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Selective and stable elimination of endosymbionts from multiple-infected whitefly Bemisia tabaci by feeding on a cotton plant cultured in antibiotic solutions

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Insect Science 2020年第5期27卷 964-974页

作者： Dong-Xiao Zhao Zhi-Chun Zhang hong-tao niu Hui-Fang Guo Institute of Plant Protection Jiangsu Academy of Agricultural SciencesNanjingChina

The maternally heritable endosymbiont provides many ecosystem *** elimination of a specific symbiont and establishment of experimental host lines lacking certain symbionts enable the roles of a given symbiont to be *** whitefly Bemisia tabaci(Gennadius)in China harbors obligate symbiont Portiera infecting each in-dividual,as well as facultative symbionts,such as Hamiltonella,Rickettsia and Cardinium,with co-infections occurring relatively *** far no studies have evaluated the selectivity and efficacy of a specific symbiont elimination using antibiotics in whiteflies co-infected with different ***,no success has been achieved in estab-lishing certain symbiont-free *** *** this study,we treated Hamiltonella infected *** line,Hamiltonella-Rickettsia-co infected line and Hamiltonella-Cardinium co-infected line by feeding *** adults with cotton plants cultured in water containing ri-fampicin,ampicillin or a mixture of them,aiming to selectively curing symbiont infections and establishing stable symbiont-free *** found ampicillin selectively eliminated Cardinium without afecting Portiera,Hamiltonella and Rickettsia,although they coex-isted in the same host ***,all of the symbionts considered in our study can be removed by *** reduction of facultative symbionts occurred at a much quicker pace than obligate symbiont Portiera during rifampicin ***,we measured the stability of symbiont elimination in whitefly successive generations and established Rickettsia-infected and Cardinium-infected lines which are absent in natural *** results provide new protocols for selective elimination of symbionts co-existing in a host and establishment of different symbiont-infected host lines.

关键词： antibiotic treatment Bemisia tabaci co-infections endosymbionts infection frequency

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Construction and application of multicomponent fluorescent droplets

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Chinese Chemical Letters 2025年第1期36卷 137-146页

作者： Wei-tao Dou Qing-Wen Zeng Yan Kang Haidong Jia Yulian niu Jinglong Wang Lin Xu Shanghai Key Laboratory of Green Chemistry and Chemical Processes Shanghai Frontiers Science Center of Molecule Intelligent SynthesesSchool of Chemistry and Molecular EngineeringEast China Normal UniversityShanghai 200062China Shanghai Jahwa United Co. Ltd.Shanghai 200082China Chongqing Key Laboratory of Precision Optics Chongqing Institute of East China Normal UniversityChongqing 401120China

The rapid development of microfluidic technology has led to the evolution of microdroplets from simple emulsion structures to complex multilayered and multicompartmental *** advancements have endowed microdroplets with the capability to contain multiple compartments that remain isolated from one another,enabling them to carry different molecules of ***,researchers can now investigate intricate spatially confined chemical reactions and signal transduction pathways within subcellular ***,modern microdroplets often possess excellent optical transparency,allowing fluorescently labelled,multi-layered,and compartmental droplets to provide detailed insights through real-time,in situ,and dynamic fluorescence ***,this review systematically summarizes current methodologies for preparing multicomponent microdroplets and their applications,particularly focusing on fluorescent ***,it discusses existing critical challenges and outlines future research *** offering a comprehensive overview of the preparation methods and applications of fluorescent microdroplets,this review aims to stimulate the interest of researchers and foster their utilization in more complex and biomimetic environments.

关键词： Fluorescent Microfluidic Fluorescent droplets Multilayered droplets Multicompartmental droplets

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Oxidative degradation and upcycling of polyethylene wastes

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Science China Chemistry 2025年第2期68卷 430-443页

作者： Yizhen Che Yanfen Wu Zhiqiang niu State Key Laboratory of Chemical Engineering Department of Chemical EngineeringTsinghua UniversityBeijing 100084China Ordos Laboratory Ordos 017010China

Plastics have become omnipresent in modern life due to their versatility and ***,this convenience comes at the cost of substantial waste *** inherent chemical stability of plastics complicates its recycling,leading to environmental pollution and ecological *** mini-review highlights recent advancements in addressing this challenge by oxidative transformation of polyethylene(PE)into new functional polymers,value-added chemicals,and carbon-based *** first discuss the introduction of hydroxyl,carbonyl groups onto PE with a focus on the functionalization degree and ***,approaches for PE oxidation into dicarboxylic acids and short-chain oxidized PE are described and compared,with an emphasis on the tandem reactions for converting mixed dicarboxylic acids into other value-added *** also briefly discuss the oxidative transformation of PE into carbon-based materials and summarize the progress in qualitative and quantitative analysis of oxidation ***,we conclude this mini-review by highlighting the challenges and opportunities in the field.

关键词： oxidation polyethylene upcycling chemical conversion plastics

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Applications of in-situ solid-state nuclear magnetic resonance in methanol to olefins reaction

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Science China Chemistry 2025年第1期68卷 134-151页

作者： Jing niu Shutao Xu Yingxu Wei Zhongmin Liu National Engineering Research Center of Lower-Carbon Catalysis Technology Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China University of Chinese Academy of Sciences Beijing 100049China

The methanol-to-olefins(MTO)reaction offers an alternative pathway for the production of low-carbon olefins from non-oil *** research has been impeded by a lack of comprehensive understanding of its underlying mechanism,despite the significant progress made in ***-situ solid-state nuclear magnetic resonance(ss NMR)spectroscopy has emerged as a pivotal tool,offering crucial insights into key species under real-time operando ***,the host–guest interaction between zeolites or surface species residing on zeolites and the reactant/active intermediates is revealed by the combination of in-situ^(13)C MAS NMR and 2D correlation ***,recent technological advancements in hyperpolarization(HP)methods,including HP^(129)Xe NMR and dynamic nuclear polarization(DNP),have significantly improved the sensitivity of ssNMR,enabling detailed structural and kinetic analysis as well as the detection of trace *** this feature article,we summarized recent advancements in(in-situ)ssNMR spectroscopy applied to MTO reaction processes,encompassing mechanistic investigations at various stages and the intricate host–guest *** theoretical insights into the dynamic evolution of MTO reactions lay a solid foundation for the optimization of catalytic processes and the development of efficient catalysts,thereby advancing the techniques towards more sustainable and economical production route for olefins.

关键词： MTO zeolites in-situ ssNMR reactive intermediates reaction mechanism

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Model and Data Hybrid Driven Approach for Quantifying the Meteorology-Dependent Demand Flexibility of Building Thermal Loads

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CSEE Journal of Power and Energy Systems 2025年第1期11卷 394-405页

作者： Bo Hu Xin Cheng Changzheng Shao tao niu Chunyan Li Yue Sun Wei Huang Kaigui Xie State Key Laboratory of Power Transmission Equipment and System Security Chongqing UniversityChongqing400030China

Recently, the heat and electricity integrated energy system (HE-IES) has become a hot topic in both industry and academia. In the HE- IES, the potential flexibility of the buildings' thermal loads can be exploited to relax the heat power balance constraints and consequently allow a more flexible operation of the combined heat and power units. In this paper, model-driven and data-driven techniques are combined to quantify the demand flexibility of the buildings' thermal loads in a non-instructive way. First, the explicit analytical equivalent thermal parameter (ETP) model of the aggregated buildings is developed. The heat transfer coefficient (k) and thermal inertia coefficient (C) of the ETP model are designated to measure the potential demand flexibility. Second, the Particle Swarm Optimization optimized Radial Basis Function neural network (PSO-RBF) is used to identify the relationship between the values of k and C and the meteorological factors. To obtain the training data, an innovative two-stage regression method based on the adaptive temporal resolution is proposed to extract k and C values from the historical thermal load data. Finally, a flexible thermal load model is built based on the predictions of the meteorological factors, which can be conveniently incorporated into the online dispatch of the HE-IES. A comprehensive simulation environment is designed to verify the accuracy and availability of the proposed technique.

关键词： Flexibility of buildings'thermal loads heat and electricity integrated energy system meteorological factors model and data hybrid driven.

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YOLO-based lightweight traffic sign detection algorithm and mobile deployment

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Optoelectronics Letters 2025年第4期21卷 249-256页

作者： WU Yaqin ZHANG tao niu Jianjun CHANG Yan LIU Ganjun Software College Shanxi Agricultural University School of Electrical Automation and Information Engineering Tianjin University

This paper proposes a lightweight traffic sign detection system based on you only look once(YOLO). Firstly, the classification to fusion(C2f) structure is integrated into the backbone network, employing deformable con... 详细信息

关键词： A

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Eigenvalue-Free Interval for Seidel Matrices of Cographs

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Journal of Mathematical Research with Applications 2025年第1期45卷 1-10页

作者： Heming niu Wei WANG School of Mathematics Physics and Finance Anhui Polytechnic University

Abstract The distribution of Seidel eigenvalues of cographs is investigated in this *** prove that there is no Seidel eigenvalue of nontrivial cographs in the interval (-1,1).We also show the optimality of the interval (-1,1) in the sense that for any■>0 either of the intervals(1,1+■) and (-1-■,-1) contains a Seidel eigenvalue of some cograph of order n when n is sufficiently large.

关键词： cograph Seidel matrix eigenvalue-free interval

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Green revolution gene drives adaptation of Arabidopsis to the extremely high altitude

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Science China Life Sciences 2025年第03期 859-870页

作者： Xing-Hui Hou Yong-Chao Xu Tian-Shu Sun Yan-Bo Gong Xin-Tong Li Guang-Teng Jin Yu-tao Bian Yi-Ni Liu Juan Jiang Xiao-Min niu hong-Ya Gu Ya-Long Guo State Key Laboratory of Systematic and Evolutionary Botany Institute of Botany Chinese Academy of Sciences China National Botanical Garden State Key Laboratory for Protein and Plant Gene Research School of Life Sciences Peking University College of Life Sciences University of Chinese Academy of Sciences

To elucidate the process of adaptation, particularly the traits subject to natural selection and the molecular mechanisms underlying their natural variation, is one of the primary objectives of evolutionary biology. The uplifted landscape offers an excellent framework for understanding how organisms adapt to dramatic climatic gradients. To investigate the genetic basis of plant adaptation to the extremely high altitude, we first compared the genomic and phenotypic variations of two closely related Arabidopsis thaliana accessions from high altitude(Xizang, also known as “Tibet”) and low altitude(Yunnan), respectively. The Xizang population represents a relict group characterized by a small effective population size. Notably, the Xizang genome has more transposable elements(TEs) and more gene loss-offunction(LoF) mutations. Differentially expressed genes were enriched in biological processes of cellular response to oxygen-containing compound, regulation of defense response, and response to light intensity. Intriguingly, the phenotypic selection analysis revealed that silique density was under natural selection. Furthermore, we genetically mapped and validated that the LoF mutation of GA20ox1, the homologous gene of green revolution in rice, resulted in a higher silique density in Xizang Arabidopsis. Given that GA20ox1 is linked to Arabidopsis adaptation to the Alps Mountains, its parallel evolution plays an important role in the adaptation to Alpine habitats. Overall,our results highlight that identifying adaptive traits and elucidating the molecular mechanisms underlying natural variation of these traits is crucial for unraveling the mystery of adaptive evolution and has significant implications for crop breeding.

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Coating colloidal particles with a well-defined polymer layer by surface-initiated photoinduced polymerization-induced self-assembly and the subsequent seeded polymerization

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Chinese Chemical Letters 2025年第2期36卷 213-217页

作者： Bing niu honggao Huang Liwei Luo Li Zhang Jianbo Tan Department of Polymeric Materials and Engineering School of Materials and EnergyGuangdong University of Technology Guangdong Provincial Key Laboratory of Functional Soft Condensed Matter

Core-shell colloidal particles with a polymer layer have broad applications in different ***,we developed a two-step method combining aqueous surface-initiated photoinduced polymerization-induced self-assembly and photoinduced seeded reversible addition-fragmentation chain transfer (RAFT) polymerization to prepare a diverse set of core-shell colloidal particles with a well-defined polymer *** compositions,structures,and thicknesses of polymer layers could be conveniently regulated by using different types of monomers and feed[monomer]/[chain transfer agent]ratios during seeded RAFT polymerization.

关键词： Core-shell colloidal particles Photoinduced polymerization-induced self-assembly RAFT polymerization Seeded polymerization Surface-initiated polymerization

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Excellent high-temperature strength of (HfZrTiTaNb)C high-entropy carbide diffusion-bonded joint via in-situ alloying of Ni/Nb/Ni composite interlayer

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JOURNAL OF ADVANCED CERAMICS 2025年第1期14卷 127-133,136-139页

作者： Mu, Ruijie Wang, Ying niu, Shiyu Sun, Kongbo Yang, Zhenwen Tianjin Univ Sch Mat Sci & Engn Tianjin Key Lab Adv Joining Technol Tianjin 300350 Peoples R China Minist Educ Key Lab Adv Ceram & Machining Technol Tianjin 300350 Peoples R China

To obtain high-entropy carbide (HEC) joints with excellent high-temperature performance, a (HfZrTiTaNb)C HEC joint featuring a direct diffusion-bonded interface with a Nb-based interlayer was successfully fabricated at relatively low temperatures of 1150-1250 degrees C for 60 min under 10 MPa. Starting from a modified Ni/Nb/Ni composite interlayer with a Nb content of > 64 at%, an alloyed Nb2Ni layer was constructed in situ by accelerating the directional diffusion of Ni atoms from the high-entropy interface into the remaining pure Nb through the Ni-Nb eutectic liquid. Moreover, the excess liquid phase was squeezed out of the bonding region, ensuring the absence of Ni-based compounds. Leveraging the intrinsic interfacial stability and sluggish diffusion effect, the HEC with its original lattice structure, was capable of developing diffusion bonding with the Nb2Ni layer instead of interacting with the liquid phase. The high reliability of the HEC/Nb2Ni bonded interface was confirmed by the coherence of (1 3) (HEC)// (141) (Nb2Ni) and a calculated lattice misfit of 0.044. The HEC joint had a high room-temperature strength of 174 MPa because of the homogenous Nb2Ni layer, which exhibited nanohardness (15.2 +/- 1.5 GPa) and an elastic modulus of 219.9 +/- 17.5 GPa. Furthermore, the strength of the HEC joint did not decrease at 1000 degrees C, increasing by similar to 49% over that of HEC/Ni/HEC diffusion-bonded joints, which have stringent surface flatness requirements. This suggested that the HEC/Nb2Ni interface had excellent resistance to high-temperature softening, even though it was invariably the initial failure location. This work is informative for designing bonding structures and preparing HEC components.

关键词： high-entropy ceramic diffusion bonding in situ alloyed interlayer mechanical properties

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