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Photoluminescence and photothermal conversion in boric acid derived carbon dots for targeted microbial theranostics

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Chinese Chemical Letters 2024年第09期 258-263页

作者： Yiqiao chen Ao Liu Biwen Yang zhenzhen Li Binggang Ye Zhouyi Guo Zhiming Liu Haolin chen Department of Anesthesiology General Hospital of Southern Theater Command of People's Liberation Army MOE Key Laboratory of Laser Life Science & Guangdong Provincial Key Laboratory of Laser Life Science College of Biophotonics South China Normal University Healthy Medical Engineering Technology Research Center Guangdong Food and Drug Vocational College

Theranostic carbon dots(CDs) have attracted widespread attention recently due to their tunable optical properties and diverse bioactivities. Beyond fluorescent imaging application, the photothermal property endows CDs with the potential for microbial inactivation. However, realization of the effective conversion between fluorescence and heat in one CD system has rarely been reported. Herein, we provide a simple strategy for targeted microbial theranostics based on 4-carboxyphenylboronic acid-derived CDs(PCBA-CDs) which possess concentration-dependent photoluminescence/photothermal features. At lower concentrations, PCBA-CDs show bright and stable fluorescent signals ranging from blue to green. The fluorescence intensity gradually decreases with increasing concentration, while on the contrary, the photothermal effect of PCBA-CDs ascends progressively due to the rearrangement of electronic transitions in aggregated CDs. PCBA-CDs also demonstrate high affinity to the polysaccharide structures on the surface of microbe which allows rapid microbial fluorescence imaging as well as specific photothermal ablation of pathogens in skin wounds using PCBA-CDs at lower and higher concentrations, respectively. This study supplies a facile nanotheranostic strategy for just-in-time microbial management using bioactive CDs.

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Adipokinetic hormone signaling regulates adult dehydration resistance in the migratory locust

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Journal of Integrative Agriculture 2024年第9期23卷 3104-3117页

作者： Xianliang Huang Dai Shi Kai Deng Shuzhen Jia Ding Ding Li Hou Bing chen College of Life Sciences Hebei UniversityBaoding 071002China Hebei Basic Science Center for Biotic Interaction Hebei UniversityBaoding 071002China State Key Laboratory of Integrated Management of Pest Insects and Rodents Institute of ZoologyChinese Academy of SciencesBeijing 100101China

Drought events have become more severe under climate change,and this can pose a major threat to the survival of various *** molecular mechanisms involved in dehydration resistance are not well ***,adults of the migratory locust,Locusta migratoria,were subjected to food-mediated dehydration,and adipokinetic hormone(AKH)signaling was found to play a key role in regulating dehydration ***,dehydration shortened the lifespan,increased the body weight loss,and reduced the water loss rate in adult *** transcriptome profiles revealed variations in tissue-specific gene expression between dehydration-resistant locusts and normal ***,dehydration selection and exposure induced prominent expression of AKH genes in the retrocerebral complex of adult ***,individual knockdown of AKH1,AKH2,or AKH receptor(AKHR)accelerated water loss and shortened the lifespan of adult locusts under dehydration conditions,and trehalose supplementation ameliorated the negative effects caused by interference with AKH or *** findings demonstrated that AKH/AKHR signaling-dependent trehalose metabolism plays a crucial role in regulating locust dehydration resistance and thus provide novel insights into the regulatory mechanism underlying drought resistance.

关键词： adipokinetic hormone adipokinetic hormone receptor trehalose dehydration resistance Locusta migratoria

Solid-state NMR study of the stability of MOR framework aluminum

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Chinese Journal of Structural Chemistry 2024年第4期43卷 7-14页

作者： Xinzhi Ding Chong Liu Jing Niu Nan chen Shutao Xu Yingxu Wei Zhongmin Liu National Engineering Research Center of Lower-Carbon Catalysis Technology Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian116023China State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian116023China University of Chinese Academy of Sciences Beijing 100049China School of Chemistry Dalian University of TechnologyDalian116024China

MOR zeolite has been effectively utilized for dimethyl ether(DME)carbonylation reaction due to its unique pore structure and *** industrial production,the transformation of ammonium type MOR zeolite(NH_(4)-MOR)into proton type MOR zeolite(H-MOR)causes inevitable ***,understanding the influencing factors and dynamic evolution mechanism of zeolite dealumination is *** this work,the stability of framework aluminum was studied by X-ray diffraction(XRD),Fourier transform infrared(FT-IR)spectroscopy,^(29)Si,^(27)Al,^(1)H magic angle spinning nuclear magnetic resonance(MAS NMR),and DME carbonylation performance *** results indicate that extra-framework cation Na^(+)and NH_(4)^(+)could better preserve the aluminum structure of the MOR zeolite framework compared to H^(+),primarily due to the different'attraction'of the framework to ***,the impact of water on the zeolite framework aluminum at high temperature was studied by manipulating the humidity of the calcination atmosphere,revealing the formation of extra-framework six-coordinated aluminum(Al(Ⅵ)-EF)and the mechanism of water influence on the zeolite framework aluminum.

关键词： H-MOR Solid-state NMR H2O Framework aluminum stability Dealumination

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基于改进YOLOv3的车辆检测算法

控制与决策 2024年第4期39卷 1151-1159页

作者：陈文玉赵怀慈刘鹏飞房建孙晖中国科学院光电信息处理重点实验室沈阳110016 中国科学院沈阳自动化研究所沈阳110016 中国科学院机器人与智能制造创新研究院沈阳110169 中国科学院大学北京100049

交通场景下的车辆检测问题存在小目标多、目标遮挡严重等情况,鉴于此,提出一种基于改进YOLOv3的车辆检测算法.由于小目标仅包含较少的像素,特征不明显,算法在空间金字塔结构中融入软池化操作,搭建Soft-SPP结构将多重感受野融合,通过软... 详细信息

交通场景下的车辆检测问题存在小目标多、目标遮挡严重等情况,鉴于此,提出一种基于改进YOLOv3的车辆检测算法.由于小目标仅包含较少的像素,特征不明显,算法在空间金字塔结构中融入软池化操作,搭建Soft-SPP结构将多重感受野融合,通过软池化操作最大程度地保留细节,有效提取小目标特征;引入坐标注意力机制,在调整每个通道特征分配权重的同时能够捕捉具有精确位置信息的远程依赖关系;提出一种新的损失函数KIoU Loss作为边界框损失函数,同时考虑边界框的关键点与长宽比使之回归更加准确.实验结果表明,改进后的算法在自动驾驶KITTI数据集上平均精度达到94.69%,相比原始YOLOv3算法精度提升4.13%,且检测速度仅下降3.16 frame·s^(-1),在保持检测速度的情况下能够明显提升检测精度.

关键词：车辆检测深度学习 YOLOv3 坐标注意力 Soft-SPP KIoU Loss

远场水下爆炸冲击作用下重力坝动力稳定性的简化时程分析方法

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工程力学 2024年第3期41卷 73-81页

作者：黄宇峰卢文波王高辉陈明严鹏武汉大学水资源与水电工程科学国家重点实验室湖北武汉430072 武汉大学水工岩石力学教育部重点实验室湖北武汉430072

高坝大库的抗爆与防护是国防安全的重要研究课题。该文针对远场水下爆炸冲击作用下混凝土重力坝的稳定安全评价问题,研究了远场水下爆炸冲击波的传播及其与坝体的相互作用过程;基于波动理论和平面波假设,建立了重力坝爆炸动应力场的简... 详细信息

高坝大库的抗爆与防护是国防安全的重要研究课题。该文针对远场水下爆炸冲击作用下混凝土重力坝的稳定安全评价问题,研究了远场水下爆炸冲击波的传播及其与坝体的相互作用过程;基于波动理论和平面波假设,建立了重力坝爆炸动应力场的简化理论计算模型,最终建议了一种远场水下爆炸冲击波作用下重力坝动力稳定性的简化时程分析方法;同时结合工程实际,采用该方法对某混凝土重力坝的动力稳定性进行了分析。结果表明:在远场爆炸冲击荷载作用下,重力坝的稳定安全系数呈现出先增后减再增并最终保持恒定的变化规律;下游坝面反射形成的拉伸波与剪切波的共同作用是导致建基面稳定安全系数降低的主要原因。

关键词：混凝土重力坝水下爆炸坝体动应力动力稳定性时程分析

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The Nano Research Young Innovators Awards in bio-inspired nanomaterials

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Nano Research 2024年第2期17卷 417-425页

作者： Jun chen Shuotao Wang Department of Bioengineering University of CaliforniaLos AngelesLos AngelesCA 90095USA Key Laboratory of Bio-inspired Materials and Interfacial Science Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China

Nano Research Young Innovators(NR45)Awards are designed to acknowledge and celebrate the achievements of young researchers under 45 years of *** individuals have made significant contributions to the field of nanoscience and *** the inaugural NR45 Awards in 2018,the journal's editorial board has recognized over a hundred innovators specializing in nanobiotechnology,nano energy,two-dimensional materials,and *** focus of the 2023 NR45 Awards is on bioinspired nanomaterials,acknowledging thirty-three outstanding young innovators for their extraordinary contributions in developing these materials with applications spanning clean energy,human healthcare,monitoring,and disease treatments,as shown in *** extend our heartfelt congratulations to all the 33 NR45 Awardees in 2023!

关键词： journal materials contributions

Advanced cellulose-based materials toward stabilizing zinc anodes

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Science China Chemistry 2024年第5期67卷 1465-1484页

作者： Zhijiang Li Xiang chen Rui Zhang Taoyi Shen Jianchao Sun Zhongce Hu Lin Li Lanlan Yang Hou-Yong Yu College of Textile Science and Engineering(International Institute of Silk) Zhejiang Sci-Tech UniversityHangzhou 310018China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Donghua UniversityShanghai 201620China School of Environment and Material Engineering Yantai UniversityYantai 264005China Institute for Carbon Neutralization College of Chemistry and Materials EngineeringWenzhou UniversityWenzhou 325035China

Rechargeable aqueous zinc metal batteries(RAZMBs) have received extensive attention for large-scale energy storage systems due to the merits of Zn anodes, including moderate volumetric and gravimetric energy density, low redox potential, abundant reserve, low cost and impressive intrinsic safety. However, Zn anodes suffer from a series of adverse reactions(dendrite growth,hydrogen evolution, and surface passivation) resulting in low Coulombic efficiency, large polarization, and unsatisfied cycling performance, which inevitably hinder the wide application of RAZMBs. To address the above issues, cellulose-based materials are widely used for Zn anode protection because of their unique physical and chemical properties and other advantages such as biocompatibility, non-toxicity, degradability and easy extraction. In order to better understand the current progress in cellulosebased materials for the Zn anode protection, we have classified and summarized the relevant literatures. In this review, we summarize and elaborate the causes of poor reversibility for Zn anodes, including dendrite formation, hydrogen evolution, and surface passivation. Subsequently, the effective strategies(anode interfacial engineering, gel electrolyte optimization, and separator modification) of cellulose-based materials toward stabilizing Zn anodes are overviewed. In the end, the existing challenges and prospects of cellulose-based materials in Zn anode protection are summarized to shed light on future work.

关键词： Zn anode cellulose anode interfacial engineering gel electrolyte optimization separator modification

Zn和Gd元素含量和比例对铸态和挤压态Mg-8Li合金显微组织和力学性能的影响

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Transactions of Nonferrous Metals Society of China 2024年第3期34卷 798-811页

作者：黄玉川张泉达欧阳思杰孙福臻孙家伟李蕙宇吴国华陈培军刘文才中国机械科学研究总院集团有限公司先进成形技术与装备国家重点实验室北京100083 北京机科国创轻量化科学研究院有限公司北京100083 上海交通大学材料科学与工程学院轻合金精密成型国家工程中心和金属基复合材料重点实验室上海200240 洛阳晟雅镁合金科技有限公司洛阳471921

研究Zn和Gd元素含量及其质量比对铸态和挤压态Mg-8Li合金显微组织和力学性能的影响。挤压后,析出相破碎。β-Li中分散着粒径约100 nm的球形微粒。形成了由长条状α-Mg粗晶和再结晶β-Li细晶组成的双峰结构。挤压后合金的强度和塑性显著... 详细信息

研究Zn和Gd元素含量及其质量比对铸态和挤压态Mg-8Li合金显微组织和力学性能的影响。挤压后,析出相破碎。β-Li中分散着粒径约100 nm的球形微粒。形成了由长条状α-Mg粗晶和再结晶β-Li细晶组成的双峰结构。挤压后合金的强度和塑性显著提高,且屈服强度和极限抗拉强度随Zn和Gd含量的增加而增加。Mg-8Li-8Zn-2Gd合金表现出最优的综合性能,其屈服强度、极限抗拉强度和伸长率分别为274 MPa、283 MPa和39.9%。挤压态合金主要强化机制为由β-Li的细晶强化和α-Mg的织构强化组成的双模态结构强化和析出相的弥散强化。

关键词：镁锂合金挤压变形双峰结构弥散强化

The RUBY reporter for visual selection in soybean genome editing

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aBIOTECH 2024年第2期5卷 209-213页

作者： Li chen Yupeng Cai Xiaoqian Liu Weiwei Yao Shuiqing Wu wensheng Hou State Key Laboratory of Crop Gene Resources and Breeding Institute of Crop SciencesChinese Academy of Agricultural SciencesBeijing 100081China Ministry of Agriculture Key Laboratory of Soybean Biology(Beijing) Institute of Crop SciencesChinese Academy of Agricultural SciencesBeijing 100081China

Current systems to screen for transgenic soybeans(Glycine max)involve laborious molecular assays or the expression of fluorescent markers that are difficult to see in soybean ***,a visual system for early screening of transgenic plants would increase the efficiency of crop improvement by genome *** RUBY reporter system,which consists of three genes encoding betalain biosynthetic enzymes,leading to the accumulation of purple pigment in transgenic tissue,has been employed in some plants and dikaryon ***,we assessed the RUBY reporter for visual verification during soybean *** show that RUBY can be expressed in soybean,allowing for visual confirmation of transgenic events without the need for specialized *** with visible accumulation of purple pigment in any tissue were successfully transformed,confirming the accuracy of the RUBY system as a visual *** also assessed the genetic stability of the transgene across generations,which can be performed very early,using the cotyledons of the ***-free seedlings have a distinct green color,facilitating the selection of genome-edited but transgene-free soybean seedlings for *** the RUBY system,we quickly identified a transgene-free Gmwaxy mutant in the T1 *** system thus provides an efficient and convenient tool for soybean genome editing.

关键词： Soybean RUBY Visual reporter Genome editing Biotechnology