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Ligand-Free Synthesis of 1,4-Disubstituted-l,3-diynes by Iron/Copper Cocatalyzed Homocoupling of Terminal Alkynes

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Chinese Journal of Chemistry 2013年第2期31卷 187-194页

作者： peipei wang Xiaoyan Liu Songlin Zhang Key Laboratory of Organic Synthesis of Jiangsu Province College of Chemistry Chemical Engineering and Materials Science of Soochow University Suzhou Jiangsu 215123 China

A simple and efficient protocol for Fe/Cu cocatalyzed oxidative homocoupling reaction of terminal alkynes to symmetrical 1,4-disubstituted-l,3-diynes was presented. The results showed that both CuBr and FeC13 played erucial roles in the reaction. It is noteworthy that this protocol employs mild, efficient, aerobic and ligand free conditions. The alkynes, including aromatic, heteroaromatic and aliphatic alkynes, were transformed into the corresponding 1,3-diynes in good to excellent yields.

关键词： catalysis copper iron 1,3-diyne ligand-free

Fast degradation of azo dye by nanocrystallized Fe-based alloys

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Science China(Physics,Mechanics & Astronomy) 2017年第7期60卷 76-80页

作者： peipei wang JunQiang wang JunTao Huo Wei Xu XinMin wang Gang wang School of Materials Science and Engineering Shanghai University CAS Key Laboratory of Magnetic Materials and Devices & Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology Ningbo Institute of Materials Technology & Engineering Chinese Academy of Sciences

Exploring new alloys with high efficiency in degrading organic pollutants in aqueous solutions is of wide interests. Here, we report that the nanocrystallized Fe82.65Si4B12Cu1.35 alloy exhibits higher efficiency in decolorizing azo dye solutions compared to its amorphous counterpart. The increased efficiency is attributed to the formation of numerous microbatteries between the α-Fe（Si） and Fe2B nanocrystalline phases, which exhibit different corrosion potentials. These results suggest that nanocrystallized Fe-based amorphous composites hold promising apolication potential in degrading azo dyes solutions.

关键词： nanocrystalline alloys amorphous alloys degradation of azo dye

RNase P:Beyond Precursor tRNA Processing

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Genomics, Proteomics & Bioinformatics 2024年第1期22卷 19-28页

作者： peipei wang Juntao Lin Xiangyang Zheng Xingzhi Xu Guangdong Key Laboratory for Genome Stability&Disease Prevention and Marshall Laboratory of Biomedical Engineering Shenzhen University Medical SchoolShenzhen UniversityShenzhen 518060China Department of Urology The First Affiliated HospitalZhejiang University School of MedicineHangzhou 310000China Shenzhen University General Hospital-Dehua Hospital Joint Research Center on Precision Medicine Dehua HospitalDehua 362500China

Ribonuclease P(RNase P)was first described in the 1970’s as an endoribonuclease acting in the maturation of precursor transfer RNAs(tRNAs).More recent studies,however,have uncovered non-canonical roles for RNase P and its ***,we review the recent progress of its involvement in chromatin assembly,DNA damage response,and maintenance of genome stability with implications in *** possibility of RNase P as a therapeutic target in cancer is also discussed.

关键词： RNase P Chromatin assembly DNA damage response Genome stability Tumorigenesis

A review on completing arsenic biogeochemical cycle: Microbial volatilization of arsines in environment

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Journal of Environmental Sciences 2014年第2期26卷 371-381页

作者： peipei wang Guoxin Sun Yan Jia Andrew A Meharg Yongguan Zhu State Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Institute for Global Food Security Queen’s University Belfast David Keir Building Stranmillis Road Belfast BT9 5AG UK Key Lab of Urban Environment and Health Institute of Urban Environment Chinese Academy of Sciences

Arsenic （As） is ubiquitous in the environment in the carcinogenic inorganic forms, posing risks to human health in many parts of the world. Many microorganisms have evolved a series of mechanisms to cope with inorganic arsenic in their growth media such as transforming As compounds into volatile derivatives. Bio-volatilization of As has been suggested to play an important role in global As biogeochemical cycling, and can also be explored as a potential method for arsenic bioremediation. This review aims to provide an overview of the quality and quantity of As volatilization by fungi, bacteria, microalga and protozoans. Arsenic bio-volatilization is influenced by both biotic and abiotic factors that can be manipulated/elucidated for the purpose of As bioremediation. Since As bio- volatilization is a resurgent topic for both biogeochemistry and environmental health, our review serves as a concept paper for future research directions.

关键词： arsenic methylation microorganism volatilization

Construction of multi-structures based on Cu NWs-supported MOF-derived Co oxides for asymmetric pseudocapacitors

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Journal of Materials Science & Technology 2021年第6期65卷 182-189页

作者： Ruimei Yuan Hejun Li Xuemin Yin peipei wang Jinhua Lu Leilei Zhang State Key Laboratory of Solidification Processing Carbon/Carbon Composites Research CenterNorthwestern Polytechnical UniversityXi'an 710072China

Cu@MOF core-shell nanowires are synthesized by introducing oxidizable and CTAB-modified metal nanowires as self-engaged templates and supporting MOFs for a one-dimension *** following thermal process is controlled to obtain several one-dimension structure s ofCuCo-mixed materials,such as nanorods,single-shell and double-shell *** hollow structure for electrode materials enlarges the surface area,provides buffer space for electrolyte to accelerate the ion/charge transfers and for the structure to reduce injuries of volume expansion during *** with some other merits,such as adequate oxidation of the MOFs,small crystal grains of the material,and well-mixed Cu/Co oxides,the double-shell Cu@MOF nanowires(CuCo-DS5)applied for pseudocapacitors deliver advanced electrochemical performance with a specific capacitance of 563.8 F g^(-1)at 1 A g^(-1)as well as an outstanding cycling stability with a 92%retention after 3000 cycles at 5 A g^(-1).Meanwhile,an asymmetric pseudocapacitor constructed with the CuCo-DS5 and active carbon(AC)shows a high specific capacitance and energy density.

关键词： Modified nanowires MOF-derived Hollow Core-shell Double-shell Energy storage

Numerical analysis of seepage flow characteristic of collapse column under the influence of mining

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International Journal of Mining Science and Technology 2013年第2期23卷 243-250页

作者： Ou Subei wang Lianguo wang peipei wang Zhansheng Huang Jihui Zhou Donglei State Key Laboratory of Deep Geomechanics and Underground Engineering China University of Mining & Technology School of Mechanics and Building Engineering China University of Mining & Technology School of Physics Peking University

Based on the importance of fractured rock mass seepage research, in order to analyze seepage flow characteristics of collapse column under the influence of mining, a method by embedding fractured rock mass flow solid coupling relationship into FLAC3D internal flow models is presented according to fluid-solid coupling theory and strength criterion. A calculation model of numerical analysis was established, and the influences of mining pressure and plastic damage to pore water pressure and seepage vector change rule were studied. The results show that collapse column is the main channel of confined water seepage upward. The impact is not big when the workface is away from the collapse column. But when the workface is nearing a collapse column, there will be a seepage channel on a side near the workface, in which seepage vector and head are comparatively large. With workface pushing through collapse column, the seepage channel transfers to the other side of the column. In addition, when the plastic damage area within the collapse column breaks through, a "pipeline flow" will be formed within the column, and seepage field will change remarkably and the possibility of water bursting will be greater.

关键词： Collapse column Fractured rock mass Fluid-solid coupling Seepage characteristic Seepage channel

Multi-carrier transport in ZrTe_5 film

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Chinese Physics B 2018年第8期27卷 498-504页

作者： Fangdong Tang peipei wang Peng wang Yuan Gan Le wang Wei Zhang Liyuan Zhang Department of＇Physics and Beijing Key Laboratory of Optoelectronic Functional Natual Materials ＆ Micro-nano Devices Renmin University of China Beijing 100872China Department of Physics Southern University of Science and TechnologyShenzhen 518055China

Single-layered zirconium pentatelluride （ZrTes） has been predicted to be a large-gap two-dimensional （2D） topolog- ical insulator, which has attracted particular attention in topological phase transitions and potential device applications. Herein, we investigated the transport properties in ZrTe5 films as a function of thickness, ranging from a few nm to several hundred nm. We determined that the temperature of the resistivity anomaly peak （Tp） tends to increase as the thickness decreases. Moreover, at a critical thickness of ~ 40 rim, the dominating carriers in the films change from n-type to p-type. A comprehensive investigation of Shubnikov-de Hass （SdH） oscillations and Hall resistance at variable temperatures revealed a multi-carrier transport tendency in the thin films. We determined the carrier densities and mobilities of two majority car- riers using the simplified two-carrier model. The electron carriers can be attributed to the Dirac band with a non-trivial Berry phase ~, while the hole carriers may originate from surface chemical reaction or unintentional doping during the microfabrication process. It is necessary to encapsulate the ZrTe5 film in an inert or vacuum environment to potentially achieve a substantial improvement in device quality.

关键词： multi-carrier transport ZrTe5 film thickness-dependence, gate-dependence

Effects of platelets on characteristics of lymphocytes cultured in vitro and optimization of adoptive immunotherapy

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BIOCELL 2023年第12期47卷 2661-2669页

作者： CONGLIANG CHEN XIAOHONG LENG YU ZHANG JUNMEI HU DAPENG WEI peipei wang XIA wang West China School of Basic Medical Sciences and Forensic Medicine Department of ImmunologySichuan UniversityChengduChina

T lymphocytes,the main participants of cellular immunity,can express a variety of surface molecules and form different lymphocyte subsets under the induction of different factors to play the functions of immune regulation and immune *** have shown that platelets play a crucial role in maintaining the stable differentiation of lymphocytes and the balance in ***,it is necessary to study the effect of platelets on lymphocytes in vitro to better understand the role of platelets in the immune system and broaden the application of adoptive ***:Cell counting and microscopic observation were used to detect the effect of activated platelets on lymphocyte proliferation in vitro;Flow cytometry was used to detect whether changes in platelet activity affect the proportion of lymphocyte subpopulations in vitro,and to detect differences in the expression of granzyme B;lactate dehydrogenase assay(LDH)was used to determine the difference in lymphocyte killing activity caused by platelet activity in ***:This was the first to promote lymphocyte proliferation through the expression or release of certain molecules in vitro,demonstrating that platelet activation is one of the key ***,activated platelets or inactivated platelets promoted lymphocyte subset differentiation by enhancing the proportion of CD3+CD8+T lymphocytes(CTL cells)but had a slight effect on the proportion of CD3+CD4+T(Th cells)and CD4+CD25+T lymphocytes(Treg cells).Then,it was found that either activated platelets or inactivated platelets down-regulated the proportion of natural killer(NK)T lymphocytes,while activated platelets significantly enhance the proportion of NK ***,by further detecting the killing activity of PBMCs treated with platelets,it was found that activated platelets promoted the extensive anti-tumor activity of lymphocytes and significantly increased the expression of granzyme ***:Our results suggest

关键词： Platelets Lymphocyte Adoptive immunotherapy

Investigation of condition-induced bubble size and distribution in electroflotation using a high-speed camera

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International Journal of Mining Science and Technology 2014年第1期24卷 7-12页

作者： Ren Liuyi Zhang Yimin Qin Wenqing Bao Shenxu wang peipei Yang Congren College of Resources and Environment Engineering Wuhan University of Technology School of Minerals Processing and Bioengineering Central South University

In the flotation process, bubble is a key factor in studying bubble-particle interaction and fine particle flo- tation. Knowledge on size distribution of bubbles in a flotation system is highly important. In this study, bubble distributions in different reagent concentrations, electrolyte concentrations, cathode apertures, and current densities in electroflotation are determined using a high-speed camera. Average bubble sizes under different conditions are calculated using Image-Pro@ Plus （Media Cybernetics@, MD, USA） and SigmaScan@ Pro （Systat Software, CA, USA） software. Results indicate that the average sizes of bubbles, which were generated through 38, 50, 74, 150, 250, 420, and 1000 μm cathode apertures, are 20.2, 29.5, 44.6, 59.2, 68.7, 78.5, and 88.8 μm, respectively. The optimal current density in electroflotation is 20 A/m2. Reagent and electrolyte concentrations, current density, and cathode aperture are important factors in controlling bubble size and nucleation. These factors also contribute to the control of fine- Particle flotation.

关键词： High-speed camera Bubble Electroflotation Fine particle Bubble production and control