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Fundamentals and application in phytoremediation of an efficient arsenate reducing bacterium Pseudomonas putida ARs1

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Journal of environmental sciences 2024年第3期137卷 237-244页

作者： ze-Wen Wang Guang Yang Jian Chen Yaoyu Zhou Avelino Nunez Delgado hui-Ling Cui Gui-Lan Duan Barry P.Rosen Yong-Guan Zhu henan Institute of Advanced Technology Zhengzhou UniversityZhengzhou 450052China state Key Lab of Urban and Regional ecology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Department of Cellular Biology and Pharmacology Florida International UniversityHerbert Wertheim College of MedicineMiamiFL33199USA University of Chinese Academy of sciences Beijing 100049China Key Laboratory of Urban environment and health Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China College of Resources and environment Hunan Agricultural UniversityChangsha 410128China Department of soil science and Agricultura Chemistry Engineering Polytechnic SchoolUniversity of Santiago de CompostelaCampus Univ.s/n27002LugoSpain

Arsenic is a ubiquitous environmental ***-mediated arsenic biotransformations significantly infuence arsenic mobility and *** transformations by soil and aquatic organisms have been well documented,while little is known regarding effects due to endophytic *** endophyte Pseudomonas putida ARs1 was isolated from rice grown in arsenic contaminated *** ARs1 shows high tolerance to arsenite(As(Ⅲ))and arsenate(As(V)),and exhibits efficient As(V)reduction and As(Ⅲ)effux *** exposed to 0.6 mg/L As(V),As(V)in the medium was completely converted to As(Ⅲ)by *** ARs1 within 4 *** sequencing showed that *** ARs1 has two chromosomal arsenic resistance gene clusters(arsRCBh)that contribute to efficient As(V)reduction and As(Ⅲ)effux,and result in high resistance to *** globosa is a strong arsenic accumulator with high potential for arsenic phytoremediation,which takes up As(Ⅲ)more efficiently than As(V).Co-culture of *** ARs1 and *** enhanced arsenic accumulation in *** by 69%,and resulted in 91%removal of arsenic(at initial concentration of 0.6 mg/L As(V))from water within 3 *** study provides a promising strategy for in situ arsenic phytoremediation through the cooperation of plant and endophytic bacterium.

关键词： Arsenic Pseudomonas putida Arsenate reduction endophyte Wolffia globosa Phytoremediation

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Improvement for creep strength of a second-generation single crystal superalloy by design of heat treatments

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Rare Metals 2024年第1期43卷 342-350页

作者： Wan-shun Xia Xin-Bao Zhao Jia-Chen Xu Quan-Zhao Yue Qing-Qing Ding huan-Chang Duan Yue-Feng Gu hong-Bin Bei ze Zhang Institute of superalloys science and Technology School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China state Key Laboratory of silicon and Advanced Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China

Design of heat treatments is related to the key technology for development of nickel-based single crystal superalloys(Ni-sXs). Based on the full understanding of the solidification characteristics, this work applies optimization design of heat treatments for a second-generation Ni-sX. Microstructure evolution and creep properties are compared in the material under conventional/standard(std.) and optimized(Opt.) treatments. For the std. sample,strong dendritic segregations determine inconsistent microstructure evolution in the dendritic(D) and interdendritic region(ID), while the latter serves as weak area to have the prior microcrack initiation, damaging overall performance of the alloy. The Opt. treatment applies higher homogenization temperature, leading to overall reduced segregations, while not inducing incipient melting. A lower temperature of first-step ageing is used to lower the size ofγ'particles. These help to form the more uniform microstructure in dendritic and interdendritic region and relieve the inconsistent microstructure evolution. The balanced local strength makes ID no longer as the weak area,thus restricting microcrack initiation. Great improvement of high temperature and low stress property is obtained by this progress, leading to the pronounced increase of creep rupture life under 1100 °C/140 MPa.

关键词： single crystal superalloy heat treatment segregation solidification Creep property

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Biomechanical analysis of an absorbable material for treating fractures of the inferior orbital wall

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International Journal of Ophthalmology(english edition) 2024年第7期17卷 1331-1336页

作者： Jin-hai Yu ze-Xi sang huang Zhang Qi-hua Xu Qin huang hong-Fei Liao Yao-hua Wang school of Optometry Jiangxi Medical CollegeNanchang UniversityNanchang 330006Jiangxi ProvinceChina Jiangxi Research Institute of Ophthalmology and Visual science Nanchang 330006Jiangxi ProvinceChina Jiangxi Provincial Key Laboratory for Ophthalmology Nanchang 330006Jiangxi ProvinceChina National Clinical Research Center for Ocular Diseases Jiangxi Province Division Nanchang 330006Jiangxi ProvinceChina The Affiliated eye hospital Jiangxi Medical CollegeNanchang 330006Jiangxi ProvinceChina Jiangxi Clinical Research Center for Ophthalmic Disease Nanchang 330006Jiangxi ProvinceChina

AIM:To investigate the biomechanical properties and practical application of absorbable materials in orbital fracture ***:The three-dimensional(3D)model of orbital blowout fractures was reconstructed using Mimics21.0 *** repair guide plate model for inferior orbital wall fracture was designed using 3-matic13.0 and Geomagic wrap 21.0 *** finite element model of orbital blowout fracture and absorbable repair plate was established using 3-matic13.0 and ANsYs Workbench 21.0 *** mechanical response of absorbable plates,with thicknesses of 0.6 and 1.2 mm,was modeled after their placement in the *** patients with inferior orbital wall fractures volunteered to receive single-layer and double-layer absorbable plates combined with 3D printing technology to facilitate surgical treatment of orbital wall ***:The finite element models of orbital blowout fracture and absorbable plate were successfully *** element analysis(FeA)showed that when the Young’s modulus of the absorbable plate decreases to 3.15 MPa,the repair material with a thickness of 0.6 mm was influenced by the gravitational forces of the orbital contents,resulting in a maximum total deformation of approximately 3.3 ***,when the absorbable plate was 1.2 mm thick,the overall maximum total deformation was around 0.4 *** half-year follow-up results of the clinical cases confirmed that the absorbable plate with a thickness of 1.2 mm had smaller maximum total deformation and better clinical ***:The biomechanical analysis observations in this study are largely consistent with the clinical *** use of double-layer absorbable plates in conjunction with 3D printing technology is recommended to support surgical treatment of infraorbital wall blowout fractures.

关键词： orbital blowout fracture absorbable material finite element analysis 3D printing technology

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Theoretical exploration of Alloying effects on stabilities and Mechanical Properties ofγʹPhase in Novel Co–Al–Nb-Base superalloys

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Acta Metallurgica sinica(english Letters) 2024年第7期37卷 1238-1248页

作者： Guan-Cheng Gu Zhao-Jing han ze-Yu Chen Zhao-Xuan Li sheng-Bao Xia Zheng-Ning Li hua Jin Wei-Wei Xu Xing-Jun Liu shenzhen Research Institute of Xiamen University School of Aerospace EngineeringXiamen UniversityXiamen361005China Institute of Materials Genome and Big Data Harbin Institute of TechnologyShenzhen518055China

The new developedγ/γʹCo–Al–Nb-base alloys show great potentials as high-temperature ***,finding appropriate compositions to improve performance of alloys still poses a great challenge to the development of Co–Al–Nb-base *** by the lack of alloying effects on fundamental properties of criticalγʹphase,we systematically performed a theoretical investigation on the effect of alloying elements TM(TM:Ti,V,Cr,Zr,Mo,Ta,W,Re,and Ru)on phase stabilities and mechanical properties of L1_(2)-typeγʹ(Co,Ni)_(3)(Al,Nb).By analyzing the stability ofγʹphase with respect to its competitive B2 and D0_(19) phases,the results shown that Ti,V,and Cr enhance the L1_(2) stability and widen the L1_(2)–D0_(19) energy barrier,in which V yields the maximum *** analysis of electronic structure indicated that the alternation of valence electrons at fermi level would be the atomic origin for doping TM inγʹ*** calculated results of mechanical properties shown that V and Cr are expected to be optimal dopant for enhancing the strength and the ductility ofγʹ*** addition of Ta is also beneficial for enhancing the strength at the slight expense of ductility ofγʹ*** drawing the mechanical maps,the preferred composition range for the phases with desired properties is roughly demarcated in theory for the multi-addition of V/Cr and V/Ta inγʹ*** findings would be useful for optimizing the performance of novelγ/γʹCo–Al–Nb-base superalloys.

关键词： Co-Al-Nb-base superalloys γ/γʹdual-phase Phase stability Mechanical properties First-principle methods

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Predicting potential invasion risks of Leucaena leucocephala(Lam.)de Wit in the arid area of saudi Arabia

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Journal of Arid Land 2024年第7期16卷 983-999页

作者： haq s MARIFATUL Darwish MOhAMMeD Waheed MUhAMMAD Kumar MANOJ siddiqui h MANzeR Bussmann W RAINeR Department of ethnobotany Institute of BotanyIlia State UniversityTbilisi 0162Georgia The Centre of excellence on sustainable Land Management(Coe-sLM) Indian Council of Forestry Research and EducationDehradun 248006India Department of Botany and Microbiology College of ScienceKing Saud UniversityRiyadh 11451Saudi Arabia Department of Botany State Museum for Natural HistoryKarlsruhe 76133Germany

The presence of invasive plant species poses a substantial ecological impact,thus comprehensive evaluation of their potential range and risk under the influence of climate change is *** study uses maximum entropy(Maxent)modeling to forecast the likelihood of Leucaena leucocephala(Lam.)de Wit invasion in saudi Arabia under present and future climate change *** the Maxent modeling,we integrated climatic and soil data to predict habitat suitability for the invasive *** conducted a detailed analysis of the distribution patterns of the species,using climate variables and ecological *** focused on the important influence of temperature seasonality,temperature annual range,and precipitation *** distribution modeling used robust measures of area under the curve(AUC)and receiver-operator characteristic(ROC)curves,to map the invasion extent,which has a high level of accuracy in identifying appropriate *** complex interaction that influenced the invasion of *** was highlighted by the environmental parameters using Jackknife ***,the actual geographic area where *** was found in saudi Arabia was considerably smaller than the theoretical maximum range,suggesting that it had the capacity to expand *** Maxent model exhibited excellent prediction accuracy and produced reliable results based on the data from the ROC *** and temperature were the primary factors influencing the potential distribution of ***,an estimated area of 216,342 km^(2)in saudi Arabia was at a high probability of invasion by *** investigated the potential for increased invasion hazards in the future due to climate change scenarios(shared socioeconomic Pathways(ssPs)245 and 585).The analysis of key climatic variables,including temperature seasonality and annual range,along with soil properties such as clay composition and nitrogen content,unveiled their substanti

关键词： area under the curve invasive species invasion risks climate change Maxent model

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endoscopic treatment of biliopancreatic pathology in patients with Whipple's pancreaticoduodenectomy surgical variants: Lessons learned from single-balloon enteroscopy-assisted eRCP

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hepatobiliary & Pancreatic Diseases International 2024年第5期23卷 509-514页

作者： Rodrigo Garcés-Durán Laurent Monino Pierre h Deprez hubert Piessevaux Tom G Moreels Department of Gastroenterology and hepatology Universitécatholique de LouvainCliniques Universitaires Saint-LucAvenue Hippocrates 101200 BrusselsBelgium

Background: endoscopic treatment of biliopancreatic pathology is challenging due to surgically altered anatomy after Whipple's pancreaticoduodenectomy. This study aimed to evaluate the feasibility and safety of single-balloon enteroscopy-assisted endoscopic retrograde cholangiopancreatography(sBe-eRCP) to treat biliopancreatic pathology in patients with Whipple's pancreaticoduodenectomy surgical variants. Methods: We retrospectively analyzed 106 sBe-eRCP procedures in 46 patients with Whipple's variants. Technical and clinical success rates and adverse events were evaluated. Results: Biliary sBe-eRCP was performed in 34 patients and pancreatic sBe-eRCP in 17, including 5 with both indications. From a total of 106 sBe-eRCP procedures, 76 were biliary indication with technical success rate of 68/76(90%) procedures and clinical success rate of 30/34(88%) patients. Mild adverse event rate was 8/76(11%), without serious adverse events. From a total of 106 sBe-eRCP procedures, 30 were pancreatic indication with technical success rate of 24/30(80%) procedures( P = 0.194 vs. biliary sBeeRCP) and clinical success rate of 11/17(65%) patients( P = 0.016 vs. biliary sBe-eRCP). Mild adverse event rate was 6/30(20%)( P = 0.194 vs. biliary sBe-eRCP), without serious adverse events. After sBe-eRCP failure, endoscopic ultrasound-guided drainage, percutaneous drainage and redo surgery were alternative therapeutic options. Conclusions: Biliopancreatic pathology after Whipple's pancreaticoduodenectomy variants can be treated using sBe-eRCP without serious adverse events. Technical and clinical success rates are high for biliary indications, whereas clinical success rate of pancreatic indications is significantly lower. sBe-eRCP can be considered as first-line treatment option in this patient group with surgically altered anatomy.

关键词： enteroscopy endoscopic retrograde cholangiopancreatography Pancreaticoduodenectomy surgically altered anatomy Whipple’s procedure

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Atomistic Investigation of shock-Induced Amorphization within Micro-shear Bands in hexagonal Close-Packed Titanium

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Acta Metallurgica sinica(english Letters) 2024年第9期37卷 1590-1600页

作者： Z.C.Meng K.G.Wang T.Ali D.Li C.G.Bai D.s.Xu s.J.Li A.h.Feng G.J.Cao J.h.Yao Q.B.Fan h.Wang R.Yang Institute of Metal Research Chinese Academy of SciencesShenyang 110016China school of Materials science and engineering University of Science and Technology of ChinaShenyang 110016China Interdisciplinary Centre for Additive Manufacturing(ICAM) School of Materials and ChemistryUniversity of Shanghai for Science and TechnologyShanghai 200093China school of Materials science and engineering Tongji UniversityShanghai 201804China Key Laboratory for Light-Weight Materials Nanjing Tech UniversityNanjing 210009China National Key Laboratory of science and Technology on Materials Under shock and Impact School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Beijing Institute of Technology Chongqing Innovation Center Chongqing 401135China

The mechanical response of a single crystal titanium sample against(0001)α surface impact was investigated using molecular dynamics ***,non-uniform plastic deformation was observed in the *** high strain rates,amorphization occurred near the edge of the contact region where severe shear strain induced a large number of stacking faults(sFs)and *** contrast,the central part of the contact region underwent less deformation with significantly fewer ***,instead of amorphization by consuming sFs and dislocations,there was a gradual increase in the density of dislocations and sFs during the process of *** local amorphous regions eventually grew into shear bands.

关键词： shock compression Amorphization shear band Titanium Molecular dynamics

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syntheses and properties of associative acrylamide copolymers containing short hydrophobic chains used in a friction reducer for slick-water fracturing

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Petroleum science 2024年第3期21卷 1889-1901页

作者： Ya-Xing Dai Xian-Li Zhang si-Yuan Liu Feng-Run-ze Zhang Yi-Xi Zhang Yu-Tong sang Jing-Xi Zheng Zhao-sheng Liu Peng Zhang College of Chemistry and Chemical engineering Chongqing University of Science and TechnologyChongqing401331China College of ecology and environment Chongqing Resources and Environmental Protection of UniversityChongqing401331China China China Property Project Department of Dezhou Mining Property Service CenterShengli Oilfield Company of SinopecDezhou253000ShandongChina

Two allyldimethylalkyl quaternary ammonium salt(AQAs)monomers,N,N-dimethylallylphenylpropylammonium bromide(AQAs1)and N,N-dimethylallylnonylammonium bromide(AQAs2),were synthesized and used to prepare modified polyacrylamide *** new drag reducers were synthesized from acrylamide(AM),sodium acrylate(Na AA)and a cationic modified monomer(AQAs1 or AQAs2)via aqueous solution polymerization,and the copolymers were named P(AM/Na AA/AQAs1)and P(AM/Na AA/AQAs2),*** structures of the drag reduction agents were confirmed by IR and1h NMR *** molecular weight(Mw)of P(AM/Na AA/AQAs1)was 1.79×10^(6)g/*** the copolymer concentration was 1000 mg/L and the flow rate was 45 L/min,in fresh water the highest drag reduction rate was 75.8%,in 10,000 mg/L Na Cl solution the drag reduction rate decreased to 72.9%.The molecular weight of P(AM/Na AA/AQAs2)was 3.17×10^(6)g/*** the copolymer concentration was500 mg/L and the flow rate was 45 L/min,the drag reduction rate reached 75.2%,and in 10,000 mg/L Na Cl solution the drag reduction rate was 73.3%,decreased by approximately 1.9%.The drag reduction rate for partially hydrolyzed polyacrylamide(hPAM)was also investigated,and the results showed that the drag reduction rates for 500 and 1000 mg/L hPAM solutions were merely 43.2%and 49.0%in brine,*** with hPAM,both of the above copolymers presented better drag reduction capacities.

关键词： shale gas slick water Drag reducer Modified monomer Copolymerization

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The Optical Variability Properties of TeV Blazars

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Research in Astronomy and Astrophysics 2024年第9期24卷 66-75页

作者： Zi-An su Wen-Xin Yang Xiang-Tao zeng Le-Jian Ou ze-Lin Li Jiang-he Yang Jun-hui Fan Department of Physics School of Physics and ElectronicsHunan Normal UniversityChangsha 410081China Center for Astrophysics Guangzhou UniversityGuangzhou 510006China Greater Bay Brand Center of the National Astronomical Data Center Guangzhou 510006China Astronomy science and Technology Research Laboratory of Department of education of Guangdong Province Guangzhou 510006China College of Microelectronics Feicuihu Campus of Hefei University of TechnologyHefei 230601China College of Mathematics and Physics science Hunan University of Arts and ScienceChangde 415000China

Variability is one of the typical observational properties of blazars and the spectral changes are usually associated with variability,although this kind of association is unclear *** this work,we used data from the steward Observatory blazar monitoring program to investigate the optical variability properties including the short-term timescale,the brightness-dependent spectral property,the correlation between the the brightness variation and the polarization,and then estimate the Doppler factors based on the obtained short timescale to study the polarization property for a sample of 20 TeV *** analyses arrive at the following results:(1)The largest variation amplitude in R-band,ΔR_(M),covers a range from ΔR_(M)=0.29 mag(1es 2344+514)to ΔR_(M)=4.66 mag(3C 279).(2)Intra-day variability was found from five sources with timescales from 0.14 day for s50716+714 to 0.98 day for PKs *** sources show spectra that are bluer when they become brighter,suggesting a common bluer-when-brighter property.(3)The plot of the polarization versus estimated Doppler factor is consistent with the Doppler factor dependent formula of polarization.(4)The largest polarization is correlated with the largest optical variation,suggesting that the high polarization and high amplitude variation are both the indicator of beaming effect.

关键词： galaxies:active galaxies:jets radiation mechanisms:non-thermal

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One-step controlled electrodeposition nickel sulfides heterointerfaces favoring the desorption of hydroxyl groups for efficient hydrogen generation

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Rare Metals 2024年第9期43卷 4377-4386页

作者： Ru-Chun Li Xin-Yue Zhang ze-Yue Qu Feng-Yi Liu Quan-Qing Xu Zhao-Xia hu Jing-Wei Li Mohamed-Nawfal Ghazzal Jin-Li Yu Faculty of Chemistry and Chemical engineering Yunnan Normal UniversityKunming 650500China Foshan Gaoke hechuang Technology Co. Ltd.Foshan 528200China school of Chemistry and Chemical engineering Guangzhou UniversityGuangzhou 510006China Universite Paris-saclay UMR 8000 CNRSInstitut de Chimie PhysiqueOrsay 91405France Department of Chemistry City University of Hong KongHong Kong 999077China

The heterointerface engineering involving different components or phases represents a desirable strategy for enhancing the sluggish kinetics of hydrogen evolution reaction(heR).however,constructing desired heterointerfaces and elucidating the reaction mechanisms on the interface remains a considerable *** this work,we propose a straightforward electrochemical synthesis strategy to prepare the nickel sulfide-based heterointerfaces for *** mechanism of electrochemical synthesis is revealed,wherein metal-thiourea species can be formed at the cathode potential and subsequently oxidized to nickel sulfides at the anode *** this mechanism,a range of nickel sulfides,including Nis,Ni_(3)s_(2)/Nis,Ni/Ni_(3)s_(2)and Ni_(3)s_(2),have been successfully synthesized by tuning the potential range of cyclic *** these,the obtained Ni_(3)s_(2)/Nis@CC(CC:carbon cloth)exhibits the smallest overpotential of84 mV at 10 mA·cm^(-2)and high *** calculations further reveal that the combination of Nis and Ni_(3)s_(2)induces electron redistribution at the interface,and thus the Volmer process is effectively promoted with faster water dissociation and Oh desorption ***,the simplicity method coupled with a clear synthesis mechanism and outstanding heR performance highlights its promising potential for practical applications.

关键词： hydrogen evolution reaction heterointerfaces Oh desorption kinetics electrochemical synthesis

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