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| 1 | Assessing the health risk of heavy metals in vegetables to the general population in Beijing,China显示文摘A systematic survey of As, Cd, Cr, Cu, Ni, Pb and Zn concentrations in vegetables from 416 samples (involving 100 varieties) in Beijing was carried out for assessing the potential health risk to local inhabitants. The results indicated that the metal concentrations in vegetables ranged from < 0.001 to 0.479 μg/g fresh weight (fw) (As), < 0.001 to 0.101 μg/g fw (Cd), < 0.001 to 1.04 μg/g fw (Cr), 0.024 to 8.25 μg/g fw (Cu), 0.001 to 1.689 μg/g fw (Ni), < 0.001 to 0.655 μg/g fw (Pb) and 0.01 to 25.6 μg/g fw (Zn), with average concentrations of 0.013, 0.010, 0.023, 0.51, 0.053, 0.046 and 2.55 μg/g fw, respectively. The results showed that the concentrations of As, Cr, Cu, Cd, Pb and Ni in vegetables from open-fields were all significantly higher than those grown in greenhouses. In addition, in local-produced vegetables, all HMs except Zn were significantly higher than those in provincial vegetables. The estimated daily intake (EDI) of As, Cd, Cr, Cu, Ni, Pb and Zn from vegetables was 0.080, 0.062, 0.142, 3.14, 0.327, 0.283 and 15.7 μg/(kg body weight (bw)·d) for adults, respectively. Arsenic was the major risk contributor for inhabitants since the target hazard quotient based on the weighted average concentration (THQw) of arsenic amounted to 44.3% of the total THQ (TTHQ) value according to average vegetable consumption. The TTHQ was lower than 1 for all age groups, indicating that it was still safe for the general population of Beijing to consume vegetables. | SONG Bo LEI Mei CHEN Tongbin ZHENG Yuanming XIE Yunfeng LI Xiaoyan GAO Ding | 2009 | Journal of Environmental Sciences2009，21，12： | 45 |
| 2 | An Archean continental block in the Taihangshan and Hengshan regions: Constraints from geochronology and geochemistry显示文摘Recent research on the tectonothermal evolution and geochronology in the Fuping, Hengshan and Wutaishan metamorphic complexes, together with the discoveries of a high-pressure granulite belt in the northern margin of the North China Craton (NCC) and high-pressure metapelites in the Jingangku Group of the Wutaishan complex, suggests that there was a Neoarchean to Paleoproterozoic orogenic belt related to collision between the Eastern and Western continental blocks. Comparison of geological, geochronological, tectonothermal and geochemical data between the Fuping and Hengshan complexes suggests these two complexes most likely originated and evolved as a single lithotectonic domain (i.e., the Taihangshan-Hengshan block) during the early evolution of the North China Craton, probably as an active margin to the Eastern Continental Block. The Taihangshan-Hengshan block has been subjected to intensive and extensive tectono-magmatism and high-grade metamorphism related to collision between the Eastern and Western continental blocks at ~1.80 Ga. | LIU Shuwen , LI Jianghai, PAN Yuanming, ZHANG Jian and LI Qiugen(1. The Key Laboratory of Orogenic Belts and Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing 100871, China 2. Department of Geological Sciences, University of Saskatchewan, Saskatoon, SK S7N 5E2, Canada) | 2002 | Progress in Natural Science:Materials International2002，12，8： | 32 |
| 3 | Responses of microbial activities and soil physical-chemical properties to the successional process of biological soil crusts in the Gurbantunggut Desert,Xinjiang显示文摘Biological soil crusts(BSCs) are capable of modifying nutrient availability to favor the establishment of biogeochemical cycles. Microbial activities serve as critical roles for both carbon and nutrient transformation in BSCs. However, little is known about microbial activities and physical-chemical properties of BSCs in the Gurbantunggut Desert, Xinjiang, China. In the present research, a sampling line with 1-m wide and 20-m long was set up in each of five typical interdune areas selected randomly in the Gurbantunggut Desert. Within each sampling line, samples of bare sand sheet, algal crusts, lichen crusts and moss crusts were randomly collected at the depth of 0–2 cm. Variations of microalgal biomass, microbial biomass, enzyme activities and soil physical-chemical properties in different succession of BSCs were analyzed. The relationships between microalgal biomass, microbial biomass, enzymatic activities and soil physical-chemical properties were explored by stepwise regression. Our results indicate that microalgal biomass, microbial biomass and most of enzyme activities increased as the BSCs developed and their highest values occurred in lichen or moss crusts. Except for total K, the contents of most soil nutrients(organic C, total N, total P, available N, available P and available K) were the lowest in the bare sand sheet and significantly increased with the BSCs development, reaching their highest values in moss crusts. However, pH values significantly decreased as the BSCs developed. Significant and positive correlations were observed between chlorophyll a and microbial biomass C. Total P and N were positively associated with chlorophyll a and microbial biomass C, whereas there was a significant and negative correlation between microbial biomass and available P. The growth of cyanobacteria and microorganism contributed C and N in the soil, which offered substrates for enzyme activities thus increasing enzyme activities. Probably, improvement in enzyme activities increased soil fertility and promoted the growth of cyanobacteria, eukaryotic algae and heterotrophic microorganism, with the accelerating succession of BSCs. The present research found that microalgal-microbial biomass and enzyme activities played important roles on the contents of nutrients in the successional stages of BSCs and helped us to understand developmental mechanism in the succession of BSCs. | BingChang ZHANG XiaoBing ZHOU YuanMing ZHANG | 2015 | Journal of Arid Land2015，7，1： | 23 |
| 4 | Leaf N and P stoichiometry of 57 plant species in the Karamori Mountain Ungulate Nature Reserve,Xinjiang,China显示文摘Nitrogen(N) and phosphorus(P) are the major nutrients that constrain plant growth and development,as well as the structure and function of ecosystems.Hence,leaf N and P patterns can contribute to a deep understanding of plant nutrient status,nutrient limitation type of ecosystems,plant life-history strategy and differentiation of functional groups.However,the status and pattern of leaf N and P stoichiometry in N-deficiency desert ecosystems remain unclear.Under this context,the leaf samples from 57 plant species in the Karamori Mountain Ungulate Nature Reserve,eastern Junggar Desert,China were investigated and the patterns and interrelations of leaf N and P were comparatively analyzed.The results showed that the average leaf N concentration,P concentration,and N:P ratio were 30.81 mg/g,1.77 mg/g and 17.72,respectively.This study found that the leaf N concentration and N:P ratio were significantly higher than those of studies conducted at global,national and regional scales;however,the leaf P concentration was at moderate level.Leaf N concentration was allometrically correlated with leaf P and N:P ratio across all species.Leaf N,P concentrations and N:P ratio differed to a certain extent among plant functional groups.C_4 plants and shrubs,particularly shrubs with assimilative branches,showed an obviously lower P concentration than those of C_3 plants,herbs and shrubs without assimilative branches.Shrubs with assimilative branches also had lower N concentration.Fabaceae plants had the highest leaf N,P concentrations(as well as Asteraceae) and N:P ratio;other families had a similar N,P-stoichiometry.The soil in this study was characterized by a lack of N(total N:P ratio was 0.605),but had high N availability compared with P(i.e.the available N:P ratio was 1.86).This might explain why plant leaves had high N concentration(leaf N:P ratio>16).In conclusion,the desert plants in the extreme environment in this study have formed their intrinsic and special stoichiometric characteristics in relation to their life-history strategy. | TAO Ye WU Ganlin ZHANG Yuanming ZHOU Xiaobing | 2016 | Journal of Arid Land2016，8，6： | 18 |
| 5 | Experimental investigation of the generation of large-amplitude internal solitary wave and its interaction with a submerged slender body显示文摘A principle of generating the nonlinear large-amplitude internal wave in a stratified fluid tank with large cross-section is proposed according to the‘jalousie’control mode.A new wave-maker based on the principle was manufactured and the experiments on the generation and evolution of internal solitary wave were conducted.Both the validity of the new device and applicability range of the KdV-type internal soliton theory were tested.Furthermore,a measurement technique of hydrodynamic load of internal waves was developed.By means of accurately measuring slight variations of internal wave forces exerted on a slender body in the tank,their interaction characteristics were determined.It is shown that through establishing the similarity between the model scale in the stratified fluid tank and the full scale in the numerical simulation the obtained measurement results of internal wave forces are confirmed to be correct. | WEI Gang DU Hui XU XiaoHui ZHANG YuanMing QU ZiYun HU TianQun YOU YunXiang | 2014 | Science China(Physics,Mechanics & Astronomy)2014，57，2： | 17 |
| 6 | Numerical analysis for cooling effect of open boundary ripped-rock embankment on Qinghai-Tibetan railway显示文摘The heat convection of fluid inside the ballast layer and ripped-rock layer, which are re- garded as porous media in railway embankment, is a process of heat and mass transfer. At present, the ripped-rock embankment, as a new type of embankment structure, has widely been used in the construction of Qinghai-Tibetan railway. However, because its ripped-rock layer is almost open in two bilateral boundaries and closed at top and bottom, and air can flow into/out of the ballast layer and ripped-rock layer, the convection and transfer heat patterns are very complicated in the embankment. Therefore, based on the temperature and geology conditions of the Qinghai-Tibetan Plateau, a nu- merical approach of the unsteady two-dimensional continuity, momentum (non-Darcy flow) and en- ergy equations of heat convection for incompressible fluid in porous media is provided to analyze the velocity and temperature characteristics of the ripped-rock embankment with different embankment heights under open boundary condition for the coming 50 years in this paper. The calculated results indicate that, due to the influence of the outside wind, the convective heat transfer mainly relies on the forced convection in the open ripped-rock embankment. Even if the air temperature will be warmed up by 2.6℃ in the coming 50 years, it still has a better cooling effect on the underlying soils and a low temperature frozen-soil core is formed in the permafrost below it if the embankment is constructed in the regions whose present mean annual air temperature is ?4.0℃. Furthermore, the cooling effect of high ripped-rock embankment is better than that of low embankment. This is because the wider bot- tom of high embankment has a more influence dimension on the underlying frozen soil. However, cardinal winds on the Qinghai-Tibetan Plateau disturb its convection pattern, so that an asymmetric temperature distribution occurs under high embankment and it is possible to induce a transverse un- even deformation of embankment, but no similar situation occurs under low embankment. This asymmetric temperature field problem should be considered when ripped-rock embankment is de- signed and constructed. | LAI Yuanming ZHANG Mingyi LIU Zhiqiang YU Wenbing | 2006 | Science China Earth Sciences2006，49，7： | 15 |
| 7 | Propagation of plane wave in non-homogeneously saturated soils显示文摘Based on Biot's model for fluid-saturated media,which takes the inertial,fluid viscous,mechanical couplings,compressibility of grains and fluid into account,the dispersion equations of plane waves in non-homogeneously saturated soil are established by using reverberation ray matrix method(RRMM) with the aid of Helmholtz theorem.The non-homogeneity considered is a gradient variation in material properties with depth.The propagation characteristic of elastic waves in non-homogeneously saturated soil is analyzed by numerical example in this paper.The results show that the wave number and dissipation change little for two kinds of compression along the variation direction of the material properties,however,the non-homogeneity has significant effect on the wave number and dissipation of shear wave. | ZHOU FengXi LAI YuanMing SONG RuiXia | 2013 | Science China(Technological Sciences)2013，56，2： | 15 |
| 8 | Ovary cancer incidence and mortality in China, 2011显示文摘Objective: To evaluate and analyze ovary cancer incidence and mortality in China in 2011 using ovary cancer data from population-based cancer registration in China, and to provide scientific information for its control and prevention.Methods: Invasive cases of ovary cancer were extracted and analyzed from the overall Chinese cancer database in 2011, which were based on data from 177 population-based cancer registries distributing in 28 provinces. The crude, standardized, and truncated incidences and mortalities et al. were calculated and new and deaths cases from ovary cancer throughout China and in different regions in 2011 were estimated using Chinese practical population.Results: The estimates of new ovary cancer cases and deaths were 45,223 and 18,430, respectively, in China in 2011. The crude incidence rate, age-standardized rate by Chinese standard population(ASR-C) and agestandardized rate by world standard population(ASR-W) incidence were 6.89/100,000, 5.35/100,000 and 5.08/100,000, respectively; the crude, ASR-C and ASR-W mortalities were 2.81/100,000, 2.01/100,000 and 1.99/100,000, respectively. The incidence and mortality in urban areas were higher than those in rural areas. The age-specific incidence and mortality increased rapidly from age 35-39 and peaked at age 60-64 or 75-79 years. After age 45 or 55, the age-specific incidence and death rates in urban were much higher than those in rural areas. Conclusions: Compared with GLOBOCAN 2012 data, the ovary cancer incidence in China in 2011 was at middle level, but its mortality was at low level worldwide. | Kuangrong Wei Yuanming Li Rongshou Zheng Siwei Zhang Zhiheng Liang Huishan Cen Wanqing Chen | 2015 | Chinese Journal of Cancer Research2015，27，1： | 14 |
| 9 | Species composition,distribution patterns and ecological functions of biological soil crusts in the Gurbantunggut Desert显示文摘As one of the most important biological factors that maintain the stability of the largest fixed and semi-fixed desert in China,the Gurbantunggut Desert,the biological soil crusts (BSCs) develop well and play critical ecological roles in the desert ecosystem. In this paper,we briefly summarize our research findings since 2002 including species composition,distribution pattern and ecological functions of BSCs in the desert. Our results indicate abundant species diversity of BSCs in the Gurbantunggut Desert in comparison to other deserts in China. At the scales of sand dune or whole desert,the distribution patterns of BSCs are location-specific. The existence of BSCs in this desert could:(1) accelerate the formation of desert soil and the weathering of minerals; (2) accumulate organic matter in surface soil through related species in soil crusts; (3) enhance the abilities of sand surface to resist wind erosion; (4) influence seed germination of vascular plants; and (5) enhance the production of dew deposition on sandy soil surface. | Zhang, YuanMing Wu, Nan Zhang, BingChang Zhang, Jing | 2010 | Journal of Arid Land2010，2，3： | 12 |
| 10 | mTORC2 promotes type I insulin-like growth factor receptor and insulin receptor activation through the tyrosine kinase activity of mTOR显示文摘rapamycin (mTOR ) 的哺乳动物的目标是 raptor-mTOR (mTORC1 ) 和控制多样的细胞的进程的 rictor-mTOR (mTORC2 ) 建筑群的一个核心部件。mTORC1 和 mTORC2 类型下游地调整几个元素我像胰岛素的生长因素受体(IGF 红外) 和胰岛素受体(InsR ) 。然而,它是未知的是否并且 mTOR 怎么自己调整 IGF 红外和 InsR。这里,我们证明 mTOR 拥有意外酷氨酸 kinase 活动并且激活 IGF-IR/InsR。Rapamycin 导致酷氨酸 phosphorylation 和 IGF-IR/InsR 的激活,它大部分依赖于 rictor 和 mTOR。而且, mTORC2 支持 IGF-IR/InsR 的导致 ligand 的激活。导致 IGF 、导致胰岛素的 IGF-IR/InsR phosphorylation 显著地在 rictor 空的房间被损害。胰岛素受体底层(红外) 直接与从而招募的 SIN1 交往 mTORC2 到 IGF-IR/InsR 并且支持 IGF-IR/InsR 的导致 rapamycin 或导致 ligand 的 phosphorylation。mTOR poly 向一般酷氨酸 kinase 底层展出酷氨酸 kinase 活动(Glu-Tyr ) 并且 IGF-IR/InsR。Tyr1131/1136 和 Tyr1146/1151 上的 recombinant mTOR 和 immunoprecipitated mTORC2 phosphorylate IGF 红外和 InsR 分别地。这些效果独立于 IGF-IR/InsR 的内在的 kinase 活动,作为在 kinase 死了的 IGF-IR/InsR 异种上由试金决定了。当从 rictor +/+ MCF-10A 房间的 rictor 和 mTOR immunoprecitates 向 IGF 红外和 InsR 展出酷氨酸 kinase 活动时,从 rictor −/− MCF-10A 房间的 mTOR immunoprecipitates 不导致 IGF 红外和 InsR phosphorylation。在 IGF 红外的残余 Tyr1131 或在 InsR 的 Tyr1146 的 Phosphorylation 缺乏的变化由 mTOR 废除 IGF-IR/InsR 的激活。最后, rictor 的 overexpression 支持导致 IGF 的房间增长。我们的工作作为双特性的 kinase 识别 mTOR 并且澄清 mTORC2 怎么支持 IGF-IR/InsR 激活。 | YancunYin Hui Hua Minjing Li Shu Liu Qingbin Kong Ting Shao Jiao Wang Yuanming Luo Qian Wang Ting Luo Yangfu Jiang | 2016 | Cell Research2016，26，1： | 11 |
| 11 | A highly durable catalyst based on CoxMn3-xO4 nanosheets for low-temperature formaldehyde oxidation显示文摘为不稳定的有机化合物(VOC ) 的氧化的划算的催化剂对精力变换应用和环境保护批评。这个过程的主要瓶颈是能氧化的有效、稳定、划算的催化剂的发展在低温度的 HCHO。这里,一致地由锰钴氧化物 nanosheet 数组组成的先进材料在一件碳纺织品上盖住被与帖子退火相结合的一个简单阳极的电极淀积方法成功地制作处理,和罐头直接为 HCHO 作为高效的催化材料被使用消除。得益于增加的表面氧种类和改进氧化还原作用性质,同样准备的锰钴氧化物 nanosheets 为 HCHO 氧化显示出实质地更高的催化活动。催化剂完全在象 100 一样低的温度把 HCHO 变换成公司 2 | Yongchao Huang Kaihang Ye Haibo Li Wenjie Fan FengyiZhao Yuanming Zhang Hongbing Ji | 2016 | Nano Research2016，9，12： | 10 |
| 12 | Characteristics and tectonic setting of volcanic rocks in Early Cretaceous Baiyingaolao Formation of Keyouzhongqi area,Inner Mongolia显示文摘The authors studied zircon LA-ICP-MS U-Pb dating,the zircon Hf isotope and geochemistry of acidic volcanic rocks in Baiyingaolao Formation of Keyouzhongqi area,Inner Mongolia,and discussed the chronology,source region and tectonic setting of the volcanic rocks in the studied area. The clear oscillatory zoning of zircons indicates a typical magmatic origin,and the results of dating show that the volcanic rocks of Baiyingaolao Formation were formed in Early Cretaceous( 121. 5 ± 1. 0 Ma). The features of major and trace elements show that the rocks are alkali-rich,poor in calcium and magnesium with enrichment in LILEs like Th,U,K and Gd and depletion in HFSEs,e. g. Nb,Ta,Sr and Ti. The fact implies that they were the products of partial melting of the crust. εHf( t) =( +6.30--+9.06) and TDM2= 600--835 Ma,suggest the magma originated from partial melting of the young crust. Combined with the evolution of regional tectonic structure,the authors conclude that the acidic volcanic rocks of Baiyingaolao Formation may be formed under the extensional environment related to the subduction of Paleo-Pacific Plate. | KONG Yuanming MA Rui HE Zhonghua YANG Deming WU Qing WANG Yang | 2014 | Global Geology2014，17，2： | 8 |
| 13 | Responses of activities, abundances and community structures of soil denitrifiers to short-term mercury stress显示文摘The responses of activities, abundances and community structures of soil denitrifiers to mercury (Hg) stress were investigated through a short-term incubation experiment. Four soil treatments with different concentrations of Hg (CK, Hg25, Hg50, and Hg100, denoted as 0, 25, 50, and 100 mg Hg/kg dry soil, respectively) were incubated for 28 days. Soil denitrification enzyme activity (DEA) was measured at day 3, 7 and 28. The abundances and community structures of two denitrification concerning genes, nirS (cd1-nitrite reductase gene) and nosZ (nitrous oxide reductase gene), were analyzed using real-time PCR and denaturing gradient gel electrophoresis (DGGE). Results showed that soil DEA was significantly stimulated in the treatments of Hg25 and Hg50 compared with others at day 7. Meanwhile, no difference in the abundances of soil nirS and nosZ was found between Hg spiked treatments and CK, except the lower abundance of nirS (P < 0.05) in the Hg added treatments compared with that in the CK at day 28. The community structures of denitrifiers based on nirS gene presented obvious change at day 7 along with the Hg additions, however, no variation was found in all treatments based on the nosZ gene. The results indicated that Hg (Hg25 and Hg50) had a strongly short-term stimulation on soil DEA, and nirS gene is more sensitive than nosZ gene to Hg stress. | Zhifeng Zhou Yuanming Zheng Jupei Shen Limei Zhang Yurong Liu Jizheng He | 2012 | Journal of Environmental Sciences2012，24，3： | 8 |
| 14 | A NOVEL METHOD FOR MEASURING AND CHARACTERIZING DYNAMIC FRACTURE-INITIATION TOUGHNESS OF ELASTIC-PLASTIC MATERIALS显示文摘The characterization mad testing methods of the dynamic fracture initiation toughness of elas-tic-plastic materials under tensile impact are studied.By using the self-designed bar-bar tensile impact appa-ratus,a novel test method for studying dynamic fracture-initiation has been proposed based on the one-di-mensional test principle.The curve of average load v.s.displacement(-δ)is smooth until unstablecrack propagation,and the kinetic energy which does not contribute to the crack growth can be removed fromtotal work done by external-force to the specimen.The fracture-initiation point is determined by compliance-changing rate method.The results show that these methods are feasible and effective.Through the analysis ofthe conversion between work and energy of a fracture specimen,the dynamic J-integral is adopted as a char-acteristic parameter for elastic-plastic materials under impact loading.The J-integral is calculated from-△and P-δ curves by using the formula proposed by Rice.The J-integral at fracture initiation is employedto describe the dynamic fracture-initiation toughness of elastie-plastic materials and the experimental resultsindicate that J10can be regarded as a material constant. | Gong Nengping Xia Yuanming | 2002 | Acta Mechanica Solida Sinica2002，15，2： | 7 |
| 15 | Temporal-spatial dynamics of distribution patterns of microorganism relating to biological soil crusts in the Gurbantunggut Desert显示文摘生物土壤外壳用作贡献沙固定的一个重要生物因素。这研究被进行在关于地点的外壳中调查微生物的时间空间的可变性,沙沙丘和季节的土壤层。在苔藓主导的内部沙丘的区域,更高的土壤营养素和水集中是可能的维持微生物引起的活动。细菌显示出解决和生长的最高的能力在在春天和秋天内部沙丘。土壤水内容在内部沙丘的区域在土壤外壳中到达了最高的价值,特别在春天。放线菌和真菌的数量的变化基本上在沙沙丘的不同地点显示出一致趋势。与加深土壤层,因为环境因素在春天和秋天波动,每个微生物组的数量的垂直分发显示出不同特征。在不同微生物组之中,细菌是占优势的,在在所有的春天和秋天的放线菌下一个和真菌最少玷污层(020 厘米) 。细菌和土壤水内容的比例比在在所有土壤层(020 厘米) 的秋天的那些在春天是更高的。没有一致趋势在放线菌和真菌被发现。结果证明微生物的数量是显著地积极的与有机物内容相关,土壤水满意的、全部的 N,全部的 P,可得到的 P,可得到的 K, pH,电的传导性,全部的盐内容,过氧化氢酶, urease,磷酸酶和碱的磷酸酶。 | WU Nan WANG Hongling LIANG Shaoming NIE Huali ZHANG Yuanming | 2006 | Chinese Science Bulletin2006，51，A01： | 7 |
| 16 | The influence of biological soil crusts on ^(15)N translocation in soil and vascular plant in a temperate desert of northwestern China显示文摘Aims Desert ecosystems are often characterized by patchy distribution of vascular plants,with biological soil crusts(BSC)covering interplant spaces.However,few studies have comprehensively examined the linkage between BSC and vascular plants through nitrogen(N)or element translocation.the objective of this study was to evaluate the ecological roles of BSC on N translocation from soil to the domi-nant herb Erodium oxyrrhynchum bieb.(geraniaceae)in a temper-ate desert in China.Methods Isotopes(including 15N-glu,15N-NH4Cl and 15N-NaNo3)were used as a tracer to detect translocation of N in two types of desert soil(BSC covered;bare)to the dominant herb E.oxyrrhynchum.three different forms of 15N-enriched N compounds were applied as a point source to small patches of BSC and to bare soil.and we measured isotopes(14N and 15N)and obtained the concentration of labeled-15N in both vascular plants and soils at different distances from substrate application Important Findings Plants of E.oxyrrhynchum growing in BSC-covered plots accumulated moreδ15N than those growing in the bare soil.similarly,soil from b Ccovered plots showed a higher concentration of labeled-N irrespective of form of isotope,than did the bare soil.the concentration of dissolved organic N(15N-glu)in E.oxyrrhynchum was higher than that of dis-solved inorganic N(15N-NH4Cl and 15N-NaNo3).soil covered by BSC also accumulated considerably more dissolved organic N than bare soil,whereas the dominant form of 15N concentrated in bare soil was dissolved inorganic N.Correlation analysis showed that the concentra-tion of labeled-N in plants was positively related to the concentration of labeled-N in soils and the N%recorded in E.oxyrrhynchum.our study supports the hypothesis that BSC facilitates ^(15)N translocation in soils and vascular plants in a temperate desert of northwestern China. | WeiWei Zhuang Alison Downing YuanMing Zhang | 2015 | Journal of Plant Ecology2015，8，4： | 7 |
| 17 | Comparison of Modified Mohr-Coulomb Model and Bai-Wierzbicki Model for Constructing 3D Ductile Fracture Envelope of AA6063显示文摘Ductile fracture of metal often occurs in the plastic forming process of parts.The establishment of ductile fracture criterion can effectively guide the selection of process parameters and avoid ductile fracture of parts during machining.The 3D ductile fracture envelope of AA6063-T6 was developed to predict and prevent its fracture.Smooth round bar tension tests were performed to characterize the flow stress,and a series of experiments were conducted to characterize the ductile fracture firstly,such as notched round bar tension tests,compression tests and torsion tests.These tests cover a wide range of stress triaxiality(ST)and Lode parameter(LP)to calibrate the ductile fracture criterion.Plasticity modeling was performed,and the predicted results were compared with corresponding experimental data to verify the plasticity model after these experiments.Then the relationship between ductile fracture strain and ST with LP was constructed using the modified Mohr-Coulomb(MMC)model and Bai-Wierzbicki(BW)model to develop the 3D ductile fracture envelope.Finally,two ductile damage models were proposed based on the 3D fracture envelope of AA6063.Through the comparison of the two models,it was found that BW model had better fitting effect,and the sum of squares of residual error of BW model was 0.9901.The two models had relatively large errors in predicting the fracture strain of SRB tensile test and torsion test,but both of the predicting error of both two models were within the acceptable range of 15%.In the process of finite element simulation,the evolution process of ductile fracture can be well simulated by the two models.However,BW model can predict the location of fracture more accurately than MMC model. | Jianye Gao Tao He Yuanming Huo Miao Song Tingting Yao Wanbo Yang | 2021 | Chinese Journal of Mechanical Engineering2021，34，2： | 6 |
| 18 | Amplification of the miR-181c/d cluster is inversely correlated with PDCD4 expression in gastric cancer显示文摘miR-181c/d is dysregulated in gastric cancer(GC).We investigated the amplification and expression of miR-181c/d and its predicted target genes in GC.Amplification of miR-181c/d was quantified by genomic real-time PCR in GC and adjacent normal tissues,as well as the levels of mature miR-181c/d was performed by real-time PCR in the same tissues.The potential target genes of miR-181c/d were predicted using bioinformatics software.Expression of one potential target gene,PDCD4,was measured by semiquantitative RT-PCR,real-time PCR,and immunohistochemistry.Next,the relationship between miR181c/d expression and PDCD4 expression was analyzed.Results indicated that the amplification and expression of miR-181c/d were significantly higher in GC than in adjacent normal tissues(primary miR-181c/d,P\0.001;miR-181c,P=0.0344;miR-181d,P=0.0153),and there was a strong correlation between mature miR-181c/d and primary miR-181c/d.Thirty-two target genes were predicted,including PDCD4 which is a known tumor suppressor gene.Expression of PDCD4 was significantly down-regulated in GC as compared to adjacent normal tissues and was inversely correlated with miR-181c/d expression in GC(miR-181c and PDCD4:R=-0.496,P=0.008;miR-181d and PDCD4:R=-0.454,P=0.003).Therefore,miR-181c/d may play a pivotal role in the pathogenesis of GC by downregulating PDCD4 expression. | Yuanming Pan Rui Xing Juan An Jiantao Cui Wenmei Li Mingzhou Guo Youyong Lu | 2014 | Chinese Science Bulletin2014，59，19： | 6 |
| 19 | Quantitative classification and analysis on plant communities in the middle reaches of the Tarim River显示文摘Plant communities were sampled in the lower reaches of the Tarim River, Xinjiang. The results showed that there are 23 species belonging to 21 genera in 11 families, most of which have low occurrence frequency in quadrats. The most common species is Tamarix ramosissima, which occurred in 17 sites accounting for 89.47% of the total 19 sites. Quantitative classification (TWINSPAN) and ordination (CCA) methods were used to study the distribution patterns of 23 plant species in 19 sites in this valley. TWINSPAN results showed that the plant communities in the middle reaches of the Tarim River could be divided into 3 groups and the sampling sites could be divided into 7 types in 3 groups. CCA results were consistent with TWINSPAN results, and showed species distribution patterns correlated with major environmental variables of groundwater level and soil moisture. | ZHANG Yuanming,CHEN Yaning,ZHANG Daoyuan(Xinjiang Institute of Ecology and Geography, CAS, Urumqi 830011, China) | 2003 | Journal of Geographical Sciences2003，13，2： | 5 |
| 20 | Antibacterial activity of Cu_2O and Ag co-modified rice grains-like ZnO nanocomposites显示文摘In this work, a series of Cu_2O-Ag/ZnO, Cu_2O/ZnO and Ag/ZnO nanocomposites with various compositions were prepared via a hydrothermal method followed by chemical modification, and their antibacterial performance was investigated in detail. X-ray powder diffraction, scanning electron microscopy and transmission electron microscopy results confirmed that 31 nm Cu20 and 30 nm Ag nanoparticles are well-dispersed on 202 nm ZnO grains to form a Cu_2O/ZnO and Ag/ZnO heterojunction, respectively. The bi-heterojuction structure in the Cu20-Ag/ZnO provided a synergistic effect on antibacterial activity, and the(Cu_2O)_(0.04)Ag_(0.06)ZnO_(0.9) nanocomposites showed the highest antimicrobial activity of all samples with minimum inhibitory concentration and minimum bactericidal concentration against Escherichia coli and Staphylococcus aureus as low to 31.25 μg/mL, 250μg/mL, 125μg/mL and 500μg/mL, respectively. This is the first report of the antibacterial activities of Cu_2O and Ag co-modified ZnO nanocomposites. | Dunhua Hong Guangzhong Cao Junle Qu Yuanming Deng Jiaonin Tang | 2018 | Journal of Materials Science & Technology2018，34，12： | 5 |
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