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Metal complexes of bipyridine-functionalized covalent organic frameworks as efficient electrocatalysts for oxygen evolution reaction

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Rare Metals 2024年第7期43卷 3096-3106页

作者： Zhuang-Zhuang Wu Tian Xia Ying liang Yong-Peng li Zhu-Yin Sui li-Juan Feng Dao-xiong Wu Xin-Long Tian Qi Chen State Key Laboratory of Marine Resource Utilization in South China Sea School of Marine Science and EngineeringHainan UniversityHaikou 570228China School of Chemistry and Chemical Engineering Yantai UniversityZhuhai519041China School of Bioengineering Zhuhai Campus of Zunyi Medical UniversityZhuhai519041China

Electrocatalytic water splitting is considered a clean and practic al method for producing *** this study,COF-Bpy,a bipyridine-functionalized covalent organic framework(COF),was prepared via post-synthetic modification,after which electrocatalysts for the oxygen evolution reactions(OER)were formed through coordination to single-or double-transition metals(Fe,Co,Ni,FeCo,FeNi or CoNi).COF-Bpy@FeNi delivered the best OER performance among the studied electrocatalysts,with an overpotential of 399 mV at 10 mA·cm^(-2)in an alkaline electrolyte(1.0 mol·L^(-1)KOH aqueous).Notably,the electrocatalytic performance of COF-Bpy@FeNi showed slight degradation during durability testing,which is ascribable to its irreversible benzoquinoline structure and strong metal *** expected,COF-Bpy@FeNi exhibited a low overpotential of 347 mV at a turnover frequency(TOF)of 0.1 s^(-1),which suggests that COF-Bpy@FeNi possesses excellent intrinsic electroc atalytic OER ***,density functional theory(DFT)calculations reveal that the Ni site plays a major role,while the Fe site adjusts the electronic structure of the Ni ions,which rationalizes the excellent OER properties of COF-Bpy@*** study not only provides a simple and efficient method for complexing COFs with transition metals,but also offers a novel strategy for designing porous organic polymer electrocatalysts.

关键词： Covalent organic framework Oxygen evolution reactions(OER)electrocatalyst Nickel-iron synergy Water splitting

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Field experimental study on the effect of thawed depth of frozen alpine meadow soil on rill erosion by snowmelt waterflow

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International Soil and Water Conservation Research 2024年第1期12卷 54-63页

作者： Ying Zheng Xiaonan Shi Fan Zhang Tingwu Lei Chen Zeng xiong Xiao li Wang Guanxing Wang State Key Laboratory of Tibetan Plateau Earth System Resources and Environment(TPESRE)Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing100101China University of Chinese Academy of Sciences Beijing100101China State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai UniversityNanjing210098China College of Water Resources and Civil Engineering China Agricultural UniversityBeijing100083China College of Geographic Science Hunan Normal UniversityChangsha410081China

Soil erosion by snow or ice melt waterflow is an important type of soil erosion in many high-altitude and high-latitude regions and is further aggravated by climate *** snowmelt waterflow erosion process is affected by soil freeze-thaws and is highly dynamically *** this study,a methodology was developed to conduct in situ field experiments to investigate the effects of the thawed depth of the frozen soil profile on snowmelt waterflow *** method was implemented on an alpine meadow soil slope at an altitude of 3700 m on the northeastern Tibetan *** erosion experiments involved five thawed soil depths of 0,10,30(35),50,and 80(100)mm under two snowmelt waterflow rates(3 and 5 L/min).When the topsoil was fully frozen or shallow-thawed(≤10 mm),its hydrothermal and structural properties caused a significant lag in the initiation of runoff and delayed soil erosion in the initial *** runoff and sediment concentration curves for fully frozen and shallow-thawed soil showed two-stage patterns characteristic of a sediment supply limited in the early stage and subject to hydrodynamic-controlled processes in the later ***,this effect did not exist where the thawed soil depth was greater than 30 *** deep-thawed cases(≥30 mm)showed normal hydrograph and sedigraph patterns similar to those of the unfrozen *** findings of this study are important for understanding the erosion rates of partially thawed soil and for improving erosion simulations in cold regions.

关键词： Snowmelt waterflow erosion Hillslope erosion process Soil freeze and thaw Runoff generation In situ experimental method

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Air-Ground Collaborative Mobile Edge Computing:Architecture,Challenges,and Opportunities

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China Communications 2024年第5期21卷 1-16页

作者： Qin Zhen He Shoushuai Wang Hai Qu Yuben Dai Haipeng xiong Fei Wei Zhenhua li Hailong College of Communications Engineering Army Engineering University of PLANanjing 210000China Department of Information and Communication Noncommissioned Officer Academy of PAPHangzhou 310000China Key Laboratory of Dynamic Cognitive System of Electromagnetic Spectrum Space Ministry of Industry and Information TechnologyNanjing 211106China College of Electronic and Information Engineering Nanjing University of Aeronautics and AstronauticsNanjing 211106China State Key Laboratory for Novel Software Technology Nanjing UniversityNanjing 210023China CMC Political and Law Commission Beijing100120China Xi’an Research Institute of High Technology Xi’an 710025China

By pushing computation,cache,and network control to the edge,mobile edge computing(MEC)is expected to play a leading role in fifth generation(5G)and future sixth generation(6G).Nevertheless,facing ubiquitous fast-growing computational demands,it is impossible for a single MEC paradigm to effectively support high-quality intelligent services at end user equipments(UEs).To address this issue,we propose an air-ground collaborative MEC(AGCMEC)architecture in this *** proposed AGCMEC integrates all potentially available MEC servers within air and ground in the envisioned 6G,by a variety of collaborative ways to provide computation services at their best for ***,we introduce the AGC-MEC architecture and elaborate three typical use ***,we discuss four main challenges in the AGC-MEC as well as their potential ***,we conduct a case study of collaborative service placement for AGC-MEC to validate the effectiveness of the proposed collaborative service placement ***,we highlight several potential research directions of the AGC-MEC.

关键词： air-ground architecture collaborative mobile edge computing

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Convergent synthesis and immunological study of oligosaccharide derivatives related to galactomannan from Antrodia cinnamomea

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Chinese Chemical Letters 2024年第5期35卷 155-160页

作者： Shuying li Weiwei ZhuGe Xuan Sun Chongzhen Sun Zhaojun liu Chenghe xiong Min Xiao Guofeng Gu National Glycoengineering Research Center and Shandong Key Laboratory of Carbohydrate Chemistry and Glycobiology Shandong UniversityQingdao 266237China NMPA Key Laboratory for Quality Research and Evaluation of Carbohydrate-based Medicine Shandong UniversityQingdao 266237China

The galactomannan from Antrodia cinnamomea(AC)is characterized as one of the important bioactive components that exhibits potential immunostimulatory *** biological function of its corresponding oligosaccharide fragments has not been revealed *** this study,we reported the first chemical synthesis of the series of oligosaccharide fragments related to AC galactomannan via the convergent glycosylation *** preliminary immunological evaluation of these synthesized AC oligosaccharides disclosed that the backbone tetrasaccharide 1d showed the best immunomodulatory ability on enhancing proliferation,phagocytosis and cytokines secretion of Raw264.7 macrophages in vitro,indicating its immense potential as an immunostimulant candidate.

关键词： Antrodia cinnamomea Galactomannan Oligosaccharide Immunostimulatory propriety Chemical synthesis

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Lactiplantibacillus plantarum AR113 alleviates microbiota dysbiosis of tongue coating and cerebral ischemia/reperfusion injury in rat

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Food Science and Human Wellness 2024年第4期13卷 2132-2140页

作者： Zhiqiang xiong Gang liu ling Fang Xiuming li Yongjun Xia Guangqiang Wang Xin Song lianzhong Ai Shanghai Engineering Research Center of Food Microbiology School of Health Science and EngineeringUniversity of Shanghai for Science and TechnologyShanghai 200093China Department of Rehabilitation Huashan HospitalFudan UniversityShanghai 200040China Department of Rehabilitation Medicine Ruijin HospitalShanghai Jiao Tong University School of MedicineShanghai 200025China

Stroke is one of the leading causes of death and disability ***,information on stroke-related tongue coating microbiome(TCM)is limited,and whether TCM modulation could benefit for stroke prevention and rehabilitation is ***,TCM from stroke patients(SP)was characterized using molecular *** occurrence of stroke resulted in TCM dysbiosis with significantly reduced species richness and *** abundance of Prevotella,Leptotrichia,Actinomyces,Alloprevotella,Haemophilus,and TM7_[G-1]were greatly reduced,but common infection Streptococcus and Pseudomonas were remarkably ***,an antioxidative probiotic Lactiplantibacillus plantarum AR113 was used for TCM intervention in stroke rats with cerebral ischemia/reperfusion(I/R).AR113 partly restored I/R induced change of TCM and gut microbiota with significantly improved neurological deficit,relieved histopathologic change,increased activities of antioxidant enzymes,and decreased contents of oxidative stress ***,the gene expression of antioxidant-related proteins and apoptosis-related factors heme oxygenase-1(HO-1),superoxide dismutase(SOD),glutathione peroxidase(GSH-Px),nuclear factor erythroid 2-related factor 2(Nrf2),NAD(P)H:quinone oxidoreductase-1(NQO-1),and Bcl-2 was significantly increased,but cytochrome C,cleaved caspase-3,and Bax were markedly decreased in the brain by AR113 *** results suggested that AR113 could ameliorate cerebral I/R injury through antioxidation and anti-apoptosis pathways,and AR113 intervention of TCM may have the application potential for stroke prevention and control.

关键词： Stroke Cerebral ischemia/reperfusion Tongue coating Lactiplantibacillus plantarum AR113 Probiotic intervention

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A comparison study on structure-function relationship of polysaccharides obtained from sea buckthorn berries using different methods:antioxidant and bile acid-binding capacity

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Food Science and Human Wellness 2024年第1期13卷 494-505页

作者： Qiaoyun li Zuman Dou Qingfei Duan Chun Chen Ruihai liu Yueming Jiang Bao Yang xiong Fu SCUT-Zhuhai Institute of Modern Industrial Innovation School of Food Science and EngineeringSouth China University of Technology381 Wushan RoadGuangzhou 510640China Guangzhou Institute of Modern Industrial Technology Nansha 511458China Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety Guangzhou 510640China Overseas Expertise Introduction Center for Discipline Innovation of Food Nutrition and Human Health(111 Center) Guangzhou 510640China Department of Food Science Stocking HallCornell UniversityIthaca 14853USA South China Botanical Garden Chinese Academy of SciencesGuangzhou 510650China

In this study,the structural characters,antioxidant activities and bile acid-binding ability of sea buckthorn polysaccharides(HRPs)obtained by the commonly used hot water(HRP-W),pressurized hot water(HRP-H),ultrasonic(HRP-U),acid(HRP-C)and alkali(HRP-A)assisted extraction methods were *** results demonstrated that extraction methods had significant effects on extraction yield,monosaccharide composition,molecular weight,particle size,triple-helical structure,and surface morphology of HRPs except for the major linkage *** analysis showed that HRP-U with filamentous reticular microstructure exhibited better thermal *** HRP-A with the lowest molecular weight and highest arabinose content possessed the best antioxidant ***,the rheological analysis indicated that HRPs with higher galacturonic acid content and molecular weight showed higher viscosity and stronger crosslinking network(HRP-C,HRP-W and HRP-U),which exhibited stronger bile acid binding *** present findings provide scientific evidence in the preparation technology of sea buckthorn polysaccharides with good antioxidant and bile acid binding capacity which are related to the structure affected by the extraction methods.

关键词： Sea buckthorn Extraction method Structure Rheological properties Antioxidant activity Bile acid binding capacity

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Clinical effects of nonconvulsive electrotherapy combined with mindfulness-based stress reduction and changes of serum inflammatory factors in depression

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World Journal of Psychiatry 2024年第5期14卷 653-660页

作者： Zhi-Wen Gu Chun-Ping Zhang li-Ping Chen xiong Huang Department of Psychiatry Guangzhou First People's HospitalSouth China University of TechnologyGuangzhou 510180Guangdong ProvinceChina Department of Psychiatry The Affiliated Brain Hospital of Guangzhou Medical University(Guangzhou HuiAi Hospital)Guangzhou 510370Guangdong ProvinceChina

BACKGROUND Depression is a common and serious psychological condition,which seriously affects individual well-being and functional *** treatment methods include drug therapy and psychological counseling;however,these methods have different degrees of side effects and *** recent years,nonconvulsive electrotherapy(NET)has attracted increasing attention as a noninvasive treatment ***,the clinical efficacy and potential mechanism of NET on depression are still *** hypothesized that NET has a positive clinical effect in the treatment of depression,and may have a regulatory effect on serum inflammatory factors during *** To assess the effects of NET on depression and analyze changes in serum inflammatory *** This retrospective study enrolled 140 patients undergoing treatment for depression between May 2017 and June 2022,the observation group that received a combination of mindfulness-based stress reduction(MBSR)and NET treatment(n=70)and the control group that only received MBSR therapy(n=70).The clinical effectiveness of the treatment was evaluated by assessing various factors,including the Hamilton Depression Scale(HAMD)-17,self-rating idea of suicide scale(SSIOS),Pittsburgh Sleep Quality Index(PSQI),and levels of serum inflammatory factors before and after 8 wk of *** quality of life scores between the two groups were *** were made using t and χ^(2) *** After 8 wk of treatment,the observation group exhibited a 91.43%overall effectiveness rate which was higher than that of the control group which was 74.29%(64 vs 52,χ^(2)=7.241;P<0.05).The HAMD,SSIOS,and PSQI scores showed a significant decrease in both ***,the observation group had lower scores than the control group(10.37±2.04 vs 14.02±2.16,t=10.280;1.67±0.28 vs 0.87±0.12,t=21.970;5.29±1.33 vs 7.94±1.35,t=11.700;P both<0.001).Additionally,there was a notable decrease in the IL-2,IL-1β,and IL-6 in both gr

关键词： Depression Nonconvulsive electrotherapy Mindfulness-based stress reduction Serum inflammatory factors Clinical effect Hamilton Depression Scale

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Dynamic tracking of exsolved PdPt alloy/perovskite catalyst for efficient lean methane oxidation

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Chinese Chemical Letters 2024年第4期35卷 170-175页

作者： Yanling Yang Zhenfa Ding Huimin Wang Jianhui li Yanping Zheng Hongquan Guo li Zhang Bing Yang Qingqing Gu Haifeng xiong Yifei Sun College of Energy Xiamen UniversityXiamen 361005China School of Environment and Civil Engineering Dongguan University of TechnologyDongguan 523808China Department of Chemistry College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China CAS Key Laboratory of Science and Technology on Applied Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province(IKKEM) Xiamen 361102China

Supported Pd based catalysts are considered as the efficient candidates for low-carbon alkane oxidation for their outstanding capability to break C-H bond. Whereas, the irreversible deactivation of Pd based catalysts was still frequently observed. Herein, we reinforced the extruded Pd nanoparticles with quantitive Pt to assemble the evenly distributed Pd Pt nanoalloy onto ferrite perovskite(Pd Pt-LCF) matrix with strengthened robustness of metal/oxide support interface. We further co-achieved the enhanced performance, anti-overoxidation as well as resistance of vapor-poisoning in durability measurement. The operando X-ray photoelectron spectroscopy(O-XPS) combined with various morphology characterizations confirms that the accumulation of surface deep-oxidation species of Pd^(4+) is the culprit for fast activity loss in exsolved Pd system, especially at high temperature of 400 ℃. Conversely, it could be completely suppressed by in-situ alloying Pd with equal amount of Pt, which helps maintain the metastable Pd^(2+)/Pd shell and metallic solid-solution core structure. The density function theory(DFT) calculations further buttress that the dissociation of C–H was facilitated on alloy/perovskite interface which is, on the contrary, resistant toward O–H bond cleavage, as compared to Pd/perovskite. Our work suggests that the modification of exsolved metal/oxide catalytic interface could further enrich the toolkit of heterogeneous catalyst design.

关键词： Exsolution PdPt alloy Operando characterization Methane conversion Deep-oxidation

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Circulating glycated albumin levels and gestational diabetes mellitus

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World Journal of Diabetes 2024年第8期15卷 1802-1810页

作者： Wei xiong Zhao-Hui Zeng Yuan Xu Hui li Hui lin Department of Medical Hunan Traditional Chinese Medical CollegeZhuzhou 412012Hunan ProvinceChina Department of Outpatient Zhuzhou Second HospitalZhuzhou 412012Hunan ProvinceChina

BACKGROUND Gestational diabetes mellitus(GDM)is characterized by glucose intolerance that is first diagnosed during pregnancy,making it the most common complication associated with this *** detection and targeted treatment of GDM can minimize foetal exposure to maternal hyperglycaemia and subsequently reduce the associated adverse pregnancy *** studies have inconsistently suggested that the level of glycated albumin(GA)might predict *** To review and synthesize existing evidence to evaluate the relationship between GA levels and the development of *** We sought to compare GA levels between GDM and control groups in this metaanalysis by systematically searching the Web of Science,PubMed,Cochrane library,and Embase databases for articles published up to June *** analysis utilized the weighted mean difference(WMD)as the primary *** data were meticulously extracted,and the quality of the included studies was ***,we conducted a subgroup analysis based on study region and sample *** assessed heterogeneity using I2 statistics and evaluated publication bias through funnel ***,trim-and-fill analysis was employed to detect and address any potential publication *** The meta-analysis included a total of 11 studies involving 5477 participants,comprising 1900 patients with GDM and 3577 control *** synthesized results revealed a notable correlation between elevated GA levels and increased susceptibility to *** calculated WMD was 0.42,with a 95%confidence interval(95%CI)ranging from 0.11 to 0.74,yielding a P value less than *** specific GA levels,the mean GA level in the GDM group was 12.6,while for the control group,it was lower,at *** discrepancy underscores the potential of GA as a biomarker for assessing GDM ***,we explored the levels of glycated haemoglobin(HbA1c)in both *** WMD for HbA1c was 0.19,with a 95%CI ranging from 0.15 to 0.

关键词： Glycated albumin Gestational diabetes mellitus Diabetes mellitus Meta-analysis Weighted mean difference

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Resolving controversies surrounding carbon sinks from carbonate weathering

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Science China Earth Sciences 2024年第9期67卷 2705-2717页

作者： Xiaoyong BAI Sirui ZHANG Pete SMITH Chaojun li lian xiong Chaochao DU Yingying XUE Zilin li mingkang LONG minghui li Xiaoyun ZHANG Shu YANG Qing LUO Xiaoqian SHEN State Key Laboratory of Environmental Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang 550081China University of Chinese Academy of Sciences Beijing 100049China Institute of Biological and Environmental Sciences University of AberdeenAberdeen AB243UUUK College of Resources and Environmental Engineering Guizhou UniversityGuiyang 550025China School of Geography and Environmental Sciences Guizhou Normal UniversityGuiyang 550025China CAS Center for Excellence in Quaternary Science and Global Change Xi’an 710061China

The importance of carbonate weathering carbon sinks(CCSs)is almost equal to that of vegetation photosynthesis in the global carbon ***,CCSs have become controversial in formulating carbon neutral policies to deal with global climate problems in various countries,since the carbonate dissolution is *** order to address these controversies,we reviewed recent advances in understanding CCSs and examined the outstanding controversies surrounding *** have analyzed the five controversies,revealing the existence of CCSs,quantifying their magnitude,clarifying their spatiotemporal pattern,and documenting how they have increased and how they evolved under the background of global *** addressing these five controversies,we help to bring clarity to the role of CCSs in the carbon cycle of global terrestrial ecosystems.

关键词： Carbon sink Carbonate weathering Carbon cycle Climate change Anthropogenic driver

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