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Microscopic and spectroscopic analysis of atmospheric iron-containing single particles in Lhasa,Tibet

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Journal of Environmental sciences 2024年第7期141卷 40-50页

作者： Junyu chen Daobin Zhang Yiran fu Jinhu Wang Xiaomei Cui Ci-ren Qu-zong Qiangying Zhang Chan Jin Bu Duo School of Ecology and Environment Tibet UniversityLhasa 850000China Shanghai institute of Applied Physics Chinese Academy of SciencesShanghai 201800China institute of Tibetan Plateau Research Chinese Academy of SciencesBeijing 100101China

The Tibetan Plateau,known as the“Third Pole”,is currently in a state of perturbation caused by intensified human *** this study,56 samples were obtained at the five sampling sites in typical area of Lhasa city and their physical and chemical properties were investigated by TEM/EDS,STXM,and NEXAFS *** careful examination of 3387single particles,the results showed that Fe should be one of the most frequent metal *** Fe-containing single particles in irregular shape and micrometer size was about7.8%and might be mainly from local ***,the Fe was located on the subsurface of single particles and might be existed in the form of iron ***,the core-shell structure of iron-containing particles were about 38.8%and might be present as single-,dual-or triple-core shell structure and multi-core shell structure with the Fe/Si ratios of 17.5,10.5,2.9 and 1.2.***,iron and manganese were found to coexist with identical distributions in the single particles,which might induce a synergistic effect between iron and manganese in catalytic ***,the solid spherical structure of Fe-containing particles without an external layer were about 53.4%.The elements of Fe and Mn were co-existed,and might be presented as iron oxide-manganese oxide-silica ***,the ferrous and ferric forms of iron might be *** information can be valuable in expanding our understanding of Fe-containing particles in the Tibetan Plateau atmosphere.

关键词： Fe-containing single particle Irregular shape Core-shell structure Solid spherical structure Transmission electron microscopy Synchrotron X-ray microscopy

Enhancing visible-light-driven NO oxidation through molecular‐level insights of dye-loaded sea sands

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Rare Metals 2024年第2期43卷 543-554页

作者： Yu-Han Li Bang-fu chen Sónia A.C.Carabineiro You-Yu Duan Ping Tan Wing-Kei Ho Fan Dong Engineering Research Center for Waste Oil Recovery Technology and Equipment Ministry of EducationChongqing Key Laboratory of Catalysis and New Environmental MaterialsChongqing Technology and Business UniversityChongqing400067China Nanchang institute of Technology Nanchang33044China LAQV-REQUIMTE Department of ChemistryNOVA School of Science and TechnologyUniversidade NOVA de Lisboa2829-516CaparicaPortugal College of Physics and Center of Quantum Materials and Devices Chongqing UniversityChongqing401331China Department of Science and Environmental Studies The Education University of Hong KongHong Kong999077China

Natural minerals,abundant and easily obtained through simple physical processing,offer a cost-effective and environmentally friendly solution for dyeing wastewater disposal and air pollution *** study investigates the photocatalytic removal of NO using natural different types of dyes,loaded on natural sand,under visible light *** examining various coating concentrations of dyes and sand weights,we discovered that sand loaded with Rhodamine B(RhB)exhibits high activity for the photo-oxidation of NO.A combination results of X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),Fourier transform infrared spectroscopy(FTIR)and thermogravimetric(TG)analyses confirm the presence of SiO_(2.,CaCO_(3),Al_(2.O_(3)and iron oxides as the main components of the ***,studying RhB-loaded individual components reveals that CaCO_(3)plays a crucial role in enhancing the NO removal *** results and theoretical calculations demonstrate the establishment of a directional charge transfer channel from CaCO_(3)to RhB,facilitating the adsorption and activation of molecular NO and O_(2..This work not only promotes the utilization of natural mineral resources but also enriches the fields of environmental photochemistry and semiconductor photocatalysis.

关键词： Sand dyes Rhodamine B Photo-oxidation of NO Visible light illumination

Enhanced activity and durability of FeCoCrMoCBY nanoglass in acidic hydrogen evolution reaction

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Journal of Materials Science & Technology 2024年第3期170卷 212-220页

作者： Mengyang Yan Shuangqin chen Shangshu Wu Xuechun Zhou Shu fu Di Wang Christian Kübel Horst Hahn Si Lan Tao Feng Herbert Gleiter institute of Nanoscience School of Material Science and EngineeringNanjing University of Science and TechnologyNanjing 210094China institute of Nanotechnology Karlsruhe Institute of TechnologyKarlsruhe 76021Germany

In the present work,a multi-element nanoglass(m-NG)of FeCoCrMoCBY is obtained first time by the laser ablation combined with inert gas condensation(laser-IGC)*** with the conventional rapid-quenched metallic glass(MG)with identical composition,the Fe-based m-NG demonstrates a superior performance as a self-supported electrocatalyst for hydrogen evolution reaction(HER)in acidic *** enhanced HER activity of m-NG is proposed to be closely related to its high en-ergy states,which is originated from the unique inhomogeneous nanostructures with a high density of low-coordinated ***,the Fe-based m-NG exhibits an outstanding comprehensive catalytic performance even beyond the commercial Pt/C catalyst in long-term test due to its self-optimization *** work not only opens the way to the preparation of m-NGs by the novel laser-IGC technique,but also makes a great contribution to developing low-cost,high-efficient,and super-durable HER electrocat-alysts in acidic environment.

关键词： Nanoglass Inert gas condensations High energy states Hydrogen evolution reactions

Reduced macular thickness and vascular density in abnormal glucose metabolism patients:A meta-analysis of optical coherence tomography(OCT)and OCT angiography studies

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chinese Medical Journal 2024年第9期137卷 1054-1068页

作者： Xiangyu fu Xiang Ren Wenyue chen Danian chen Department of Ophthalmology West China HospitalSichuan UniversityChengduSichuan 610041China Research Laboratory of Ophthalmology and Vision sciences State Key Laboratory of BiotherapyWest China HospitalSichuan UniversityChengduSichuan 610041China Department of Ophthalmology The People’s Hospital of Guizhou ProvinceGuiyangGuizhou 550002China

Background:Alterations in macular thickness and vascular density before clinically visible diabetic retinopathy(DR)remain *** study aimed to determine whether retinal manifestations in abnormal glucose metabolism(AGM)patients differ from those in the healthy ***:PubMed,Embase,and Web of Science were searched between 2.00 and *** eligibility criteria were AGM patients without *** and secondary outcomes measured by optical coherence tomography(OCT)and OCT angiography(OCTA)were analyzed and expressed as standardized mean differences(SMDs)with 95%confidence intervals(CIs).A random-effects model was used in the data *** potential publication bias for the variables was evaluated using Egger’s ***:A total of 86 observational studies involving 13,773 participants and 15,416 eyes were *** revealed that compared to healthy controls,the total macular thickness of AGM patients was thinner,including the thickness of fovea(-0.2.,95%CI[-0.39,-0.08];P=0.002.I^(2.=87.7%),all regions of parafovea(-0.32.95%CI[-0.54,-0.11];P=0.003;I^(2.=71.7%)and the four quadrants of perifovea;the thickness of peripapillary retinal nerve fiber layer(pRNFL),macular retinal nerve fiber layer(mRNFL),and ganglion cell layer(GCL)also *** indicated that the superficial and deep vascular density decreased,the foveal avascular zone(FAZ)area enlarged,and the acircularity index(AI)reduced in AGM ***:Retinal thinning and microvascular lesions have occurred before the advent of clinically detectable DR;OCT and OCTA may have the potential to detect these preclinical ***:PROSPERO;http://***/prospero/;***42.2.2.9885.

关键词： Abnormal glucose metabolism Optical coherence tomography Optical coherence tomography angiography Diabetic retinopathy Prediabetes Meta-analysis

Characteristics and origin of low-organicmatter carbonate source rocks in the Middle-Upper Ordovician, Tarim Basin, northwestern china

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Journal of Palaeogeography 2024年第3期13卷 594-619页

作者： Jun-Qing chen fu-Jie Jiang Xiong-Qi Pang Hai-Jun Yang Kan-Yuan Shi Bo Pang Hong Pang Jian-Fa chen Zhuo-Heng chen Xin-Gang Zhang Song Wu State Key Laboratory of Petroleum Resources and Engineering China University of Petroleum(Beijing)Beijing 102249China Basic Research Center for Energy Interdisciplinary College of ScienceChina University of Petroleum(Beijing)Beijing 102249China Beijing Key Laboratory of Optical Detection Technology for Oil and Gas China University of Petroleum(Beijing)Beijing 102249China College of Geosciences China University of Petroleum(Beijing)Beijing 102249China Research institute of Petroleum Exploration and Development PetroChina Tarim Oilfield CompanyKorla 841000Xinjiang Uygur Autonomous RegionChina Geological Survey of Canada Natural Resources CanadaCalgary T2L 2A7Canada

The continually-discovered large volumes of marine hydrocarbons indicate a huge exploration potential within the carbonate rocks of Ordovician in the Tarim Basin,northwestern *** Middle-Upper Ordovician(O2.3)carbonate source rocks are at a highly mature *** rocks presently contain a low amount of total organic carbon(TOC_(pd)≤0.5%)(TOC_(pd) means the present-day TOC).A mass balance approach is used to identify the source rocks that have expelled *** characteristics and origin of hydrocarbon expulsion from low-TOC_(pd) source rocks are studied,which are significant for oil exploration in the *** results showed that a low-TOC_(pd) O2.3 source rock having expelled hydrocarbons was type I and had a very narrow oil *** a high rock maturity and a high original TOC(TOCo)value exceeding 1%,nearly 80%of the generated hydrocarbons were *** content of gammacerane and C2. steranes in the oil and source rock extracts were relatively lean,with a V-shaped distribution of regular steranes,suggesting a possible genetic relation between the low-TOC_(pd) source rocks and the marine oil in the Tabei *** planktonic algae or acritarchs were the main hydrocarbon parent materials,distributed in the subsiding platform-slope *** matter was preserved under reducing conditions,and source rocks were formed with a favorable kerogen type and a moderate hydrocarbon generation *** study illustrates the hydrocarbon expulsion of low TOC_(pd) source rocks in northern Tarim Basin,which is greatly significant for analyzing the genesis of marine crude oil in Tarim Basin,and evaluating the distribution of marine source *** research method is theoretically significant for oil and gas exploration in the same type of highlymature carbonate paleobasins.

关键词： Carbonate source rock Mass balance approach Present-day TOC Genesis mechanism Tarim Basin

MORPHOLOGICAL CHARACTERIZATION OF POLY (N-VINYLCARBAZOLE) OBTAINED WITH ASYMMETRICALLY STEREOSELECTIVE POLYMERIZATION

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chinese Journal of Polymer Science 1999年第2期17卷 159-163页

作者： Quan Su Chuan-fu chen Yong-ming chen fu Xi PCLCC, institute of Chemistry, chinese Academy of sciences. Beijing 100080, china 中科院化学所高分子化学联合开放实验室北京 100080 中科院化学所高分子化学联合开放实验室北京

The morphological characterizations of poly(N-vinylcarbazole)(PVCZ) obtained by asymmetrically stereoselective polymerization were studied using x-ray diffraction pattern, DSC and GPC. The results show that the PVCZs have lower crystallinities (11.0 similar to 18.6%) and lower melting heats (2.2.similar to 7.5 J/g), but the degree of crystallinities of the PVCZ samples obtained using the organic salts (acid) with chiral or stereodifferentiating ligands are higher than that using radical and general protonic initiator. It has shown that the crystallization is directly related to the packing density of the hexagonal array of the rodlike molecules formed from the helical chain.

关键词： crystal optically active poly(N-vinylcarbazole)

Supramolecular Manipulation of Intracellular Acidic Vesicles to Improve Cellular Self-Repair and Self-Defense

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CCS Chemistry 2024年第6期6卷 1487-1498页

作者： Ziyi Wang chen Sun Yu Dong Yuan-fu Ding chen Zhao Ian Wa Ho Jiahong Lu Ruibing Wang State Key Laboratory of Quality Research in chinese Medicine Institute of Chinese Medical SciencesUniversity of MacaoTaipaMacao 999078China

Lysosomes are the“cell stomach”that digests various species including macromolecules and pathogens for self-repair and self-defense upon fusion with endosomes,autophagosomes,and ***,artificially manipulating intracellular vesicles could potentially promote lysosome-mediated intracellular digestion for disease prevention and ***,a supramolecular strategy to efficiently tether and fuse acidic vesicles(i.e.,lysosomes,late endosomes,autolysosomes,and phagosomes)has been developed for the first time to enhance the digestion of cellular wastes and foreign matter,including pathogens.A linear polyethylene glycol(PEG)derivative dually tagged with morpholine(MOR)and adamantane(ADA)on the opposite side,namely,MOR-PEG-ADA,was designed to target intracellular acidic vesicles via MOR and to decorate their surfaces with ***,the addition of cucurbit[7]uril(CB[7])grafted hyaluronic acid(HA)induced supramolecular tethering and fusion of acidic vesicles via strong host-guest interactions between CB[7]of CB[7]-HA and ADA residing on the surface of acidic *** a proof-ofconcept,the overall cellular metabolism,including endogenous autophagy and the exogenous endocytosis and phagocytosis,was effectively upregulated,demonstrating that supramolecular regulation of the dynamics of intracellular acidic vesicles may promote the lysosome’s digestion to significantly improve cellular self-repair and self-defense.

关键词： supramolecular chemistry organelle regulation intracellular acidic vesicles lysosomes selfdefense self-repair

Dendrobium officinale polysaccharide attenuates type 2.diabetes in mice model by modulating gut microbiota and alleviating intestinal mucosal barrier damage

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Food Science and Human Wellness 2024年

作者： Xiaoxia chen Chun chen Changyang Ma Wenyi Kang Junlin Wu Xiong {2. Guangzhou Wondfo Health Science and Technology Co.， Ltd. National R&D Center for Edible fungus Processing Technology， Henan University Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety Guangzhou institute of Modern Industrial Technology 4. Overseas Expertise Introduction Center for Discipline Innovation of Food Nutrition and Human Health (111 Center) SCUT-Zhuhai institute of Modern Industrial Innovation， School of Food Science and Engineering， South china University of Technology

The purpose of this study was to investigate the hypoglycemic effect and mechanism of Dendrobium officinale polysaccharide (DOP) on type 2.diabetes mellitus (T2.M) mice established by high-fat diet and streptozotocin. The results showed that DOP improved glycolipid metabolism and serum inflammation levels， and inhibited intestinal-derived lipopolysaccharide (LPS) translocation， suggesting that inhibiting LPS-mediated intestinal barrier damage may be a key target for DOP to alleviate T2.M. Interestingly， the study found that DOP reduced intestinal inflammation and oxidative stress levels， significantly up-regulated the mRNA expression of tight junction proteins Claudin-1， Occludin and Zonula occluden-1 (ZO-1)， and ameliorated intestinal epithelial damage. In addition， DOP strongly inhibited the intestinal pathogenic bacteria and LPS-producing bacteria Helicobacter， Enterococcus and Desulfovibrio with a reduction rate of 95%， 73% and 9%， respectively， and promoted the proliferation of anti-inflammatory bacteria Bifidobacterium and Lactobacillus by 139% and 8%， respectively. Taken together， the hypoglycemic effect of DOP was related to the protection of intestinal mucosal barrier， and its underlying mechanism lied in its excellent anti-inflammatory and gut microbiota-modulatory effects， providing a theoretical basis for developing DOP as a novel prebiotic in functional food for diabetes.

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Gas diffusion in catalyst layer of flow cell for CO_(2. electroreduction toward C_(2.) products

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Nano Research 2024年第3期17卷 1101-1106页

作者： Xiqing Wang Qin chen Yajiao Zhou Yao Tan Ye Wang Hongmei Li Yu chen Mahmoud Sayed Ramadan A.Geioushy Nageh K.Allam Junwei {2. Yifei Sun Min Liu Hunan Joint International Research Center for Carbon Dioxide Resource Utilization School of Physics and ElectronicsCentral South UniversityChangsha 410083China School of Energy and Power Engineering Beihang UniversityBeijing 100191China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450002China Central Metallurgical Research and Development institute(CMRDI) P.O.Box 87Helwan 11421CairoEgypt Energy Materials Laboratory School of Sciences and EngineeringThe American University in CairoNew Cairo 11835Egypt Research Center for Advanced Energy and Carbon Neutrality Beihang UniversityBeijing 100191China

The use of gas diffusion electrode(GDE)based flow cell can realize industrial-scale CO_(2. reduction reactions(CO_(2.RRs).Controlling local CO_(2. and CO intermediate diffusion plays a key role in CO_(2.RR toward multi-carbon(C_(2.))*** this work,local CO_(2. and CO intermediate diffusion through the catalyst layer(CL)was investigated for improving CO_(2.RR toward C_(2.)*** gas permeability tests and finite element simulation results indicated CL can balance the CO_(2. gas diffusion and residence time of the CO intermediate,leading to a sufficient CO concentration with a suitable CO_(2./H_(2.O supply for high C_(2.)*** a result,an excellent selectivity of C_(2.)products~79%at a high current density of 400 mA·cm^(-2. could be obtained on the optimal 500 nm Cu CL(Cu500).This work provides a new insight into the optimization of CO_(2./H_(2.O supply and local CO concentration by controlling CL for C_(2.)products in CO_(2.RR flow cell.

关键词： gas diffusion electrode CO_(2.reduction Cu mass transfer C_(2.product