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Covalency triggers high catalytic activity of amorphous molybdenum oxides for oxidative desulfurization

中国科学：化学英文版 2023年第4期66卷 1211-1220页

作者： Juncong zou Yan lin Chunping Yang College of Environmental Science and Engineering Hunan University and Key Laboratory of Environmental Biology and Pollution Control(Hunan University)Ministry of EducationHunan UniversityChangsha 410082China Guangdong Provincial Key Laboratory of Petrochemcial Pollution Processes and Control and School of Environmental Science and EngineeringGuangdong University of Petrochemical TechnologyNaoming 525000China School of Environmental and Chemical Engineering Nanchang Hangkong UniversityNanchang 330063China

Oxidative desulfurization(ODS)is a promising technology to produce clean fuel with requiring superior catalysts to lower kinetic barriers.Although most ODS catalysts are based on crystalline transition-metal oxides(TMOs),extraordinary activity also can be achieved with amorphous TMOs.However,the origin of the remarkable catalytic activity of the amorphous TMOs remains greatly ambiguous.Here,we found the crucial role of Mo–O covalency in ruling the intrinsic catalytic activity of amorphous molybdenum oxides(MoO_(x)).Experimental and theoretical analysis indicated that the nonequivalent connectivity in the amorphous structure strongly enhanced Mo–O covalency,thereby increasing the content of electrophilic oxygen and nucleophilic molybdenum to favor the MoO_(x)–H_(2)O_(2) interaction.With the boosted Mo–O covalency to improve the flexibility of the charge state,the amorphous MoO_(x)-based composite catalyst(PE-MoO_(x)/S-0.05)exhibited outstanding catalytic activity for ODS of fuel oil.The turnover frequency(TOF)value of the catalyst(18.63 h^(-1))was almost an order of magnitude higher than that of most reported crystalline MoO_(x)/molecular sieve composite catalysts.The in-depth understanding of the origin of the amorphous TMOs activity for ODS provides a valuable reference for developing ODS catalysts.

关键词： amorphous molybdenum oxide oxidative desulfurization covalency

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Hydrogel-based optically and mechanically manipulable broadband microwave absorber

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Nano Research 2023年第7期16卷 10175-10182页

作者： Xiqiao Chen lin Du Guobao Jiang Zhuang Wu Yingchang zou Yanhong zou School of Electronic Information and Electrical Engineering Changsha UniversityChangsha 410022China School of Physics and Electronics Hunan UniversityChangsha 410082China

Microwave absorbers with unique optical and mechanical performance are urgent for complex electromagnetic environment.Here,we demonstrate the mechanically flexible,optically transparent,and microwave-absorbing polyacrylamide(PAM)hydrogel,in which the polar water molecules with high polarization contribute to the efficient microwave attenuation,but the binding between water molecules and PAM will slow down the orientation polarization of polar molecules.Meanwhile,the dominated dielectric property of water molecules in PAM hydrogel determines that the molecules displacement in polymer mixture is feasible for manipulating permittivity.Besides,by decreasing temperature,the flexible and transparent hydrogel will switch to rigid and opaque state as the phase conversion between amorphous and polycrystal state.By constructing structures with such hydrogel,the obtained absorber also exhibits the optical and mechanical switchable properties,covering the effective absorption within 5.7-18 GHz.This work provides an effective method to fabricate optically and mechanically manipulable microwave absorbers for intelligent electromagnetic stealth systems.

关键词： microwave absorption polyacrylamide hydrogel optical properties mechanical properties

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Application of microfluidic technologies on COVID-19 diagnosis and drug discovery

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药学学报:英文版 2023年第7期13卷 2877-2896页

作者： Zhun lin Zhengyu zou Zhe Pu Minhao Wu Yuanqing Zhang School of Pharmaceutical Sciences Sun Yat-sen UniversityGuangzhou 510006China Zhongshan School of Medicine Sun Yat-sen UniversityGuangzhou 510080China

The ongoing coronavirus disease 2019(COVID-19) pandemic has boosted the development of antiviral research.Microfluidic technologies offer powerful platforms for diagnosis and drug discovery for severe acute respiratory syndrome coronavirus 2(SARS-CoV-2) diagnosis and drug discovery.In this review,we introduce the structure of SARS-CoV-2 and the basic knowledge of microfluidic design.We discuss the application of microfluidic devices in SARS-CoV-2 diagnosis based on detecting viral nucleic acid,antibodies,and antigens.We highlight the contribution of lab-on-a-chip to manufacturing point-ofcare equipment of accurate,sensitive,low-cost,and user-friendly virus-detection devices.We then investigate the efforts in organ-on-a-chip and lipid nanoparticles(LNPs) synthesizing chips in antiviral drug screening and mRNA vaccine preparation.Microfluidic technologies contribute to the ongoing SARSCoV-2 research efforts and provide tools for future viral outbreaks.

关键词： Microfluidic COVID-19 SARS-CoV-2 Lab-on-a-chip Detection Organ-on-a-chip Drug screen

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Transcriptome-based identification and expression analysis of the glutathione S-transferase(GST)family in tree peony reveals a likely role in anthocyanin transport

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Horticultural Plant Journal 2022年第6期8卷 787-802页

作者： Lulu Han Hongzhu zou lin Zhou Yan Wang Research Institute of Forestry Key Laboratory of Tree Breeding and Cultivation of National Forestry and Grassland AdministrationChinese Academy of ForestryBeijing 100091China

For red-flowered cultivars of tree peony(Paeonia suffruticosa),anthocyanin content is a critical factor determining the different petal pigmentations.Glutathione S-transferases(GSTs)are ubiquitous and multifunctional conjugating proteins that may be responsible for the transport of anthocyanin pigments from the cytoplasm to vacuole.The underlying function of the GST family in tree peony,however,remains unclear.In this study,we systematically isolated and identified a total of 54 putative full-length Ps GST genes through a combination of bioinformatics approaches from transcriptome databases.Intraspecific phylogenetic analyses revealed extensive differentiation in their coding sequences and divided them into 10 of the 14 known classes of plant GSTs.The phylogenetic relationships,evolutionary characteristics,protein domain,and motif organization were clearly conserved among the different phylogenetic subclasses.The results of the RNA-seq and quantitative real-time polymerase chain reaction experiments exhibited extensive variation in gene expression profiles among different developmental stages and varieties.Furthermore,the phylogenetic relationships,expression profiles,protein interactions,weighted gene co-expression network analysis,and correlation analysis results suggested that PsGSTF3(Unigene 0064200)is a candidate participant in anthocyanin transport and the promotion of pigment accumulation,exhibiting a strong positive correlation with anthocyanin content among different tissues(r=0.908**)and an increasing rate of anthocyanin content during the flower developmental process(r=0.961*).These results furthered our understanding of the transport and accumulation functions of the GST family as well as the enhancement of tree peony breeding through molecular biology techniques.

关键词： GST Paeonia suffruticosa Functional prediction Expression analysis Anthocyanin transportation

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Interpretation of theη_(1)(1855)as a KK_(1)(1400)+c.c.molecule

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Science China(Physics,Mechanics & Astronomy) 2022年第6期65卷 60-66页

作者： Xiang-Kun Dong Yong-Hui lin Bing-Song zou CAS Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Helmholtz-Institut fur Strahlen-und Kernphysik and Bethe Center for Theoretical Physics Universitat BonnBonn D-53115Germany School of Physics Central South UniversityChangsha 410083China

An exotic state with J^(PC)=1^(−+),denoted byη1(1855),was observed by BESIII Collaboration recently in J/ψ→γηη′.The fact that its mass is just below the threshold of KK_(1)(1400)stimulates us to investigate whether this exotic state can be interpreted as a KK_(1)(1400)+c.***.molecule or not.Using the one boson exchange model,we show that it is possible for KK_(1)(1400)with J^(PC)=1^(−+)to bind together by taking the momentum cutoffΛ&2 GeV and yield the same binding energy as the experimental value whenΛ≈2.5 GeV.In this molecular picture,the predicted branch ratio Br(η1(1855)→ηη′)≈15%is consistent with the experimental results,which again supports the molecular explanation ofη1(1855).Relevant systems,namely KK_(1)(1400)with JPC=1−−and KK_(1)(1270)with J^(PC)=1^(−±),are also investigated,some of which can be searched for in the future experiments.

关键词： hadronic molecule exotic hadrons one boson exchange

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Dynamic soil arching in piled embankment under train load of high-speed railways

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Earthquake Engineering and Engineering Vibration 2023年第3期22卷 719-730页

作者： Niu Tingting Yang Yule Ma Qianli zou Jiuqun lin Bin School of Civil Engineering and Architecture Anhui University of Science and TechnologyHuainan 232001China College of Civil and Transportation Engineering Hohai UniversityNanjing 210098China

Piled embankments have many advantages that have been applied in high-speed railway construction engineering.However,the load transfer mechanism of piled embankments,such as soil arching and tension membranes,is still unclear,especially under dynamic loads.To investigate the soil arching and tension membrane under dynamic train loads on high-speed railways,a large-scale piled embankment model test with X-shaped piles as vertical reinforcement was performed,in which twenty-eight earth pressure cells were installed in the piled embankment and an M-shaped wave was adopted to simulate the high-speed railway train load.The results show that dynamic soil arching only occurs when two bogies of a carriage pass by and disappears at other times.The dynamic soil arching and membrane effect are the most significant under the concrete base.The arching height,stress concentration ratio and pile-soil load sharing ratio have a minimal value at 25 Hz.The dynamic soil arching degrades severely at 25 Hz,whose height at 25 Hz is only 0.35 times that at 5 Hz.The arching height fluctuates over a narrow range with increasing loading amplitude.The stress concentration ratio and the pile-soil load sharing ratio increase monotonically as the loading amplitude increases.

关键词： dynamic soil arching membrane effect piled embankment train load model test

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Numerical simulation of Marangoni effect induced by species transfer across iron droplet–molten slag interface

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Journal of Iron and Steel Research(International) 2023年第6期30卷 1109-1116页

作者： Ming-ming Li Zhen-qiang Wu lin Li Zong-shu zou Key Laboratory for Ecological Metallurgy of Multimetallic Mineral(Ministry of Education) Northeastern UniversityShenyang 110819LiaoningChina School of Metallurgy Northeastern UniversityShenyang 110819LiaoningChina School of Metallurgical Engineering Liaoning Institute of Science and TechnologyBenxi 117004LiaoningChina

A mathematical model accounting for unsteady mass transfer across interface of a stationary iron droplet immersed into molten slag was established through the volume of fluid coupled with level set method.The Marangoni effect induced by mass transfer was reproduced successfully,and the hydrodynamic instability phenomena at the interface,such as the Marangoni convection flow,the evolution of the interfacial tension during the mass transfer,and the influence of Marangoni effect on the mass transfer rate,were revealed.The results show that the Marangoni convection flow develops quickly and behaves as an ordered structure in the forms of four pairs of the convection cell at the edge of the droplet once the oxygen transfer across the interface starts.The average convection flow velocity along the interface is high,even more than 0.025 m/s,depending on the droplet diameter,which facilitates the mass transfer.The Marangoni convection flow of the large droplet develops more easily than that of the small droplet,and the larger the droplet diameter is,the higher the convection flow velocity and the mass transfer rate are.Moreover,it is shown that the droplet diameter influences the impacting region of the Marangoni convection flow and its duration period.

关键词： Interfacial mass transfer Interfacial tension Marangoni effect Droplet Numerical simulation

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Structural,volumetric and water retention behaviors of a compacted clay upon saline intrusion and freeze-thaw cycles

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Journal of Rock Mechanics and Geotechnical Engineering 2022年第3期14卷 953-966页

作者： Jianguo lin Weilie zou Zhong Han Ziwei Zhang Xiequn Wang School of Civil Engineering Wuhan UniversityWuhan430072China Key Laboratory of Hydraulic Rock Mechanics of Ministry of Education Wuhan UniversityWuhan430072China School of Civil Engineering and Architecture Wuhan University of TechnologyWuhan430070China

This study investigates the evolution of the structural,volumetric and water retention behaviors of a compacted clay during soaking and desiccation considering the influences of freeze-thaw(FT)cycles and saline intrusion.Compacted specimens were subjected to different FT cycles and then submerged in NaCl solution with different concentrations to facilitate the saline intrusion and measure the swelling behaviors.Shrinkage curve and filter paper tests were thereafter performed to reveal the clay’s volumetric and water-retention characteristics during desiccation.Mercury intrusion porosimetry and field emission scanning electron microscopy tests were conducted to observe the evolution of the clay’s microstructure.Experimental results show that the clay’s micropores decrease and macropores increase after FT cycles,which is associated with the migration of water,growth of ice crystals,and development of FT-induced cracks during FT cycles.Similar observations were obtained from specimens after the saline intrusion,which is attributed to the osmotic and osmotically-induced consolidation.FT-induced cracks significantly reduce the clay’s swelling and shrinkage potentials.FT cycles result in the shrinkage of micropores which leads to a reduction in the water retention capacity in the low suction range(capillary regime).The salinization suppresses the swelling of the clay and prolongs its primary and secondary swelling stages.The shrinkage potential initially increases and then decreases with increasing saline concentration.Salinization has significant influences on the osmotic suction and thus alters the clay’s water-retention curves in terms of total suction.It demonstrates little impact on the clay’s water-retention curves in terms of matric suction.

关键词： Compacted clay Microstructure Volumetric behavior Water-retention capacity Salinization Freeze-thaw(FT)cycles

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Super enhancers:Pathogenic roles and potential therapeutic targets for acute myeloid leukemia(AML)

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Genes & Diseases 2022年第6期9卷 1466-1477页

作者： Ziyang Cao Yi Shu Jinxia Wang Chunxia Wang Tienan Feng Li Yang Jingbo Shao Lin Zou Clinical Research Unit Shanghai Children’s HospitalShanghai Jiao Tong UniversityShanghai 200062PR China Institute of Pediatric Infection ImmunityCritical Care MedicineShanghai Jiao Tong University School of MedicineShanghai 200062PR China Center for Clinical Molecular Laboratory Medicine of Children’s Hospital of Chongqing Medical University Chongqing 400014PR China Clinical Research Institute Shanghai Jiao Tong University School of MedicineShanghai 200025PR China Department of Hematology The First Affiliated Hospital of Chongqing Medical UniversityChongqing 400016PR China Department of Hematology/Oncology Shanghai Children’s HospitalShanghai Jiao Tong UniversityShanghai 200062PR China

Acute myeloid leukemia(AML)is a malignant hematological tumor with disordered oncogenes/tumor suppressor genes and limited treatments.The potent anti-cancer effects of bromodomain and extra-terminal domain(BET)inhibitors,targeting the key component of super enhancers,in early clinical trials on AML patients,implies the critical role of super enhancers in AML.Here,we review the concept and characteristic of super enhancer,and then summarize the current researches about super enhancers in AML pathogenesis,diagnosis and classification,followed by illustrate the potential super enhancer-related targets and drugs,and propose the future directions of super enhancers in AML.This information provides integrated insight into the roles of super enhancers in this disease.

关键词： Classification Leukemogenesis Super enhancer Therapy targets

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Promoting hydrogen industry with high-capacity Mg-based solid-state hydrogen storage materials and systems

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Frontiers in Energy 2023年第3期17卷 320-323页

作者： Li REN Yinghui LI Xi lin Wenjiang DING Jianxin zou 不详

Launch of the world's leading tonnage Mg-based solid-state hydrogen storage and transportation trailer Large-scale,safe,and efficient hydrogen storage has long been considered as the bottleneck to the worldwide application of hydrogen energy in human society and industries[1-6].Recently,a tonnage Mg-based solid-state hydrogen storage and transportation trailer(named as MH-100T)(Fig.1)developed jointly by Shanghai Jiao Tong University and Shanghai Hyfun Energy Technology Co.,Ltd.,was officially unveiled both in Shanghai and World Hydrogen Technology Convention(WHTC,May 22nd-26th,2023)held in Foshan,marking a new breakthrough in the field of hydrogen storage and transportation.Profs.Jianxin zou,Wenjiang Ding,and their team provide key technical support for the development of this solid-state hydrogen storage and transportation trailer.

关键词： hydrogen solid trail

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