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Explore the nucleolus: unveiling the hidden layer with superresolution microscopy

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中国科学:生命科学英文版 2023年第9期66卷 2193-2195页

作者： rongfei wei Xinyu Wang Dong Li National Laboratory of Biomacromolecules CAS Center for Excellence in BiomacromoleculesInstitute of BiophysicsChinese Academy of SciencesBeijing 100101China College of Life Sciences University of Chinese Academy of SciencesBeijing 100049China

The nucleolus, a well-known membraneless organelle and the largest substructure with the highest transcriptional activity in the nucleus, was discovered over 200 years ago and is best known for its critical role in ribosome biogenesis(Kresoja-Rakic and Santoro, 2019;Navarro, 2019). Previous studies have reported that the nucleolus comprises three radially distributed layers known as the fibrillar center (FC).

关键词： transcriptional organelle resolution

Isotopic Geochemistry of Cadmium:A Review

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Acta Geologica Sinica(English Edition) 2015年第6期89卷 2048-2057页

作者： ZHU Chuanwei WEN Hanjie ZHANG Yuxu LIU Yizhang wei rongfei State Key Laboratory of Ore Deposit Geochemistry Institute of GeochemistryChinese Academy of Sciences State Key Laboratory of Environmental Geochemistry Institute of GeochemistryChinese Academy of Sciences Center for Environment Remediation Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of Sciences

Cadmium（Cd） is a scarce, but not an extremely rare element in the Earth＇s crust（crustal average： 0.2 ppm Cd）. Geochemically, Cd exhibits thiophile, lithophile, and volatile behavior in different geologic processes. Biologically, it is a nutrient-like element that is closely related to P and Zn and is toxic element to organisms. Presently, Cd isotopes have been successfully utilized to trace Cd sources and nutrient cycling in marine systems in addition to unearthing other geochemical processes. Using published studies and our recent work, this survey summarizes the chemical preparation and mass spectrometry of Cd isotopes. It also reviews Cd isotopic compositions and fractionation mechanisms in nature as well as experiments.

关键词： Cadmium non-traditional stable isotopes stable isotopic fractionation geochemical tracer

Blue–green color-tunable emissions in novel transparent Sr2LuF7:Eu/Tb glass-ceramics for WLEDs

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Chinese Optics Letters 2020年第5期18卷 44-49页

作者： Xiaoman Li Shaoshuai Zhou rongfei wei Xueyun Liu Bingqiang Cao Hai Guo School of Physics and Physical Engineering Shandong Provincial Key Laboratory of Laser Polarization and Information TechnologyQufu Normal UniversityQufu 273165China State Key Laboratory of Luminescent Materials and Devices South China University of TechnologyGuangzhou 510640China Department of Physics Zhejiang Normal UniversityJinhua 321004China Laboratory of Infrared Materials and Devices Advanced Technology Research InstituteNingbo UniversityNingbo 315211China

To introduce ordered nano-structures inside a transparent amorphous matrix with superior optical and mechanical properties bears scientific and technological importance,yet limited success has been ***,via simple melting-quenching and subsequent thermal activation,we report the successful preparation of transparent nano-structured glass-ceramics embedded in Sr2Lu F7 nano-crystals(~26 nm),as evidenced by X-ray diffraction,transmission electron microscopy(TEM),and high resolution *** successful incorporation of dopants into formed Sr2Lu F7 nano-crystals with low phonon energy results in highly tunable blue–green photoemission,which depends on excitation wavelength,dopant type,and *** found that Eu3+and Eu2+ions co-exist in this hybrid optical material,accompanied by the broadband blue emission of Eu2+and sharp red emissions of Eu3+.A series of optical characterizations are summoned,including emission/excitation spectrum and decay curve measurement,to reveal the reduction mechanism of Eu3+to Eu2+.Furthermore,near green–white photoemission is achieved via the enrichment of Tb3+/Eu3+into crystallized Sr2Lu F7 *** temperature-dependent visible photoemission reveals thermal activation energy increases with the precipitation of Sr2Lu F7 nano-crystals in a glass matrix,suggesting better thermal stability of glass-ceramics than precursor *** results could not only deepen the understanding of glass-ceramics but also indicate the promising potential of Eu3+/Tb3+-ions-doped Sr2Lu F7 glass-ceramics for UV pumped white light emitting diodes(WLEDs)with good thermal stability.

关键词： glass-ceramics:Sr2LuF7nano-crystals WLED:luminescent materials

Washing out heavy metals from contaminated soils from an iron and steel smelting site

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Frontiers of Environmental Science & Engineering 2015年第4期9卷 634-641页

作者： Guangxu ZHU Qingjun GUO Junxing YANG Hanzhi ZHANG rongfei wei Chunyu WANG Marc PETERS Xiaoyong ZHOU Jun YANG Center for Environmental Remediation Institute of Geographical Sciences and Natural Resources Chinese Academy of Sciences Beijing 100101 China University of Chinese Academy of Sciences Beijing 100049 China

Washing is a promising method for separating contaminants bound to the particles of soil ex-situ by chemical mobilization. Laboratory batch washing experi- ments were conducted using deionized water and varying concentrations of oxalic acid, citric acid, tartaric acid, acetic acid, hydrochloric acid and ethylenediaminetetra acetic acid （EDTA） to assess the efficiency of using these chemicals as washing agents and to clean up heavy metals from two heavily polluted soils from an iron and streel smelting site. The toxicity reduction index and remediation costs were analyzed, and the results showed that the soils were polluted with Cd, Pb and Zn. Hydrochloric acid and EDTA were more efficient than the other washing agents in the remediation of the test soils. The maximum total toxicity reduction index showed that 0.5 mol·L^-1 hydro- chloric acid could achieve the remediation with the lowest costs.

关键词： heavy metals soil washing toxicity reduction index iron and steel smelting site

Chalcogen-dependent catalytic properties of RuX2 (X = S/Se/Te) nanoparticles decorated carbon nanofibers for hydrogen evolution in acidic and alkaline media

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Nano Research 2024年第4期17卷 2528-2537页

作者： Chengkai He Yue wei Jia Xu Yujie wei Tao Wang rongfei Liu Lvlv Ji Zhun Liu Sheng Wang School of Materials Science and Engineering Zhejiang Sci-Tech UniversityHangzhou 310018China Department of Physics Shaoxing UniversityShaoxing 312000China Zhejiang Kangjiesi New Material Technology Co. LTDZhuji 311800China

Transition metal dichalcogenides(TMDs),with the general formula MX_(2)(M=Mo/W/Fe/Co/Ni,etc.;X=S/Se/Te),have attracted extensive research interests for hydrogen evolution reaction(HER).Compared with numerous studies on noble-metal-free TMDs,the chalcogen-dependent HER catalytic properties of noble-metal-based TMDs are lack of sufficient research ***,a facile electrospinning-assisted synthetic strategy is proposed to synthesize ruthenium dichalcogenides(RuX_(2),X=S/Se/Te)nanoparticles decorated carbon nanofibers(CNFs).Benefiting from the identical nanofibrous morphology and exposed crystal planes of RuX_(2)(111),the catalytic activities of RuX_(2)@CNFs samples were investigated and compared in a fair and direct *** electrochemical measurements coupled with density functional theory calculations were carried out to probe their intrinsic HER catalytic activities,resulting in the catalytic activity order of RuS_(2)@CNFs>RuSe_(2)@CNFs>RuTe_(2)@CNFs in acidic media and that of RuS_(2)@CNFs>RuTe_(2)@CNFs>RuSe_(2)@CNFs in alkaline *** superior catalytic performance of RuS_(2)@CNFs mainly stems from the relative lower HER energy barriers and thereby the higher intrinsic catalytic activity of RuS_(2)(111),leading to ultralow overpotentials of 44 and 9 mV at 10 mA·cm^(-2) in acidic and alkaline media,***_(2)(111)is endowed with the more optimized Gibbs free energy of hydrogen adsorption(ΔGH*)than RuTe_(2)(111),but RuTe_(2)(111)shows enhanced catalytic property for H_(2)O dissociation and OH-desorption than RuSe_(2)(111),therefore,resulting in the altered catalytic activity sequences for RuSe_(2) and RuTe_(2) in acidic and alkaline media.

关键词： hydrogen evolution reaction transition metal dichalcogenides carbon nanofibers electrocatalysis catalytic activity

Cadmium accumulation and tolerance of two castor cultivars in relation to antioxidant systems

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Journal of Environmental Sciences 2014年第10期26卷 2048-2055页

作者： Hanzhi Zhang Qingjun Guo Junxing Yang Tongbin Chen Guangxu Zhu Marc Peters rongfei wei Liyan Tian Chunyu Wang Deyun Tan Jie Ma Gangming Wang Yingxin Wan Center for Environmental Remediation Institute of Geographical Sciences and Natural Resources Chinese Academy of Sciences University of Chinese Academy of Sciences Zibo Academy of Agricultural Sciences China University of Geosciences College of Applied Arts and Science of Beijing Union University

To investigate the effects of Cd on tolerance and antioxidant activities of castor, two different castor（Ricinus communis L.） cultivars（Zibo No. 5 and Zibo No. 8） were used for a hydroponic experiment（0, 1 and 2 mg/L Cd） and a pot experiment using Cd-contaminated soil（34 mg/kg） with the addition of ethylenedinitrilotetraacetic acid（EDTA）. The results indicated that there were significant differences between the two cultivars with respect to Cd uptake in shoots（113–248 mg/kg for Zibo No. 5 and 130–288 mg/kg Zibo No. 8）, biomass tolerance indexes（64.9%–74.6% for Zibo No. 5 and 80.1%–90.9% for Zibo No. 8） in the hydroponic experiment and survival rates（0% for Zibo No. 5 and 100% for Zibo No. 8）determined by the addition of EDTA in the pot experiment, suggesting that Zibo No. 8 has higher tolerance than Zibo No. 5. Moreover, the castor cultivars have low bioconcentration factors（4.80% for Zibo No. 5 and 5.43% for Zibo No. 8） and low translocation factors（〈1%）.Consequently, Zibo No. 8 can participate in Cd phytostabilization in highly Cd-polluted areas. The results indicated that glutathione（GSH） as a non-enzymatic antioxidant, and antioxidant enzymes including superoxide dismutase（SOD）, catalase（CAT） and guaiacol peroxidase（GPX）, were cultivar- and dose-dependent. The higher tolerance of Zibo No. 8compared with Zibo No. 5 can be attributed to the higher GSH levels in the root and higher GPX activity in the leaf.

关键词： Cadmium Castor Antioxidant activity Tolerance Phytoremediation

Antimonene:a long-term stable two-dimensional saturable absorption material under ambient conditions for the mid-infrared spectral region

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Photonics Research 2018年第9期6卷 900-907页

作者： HONGYU Luo XIANGLING TIAN YING GAO rongfei wei JIANFENG LI JIANRONG QIU YONG LlU State Key Laboratory of Electronic Thin Films and Integrated Devices School of Optoelectronic Science and EngineeringUniversity of Electronic Science and Technology of China(UESTC)Chengdu 610054China State Key Laboratory of Luminescent Materials and Devices and School of Materials Science and Engineering South China University of TechnologyGuangzhou 510641China Department of Physics Zhejiang Normal UniversityJinhua 321004China State Key Laboratory of Modern Optical Instrumentation College of Materials Science and EngineeringZhejiang University Hangzhou 310027China

We experimentally demonstrate a long-term stable two-dimensional saturable absorption material under ambient conditions—multi-layer antimonene feasible for the mid-infrared spectral region—for the first time to our knowledge. The multi-layer antimonene material prepared using a liquid-phase exfoliation method was coated on a quartz/Ca F_2 for characterizations and an Au mirror as a reflection-type saturable absorber(SA) device. It has a modulation depth of 10.5%, a saturation peak intensity of 0.26 GW∕cm^2, and a non-saturation loss of 19.1% measured at 2868.0 nm using the typical power-dependent method. By introducing the SA device into a linear-cavity Ho^(3+)∕ Pr^(3+)-codoped fluoride fiber laser at 2865.0 nm, stable Q-switched pulses were obtained. It generated a maximum output power of 112.3 m W and pulse energy of 0.72 μJ, while the shortest pulse duration and largest repetition rate were 1.74 μs and 156.2 k Hz, respectively. The long-term stability of the SA device was also checked using the same laser setup within 28 days. The results indicate that multi-layer antimonene is a type of promising long-term stable SA material under ambient conditions that can be applied in the mid-infrared spectral region.

关键词：二维饱和吸收材料红外光谱发展现状通讯技术

The nuclear cytokine IL-37a controls lethal cytokine storms primarily via IL-1R8-independent transcriptional upregulation of PPARγ

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Cellular & Molecular Immunology 2023年第12期20卷 1428-1444页

作者： rongfei wei Xiao Han Mengyuan Li Yuan Ji Lianfeng Zhang Maria-Ioanna Christodoulou Najwa Jameel Hameed Aga Caiyan Zhang Ran Gao Jiangning Liu Jinrong Fu Guoping Lu Xiaojun Xiao Xiaoyu Liu Ping-Chang Yang Iain B.McInnes Ying Sun Peisong Gao Chuan Qin Shau-Ku Huang Yufeng Zhou Damo Xu Institute of Laboratory Animal Science Chinese Academy of Medical Science(CAMS)and Comparative Medicine CenterPeking Union Medical College(PUMC)BeijingChina National Laboratory of Biomacromolecules CAS Center for Excellence in Biom––acromoleculesInstitute of BiophysicsChinese Academy of SciencesBeijing100101China NHC Key Laboratory of Neonatal Diseases Children’s Hospital of Fudan Universityand the Shanghai Key Laboratory of Medical EpigeneticsInternational Co-laboratory of Medical Epigenetics and MetabolismMinistry of Science and TechnologyInstitutes of Biomedical SciencesFudan UniversityShanghai200032China Department of General Practice Medicine Third Affiliated Hospital of Shenzhen UniversityShenzhenChina Institute of Infection Immunity and InflammationUniversity of GlasgowGlasgowUK Tumor Immunology and Biomarkers Laboratory Basic and Translational Cancer Research CenterDepartment of Life SciencesSchool of SciencesEuropean University CyprusNicosia2404Cyprus Department of Critical Care Medicine Children’s Hospital of Fudan UniversityShanghaiChina Institute of Allergy and Immunology Health Science CenterShenzhen UniversityShenzhenChina Department of Immunology School of Basic Medical ScienceCapital Medical UniversityBeijingChina Department of Medicine Johns Hopkins University School of MedicineBaltimoreMDUSA National Institute of Environmental Health Sciences National Health Research InstitutesTaiwanChina State-level Regional Children’s Medical Center Children’s Hospital of Fudan University at Xiamen(Xiamen Children’s Hospital)Fujian Provincial Key Laboratory of Neonatal DiseasesXiamenChina

Cytokine storms are crucial in the development of various inflammatory diseases,including sepsis and autoimmune *** immunosuppressive cytokine INTERLEUKIN(IL)-37 consists of five isoforms(IL-37a-e).We identified IL-37a as a nuclear cytokine for the first *** to IL-37b,IL-37a demonstrated greater efficacy in protecting against Toll-like receptor-induced cytokine hypersecretion and lethal endotoxic *** full-length(FL)form of IL-37a and the N-terminal fragment,which is processed by elastase,could translocate into cell nuclei through a distinctive nuclear localization sequence(NLS)/importin nuclear transport *** forms exerted their regulatory effects independent of the IL-1R8 receptor by transcriptionally upregulating the nuclear receptor peroxisome proliferator-activated receptor(PPARγ).This process involved the recruitment of the H3K4 methyltransferase complex WDR5/MLL4/C/EBPβand H3K4me1/2 to the enhancer/promoter of *** receptor-independent regulatory pathway of the nuclear IL-37a–PPARγaxis and receptor-dependent signaling by secreted IL-37a maintain homeostasis and are potential therapeutic targets for various inflammatory diseases,including sepsis.

关键词： IL-37 isoforms IL-37a Nuclear cytokine receptor-independent

2D材料和准2D材料的非线性光学特性及应用

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中国激光 2017年第7期44卷 19-39页

作者：马志军魏荣妃胡忠亮邱建荣华南理工大学发光材料与器件国家重点实验室广东广州510640 光纤激光材料和应用广东省重点实验室广东广州510640 浙江大学光电系浙江杭州310027

二维(2D)材料具有独特的结构和光电特性,在能源、环境、高性能光电传感等方面都有非常重要的应用。2D材料的非线性光学特性及应用是研究者广泛关注的热点研究领域。从2D材料的制备方法、晶体和能带结构、非线性光学特性研究等方面对2D... 详细信息

二维(2D)材料具有独特的结构和光电特性,在能源、环境、高性能光电传感等方面都有非常重要的应用。2D材料的非线性光学特性及应用是研究者广泛关注的热点研究领域。从2D材料的制备方法、晶体和能带结构、非线性光学特性研究等方面对2D材料的研究进行了简单回顾。非线性纳米晶自组装或复合薄膜是另一类重要的非线性材料。考虑到这类材料的宏观2D特性和论述内容的连贯性,将非线性纳米晶自组装或复合薄膜归于准2D材料,并对其非线性光学特性和应用等也进行了简单介绍,作为对非线性光学材料研究的补充。

关键词：材料 2D材料激光锁模调Q