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Engineering Shewanella-re duce d graphene oxide aerogel biohybrid to efficiently synthesize Au nanoparticles

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Journal of Materials Science & Technology 2024年第1期168卷 50-61页

作者： Baocai Zhang Shulin Shao Huan Yu Qijing Liu Sicheng Shi qingyuan wu Zijie wu Yiyu Feng Yifei Wang Xi Sun Deguang wu Feng Li Hao Song Frontier Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering(Ministry of Education) Tianjin UniversityTianjin 300072China Collaborative Innovation Center of Chemical Science and Engineering(Tianjin) School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical TechnologyBeijing 100029China School of Materials Science and Engineering Tianjin UniversityTianjin 300350China College of Biological Engineering Tianjin Agricultural UniversityTianjin 300384China Department of Brewing Engineering Moutai InstituteLuban AveRenhuai 564507China

Biosynthesizing Au nanoparticles(AuNPs)from gold-bearing scraps provides a sustainable method to meet the urgent demand for ***,it remains challenging to efficiently biosynthesize AuNPs of which the diameter is less than 10 nm from a trace amount of Au^(3+)concentration at the level of tens ***,we constructed an exoelectrogenic cell(eCell)-conductive reduced-graphene-oxide aero-gel(rGA)biohybrid by assembling Shewanella sp.S1(SS1)as living biocatalyst and rGA as conductive ad-sorbent,in which Au^(3+)at trace concentrations would be enriched by the adsorption of rGA and reduced to AuNPs through the extracellular electron transfer(EET)of *** regulate the size of the synthe-sized AuNPs to 10 nm,the strain SS1 was engineered to enhance its EET,resulting in strain RS2(pYYD-P tac-ribADEHC&pHG13-P_(bad)-omcC in SS1).Strain RS2 was further assembled with rGA to construct the RS2-rGA biohybrid,which could synthesize AuNPs with the size of 7.62±2.82 nm from 60 ppm Au^(3+)*** eCell-rGA biohybrid integrated Au^(3+)adsorption and reduction,which enabled AuNPs biosyn-thesis from a trace amount of Au^(3+).Thus,the required Au^(3+)ions concentration was reduced by one or two orders of magnitude compared with conventional methods of AuNPs *** work devel-oped an AuNPs size regulation technology via engineering eCell’s EET with synthetic biology methods,providing a feasible approach to synthesize AuNPs with controllable size from trace level of gold ions.

关键词： Au nanoparticles Exoelectrogenic cell(e-Cell) Shewanella Synthesis biology Extracellular electron transfer Reduced graphene oxide aerogel

Color center-rich γ-AlOpromotes propane dehydrogenation

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Science China Chemistry 2024年

作者： Yu Wang Xiang Wang Mengfei Qiao qingyuan wu Kunlong Liu Xiaodong Yi Ruixuan Qin Gang Fu Nanfeng Zheng State Key Laboratory for Physical Chemistry of Solid Surfaces Collaborative Innovation Center of Chemistry for Energy Materialsand Department of Chemistry College of Chemistry and Chemical Engineering Xiamen University Key Laboratory of the Ministry of Education for Advanced Catalysis Materials College of Chemistry and Material SciencesZhejiang Normal University Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM)

The PtSn/Al2O3catalyst is commonly used in commercial propane dehydrogenation （PDH） processes,but it faces challenges in the deactivation and periodic regeneration due to metal aggregation and coke deposition at high *** Al3+pentahas been proven to be beneficial for enhancing catalytic stability,bottom-up synthesis protocols usually restrict their ***,a facile post-treatment approach using acetic acid was applied to create color centers （electrons trapped within oxygen vacancies） on γ-Al3+***,the content of Alpentawas enriched to 18.3%.Then,the pre-established PtSn clusters were *** electrons facilitated the formation of ultrafine PtSn nanoparticles （～2 nm）,and the Al3+pentasites prevented the sintering of PtSn by constructing the strong Al3+penta–O–Sn ***,the catalytic durability of the catalyst prepared by conventional impregnation methods was remarkably extended from 186 h for the color center-free sample to 1,000 h using the HAc–*** facile post-modification was further successfully extended to commercial Al2O3pellets without altering their mechanical properties,highlighting its potential in industrial applications.

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Recent advances on application of polysaccharides in cosmetics

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Journal of dermatologic science and cosmetic technology

Journal of dermatologic science and cosmetic technology 2024年第1期1卷 21-36页

作者： qingyuan wu Na Cheng Danjiao Fang Hao Wang Faiz-Ur Rahman Huifang Hao Yongmin Zhang Inner Mongolia University Research Center for Glycochemistry of Characteristic Medicinal Resources School of Chemistry and Chemical EngineeringInner Mongolia UniversityHohhot 010021China Sorbonne Université CNRSInstitut Parisien de Chimie MoléculaireUMR 82324 Place Jussieu75005 ParisFrance Key Laboratory of Tropical Medicinal Resource Chemistry of Ministry of Education College of Chemistry and Chemical EngineeringHainan Normal UniversityHaikou 571158China

Natural products have attracted wide attention in the cosmetics market due to their safety and high *** a highly active substance in nature,natural polysaccharides have been reported in recent years to have various cosmetic activities such as moisturizing,whitening,anti-aging and repairing skin,and are becoming a hot research topic in the cosmetics *** present,the mechanism of polysaccharide exerting cosmetic activity has been widely studied,but the relationship between polysaccharide’s chemical structure and cosmetic activity has not been effectively analyzed,which leads to the limitation of polysaccharide *** this review,the mechanism of polysaccharides exerting cosmetic activities such as moisturizing,whitening,anti-aging and skin repair was *** potential relationship between the structure and activity of polysaccharides was summarized by analyzing the influence of physical and chemical properties of polysaccharides,such as extraction method,molecular weight,monosaccharide composition,functional group and structural modification,etc.,which laid a foundation for the analysis of the structure-activity relationship of polysaccharides and improved its cosmetic value.

关键词： Polysaccharide Cosmetics Physical and chemical properties Structure-activity relationship Biological activity

5月南极涛动对青藏高原西部夏季气温影响的诊断分析

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气象 2024年第3期50卷 344-356页

作者：张宇李清泉余锦华沈新勇毕淼吴清源南京信息工程大学气象灾害教育部重点实验室/气候与环境变化国际合作联合实验室/气象灾害预报预警与评估协同创新中心南京210044 中国气象局气候预测研究重点开放实验室国家气候中心北京100081 南方海洋科学与工程广东省实验室(珠海) 珠海519082 中国气象局气候资源经济转化重点开放实验室重庆市气象科学研究所重庆401147

青藏高原是全球气候变暖最敏感的地区之一,是北半球夏季最大的热源,其气候响应受到广泛关注。然而,有关南极涛动与青藏高原夏季气温的关系和机理知之甚少。为了研究南极涛动与青藏高原夏季气温的关系,基于1979—2020年英国东安哥拉大学... 详细信息

青藏高原是全球气候变暖最敏感的地区之一,是北半球夏季最大的热源,其气候响应受到广泛关注。然而,有关南极涛动与青藏高原夏季气温的关系和机理知之甚少。为了研究南极涛动与青藏高原夏季气温的关系,基于1979—2020年英国东安哥拉大学气候研究中心(CRU)的逐月气温、美国国家海洋和大气管理局(NOAA)的逐月海表面温度和大气环流再分析数据以及南极涛动指数等数据,采用相关、回归、合成分析等方法进行研究。结果表明,北半球夏季青藏高原西部气温与5月南极涛动存在显著负相关,即当5月南极涛动异常偏弱时,夏季青藏高原西部气温异常偏高。其影响过程为,南极涛动为正位相时,在南印度洋中高纬地区出现“负-正-负”的经向“三极子”海温模态,该模态可持续到夏季,在印度洋形成异常的纬向-垂直环流,相应在热带西印度洋和东印度洋-海洋性大陆之间的降水异常导致热带正“偶极子”降水模态,通过该降水模态在青藏高原西部引起异常反气旋环流和下沉运动,有利于高原西部气温偏高。研究结果显示,海洋的热惯性在“延长”南极涛动影响过程中起着重要的桥梁作用,可为青藏高原夏季气温预测提供科学依据。

关键词：南极涛动青藏高原印度洋气温

FEM simulation and experimental verification of roll forming and springback process under complex contact conditions

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High Technology Letters 2015年第4期21卷 433-438页

作者：阎昱 wu qingyuan Ai Zhengqing Jia Fanghui School of Mechanical and Materials Engineering North China University of Technology

The application of advanced high strength steel （AHSS） has an important significance in the development of the lightweight of automobile, but the parts made of AHSS usually have defects, such as fracture and large amount of springback, etc. In this paper, a model of multi-pass roll form- ing and springback process of AHSS is established with finite element software ABAQUS. Then a roll forming experiment is performed, and simulation and experimental results have been compared and analyzed. The model is established under complex contact conditions, including self-contact condi- tion. The results shows that during the process of sheet bending, large Mises stresses appear at ben- ding corners. The smaller the bending radius is, the larger the Mises stress and strain are. Thick- ness of sheet metal changes exceeds a certain limit, the differently if the bending radius is different. When the bending radius change tendency of the sheet thickness turns from increase to decrease.

关键词： roll forming FEM simulation springback experiment complex contact condition

Long-term trend of water vapor over the Tibetan Plateau in boreal summer under global warming

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Science China Earth Sciences 2022年第4期65卷 662-674页

作者： Jingwen YU Qingquan LI Yihui DING Jie ZHANG qingyuan wu Xinyong SHEN Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters/Key Laboratory of Meteorological Disaster Ministry of Education/Joint International Research Laboratory on Climate and Environment ChangeNanjing University of Information Science&TechnologyNanjing 210044China Laboratory for Climate Studies National Climate CenterChina Meteorological AdministrationBeijing 100081China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519082China

In this study,the long-term trend of water vapor over the Tibetan Plateau(TP)in boreal summer is investigated by using observation and reanalysis data from 1979 to *** historical experiment simulations of 19 models that participated in the Coupled Model Intercomparison Project phase 6(CMIP6)are evaluated,and the future variation tendency under four emission scenarios is *** results indicate that the water vapor content and the net water vapor budget over the TP show notable increasing trends,which are mainly manifested by a significant increase in the net water vapor import and a significant decrease in the water vapor export on the eastern boundary of the *** is mainly due to an anomalous anticyclone from Lake Baikal to the Mongolian *** CMIP6 multi-model ensemble can well simulate the variation characteristics of the TP net water vapor *** projection results indicate that by the end of the twenty-first century,the water vapor content,the net water vapor import and precipitation over the TP will *** a high-emissions scenario and compared with the current period(1991–2014),these three variables will increase by 47.99%,59.77%and 18.59%in the long term(2081–2100),*** significant enhancement of meridional water vapor transport over the northern TP may be the main reason for the increase in humidity over the TP.

关键词： Tibetan Plateau Boreal summer Water vapor transport Long-term trend Projection

基于线粒体功能探讨培宗气理论治疗慢性阻塞性肺疾病的机制研究

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天津中医药 2024年第1期41卷 117-122页

作者：吴清原郭思佳孙增涛李晓丹天津中医药大学研究生院天津301617 天津中医药大学第二附属医院天津300250 天津中医药大学医院管理处天津301617

慢性阻塞性肺疾病(COPD)是呼吸系统的常见病和多发病,由于其较高的致残率,对患者生活质量和社会经济产生了严重的负面影响。中医学认为“虚、痰、瘀”是其核心病机,而宗气的盛衰贯穿其病机演变全程。培土生金法为宗气理论治疗COPD的代... 详细信息

慢性阻塞性肺疾病(COPD)是呼吸系统的常见病和多发病,由于其较高的致残率,对患者生活质量和社会经济产生了严重的负面影响。中医学认为“虚、痰、瘀”是其核心病机,而宗气的盛衰贯穿其病机演变全程。培土生金法为宗气理论治疗COPD的代表性治法现已广泛用于COPD的临床治疗。西医证实线粒体功能和形态障碍是COPD病理及病理生理学发生发展的重要生物学机制。文章从“虚、痰、瘀”与线粒体功能的内在关系出发,探讨宗气理论和培土生金法在COPD治疗中的作用及机制,以期为其临床应用提供依据及指导。

关键词：慢性阻塞性肺疾病宗气理论培土生金线粒体

A bioactive nanocomposite sponge for simultaneous hemostasis and antimicrobial therapy

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Nano Research 2023年第3期16卷 4004-4012页

作者： Jiani Lei Shanshan Li Shuang Liu qingyuan wu Bolong Xu Zhijun Huang Nier wu Xiaolu Xiong Huiyu Liu Dongsheng Zhou Beijing Advanced Innovation Center for Soft Matter Science and Engineering State Key Laboratory of Organic-Inorganic CompositesBionanomaterials&Translational Engineering LaboratoryBeijing Key Laboratory of BioprocessBeijing Laboratory of Biomedical MaterialsBeijing University of Chemical TechnologyBeijing 100029China Beijing National Laboratory of Molecular Sciences Key Laboratory of Green PrintingInstitute of ChemistryChinese Academy of SciencesBeijing 100190China State Key Laboratory of Pathogen and Biosecurity Beijing Institute of Microbiology and EpidemiologyBeijing 100071China

Uncontrollable bleeding and bacterial infections are the major reasons for the high mortality of *** this study,a composite hemostatic chitosan sponge CaO_(2)@SiO_(2)/CS was prepared by combining a novel core-shell inorganic nano hemostatic CaO_(2)@SiO_(2)nanoparticles with carboxylated chitosan,which presents a multi-layered structure with a rough and hydrophilic surface for rapid absorption of *** the CaO_(2)@SiO_(2)nanoparticles in the CaO_(2)@SiO_(2)/CS come into contact with blood,the silanol group on its surface and the released H_(2)O_(2)and Ca2+can recruit and activate platelets,while generating fibrin clots and activating the endo-exogenous coagulation cascade reaction to achieve rapid *** H_(2)O_(2)released from CaO_(2)@SiO_(2)shows the antimicrobial capacity and stimulates the production of tissue factors by endothelial ***,the silica coating reduces the cytotoxicity of bare CaO_(2),thus reducing the risk of secondary bleeding at the site of vascular ***_(2)@SiO_(2)/CS(48 s)showed a 1.83-and 2.52-fold reduction in hemostasis time compared to commercial gelfoam and CS in a femoral artery hemorrhage *** study illustrates the hemostatic mechanism of CaO_(2)@SiO_(2)and provides a reference for the development of clinical biomedical inorganic hemostatic materials.

关键词： calcium peroxide coagulation mechanism composite sponge hemostasis antibacterial

Copper-hydride nanoclusters with enhanced stability by N- heterocyclic carbenes

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Nano Research 2021年第9期14卷 3303-3308页

作者： Hui Shen Lingzheng Wang Omar Lopez-Estrada Chengyi Hu qingyuan wu Dongxu Cao Sami Malola Boon KTeo Hannu Hakkinen Nanfeng Zheng State Key Laboratory for Physical Chemistry of Solid Surfaces Collaborative Innovation Center of Chemistry for Energy MaterialsNational&Local Joint Engineering Research Center of Preparation Technology of NanomaterialsCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China Departments of Physics and Chemistry Nanoscience CenterUniversity ofjyvdskyldFI-40014 JyvdskyldFinland

Copper-hydrides have been intensively studied for a long time due to their utilization in a variety of technologically important chemical ***,poor stability of the species severely hinders its isolation,storage and operation,which is worse for nano-sized *** report here an unprecedented strategy to access to ultrastable copper-hydride nanoclusters(NCs),namely,using bidentate N-heterocyclic carbenes as stabilizing ligands in addition to *** this work,a simple synthetic protocol was developed to synthesize the first large copper-hydride nanoclusters(NCs)stabilized by N-heterocyclic carbenes(NHCs).The NC,with the formula of Cu3i(RS)25(NHC)3H6(NHC=1,4-bis(1-benzyl-1 H-benzimidazol-1-ium-3-yl)butane,RS=4-fluorothiophenol),was fully characterized by high resolution Fourier transform ion cyclotron resonance mass spectrum,nuclear magnetic resonance,ultra-violet visible spectroscopy,density functional theory(DFT)calculations and single-crystal X-ray ***,the title cluster exhibits unprecedented Cu4 tetrahedron-based vertex-sharing(TBVS)superstructure(fusion of six Cu4 tetrahedra).Moreover,the ultrahigh thermal stability renders the cluster a model system to highlight the power of NHCs(even other carbenes)in controlling geometrical,electronic and surface structure of polyhydrido copper clusters.

关键词： metal clusters copper-hydride N-hetercxylic carbene stability superatom