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1Characteristics and environmental significance of Ca, Mg, and Sr in the soil infiltrating water overlying the Furong Cave,Chongqing, China显示文摘This paper explores the influence of the local meteoric conditions,the overlying soil on the concentrations of Ca,Mg,and Sr,and the ratios of Mg/Ca,Sr/Ca,and Mg/Sr in soil infiltrating water(SIW).An in situ monitoring program was carried out above the Furong Cave throughout 2010 to collect data on SIW,monthly temperature and rainfall,and the geochemical composition and granularity of soils.The discharge of SIW responded quickly to the local rainfall,and its residence time was the primary factor affecting the Ca,Mg,and Sr content of the SIW.The high concentrations of Ca,Mg,and Sr in the SIW during April should be attributed primarily to the prolonged residence of SIW in the soil during the local dry seasons of winter and early spring.The maximum Mg/Sr ratio also occurred in April.The ratio of Mg/Ca in SIW is positively correlated with prolonged residence time and with high temperatures,which do not strongly affect the ratio of Sr/Ca.The Mg/Ca ratio was lowest when the Sr/Ca ratio was highest because plant metabolism increased the absorption of Ca and Mg,but not Sr,and also because higher temperatures enhanced the dissolution of Mg more than that of Sr.These different responses of Mg and Sr to temperature increases resulted in high Mg/Sr ratios during July and August.LI JunYun LI TingYong WANG JianLi XIANG XiaoJing CHEN YunXuan LI Xuan 2013Science China Earth Sciences2013,56,12:6
2The spatial relationship between salt marsh vegetation patterns,soil elevation and tidal channels using remote sensing at Chongming Dongtan Nature Reserve, China显示文摘The analysis of vegetation-environment relationships has always been a study hotspot in ecology. A number of biotic, hydrologic and edaphic factors have great influence on the distribution of macrophytes within salt marsh.Since the exotic species Spartina alterniflora(S. alterniflora) was introduced in 1995, a rapid expansion has occurred at Chongming Dongtan Nature Reserve(CDNR) in the Changjiang(Yangtze) River Estuary, China.Several important vegetation-environment factors including soil elevation, tidal channels density(TCD),vegetation classification and fractional vegetation cover(FVC) were extracted by remote sensing method combined with field measurement. To ignore the details in interaction between biological and physical process,the relationship between them was discussed at a large scale of the whole saltmarsh. The results showed that Scirpus mariqueter(S. mariqueter) can endure the greatest elevation variance with 0.33 m throughout the marsh in CDNR. But it is dominant in the area less than 2.5 m with the occurrence frequency reaching 98%. S. alterniflora has usually been found on the most elevated soils higher than 3.5 m but has a narrow spatial distribution. The rapid decrease of S. mariqueter can be explained by stronger competitive capacity of S. alterniflora on the high tidal flat. FVC increases with elevation which shows significant correlation with elevation(r=0.30, p<0.001). But the frequency distribution of FVC indicates that vegetation is not well developed on both elevated banks near tidal channels from the whole scale mainly due to tidal channel lateral swing and human activities. The significant negative correlation(r=–0.20, p<0.001) was found between FVC and TCD, which shows vegetation is restricted to grow in higher TCD area corresponding to lower elevation mainly occupied by S. mariqueter communities. The maximum occurrence frequency of this species reaches to 97% at the salt marsh with TCD more than 8 m/m2.ZHENG Zongsheng ZHOU Yunxuan TIAN Bo DING Xianwen 2016Acta Oceanologica Sinica2016,35,4:6
3Mapping sea surface velocities in the Changjiang coastal zone with advanced synthetic aperture radar显示文摘Range Doppler velocities derived from the Envisat advanced synthetic aperture radar(ASAR) wide swath images are analyzed and assessed against the numerically simulated surface current fields derived from the finite volume coastal ocean model(FVCOM) for the Changjiang Estuary. Comparisons with the FVCOM simulations show that the European Space Agency(ESA) Envisat ASAR based Doppler shift anomaly retrievals have the capability to capture quantitative information of the surface currents in the Changjiang Estuary. The uncertainty analysis of the ASAR range Doppler velocity estimates are discussed with regard to the azimuthal and range bias corrections, radar incidence angles, inaccuracy in the wind field corrections and the presence of rain cells.The corrected range Doppler velocities for the Changjiang Estuary area are highly valuable as they exhibit quantitative expressions related to the multiscale upper layer dynamics and surface current variability around the East China Sea, including the Changjiang Estuary.WANG Lihua ZHOU Yunxuan GE Jianzhong JOHANNESSEN Johnny A. SHEN Fang 2014Acta Oceanologica Sinica2014,33,11:5
4Layered double hydroxide-based photocatalytic materials toward renewable solar fuels production显示文摘Photocatalysis is an ideal and promising green technology to drive numerous chemical reactions for valued chemicals production under very mild conditions,thereby providing solutions to global energy and environment issues related to burning fossil fuels.Over the past decade,layered double hydroxides(LDHs),as the members in two-dimensional materials family,have attracted much attention due to their many advantages in photocatalysis,such as facile synthesis,low cost and powerful tunability of composition.In this review,we provide a synthetic overview of recent research advances of LDH-based photocatalysts,with the main discussion of the design strategies to improve their photocatalytic performance,including component control,defect engineering,hybridization,and topological transformation.Structure-performance correlations and tailor-made material synthesis strategies are elaborated to discuss how to realize high-performance LDH-based photocatalysts for three important reactions(i.e.,water splitting,CO_(2)conversion,and N2 reduction)to generate desirable solar fuels.Further,the remaining challenges and future perspectives of LDH-based photocatalysts are summed up,aiming to inspire brand new solutions for pushing forward the development of LDH-based photocatalysis.Xuanang Bian Shuai Zhang Yunxuan Zhao Run Shi Tierui Zhang 2021InfoMat2021,3,7:5
5Laboratory Evaluation for Utilization of Phosphogypsum through Carbide Slag Highly-Effective Activating Anhydrous Phosphogypsum显示文摘Carbide slag was used as an activator to improve the activity of anhydrous phosphogypsum.Carbide slag could greatly improve the mechanical strength of anhydrous phosphogypsum than K_(2)SO_(4).The compressive strength of 11 wt%carbide slag and 1 wt%K_(2)SO_(4)activated anhydrous phosphogypsum increased greatly to 8.6 MPa at 3 d,and 11.9 MPa at 7 d,and 16.0 MPa at 28 d,respectively.The rate of hydration heat was accelerated and the total hydration heat was increased,and more calcium sulfate dihydrate was formed and cross-linked with other parts which improved the compressive strength of anhydrous phosphogypsum under the effects of different activators.It was indicated that carbide slag was a highly effective and cost-efficient activator.The result provides a highly effective and low-cost method which results in a novel and high value-added method for the utilization of phosphogypsum in the future.陈顺 XIONG Guoqing 苏英 HE Xingyang XIE Yunxuan WANG Yunfeng GONG Minhua 2021Journal of Wuhan University of Technology(Materials Science)2021,36,3:4
6Improved production of docosahexaenoic acid in batch fermentation by newly-isolated strains of Schizochytrium sp.and Thraustochytriidae sp.through bioprocess optimization显示文摘Thraustochytrids,rich in docosahexaenoic acid(DHA,C22:6u3),represent a potential source of dietary fatty acids.Yet,the effect of culture conditions on growth and fatty acid composition vary widely among different thraustochytrid strains.Two different thraustochytrid strains,Schizochytrium sp.PKU#Mn4 and Thraustochytriidae sp.PKU#Mn16 were studied for their growth and DHA production characteristics under various culture conditions.Although they exhibited similar fatty acid profiles,PKU#Mn4 seemed a good candidate for industrial DHA fermentation while PKU#Mn16 displayed growth tolerance to a wide range of process conditions.Relative DHA content of 48.5%and 49.2%(relative to total fatty acids),respectively,were achieved on glycerol under their optimal flask culture conditions.Maximum DHA yield(Yp/x)of 21.0%and 18.9%and productivity of 27.6 mg/L-h and 31.9 mg/L-h were obtained,respectively,in 5-L bioreactor fermentation operated with optimal conditions and dual oxygen control strategy.A 3.4-and 2.8-fold improvement of DHA production(g/L),respectively,was achieved in this study.Overall,our study provides the potential of two thraustochytrid strains and their culture conditions for efficient production of DHA-rich oil.Qiuzhen Wang Huike Ye Biswarup Sen Yunxuan Xie Yaodong He Sunghoon Park Guangyi Wang 2018Synthetic and Systems Biotechnology2018,3,2:4
7Degradation of poly(butylene adipate-co-terephthalate) by Stenotrophomonas sp. YCJ1 isolated from farmland soil显示文摘In recent years, poly(butylene adipate-co-terephthalate)(PBAT) has been widely used. However, PBAT-degrading bacteria have rarely been reported. PBAT-degrading bacteria were isolated from farmland soil and identified. The effects of growth factors on the degradation of PBAT and the lipase activity of PBAT-degrading bacteria were assessed. The degradation mechanism was analyzed using scanning electron microscopy, attenuated total reflection Fourier transform infrared spectroscopy, proton nuclear magnetic resonance, Xray diffraction, and liquid chromatography-mass spectrometry. The results showed that Stenotrophomonas sp. YCJ1 had a significant degrading effect on PBAT. Under certain conditions, the strain could secrete 10.53 U/m L of lipase activity and degrade 10.14 wt.% of PBAT films. The strain secreted lipase to catalyze the degradation of the ester bonds in PBAT, resulting in the production of degradation products such as terephthalic acid, 1,4-butanediol, and adipic acid. Furthermore, the degradation products could participate in the metabolism of YCJ1 as carbon sources to facilitate complete degradation of PBAT, indicating that the strain has potential value for the bioremediation of PBAT in the environment.Hao Jia Min Zhang Yunxuan Weng Yao Zhao Chengtao Li Aqsa Kanwal 2021Journal of Environmental Sciences2021,33,5:4
8F-box gene FOA2 regulates GA-and ABA-mediated seed germination in Arabidopsis显示文摘Dear Editor,GA and ABA antagonize each other in controlling seed germination,but the molecular mechanism is not fully understood.The F-box proteins act as the most important SCF(SKP1,cullin/CDC53,F-box protein)complex subunitReqing Hei Dashi Yu Xinmei Li Guifang Duan Yunxuan Zhang Dongying Tang Xiaoying Zhao Xuanming Liu 2016Science China(Life Sciences)2016,59,11:3
9Ultrafine monolayer Co-containing layered double hydroxide nanosheets for water oxidation显示文摘For many two-dimensional(2D)materials,low coordination edges and corner sites offer greatly enhanced catalytic performance compared to basal sites,motivating the search for new synthetic approaches towards ultrathin and ultrafine 2D nanomaterials with high specific surface areas.To date,the synthesis of catalysts that are both ultrathin(monolayer)and ultrafine(lateral size<10nm)has proven extremely challenging.Herein,using a facile ultrasonic exfoliation procedure,we describe the successful synthesis of ultrafine ZnCo-LDH nanosheets(denoted as ZnCo-UF)with a size^3.5 nm and thickness^0.5 nm.The single layer ZnCo-UF nanosheets possess an abundance of oxygen vacancies(Vo)and unsaturated coordination s让es,thereby affording outstanding electrocatalytic water oxidation performance.DFT calculations confirmed that Vo on the surface of ZnCo-UF enhanced H20 adsorption via increasing the electropositivity of the nanosheets.Xiaodan Jia Xin Zhang Jiaqing Zhao Yufei Zhao Yunxuan Zhao Geoffrey I.N.Waterhouse Run Shi Li-Zhu Wu Chen-Ho Tung Tierui Zhang 2019Journal of Energy Chemistry2019,28,7:3
10Effects of Maca Extract on Exercise Endurance and Ultrastructure of Mitochondria in Spinal Neurons显示文摘[Objectives] To study the effects of maca extract on the exercise endurance and ultrastructure of mitochondria in spinal neurons.[Methods]First,50 Wistar rats were randomly divided into 5 groups. The control group: no swimming,administered intragastrically the same volume of distilled water; simple swimming group: free swimming,administered intragastrically the same volume of distilled water; maca extract groups: free swimming,and treated with 4. 0,5. 3,and 8. 0 g/kg dose of maca extracts. Swimming rats swam freely in the circulating water flow of swimming pool and administered for 15 d. On the 16 th d,after the swimming endurance test,the rats were killed painlessly. The ultrastructure of the mitochondria in the spinal neurons was observed with a projection electron microscope,muscle glycogen,malondialdehyde( MDA),superoxide dismutase( SOD),glutathione peroxidase( GSH-Px) and free calcium in muscle were measured by radioimmunoassay.[Results] Compared with the simple swimming group,the swimming time before sinking and total swimming time extended 19. 83%,60. 28%,77. 55% and 55. 34%,73. 91% and 94. 47% respectively,and the differences were statistically significant( P < 0. 01). The sinking times decreased by 34. 35%,51. 18% and 57. 96% respectively,the differences were statistically significant( P < 0. 01). MDA and free calcium decreased by 20. 10%,31. 49% and 38. 72%,respectively with statistically significant differences( P < 0. 01) and 6. 42%,17. 58%and 26. 35% respectively. The levels of SOD,GSH-Px and muscle glycogen increased by 5. 12%,22. 74%,52. 53%,44. 22%,77. 79%and 98. 45% respectively,with statistically significant differences( P < 0. 01) and 35. 08%,47. 83% and 81. 88%,respectively,with statistically significant differences( P < 0. 01). The volume density( Vd),surface density( Sd) and number density( Nd) of mitochondria of spinal neurons decreased by 7. 79%,18. 18%,31. 17%,16. 95%,27. 34%,43. 31% and 13. 51%,23. 19% and 43. 15% respectively.[Conclusions]Maca extract can protect ultrastructure of the mitochondria in the spinal neurons,antioxidant activity,increase muscle glycogen,and improving the exercise capacity.Farong YU Wangjun CHEN Xiuzhen LIAN Mingren XIE Denglou LI Yunxuan GUO 2018Medicinal Plant2018,9,3:3
11A Review of Mineral Resources and GIS Applications in Mineral Resource Assessment in Northeast China显示文摘Northeast China is one of the regions in China that possesses a great abundance of mineral resources. Coal. petroleum, natural gas, gold, iron, magnesite, graphite, talc, molding sand, glass sand and some others account for large portion in reserves and yields of that in the whole country. The region faced also shortages of copper, molybdenum, oil shale, zirconium, tantalum, rare earth, and beryllium, although they have large reserves, but limited by economical and technical factors. Geological mapping and mineral exploration activities have been intensive. Only the north part of Daxinanling Mountains in the region leaves unexplored. GIS applications in mineral resource assessment in the region start not long. Databases for GIS applications are on the way of construction. Well - trained technical staff and expertise do not meet the demand. This article reviews the situation of mineral resources and GIS applications for mineral resource assessment in the region. Suggestions on multi - lateral cooperation and GIS training are also made.Zhou Yunxuan Wang Lei Liu Wansong Xu Huiping Sun Fengyue 2000Global Geology2000,5,2:3
12Recent progress in the structural study of ion channels as insecticide targets显示文摘Ion channels,many expressed in insect neural and muscular systems,have drawn huge attention as primary targets of insecticides.With the recent technical breakthroughs in structural biology,especially in cryo-electron microscopy(cryo-EM),many new high-resolution structures of ion channel targets,apo or in complex with insecticides,have been solved,shedding light on the molecular mechanism of action of the insecticides and resistance mutations.These structures also provide accurate templates for structure-based insecticide screening and rational design.This review summarizes the recent progress in the structural studies of 5 ion channel families:the ryanodine receptor(RyR),the nicotinic acetylcholine receptor(nAChR),the voltage-gated sodium channel(VGSC),the transient receptor potential(TRP)channel,and the ligand-gated chloride channel(LGCC).We address the selectivity of the channel-targeting insecticides by examining the conservation of key coordinating residues revealed by the structures.The possible resistance mechanisms are proposed based on the locations of the identified resistance mutations on the 3D structures of the target channels and their impacts on the binding of insecticides.Finally,we discuss how to develop“green”insecticides with a novel mode of action based on these high-resolution structures to overcome the resistance.Hadiatullah Hadiatullah Yongliang Zhang Arthur Samurkas Yunxuan Xie Rajamanikandan Sundarraj Han Zuilhof Jianjun Qiao Zhiguang Yuchi 2022Insect Science2022,29,6:2
13Improving Interfacial Adhesion of PLA/Lignin Composites by One-Step Solvent-Free Modification Method显示文摘To clarify the effects of lignin as a biodegradable filler added into the PLA matrix,PLA/lignin composites with or without silane coupling agent ofγ-(2,3-epoxypropoxy)propy trimethoxysilane(KH560)were prepared by a one-step solvent-free modification method.The effects of KH560 as a compatibilizer on the morphology,chemical structure,crystallization behavior,thermal degradative behavior as well as mechanical strength of the PLA/lignin composites were analyzed in detail.It was found that,after modification by KH560,the fractured surfaces of composites became smooth,suggested sufficient bonding between the lignin and PLA in the composites with KH560 coupling agent molecules.This result further proved by 1H NMR and ATR spectra of the composites that lignin and PLA formed stable chemical bonds with KH560.Due to the toughening effect of KH560,mainly affect the molecular chain mobility,the thermodynamic properties of LG-KH560/PLA composites were all reduced.When compared to the conventional solution modification method of adding silane coupling agents into PLA/lignin,the composites were synthesized via a single-step reactive extrusion modification procedure in this work showed relatively low tensile strength,which mainly because the existence of the free radicals due to coupling agents result in the composite’s deterioration and subsequent weakening of the tensile properties.Ningning Wang Caili Zhang Wenqin Zhu Yunxuan Weng 2020Journal of Renewable Materials2020,8,9:1
14Visible-Light-Sensitive SrCO3/AgI Hybrids for Tetracycline Degradation显示文摘The SrCO3/AgI photocatalysts were prepared via a co-precipitation method by using SrCO3 as a co-photocatalyst and AgI as a photo sensitizer.X-ray diffraction,field emission scanning electron microscope,X-ray photoelectron spectrometer,UV-vis diffuse reflectance spectroscopy and electrochemical impedance spectroscope were used to analyze the structure,micro-morphology,chemical compositions,optical properties and photo-generated carrier behaviors of the as-prepared samples,respectively.The photocatalytic degradation mechanism of the as-developed composites was also proposed.Analysis results show SrCO3,an insulator,can improve the photocatalytic performances and recyclability of AgI for degrading tetracycline under visible light.As the theoretical molar ratio of Sr(NO3)2 to AgNO3 increases,the degradation efficiency of the hybrids first increases and then descends.When the theoretical molar ratio of that is 1:1,it acquires the maximum of 66.6% within 8 min.This is higher than 32.0% of pure AgI and 34.0% of SrCO3.Moreover,after three times degradations it is 63.0%,which is higher than 13.6% of AgI.The improvement of the photocatalytic performance of the sample is attributed to the construction of hybrids.The main activated species in catalysis process are superoxide radicals.贾云宁 吴湘锋 LI Hui ZHANG Weiguang WANG Hui CHANG Tianlong FU Yunxuan LIU Xutao GUO Yudong SHANG Jialu 2020Journal of Wuhan University of Technology(Materials Science)2020,35,5:1
15Docosahexaenoic acid supplementation failed to attenuate chronic alcoholic fatty liver in mice显示文摘n-3 多元不堡和的角色包括在含酒精的脂肪肝(AFL ) 的 docosahexaenoic 酸(DHA ) 的丰满的酸(PUFA ) 在一系列研究被调查了。DHA 和 DHA 富有的鱼油被发现对尖锐 AFL 提供保护[1,2 ] ,当时他们长期的 AFL 上的效果仍然是一个争论问题。尽管歌等。[3 ] 发现 DHA 和 arachidonic 酸阻止了长期的 AFL,几另外的研究表明鱼油支持了长期的 AFL 的致病,当浸透时,丰满的酸对长期的 AFL 是保护的[4-6 ] 。n-3 PUFA 的剂量和质量可能是为这些冲突结果的可能的原因,这被推测[1,3 ] 。不管怎样,在长期的 AFL 的 DHA 的角色尚待被调查。Yi Wang Yuying Zhao Mingzhuo Li Yunxuan Wang Shuqing Yu Tao Zeng 2016Acta Biochimica et Biophysica Sinica2016,48,5:1
16Wind Power Prediction Based on Multi-class Autoregressive Moving Average Model with Logistic Function显示文摘The seasonality and randomness of wind present a significant challenge to the operation of modern power systems with high penetration of wind generation. An effective shortterm wind power prediction model is indispensable to address this challenge. In this paper, we propose a combined model, i.e.,a wind power prediction model based on multi-class autoregressive moving average(ARMA). It has a two-layer structure: the first layer classifies the wind power data into multiple classes with the logistic function based classification method;the second layer trains the prediction algorithm in each class. This two-layer structure helps effectively tackle the seasonality and randomness of wind power while at the same time maintaining high training efficiency with moderate model parameters. We interpret the training of the proposed model as a solvable optimization problem. We then adopt an iterative algorithm with a semi-closed-form solution to efficiently solve it. Data samples from open-source projects demonstrate the effectiveness of the proposed model. Through a series of comparisons with other state-of-the-art models, the experimental results confirm that the proposed model improves not only the prediction accuracy,but also the parameter estimation efficiency.Yunxuan Dong Shaodan Ma Hongcai Zhang Guanghua Yang 2022Journal of Modern Power Systems and Clean Energy2022,10,5:1
17A Study of DL Application in the Visualization of 3D Terrain显示文摘CHENG Guangqing ZHOU Yunxuan XU Huiping 2003Journal of Flirt University: Earth Science Edition2003,33,:1
18Bio- degradation Behavior of Poly(butylene adipate-cotereph- thalate((PBAT),Poly)lactic acid)(PLA),and Their Blend Under Soil Conditions显示文摘Weng Yunxuan Jin Yujuan Meng Qingyang 2013Polymer TevSting2013,32,:1
19The Develop- ment and Commercialization of Biobased显示文摘Yunxuan Weng Yingxin Zhou Zhangmin 2014Biodegradable Plastics in China Industrial Biotechnology2014,10,2:1
20Biodegra- dation Behavior of P(3 HB,4 HB)/PLA Blends in Real Soil Environments显示文摘Weng Yunxuan Wang Lei Zhang Min 2013Polymer Testing2013,32,:1
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