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Controlling of coordination state of Ru_(x)N_(y) clusters for efficient oxygen reduction electrocatalysis

Nano Research 2024年第3期17卷 1035-1041页

作者： Weiyang Fu Yihuan Yu tongtong liu Yinliang Cao Zhengping Zhang Feng Wang State Key Laboratory of Chemical Resource Engineering Beijing Key Laboratory of Electrochemical Process and Technology for MaterialsBeijing University of Chemical TechnologyBeijing 100029China Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical TechnologyBeijing 100029China Zhejiang Tianneng Hydrogen Energy Technology Co. Ltd.Huzhou 313100China

Ruthenium(Ru)is an attractive potential alternative to platinum as an electrocatalyst for the oxygen reduction reaction(ORR),in virtue of its high catalytic selectivity and relatively low price.In this work,a series of well-dispersed nitrogen-coordinated Ru-clusters on carbon black(Ru_(x)N_(y)/C)were prepared by pyrolyzing different Ru-containing sandwich compounds as the Ru sources.The higher thermal stability of these complexed sandwich precursors(bis(1,2,3,4,5-pentamethylcyclopentadienyl)Ru(II)monomer,dichloro(p-cymene)Ru(II)dimer,and chloro(1,2,3,4,5-pentamethylcyclopentadienyl)Ru(II)tetramer)affords the control of coordinated state for the resulting Ru-clusters,in comparison of that derived from ruthenium chlorides.After the pyrolysis treatment,the Ru coordinated state in Ru_(x)N_(y)/C,with the Ru–N and Ru–Ru bonds,still showed the structural inheritance from the Ru(II)monomer,dimer,and tetramer,but using ruthenium chlorides as the Ru source resulted in the nanoscale Ru agglomerations.The ORR testing exhibited that the Ru_(x)N_(y)/C sample derived from the Ru(II)tetramer(Ru_(x)N_(y)/C-T)presents the higher catalytic activity than the other obtained samples in either alkaline or acidic electrolytes.Even in the acidic electrolyte,Ru_(x)N_(y)/C-T shows the comparable ORR activity to that of Pt/C catalysts,and it shows the superior tolerance against methanol and CO.The X-ray absorption spectroscopy and density functional theory calculations demonstrate that these tetra-nuclear Ru-clusters could be the most active site due to their broadened d-orbital bands and lower energy d-band center than those of other subnano species and nanocrystals,and their favorable Yeager-type adsorption of O_(2)-molecules is also contributed to promoting O–O bond cleavage and accelerating the ORR process.

关键词： ruthenium clusters coordination environment sandwich compounds electrocatalysis oxygen reduction reaction

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The coordinated evolution of ecological environment,public service,and tourism economy along the Silk Road Economic Belt,using the Dual-Carbon Targets

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Chinese Journal of Population,Resources and Environment 2024年第1期22卷 34-47页

作者： Shuo Yang Wei Guo Tianjun Xu tongtong liu School of Economic and Management Yanshan UniversityQinhuangdao 066004China Regional Economic Development Center Yanshan UniversityQinhuangdao 066004China

Carbon peak and carbon neutrality(dual-carbon)are important targets for the international response to climate change.The Silk Road Economic Belt is a strategic resource region and is important for future ecological environment and tourism development.Based on the“dual-carbon”targets,the Single index quantification,Multiple index synthesis,and Poly-criteria integration evaluation model were used in this study to measure the coordinated development index of the ecological environment,public service,and tourism economy along the Silk Road Economic Belt and to analyze its spatial and temporal evolution.Further,it explores the dynamic evolution and development trend of the three systems using the Kernel Density and Grey Markov Prediction Model.The results show that the coordinated development index along this region needs to be improved during the study period.Furthermore,the coordinated development index of the Southwest region is relatively higher than that of the Northwest region.From the development trend of the three systems,all of them develop in a stable manner;however,the tourism economy system is easily affected by external disturbances.The coordinated development index of the three systems changes dynamically and tends to be in a good state of coordination.There is a certain spatial and temporal heterogeneity.The gravity center of the coordinated development index has been in the Southwest region.During the forecast period,the coordinated development index along this region will improve significantly,while insufficient and unbalanced development will continue.

关键词： Dual-carbon Ecological environment Public services Tourist economy Silk Road Economic Belt

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Tuning the exciton binding energy of covalent organic frameworks for efficient photocatalysis

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Chinese Chemical Letters 2024年第2期35卷 577-583页

作者： Zhangjie Gu Zhen Shan Yulan Wang Jinjian Wang tongtong liu Xiaoming Li Zhiyang Yu Jian Su Gen Zhang Key Laboratory for Soft Chemistry and Functional Materials of Ministry of Education School of Chemistry and Chemical EngineeringNanjing University of Science and TechnologyNanjing 210094China State Key Laboratory of Photocatalysis on Energy and Environment College of ChemistryFuzhou UniversityFuzhou 350002China MIIT Key Laboratory of Advanced Display Material and Devices School of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing 210094China Key Laboratory of Preclinical Study for New Drugs of Gansu Province School of Basic Medical SciencesLanzhou UniversityLanzhou 730000China

Owing to the large exciton binding energy(>100 meV)of most organic materials,the process of exciton dissociation into free electrons and holes is seriously hindered,which plays a key role in the photocatalytic system.In this study,a series of chalcogen(S,Se)-substituted mesoporous covalent organic frameworks(COFs)have been synthesized for enhanced photocatalytic organic transformations.Photoelectrochemical measurements indicate that the introduction of semi-metallic Se atom and the enlargement of conjugation degree can not only reduce the exciton binding energy accelerating the charge separation,but also reduce the band gap of COFs.As a result,the COF-NUST-36 with the lowest exciton binding energy(39.5 meV)shows the highest photocatalytic performance for selective oxidation of amines(up to 98%Conv.and 97.5%Sel.).This work provides a feasible method for designing COFs with high photocatalytic activity by adjusting exciton binding energy.

关键词： Covalent organic frameworks Exciton binding energy Atom substitution Extended conjugation Photocatalysis

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Immunoglobulin superfamily containing leucine-rich repeat(ISLR)negatively regulates osteogenic differentiation through the BMP-Smad signaling pathway

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Genes & Diseases 2024年第4期11卷 138-140页

作者： Lei Xiong Miaomiao Lan Chang liu Lei Li YingYing Yu tongtong Wang Fan liu Kun Wang Jin liu Qingyong Meng State Key Laboratory of Agrobiotechnology College of Biological SciencesChina Agricultural UniversityBeijing 100094China

Osteoporosis(OP)is an aging-associated condition that significantly affects the quality of life in aging humans and has few treatment options.As an important marker,recombinant immunoglobulin superfamily containing leucinerich repeat(ISLR)could be used as a gene therapy for OP.We herein used alkaline phosphatase(ALP)and alizarin red S(ARS)staining to evaluate osteogenic differentiation potential.

关键词： Immunoglobulin alkaline herein

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Ca and Sr co-doping induced oxygen vacancies in 3DOM La_(2-x)Sr_(x)Ce_(2-y)CayO_(7-δ)catalysts for boosting low-temperature oxidative coupling of methane

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Journal of Energy Chemistry 2024年第4期91卷 331-344页

作者： tongtong Wu Yuechang Wei Jing Xiong Yitao Yang Zhenpeng Wang Dawei Han Zhen Zhao Jian liu State Key Laboratory of Heavy Oil Processing China University of PetroleumBeijing 102249China Key Laboratory of Optical Detection Technology for Oil and Gas China University of PetroleumBeijing 102249China

It is urgent to develop catalysts with application potential for oxidative coupling of methane(OCM)at relatively lower temperature.Herein,three-dimensional ordered macro porous(3 DOM)La_(2-x)Sr_(x)Ce_(2-y)CayO_(7-δ)(A_(2)B_(2)O_(7)-type)catalysts with disordered defective cubic fluorite phased structure were successfully prepared by a colloidal crystal template method.3DOM structure promotes the accessibility of the gaseous reactants(O2and CH4)to the active sites.The co-doping of Ca and Sr ions in La_(2-x)Sr_(x)Ce_(2-y)CayO_(7-δ)catalysts improved the formation of oxygen vacancies,thereby leading to increased density of surface-active oxygen species(O_(2)^(-))for the activation of CH4and the formation of C2products(C2H6and C2H4).3DOM La_(2-x)Sr_(x)Ce_(2-y)CayO_(7-δ)catalysts exhibit high catalytic activity for OCM at low temperature.3DOM La1.7Sr0.3Ce1.7Ca0.3O7-δcatalyst with the highest density of O_(2)^(-)species exhibited the highest catalytic activity for low-temperature OCM,i.e.,its CH4conversion,selectivity and yield of C2products at 650℃are 32.2%,66.1%and 21.3%,respectively.The mechanism was proposed that the increase in surface oxygen vacancies induced by the co-doping of Ca and Sr ions boosts the key step of C-H bond breaking and C-C bond coupling in catalyzing low-temperature OCM.It is meaningful for the development of the low-temperature and high-efficient catalysts for OCM reaction in practical application.

关键词： 3DOM catalysts Ca ions Sr ions Low-temperature oxidative couplingof methane Oxygen vacancies O_(2)^(-) species

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Millimeter waves in medical applications:status and prospects

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Intelligent Medicine 2024年第1期4卷 16-21页

作者： Honglin Wang Lin Lu Pengran liu Jiayao Zhang Songxiang liu Yi Xie tongtong Huo Hong Zhou Mingdi Xue Ying Fang Jiaming Yang Zhewei Ye Department of Orthopedics Surgery Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhanHubei 430022China Departments of Orthopedics Renmin Hospital of Wuhan UniversityWuhanHubei 430060China

Millimeter waves are electromagnetic waves with wavelengths of 1–10 mm,which have characteristics of high frequency and short wavelength.They have gradually and widely been used in engineering and medical fields.We have identified studies related to millimeter waves in the biomedical field and summarized the biological effects of millimeter waves and their current status in medical applications.Finally,the shortcomings of existing studies and future developments were analyzed and discussed,with the aim of providing a reference for further research and development of millimeter waves in the medical field.

关键词： Millimeter wave Biological effects Medical applications Vital signs monitoring

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Analysis of Knowledge Level and Use of Antiretroviral Pre-Exposure and Post-Exposure Prophylaxis Among MSM—China,2019–2022

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China CDC weekly 2023年第13期5卷 292-296页

作者： Jiahuan Guo Wenting Kang tongtong liu Jie Xu Houlin Tang Fan Lyu Guang Zhang National Center for AIDS/STD Control and Prevention Chinese Center for Disease Control and PreventionBeijingChina Chinese Association of STD&AIDS Prevention and Control BeijingChina Chinese Center for Health Education BeijingChina

Summary What is already known on this topic?Men who have sex with men(MSM)in China have a high rate of human immunodeficiency virus(HIV)infection.Pre-exposure prophylaxis(PrEP)and postexposure prophylaxis(PEP)have been shown to be effective in preventing HIV,which may help to contain the HIV epidemic among MSM.What is added by this report?This study found that knowledge and usage of PrEP were low among MSM,indicating that this population is at high risk for HIV infection.Promotion of PrEP and PEP among MSM is necessary to reduce the risk of HIV infection in this population.What are the implications for public health practice?PrEP and PEP are novel HIV prevention strategies that have been demonstrated to be effective and safe.To further reduce HIV transmission among MSM in China,it is necessary to promote the use of PrEP and PEP.

关键词： prevention MSM immunodeficiency

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Intelligent diagnosis of atrial septal defect in children using echocardiography with deep learning

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虚拟现实与智能硬件（中英文） 2024年第3期6卷 217-225页

作者： Yiman liu Size HOU Xiaoxiang HAN tongtong LIANG Menghan HU Xin WANG Wei GU Yuqi ZHANG Qingli LI Jiangang CHEN Shanghai Key Laboratory of Multidimensional Information Processing School of Communication&Electronic EngineeringEast China Normal UniversityShanghaiChina Department of Pediatric Cardiology Shanghai Children's Medical CenterSchool of MedicineShanghai Jiao Tong UniversityShanghaiChina Department of Applied Mathematics Xi'an Jiaotong-Liverpool UniversitySchool of ScienceSuzhouChina School of Health Sciences and Engineering University of Shanghai for Science and TechnologyShanghaiChina Minhang District Centers for Disease Control and Prevention ShanghaiChina Faculty of Traditional Chinese Medicine Naval Medical UniversityShanghaiChina Engineering Research Center of Traditional Chinese Medicine Intelligent Rehabilitation Ministry of EducationShanghai 201203China

Background Atrial septal defect(ASD)is one of the most common congenital heart diseases.The diagnosis of ASD via transthoracic echocardiography is subjective and time-consuming.Methods The objective of this study was to evaluate the feasibility and accuracy of automatic detection of ASD in children based on color Doppler echocardiographic static images using end-to-end convolutional neural networks.The proposed depthwise separable convolution model identifies ASDs with static color Doppler images in a standard view.Among the standard views,we selected two echocardiographic views,i.e.,the subcostal sagittal view of the atrium septum and the low parasternal four-chamber view.The developed ASD detection system was validated using a training set consisting of 396 echocardiographic images corresponding to 198 cases.Additionally,an independent test dataset of 112 images corresponding to 56 cases was used,including 101 cases with ASDs and 153 cases with normal hearts.Results The average area under the receiver operating characteristic curve,recall,precision,specificity,F1-score,and accuracy of the proposed ASD detection model were 91.99,80.00,82.22,87.50,79.57,and 83.04,respectively.Conclusions The proposed model can accurately and automatically identify ASD,providing a strong foundation for the intelligent diagnosis of congenital heart diseases.

关键词： Deep learning Atrial septal defect Echocardiography

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Brassinosteroid signaling regulates phosphate starvation-induced malate secretion in plants

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Journal of Integrative Plant Biology 2023年第5期65卷 1099-1112页

作者： tongtong liu Suren Deng Cheng Zhang Xu Yang Lei Shi Fangsen Xu Sheliang Wang Chuang Wang Microelement Research Center College of Resources&EnvironmentHuazhong Agricultural UniversityWuhan430070 China Key Laboratory of Arable Land Conservation(Middle and Lower Reaches of Yangtze River) Ministry of AgricultureHuazhong Agricultural UniversityWuhan430070 China

Inorganic phosphate(Pi)is often limited in soils due to precipitation with iron(Fe)and aluminum(Al).To scavenge heterogeneously distributed phosphorus(P)resources,plants have evolved a local Pi signaling pathway that induces malate secretion to solubilize the occluded Fe-P or Al-P oxides.In this study,we show that Pi limitation impaired brassinosteroid signaling and downregulated BRASSINAZOLE-RESISTANT 1(BZR1)expression in Arabidopsis thaliana.Exogenous 2,4-epibrassinolide treatment or constitutive activation of BZR1(in the bzr1-D mutant)significantly reduced primary root growth inhibition under Pi-starvation conditions by downregulating ALUMINUM-ACTIVATED MALATE TRANSPORTER 1(ALMT1)expression and malate secretion.Furthermore,At BZR1 competitively suppressed the activator effect of SENSITIVITY TO PROTON RHIZOTOXICITY 1(STOP1)on ALMT1 expression and malate secretion in Nicotiana benthamiana leaves and Arabidopsis.The ratio of nuclear-localized STOP1 and BZR1 determined ALMT1 expression and malate secretion in Arabidopsis.In addition,BZR1-inhibited malate secretion is conserved in rice(Oryza sativa).Our findings provide insight into plant mechanisms for optimizing the secretion of malate,an important carbon resource,to adapt to Pi-deficiency stress.

关键词： ALMT1 brassinosteroid signaling bzr1 malate phosphate deficiency STOP1

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Optimal Timing of Antiretroviral Therapy Initiation in Acquired Immunodeficiency Syndrome-Associated Toxoplasmic Encephalitis:A Prospective Observational Multicenter Study in China

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Infectious Diseases & Immunity 2024年第1期4卷 4-9页

作者： Yao Li Haidong Jiang Yanming Zeng Yanqiu Lu Siyuan Chen Yulin Zhang Zhongsheng Jiang tongtong Yang Shuiqing liu Yaokai Chen Department of Infectious Diseases Chongqing Public Health Medical CenterChongqing 400036China Center for Infectious Diseases Beijing Youan HospitalCapital Medical UniversityBeijing 100069China Department of Infectious Diseases Liuzhou People's HospitalLiuzhou 545006GuangxiChina Department of Infectious Disease The Public Health Clinical Center of ChengduChengdu 610066SichuanChina Department of Infectious Disease Guiyang Public Health Clinical CenterGuiyang 550004GuizhouChina

Background:Toxoplasmic encephalitis(TE)is the most frequent cause of expansive brain lesions among patients with acquired immunodeficiency syndrome(AIDS).However,the optimal timing of antiretroviral therapy(ART)initiation in these patients remains controversial.This study aims to investigate the differences in outcomes of ART initiation at different times,in order to help clarify the treatment timing of AIDS-associated TE.Methods:This multicenter prospective observational study included 87 patients recruited from 11 research centers in China(from March 2019 to December 2022).Of the patients,38 were assigned to the early ART group(initiating ART within 2 weeks after anti-Toxoplasma treatment initiation),and the remaining 49 patients received deferred ART(initiating ART at least 2 weeks after anti-Toxoplasma treatment initiation).The main outcomes includedmortality and emergence of immune reconstitution inflammatory syndrome(IRIS).Human immunodeficiency virus(HIV)-1 viral load and CD4^(+)T-cell counts at weeks 24 and 48 were observed.Results:The number of deaths(1 vs.5,P=0.225)and incidence of IRIS(2.6%vs.0,P=0.437)were not significantly different between the early and deferred ART groups at week 48.Early ART initiation did not contribute significantly to HIV-1 viral load control(<50 copies/mL,n=8 vs.n=3 at week 24,P=0.142;n=7 vs.n=7 atweek 48,P=1.000).The median CD4^(+)T-cell counts between the two groups were not significantly different,either at week 24(155 vs.91 cells/mm^(3),P=0.837)or atweek 48(181 vs.146 cells/mm^(3),P=0.219).Conclusion:In patients with AIDS-associated TE,early ART initiation was not significantly different from deferred ART initiation in terms of incidence of mortality,IRIS,and HIV virological and immunological outcomes.Trial registration:This study was registered(registration number:ChiCTR1900021195)as one of 12 clinical trials under the title of a general project at the Chinese Clinical Trial Registry(chictr.gov)on February 1,2019.Enrollment for this study began inMarch 2019.

关键词： HIV Toxoplasma gondii Timing of antiretroviral therapy Virological outcome Immunological response

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