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Unraveling the stabilization mechanism of solid electrolyte interface on ZnSe by rGO in sodium ion battery

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Journal of Energy Chemistry 2021年第3期30卷 124-130页

作者： Shuang Men Hui Zheng dejun ma Xiaolian Huang Xiongwu Kang School of Environment and Energy South China University of TechnologyGuangzhou 510006GuangdongChina Department of Chemical Engineering Northwest UniversityXi'an 710069ShaanxiChina School ofPhamacy Guangdong Pharmaceutical UniversityGuangzhou 510006GuangdongChina College of Chemistry and Chemical Engineering Guangzhou UniversityGuangzhou 510006GuangdongChina

Transition metal selenides have been widely studied as anode materials of sodium ion batteries(SIBs),however,the investigation of solid-electrolyte-interface(SEI)on these materials,which is critical to the electrochemical performance of SIBs,remains at its infancy.Here in this paper,ZnSe@C nanoparticles were prepared from ZIF-8 and the SEI layers on these electrodes with and without reduced graphene oxide(rGO)layers were examined in details by X-ray photoelectron spectroscopies at varied charged/discharged states.It is observed that fast and complicated electrolyte decomposition reactions on ZnSe@C leads to quite thick SEI film and intercalation of solvated sodium ions through such thick SEI film results in slow ion diffusion kinetics and unstable electrode structure.However,the presence of rGO could efficiently suppress the decomposition of electrolyte,thus thin and stable SEI film was formed.ZnSe@C electrodes wrapped by rGO demonstrates enhanced interfacial charge transfer kinetics and high electrochemical performance,a capacity retention of 96.4%,after 1000 cycles at 5 A/g.This study might offer a simple avenue for the designing high performance anode materials through manipulation of SEI film.

关键词： ZIF-8 Zinc selenide Transition metal selenide Reduced graphene oxide XPS Solid electrolyte interface Sodium ion batteries

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山东省羊产业现状、优势特点与建议

中国畜禽种业 2024年第4期20卷 195-200页

作者：晁天乐鞠林马德军纪志宾山东农业大学动物科技学院山东泰安271018 山东省德州市陵城区农业农村局山东德州253500

山东省是全国养羊大省,羊存栏量、出栏量及羊肉产量连续多年位列全国前五、农区前二。该文系统分析了山东省羊产业的发展现状,全面总结了山东省羊产业在品种资源、饲草料生产和产业化发展等方面存在的优势特点,指出了山东省羊产业在现... 详细信息

山东省是全国养羊大省,羊存栏量、出栏量及羊肉产量连续多年位列全国前五、农区前二。该文系统分析了山东省羊产业的发展现状,全面总结了山东省羊产业在品种资源、饲草料生产和产业化发展等方面存在的优势特点,指出了山东省羊产业在现有品种利用、规模化生产技术配套、疫病防治和应对市场挑战等方面存在的问题,并对各个问题提出了针对性的对策和建议,以期为羊产业的健康、稳定和可持续发展提供参考。

关键词：羊产业良种培育规模化生产技术羊病防治开拓市场

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太子山保护区樟科木姜子分布调查浅析

甘肃科技 2024年第2期40卷 91-94页

作者：妥永华马得俊陈宏福郭鹏辉甘肃太子山国家级自然保护区管护中心甘肃康乐731505 西北民族大学生命科学与工程学院甘肃兰州730030

木姜子(Litsea pungens Hemsl.)具有平喘、镇痛、消炎等作用,是中国民间传统中药材,具有极高的经济、药用价值。但由于受木姜子特殊的生长环境及人工驯化技术的限制,目前人工种植较少,原料供应困难,因此,了解野生木姜子的分布特征及其... 详细信息

木姜子(Litsea pungens Hemsl.)具有平喘、镇痛、消炎等作用,是中国民间传统中药材,具有极高的经济、药用价值。但由于受木姜子特殊的生长环境及人工驯化技术的限制,目前人工种植较少,原料供应困难,因此,了解野生木姜子的分布特征及其生物学习性,可为木姜子资源的保护和利用奠定一定基础。文章以甘肃省太子山国家级自然保护区为调查区域,采用野外实地调查、文献查阅和走访调查等方法,对保护区内野生木姜子的分布特征、生长状况、生物学习性等进行了调查分析,并提出了合理的保护策略及开发利用建议。结果表明,保护区内木姜子树龄均在15年左右,生长状况良好;保护区内木姜子生长主要分布在海拔2400~2600 m的阳坡、半阳坡,呈零星分布;保护区内木姜子种群结构简单,受外界环境影响后极难恢复。文章可为木姜子野生资源的保护及其创新利用提供一定的理论依据。

关键词：木姜子生物特性保护价值

NUMERICAL SIMULATION FOR MEASURING YIELD STRENGTH OF THIN METAL FILM BY NANOINDENTATION METHOD

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中国有色金属学会会刊：英文版 1997年第3期7卷 66-69页

作者： ma, dejun Xu, Kewei He, Jiawen Xi'an Jiaotong Univ Xi'an China

ＮＵＭＥＲＩＣＡＬＳＩＭＵＬＡＴＩＯＮＦＯＲＭＥＡＳＵＲＩＮＧＹＩＥＬＤＳＴＲＥＮＧＴＨＯＦＴＨＩＮＭＥＴＡＬＦＩＬＭＢＹＮＡＮＯＩＮＤＥＮＴＡＴＩＯＮＭＥＴＨＯＤ①ＭａＤｅｊｕｎ，ＸｕＫｅｗｅｉ，ＨｅＪｉａｗｅｎＳ... 详细信息

ＮＵＭＥＲＩＣＡＬＳＩＭＵＬＡＴＩＯＮＦＯＲＭＥＡＳＵＲＩＮＧＹＩＥＬＤＳＴＲＥＮＧＴＨＯＦＴＨＩＮＭＥＴＡＬＦＩＬＭＢＹＮＡＮＯＩＮＤＥＮＴＡＴＩＯＮＭＥＴＨＯＤ①ＭａＤｅｊｕｎ，ＸｕＫｅｗｅｉ，ＨｅＪｉａｗｅｎＳｔａｔｅＫｅｙＬａｂｏｒａｔｏｒｙ...

关键词： nanoindentation method thin metal film mechanical properties finite element method

Efficient Construction of Gene Nanovector through PCR with flexible branched primers for gene delivery

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Efficient Construction of Gene Nanovector through PCR with f...

Design and synthesis of a novel siRNA with propargyl analogs at their 3'-overhang

第十届全国化学生物学学术会议

作者： Longhuai Cheng dejun ma Zhen Xi Department of Chemical Biology State Key Laboratory of Elemento-Organic ChemistryNational Engineering Research Center of Pesticide (Tianjin)Nankai University

Gene therapy is a promising strategy for the treatment of many gene related diseases. A safe and efficient gene delivery vector is always the first key step for the development of gene medicine. To date, gene delivery vectors mainly include two categories, viral vectors and non-viral vectors.1 The gene cargo involved in these non-viral vectors is almost always a traditional plasmid. As we know, plasmids are easy to construct and amplify through the classic protocol, however the numerous unmethylated CpG motifs and the obstinate bacterial remnants such as lipopolysaccharides(LPS) of the plasmid can induce an adverse immune response.2 In this work, through a pair of short DNA trimers(F and R) to work as the branched primers in the traditional PCR system,3 gene nanoparticles with target gene expression cassettes have been successfully constructed just in one step. The gene nanoparticles exhibited excellent target protein(p53) expression in cancer cell line Hela, and induced apoptosis of cancer cells efficiently. This construction strategy of the branch-PCR process makes it possible to fast and efficiently produce the stable gene nanovector, and can be potentially general to other target gene for gene therapy.

关键词： Gene therapy Branched primers Gene nanoparticle Gene delivery

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Design and synthesis of a novel siRNA with propargyl analogs...

VOC emitted by biopharmaceutical industries:Source profiles,health risks,and secondary pollution

第十一届全国化学生物学学术会议

作者： Chao Yang dejun ma Zhen Xi State Key Laboratory of Elemento-Organic Chemistry and National Engineering Research Center of Pesticide College of ChernishyNankai Uniyersity

RNAi-based therapy has emerged as a powerful strategy for treatment of various diseases including cancer. The small interfering RNAs(siRNAs) could trigger-the target mRNA of disease-causing genes to be degraded in a highly sequence-specific manner. Although remarkable advances have been achieved,siRNA-based therapeutics is still limited mainly due to several challenges including low efficiency,fragile stability,poor specificity,imunostimulatory activity,and delivery barrier. The 2-nucleotide(nt) 3’-overhang of siRNAs is essential for their efficiency,and specificity,which contact directly with binding affinity between 3’-overhang and PAZ.4 Though different overhang structural have been explored,which include sugar limit,abasic,distance between phosphodiester backbone and nucleobase,enantioselectivity and steric hindrance, the design of more specific,potent and powerful siRNA molecules has been urgently needed.Inspired by this context,we explored the effect of two isomerized nucleotide analog possessing propargyl group instead of nucleobase on potency and specificity of siRNA.The result showed that the silencing activities of siRNAs containing the β-analog(X) are almost equal to those of normal siRNAs with natural nucleosides at their 3’-overhang regions,and better than α-analog(Y) modified siRNAs.Conversely,lower binding of Y increased specificity of siRNA.We found that stronger binding happened between PAZ and β-analog not α-analog via atomistic simulations and free energy calculations.Moreover,the propargyl analog,described here do have function capable of triggering "click reaction" with azides.This work provides the guidance for the design of powerful and safe synthetic nucleotide analogues for substitution at the 3’-overhang.

关键词： RNAi-based therapy siRNAs propargyl analog 3’-overhang

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Journal of Environmental Sciences 2024年第1期135卷 570-584页

作者： Jiawei ma Lin Li State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China National Engineering Laboratory for VOCs Pollution Control material&Technology University of Chinese Academy of SciencesBeijing 101408China

The biopharmaceutical industry contributes substantially to volatile organic compounds(VOCs)emissions,causing growing concerns and social developmental conflicts.This study conducted an on-site investigation of the process-based emission of VOCs from three biopharmaceutical enterprises.In the workshops of the three enterprises,26 VOCs were detected,which could be sorted into 4 classes:hydrocarbons,aromatic hydrocarbons,oxygen-containing compounds,and nitrogen-containing compounds.Ketones were the main components of waste gases,accounting for 44.13%-77.85%of the overall VOCs.Process-based source profiles were compiled for each process unit,with the fermentation and extraction units of tiamulin fumarate being the main source of VOC emissions.Dimethyl heptanone,vinyl acetate,diethylamine,propylene glycol methyl ether(PGME),and benzene were screened as priority pollutants through a fuzzy comprehensive evaluation system.Ground level concentration simulation results of the Gauss plume diffusion model demonstrated that the diffusivity of VOCs in the atmosphere was relatively high,indicating potential non-carcinogenic and carcinogenic risks 1.5-2 km downwind.Furthermore,the process-based formation potentials of ozone and secondary organic aerosols(SOAs)were determined and indicated that N-methyl-2-pyrrolidone,dimethyl heptanone,and PGME should be preferentially controlled to reduce the ozone formation potential,whereas the control of benzene and chlorobenzene should be prioritized to reduce the generation of SOAs.Our results provide a basis for understanding the characteristics of VOC emission by biopharmaceutical industries and their diffusion,potentially allowing the development of measures to reduce health risks and secondary pollution.

关键词： Biopharmaceutical Volatile organic compound Priority pollutant Exposure risk Secondary pollution

A source term model of perturbation in a numerical study on flows around a slender body of revolution at a high angle of attack

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Progress in Natural Science:materials International 2009年第12期19卷 1831-1835页

作者： Yang Liu,Dongjun ma,dejun Sun~*,Xieyuan Yin Department of Modern Mechanics,University of Science and Technology of China,Hefei 230027,China Department of Modern Mechanics University of Science and Technology of China Hefei 230027 China

A numerical study on flows around a slender body of revolution at a high angle of attack is conducted to investigate the influence of strength and circumferential angle of perturbation on flow asymmetry.A source term model is applied to simulate a real geometrical perturbation near the tip of the slender body.It can greatly facilitate the adjustment of perturbation strength.The results show that the bistable phenomenon does not appear any more at a small perturbation strength.For different perturbation strengths,the energy of the asymmetric perturbation flow experiences a similar spatial exponential growth regime with the same growth rate.The appearance of the bistable phenomenon is closely related to nonlinear saturation of the perturbation flow as perturbation strength increases.

关键词： Slender body High angle of attack Asymmetric vortex Source term model

Nuclear phylogenomics of angiosperms and insights into their relationships and evolution

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Journal of Integrative Plant Biology 2024年第3期66卷 546-578页

作者： Guojin Zhang Hong ma College of Life Sciences Hunan Normal UniversityChangsha 410081China Department of Biology 510 Mueller LaboratoryHuck Institutes of the Life SciencesThe Pennsylvania State UniversityUniversity ParkPA 16802USA

Angiosperms(flowering plants) are by far the most diverse land plant group with over 300,000 species. The sudden appearance of diverse angiosperms in the fossil record was referred to by Darwin as the “abominable mystery,”hence contributing to the heightened interest in angiosperm evolution. Angiosperms display wide ranges of morphological, physiological,and ecological characters, some of which have probably influenced their species richness. The evolutionary analyses of these characteristics help to address questions of angiosperm diversification and require well resolved phylogeny. Following the great successes of phylogenetic analyses using plastid sequences,dozens to thousands of nuclear genes from next-generation sequencing have been used in angiosperm phylogenomic analyses, providing well resolved phylogenies and new insights into the evolution of angiosperms. In this review we focus on recent nuclear phylogenomic analyses of large angiosperm clades, orders, families,and subdivisions of some families and provide a summarized Nuclear Phylogenetic Tree of Angiosperm Families. The newly established nuclear phylogenetic relationships are highlighted and compared with previous phylogenetic results. The sequenced genomes of Amborella,Nymphaea, Chloranthus, Ceratophyllum, and species of monocots, magnoliids, and basal eudicots, have facilitated the phylogenomics of relationships among five major angiosperms clades. All but one of the 64 angiosperm orders were included in nuclear phylogenomics with well resolved relationships except the placements of several orders. Most families have been included with robust and highly supported placements, especially for relationships within several large and important orders and families.Additionally, we examine the divergence time estimation and biogeographic analyses of angiosperm on the basis of the nuclear phylogenomic frameworks and discuss the differences compared with previous analyses. Furthermore,we discuss the implications of nuclear phylogenomic analyses on ancestral

关键词： angiosperms evolution flowering plants nuclear gene phylogenomics phylogeny