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Recent Advances on Surface-modified Biomaterials Promoting Selective Adhesion and Directional Migration of Cells

Chinese Journal of Polymer Science 2021年第7期39卷 815-823页

作者： chen-Xi tu Chang-You Gao MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027China

The surfaces and interfaces of biomaterials interact with the biological systems in multi-scale levels,and thereby influence the biological functions and comprehensive performance in vitro and in *** particular,a surface promoting the selective adhesion and directional migration of desired types of cells in complex environment is extremely important in the repair and regeneration of tissues such as peripheral nerve and blood vessel,and long-term application of intracorporal devices such as intravascular ***,surface modification of biomaterials is a facile and effective method to achieve the desired cell-biomaterials *** this short review,recent advances on the surface modification of biomaterials to regulate selective cell adhesion and migration are briefly *** particular,the surface properties of biomaterials are manipulated via the convenient introduction of amino groups to the ester-based polymers,the formation of polyelectrolyte multilayers,and the fabrication of topology and gradient cues,etc.,followed by the association of chemical and biological signals such as collagen,heparin,hyaluronic acid,peptides and cell growth *** selective adhesion and directional migration of various types of cells such as endothelial cells(ECs),smooth muscle cells(SMCs),hepatocytes and Schwann cells(SCs)are achieved over the competitive counterpart cells by the use of cell-resisting substances and cell-selective motifs on gradient substrates in most *** advances on cell behaviors in three-dimensional(3D)ceH-extracellular matrix(ECM)-mimicking substrates are also reviewed.

关键词： Biomaterials Surface modification Gradient Cell migration Cell selectivity

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Fabrication, characterization and evaluation of mesoporous activated carbons from agricultural waste： Jerusalem artichoke stalk as an example

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Frontiers of Environmental Science & Engineering 2015年第2期9卷 206-215页

作者： Lei YU chen tu Yongming LUO Key Laboratory of Soil Environment and Pollution Remediation Institute of Soil Science Chinese Academy of Sciences N anjing 210008 China Key Laboratory of Coastal Zone Environmental Processes Institute of Coastal Zone Research Chinese Academy of Sciences Yantai 264003 China Department of Environmental Engineering Nanjing Forestry University Nanjing 210037 China

This work explores the feasibility of Jerusalem artichoke stem （JAS）, an agricultural waste, as an alternative precursor for fabrication of mesoporous activated carbon （MAC） via conventional ZnC12 activation. The as-prepared JAS-MACs were characterized by thermogravimetric, nitrogen gas adsorption isotherm and high resolution scanning electron microscopy analysis. The interacting effects of chemical dosage, activation temperature and time on the mesoporosity, mesopore volume and carbon yield were investigated, and further optimized by response surface methodology （RSM）. The Brunauer-Emmett-Teller surface area, mesoporosity and mesopore volume of the JAS-MAC prepared under optimum condition were identified to be 1631 m^2·g ^-1, 90.16% and 1.11 cm3·g ^-1, respectively. Compared with commercial activated carbons, this carbon exhibited a comparable monolayer adsorption capacity of 374.5 mg .g 1 for Methylene Blue dye. The findings suggest that RSM could be an effective approach for optimizing the pore structure of fabricated activated carbons.

关键词： mesoporous activated carbon response sur-face methodology adsorption isotherm agricultural wastes

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Reductive dechlorination of polychlorinated biphenyls is coupled to nitrogen fixation by a legume-rhizobium symbiosis

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Science China Earth Sciences 2018年第3期61卷 285-291页

作者： chen tu Yongming LUO Ying TENG Peter CHRISTIE Key Laboratory of Coastal Environmental Processes and Ecological Remediation Yantai Institute of Coastal Zone ResearchChinese Academy of Sciences Key Laboratory of Soil Environment and Pollution Remediation Institute of Soil ScienceChinese Academy of Sciences

Chlorinated persistent organic pollutants, including polychlorinated biphenyls （PCBs）, represent a particularly serious environmental problem and human health risk worldwide. Leguminous plants and their symbiotic bacteria （rhizobia） are important components of the biogeochemical cycling of nitrogen in both agricultural and natural ecosystems. However, there have been relatively few detailed studies of the remediation of PCB-contaminated soils by legume-rhizobia symbionts. Here we report for the first time evidence of the reductive dechlorination of 2,4,4＇-trichlorobiphenyl （PCB 28） by an alfalfa-rhizobium nitrogen fixing symbiont. Alfalfa （Medicago sativa L.） inoculated with wild-type Sinorhizobiurn meliloti had significantly larger biomass and PCB 28 accumulation than alfalfa inoculated with the nitrogenase negative mutant rhizobium SmY. Dechlorination products of PCB 28, 2,4＇-dichlorobiphenyl （PCB 8）, and the emission of chloride ion （C1-） were also found to decrease significantly in the ineffective nodules infected by the mutant strain SmY. We therefore hypothesize that N2-fixation by the legume-rhizobium symbiont is coupled with the reductive dechlorination of PCBs within the nodules. The combination of these two processes is of great importance to the biogeochemical cycling and bioremediation of organochlorine pollutants in terrestrial ecosystems.

关键词： Biogeochemical cycling Legume-rhizobia symbiosis Microbe-assisted phytoremediation Nitrogen fixation,Polychlorinated biphenyls Soil pollution and remediation Reductive dechlorination

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Thermodynamic cycle analysis of solid propellant air-turbo-rocket

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航空动力学报 2009年第2期24卷 269-276页

作者： chen Xiang chen Yu-chun tu Qiu-ye ZHANG Hong CAI Yuan-hu School of Power and Energy Northwestern Polytechnical University Xi'an 710072 China

Solid propellant air-turbo-rocket(SPATR) is an air-breathing propulsion system.A numerical model of performance and characteristics analysis for SPATR was presented and the corresponding computer program was written according to the operation characteristics of *** influence on the SPATR performance at design point caused by the gas generator exit parameters and compressor pressure ratio had been computed and analyzed in *** off-design performance of SPATR at sea level and high altitude had also been *** performance of thrust and specific impulse for SPATR with different solid propellant had been compared at off-design points,and the off-design performance comparison had been made between fuel-rich and *** computation results indicated that SPATR operates within wide range of Mach number(0~3) and altitude(0~12 km),and SPATR possesses high specific thrust(1 200 N/(kg/s)) and high specific impulse(7 000 N/(kg/s)) when fuel-air ratio of combustor equals fuel-air ratio.

关键词：空气涡轮火箭压缩机压力固体推进剂设计方案

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Multisensor information fusion:Future of environmental perception in intelligent vehicles

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Journal of Intelligent and Connected Vehicles 2024年第3期7卷 163-176页

作者： Yongsheng Zhang chen tu Kun Gao Liang Wang CRRC Qishuyan Institute Co. Ltd.Changzhou 213011China School of Information Science and Engineering Southeast UniversityNanjing 211189China Department of Architecture and Civil Engineering Chalmers University of TechnologyGothenburg SE-41296Sweden School of Vehicle and Mobility Tsinghua UniversityBeijing 100084China

As urban transportation increasingly impacts daily life,efficiently utilizing traffic resources and developing public transportation have become crucial for addressing issues such as congestion,frequent accidents,and noise *** rapid advancement of intelligent autonomous driving technologies,particularly environmental perception technologies,offers new directions for solving these *** review discusses the application of multisensor information fusion technology in environmental perception for intelligent vehicles,analyzing the components and performance of various sensors and their specific applications in autonomous *** multisensor information fusion,the accuracy of environmental perception is enhanced,optimizing decision support for autonomous driving systems and thereby improving vehicle safety and driving *** study also discusses the challenges faced by information fusion technology and future development trends,providing references for further research and application in intelligent transportation systems.

关键词： intelligent vehicles environmental perception multisensor information fusion autonomous driving traffic safety

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Synthesis,Crystal Structure and Cytotoxic Activity of a New N-Vinyl-1H-dibenzo[a,c]carbazole Derivative of the Dehydroabietic Acid

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Chinese Journal of Structural Chemistry 2013年第12期32卷 1904-1910页

作者： GU Wen HAO Yun chen Hong-tu WANG Shi-Fa Jiangsu Key Lab of Biomass-based Green Fuels and Chemicals College of Chemical EngineeringNanjing Forestry University

The title compound （C29H33NO2, 3） was synthesized and structurally characterized by elemental analysis, IR, MS, 1H- and 13C-NMR and single-crystal X-ray diffraction. The crystal is of monoclinic system, space group P21 with a = 14.428（3）, b = 7.3440（15）, c = 22.768（5） A, β = 95.17（3）°, V = 2402.7（8） A3, Z = 4, Mr = 427.56, Dc = 1.182 g/cm3, F （000） = 920, 2（MoKa） = 0.71073 A,μ = 0.073 mm-1, the final R= 0.0670 and wR= 0.1002 for 2437 reflections with I〉 2σ（I） Two crystallographically independent molecules with different conformations co-exist in the structure. The crystal structure is stabilized by intermolecular C-H…π interactions which make the molecules stack along the b axis. In addition, the preliminary cytotoxic assay showed that the title compound exhibited moderate inhibitory activity against KB and SW1116 cells.

关键词： dehydroabietic acid crystal structure 1H-dibenzo[a,c]carbazole cytotoxic activity

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Decomposition Reaction of Mixed Rare Earth Concentrate and Roasted with CaO and NaCl

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Journal of Rare Earths 2004年第Z1期22卷 53-56页

作者： Wu Wenyuan Hu Guangyong Sun Shuchen chen Xudong tu Ganfeng School of Material and Metallurgy Northeastern University Shenyang 110004 China School of Material and Metallurgy Northeastern University Shenyang 110004 China School of Material and Metallurgy Northeastern University Shenyang 110004 China School of Material and Metallurgy Northeastern University Shenyang 110004 China School of Material and Metallurgy Northeastern University Shenyang 110004 China

The reaction of the mixed rare earth concentrate including monazite ( REPO4 ) and bastnaesite ( REFCO3 )decomposed by CaO and NaCl additives at the temperature range from 100 to 1000 ℃ was studied by means of XRD and *** results show that when CaO and NaCl are not added, only REFCO3 can be decomposed at the temperature of 377 ～ 450 ℃.The decomposition products include REOF, RE2O3 and ***, REFCO3 can not be *** CaO is added, the decomposition reactions occur at the temperature range from 660 to 750 ℃.CaO has three decomposition functions: ( 1 ) REPO4 can be decomposed by CaO and the decomposition products include RE2O3 and Ca3 (PO4)2; (2) CaO can decompose REOF, and the decomposition products are RE2O3 and CaF2; (3)CaO can decompose REPO4 with CaF2, and the decomposition products are RE2 O3, Ca5 F( PO4 )*** decomposition ratio of the mixed rare earth concentrate increased obviously, when CaO and NaC1 were ***1 can supply the liquid for the reaction, improve the mass transfer process and accelerate the *** the same time, NaC1 participated in the reaction that REPO4 was decomposed by CaO.

关键词： metallurgy technology rare earth concentrate decomposition reaction calcium oxide sodium chloride

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Spatial interpolation of orchard soil pH using soil type and planting duration as auxiliary information

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Pedosphere 2020年第5期30卷 628-637页

作者： Chuancheng FU Haibo ZHANG chen tu Lianzhen LI Xinghua LIU Yongming LUO CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation Yantai Institute of Coastal Zone ResearchChinese Academy of SciencesYantai 264003(China) University of Chinese Academy of Sciences Beijing 100049(China)

Intensified field management in orcahrds has resulted in significant and widespread acidification in the ***,effectively mapping the spatial patterns of soil pH aiming to support ecological management is impeded by its large variotions across soil types and planting *** methods were used to integrate soil type and planting duration information for effective mapping of orchard soil pH in a case study in orchards of the Northeast Jiaodong Peninsula,East China.A total o f 1472 surface soil samples were collected,and the planting duration o f each sampled orchard was acquired to generate a planting duration map via Voronoi *** performance of five kriging methods was compared,namely,ordinary kriging(OK),OK combined with soil type(OK_ST),OK combined with planting duration(OK_PD),cokriging combined with soil type and planting duration(OCK_STPD),and OK combined with soil type and planting duration(OK_STPD).Results showed that soil pH declined significantly with increasing planting duration and exhibited moderate spatial variability over the study *** type and planting duration both had significant influence on the spatial distribution of soil *** OCK_STPD and OK_STPD methods showed better prediction efficiency than OK,OK_ST,or OK_*** regard to the predicted maps of soil pH,the OCK_STPD and OK_STPD methods highly reflected local variations associated with soil type and planting duration,but the OK method was poorly *** soil type and planting duration information may be used as ancillary information to improve the mapping quality o f orchard soil *** OCK_STPD and OK_STPD methods were practical and efficient methods for interpolating orchard soil pH in the study *** resultant high-quality soil pH maps can contribute to improved site-specific management in the orchards.

关键词： Jiaodong Peninsula cokriging kriging orchard soil properties soil acidification soil map

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Systematic analysis and modeling of the FLASH sparing effect as a function of dose and dose rate

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Nuclear Science and Techniques 2024年第10期35卷 51-58页

作者： Qi-Bin Fu Yan Zhang Yu-cheng Wang tu-chen Huang Hong-Yu Zhu Xiao-Wu Deng Sino-French Institute of Nuclear Engineering and Technology Sun Yat-sen UniversityZhuhai 519082China Department of Radiation Oncology State Key Laboratory of Oncology in South ChinaCollaborative Innovation Center for Cancer MedicineSun Yat-sen University Cancer CenterGuangzhou 510060China

Ultrahigh-dose-rate radiotherapy(FLASH-RT)is a revolutionary radiotherapy technology that can spare normal tissues without compromising tumor *** qualitative experimental results have been reported,quantitative and systematic analysis of data is ***,the FLASH effect response model to the dose or dose rate is still *** study investigated the relationships between the FLASH effect and experimental parameters,such as dose,dose rate,and other factors by analyzing published in vivo experimental data from animal *** data were modeled based on logistic regression analysis using the sigmoid *** model was evaluated using prediction accuracy,receiver operating characteristic(ROC)curve,and area under the ROC *** showed that the FLASH effect was closely related to the dose,mean dose rate,tissue type,and corresponding biological *** dose rate corresponding to a 50% probability of triggering cognitive protection in the brain was 45 Gy s^(-1).The dose rate corresponding to a 50% probability of triggering intestinal crypt survival and regeneration was 140 Gy s^(-1).For the skin toxicity effect,the dose corresponding to a 50% probability of triggering the FLASH effect was 24 *** study helps to characterize the conditions underlying the FLASH effect and provides important information for optimizing experiments.

关键词： FLASH radiotherapy Sparing effect Systematic analysis Dose rate Dose Biological endpoints

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Influence of La and RE on the Underside Shrinkage of ZA27 Alloy

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Journal of Rare Earths 1999年第2期17卷 47-51页

作者： chen Yungui, tu Mingjing, Shen Baoluo, Gao Shengji (Department of Metal Materials, Sichuan University, chengdu 610065, China) Department of Metal Materials Sichuan University Chengdu 610065 China

The effect of pure La and mischmetal(RE) on underside shrinkage of ZA27 alloy with cooling rate of 32 min-1 was investigated. The results show that the volumes of the underside shrinkage and the total shrinkage(underside shrinkage plus internal shrinkage) of the alloy decrease as the content of La or RE increases. When the contents of La and RE exceed 03%04%(mass fraction) respectively, the underside shrinkage is eliminated and the internal shrinkage moves upwards gradually. The mechanism that the underside shrinkage is eliminated is the falling of La and RE compounds and their accumulation on the bottom of the ZA27 alloy sample. Since La and RE can not effectively prevent phases(Al base solid solution) in the alloy from rising, the internal shrinkage is still close to the bottom of the ZA27 sample.

关键词： Rare earths Lanthanum Zinc base alloy Underside shrinkage

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