisfactory. Surgical treatments are widely used to depress portal hypertension and hypertension of the inferior vena cava. Splenocaval shunt is usually applied to treat intrahepatic portal hypertension, but we used this method to treat patients with B-CS successfully.METHODS:The clinical data of 72 B-CS patients (type II), including 26 patients treated with splenocaval shunt (splenocaval group) and 46 patients with mesocaval C-shape shunt (mesocaval group) were analyzed retrospectively.RESULTS:The platelet count of the splenocaval group increased significantly after operation (P0.05). Twenty patients in the splenocaval group and 36 in the mesocaval group were followed up for 6 months to 3.5 years, showing the effective rates of 90.0% and 91.7% respectively in the two groups. The occurrence of hepatic encephalopathy was 5.0% and 5.6% respectively in both groups, but there was no recurrent hemorrhage.CONCLUSIONS:Splenocaval shunt can effectively control B-CS, decrease FPP, prevent upper gastrointestinal hemorrhage, and eradicate hypersplenia. Its efficacy is similar to that of mesocaval shunt in treatment of B-CS.

关键词： hepatic veins thrombosis splenocaval shunt mesocaval shunt

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Decreasing the CTE of Thermoplastic Polyimide by Blending with a Thermosetting System

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Chinese Journal of Polymer Science 2023年第6期41卷 956-961,I0010页

作者： Yu-Cheng Zi Gao-Jie Wu Dong-xu pei Shu Guo Sheng-Li Qi Guo-Feng Tian De-Zhen Wu Key Laboratory of Carbon Fiber and Functional Polymers(Beijing University of Chemical Technology) Ministry of EducationBeijing 100029 China Institute of Analysis and Testing Beijing Academy of Science and Technology(Beijing Center For Physical&Chemical Analysis)Beijing 100089China

A series of thermoplastic polyimide resins with a low coefficient of thermal expansion(CTE)were prepared by blending a rigid resin system 3,3’,4,4’-biphenyltetracarboxylic dianhydride(BPDA)/p-phenylenediamine(PDA)with a flexible resin system 4,4’-[isopropylidenebis(pphenyleneoxy)]diphthalic anhydride(BPADA)/*** effects of the blending ratio on the macromolecular coil size,free volume,and CTE of the mixed system were *** mixing is carried out in the prepolymer poly(amide acid)(PAA)stage,which makes the two systems more compatible and is conducive to the formation of a semi-interpenetrating network structure between the rigid molecular chains and flexible molecular *** flexible structure of the BPADA/PDA system is used to ensure the melt processing *** rigid characteristics of the BPDA/PDA system can inhibit the movement of molecular chains and reduce the free volume fraction,thereby reducing the CTE *** the rigid system content reaches 30%,the CTE can be reduced to 38 ppm/*** method provides a new approach for studying low CTE thermoplastic polyimide resins.

关键词： value. system chains

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