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A circular single-stranded DNA mycovirus infects plants and confers broad-spectrum fungal resistance

Molecular Plant 2024年第6期17卷 955-971页

作者： xianhong wang Ioly Kotta-Loizou Robert H.A.Coutts Huifang Deng Zhenhao Han Ni Hong Karim Shafik Liping wang Yashuang Guo Mengmeng Yang Wenxing Xu Guoping wang National Key Laboratory for Germplasm Innovation&Utilization of Horticultural Crops Wuhan 430070China Hubei Hongshan Laboratory Wuhan 430070China College of Plant Science and Technology Huazhong Agricultural UniversityWuhan 430070China Key Lab of Plant Pathology of Hubei Province Wuhan 430070China Department of Life Sciences Faculty of Natural SciencesImperial College LondonLondon SW72AZUK Department of Clinical Pharmaceutical and Biological ScienceSchool of Life and Medical SciencesUniversity of HertfordshireHatfield AL109ABUK Department of Plant Pathology Faculty of AgricultureAlexandria UniversityAlexandria 21526Egypt

Circular single-stranded DNA(ssDNA)viruses have been rarely found in fungi,and the evolutionary and ecological relationships among ssDNA viruses infecting fungi and other organisms remain *** this study,a novel circular ssDNA virus,tentatively named Diaporthe sojae circular DNA virus 1(DsCDV1),was identified in the phytopathogenic fungus Diaporthe sojae isolated from pear ***1 has a monopartite genome(3185 nt in size)encapsidated in isometric virions(21-26 nm in diameter).The genome comprises seven putative open reading frames encoding a discrete replicase(Rep)split by an intergenic region,a putative capsid protein(CP),several proteins of unknown function(P1-P4),and a long intergenic ***,the two split parts of DsCDV1 Rep share high identities with the Reps of Geminiviridae and Genomoviridae,respectively,indicating an evolutionary linkage with both *** analysis based on Rep or CP sequences placed DsCDV1 in a unique cluster,supporting the establishment of a new family,tentatively named Gegemycoviridae,intermediate to both ***1 significantly attenuates fungal growth and nearly erases fungal virulence when transfected into the host ***,DsCDV1 can systematically infect tobacco and pear seedlings,providing broad-spectrum resistance to fungal *** localization analysis revealed that DsCDV1 P3 is systematically localized in the plasmodesmata,while its expression in trans-complementation experiments could restore systematic infection of a movement-deficient plant virus,suggesting that P3 is a movement ***1 exhibits unique molecular and biological traits not observed in other ssDNA viruses,serving as a link between fungal and plant ssDNA viruses and presenting an evolutionary connection between ssDNA viruses and *** findings contribute to expanding our understanding of ssDNA virus diversity and evolution,offering potential biocontrol applications for managing crucial plant d

关键词： circular single-stranded DNA virus mycovirus virus evolution Genomoviridae Gegemycoviridae Diaporthe sojae circular DNA virus 1

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In situ molecular level visualization of RAFT polymerization by AIEgen-labelled agents

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Science China Chemistry 2018年第10期61卷 1197-1198页

作者： xianhong wang Key Laboratory of Polymer Ecomaterials Changchun Institute of Applied Chemistry Chinese Academy of Sciences

Can we see clearly the whole polymerization process?Normally, it is difficult and thus is a dream for researchers in polymer science. That is why techniques for monitoring the polymerization process have always been a major focus in both academic and industrial field owing to their potential for quality control and process optimization. Several methods,such as rheometry, viscometry and dilatometry, have been developed to study the kinetics of polymerization ***, these methodologies examine only the macroscopic viscosity instead of at the molecular level.

关键词：聚合过程分子可视化代理人标记水研究人员过程优化

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Temperature-responsive Catalyst for the Coupling Reaction of Carbon Dioxide and Propylene Oxide

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Chinese Journal of Chemistry 2018年第4期36卷 299-305页

作者： ChunweiZhuo Yusheng Qin xianhong wang Fosong wang Key Laboratory of Polymer Ecomaterials Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun Jilin 130022 China University of Science and Technology of China Hefei Anhui 230026China

The selective synthesis of polypropylene carbonate （PPC） and cyclic propylene carbonate （CPC） from coupling reaction of CO_2 and propylene oxide （PO） is a long term pursuing target. Here we report that a temperature controllable porphyrin aluminum catalyst using 5,10,15,20-tetra（1,2,3,4,5,6, 7,8-octahydro-1,4：5,8-dimethanoanthracen-g-yl）porphyrin as ligand, once in conjunction with suitable onium salt, achieved single cycloaddition or co- polymerization reaction. Only cydoaddition reaction happened at temperature above 75 ℃ to produce 100% CPC, whereas copolymerization became dominant to afford PPC with selectivity over 99% at 25℃, and the obtained PPC showed over 99% carbonate linkage and 92% head-to-tail structure. Based on systematic analysis of the electronic and steric feature in the porphyrin ligand, it was found that the electronic feature of the substituent in porphyrin ligand was decisive for PPC selectivity, porphyrin ligand bearing strong electron-donating substituents displayed a significantly reduced toler- ance towards increased temperature with respect to PPC formation. Therefore, temperature-responsive catalyst could be designed by suitable modifica- tion in porphyrin ligand, and such accurate synthesis of target product by one catalyst may create a useful and facile platform for selective PPC or CPC production.

关键词： carbon dioxide propylene oxide copolymerization cycloaddition aluminum porphyrin

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Carbon dioxide copolymers:Emerging sustainable materials for versatile applications

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SusMat 2021年第1期1卷 88-104页

作者： Han Cao xianhong wang Key Laboratory of Polymer Ecomaterials Chinese Academy of SciencesChangchun Institute of Applied ChemistryChangchunP.R.China University of Science and Technology of China HefeiP.R.China

Carbon dioxide(CO_(2))is cheap,renewable,abundant,and nontoxic carbon feedstocks in chemical *** the past two decades,utilization of CO_(2)in polymer science has become a meaningful topic bridging two separate subjects,namely CO_(2)valorization and sustainable polymer *** review summarizes the recent progress in CO_(2)copolymer materials from synthesis to material performance adjustment,focusing on commercialized or potential commodity sustainable materials such as biodegradable polycarbonates and new structure polyurethanes from CO_(2)-polyol building blocks.

关键词： synthesis. dioxide versatile

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Controlled synthesis of CO_2-diol from renewable starter by reducing acid value through preactivation approach

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Science China Chemistry 2016年第11期59卷 1369-1375页

作者： Shunjie Liu Yusheng Qin Hongchen Guo xianhong wang Fosong wang University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Polymer Ecomaterials Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China

Synthesis of polyols from carbon dioxide（CO2） is attractive from the viewpoint of sustainable development of polyurethane industry;it is also interesting to adjust the structure of the CO2-polyols for versatile requirement of ***,when renewable malonic acid was used as a starter,the copolymerization reaction of CO2 and propylene oxide（PO） was uncontrollable,since it proceeded slowly（13 h） and produced 40.4 wt%of byproduct propylene carbonate（PC） with a low productivity of 0.34kg/g.A careful analysis disclosed that the acid value of the copolymerization medium was the key factor for controlling the copolymerization ***,a preactivation approach was developed to dramatically reduce the acid value to 0.6mg（KOH）/gby homopolymerization of PO into oligo-ether-diol under the initiation of malonic acid,which ensured the controllable copolymerization,where the copolymerization time could be shortened by 77%from 13 to 3 h,the PC content was reduced by 76%from 40.4 wt%to 9.4 wt%,and the productivity increased by 61%from 0.34 to 0.55 kg/***,by means of preactivation approach,the molecular weight as well as the carbonate unit content in the CO2-diol was also controllable.

关键词： CO_2-polyols renewable starter acid value controllable copolymerization preactivation approach

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Chain-transfer-catalyst: strategy for construction of site-specific functional CO_(2)-based polycarbonates

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Science China Chemistry 2022年第1期65卷 162-169页

作者： Enhao wang Shunjie Liu Han Cao Chunwei Zhuo xianhong wang Fosong wang Key Laboratory of Polymer Ecomaterials Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China University of Science and Technology of China Hefei 230026China

Site-specific functional polymers are generally synthesized from functionalized chain transfer agents(CTA)in the presence of ***,the poor solubility or chemical inertness of CTAs may make polymerizations ***,this issue is addressed by proposing a strategy of designing chain-transfer-catalyst(CTC)that combines catalyst and CTA into *** occurrence of catalytic effect naturally triggers the chain transfer process to give catalyst-labeled polymers with well-defined *** a proof-of-concept,cobalt(III)porphyrin catalysts with one,two and four hydroxyl groups act as efficient CTCs,giving the corresponding site-specific functional poly(propylene carbonate)s(PPC),diversifying the topology of ***,porphyrin-capped PPCs with controllable Mn in the range of 1,000–16,800 g mol^(-1)were obtained by using monofunctional CTC(CTCOH).Moreover,different from traditional“catalyst+CTA”systems,a novel dynamic network transfer mechanism of CTCOH was *** study provides a CTC strategy for the synthesis of site-specific functional polymers.

关键词： chain-transfer-catalyst metalloporphyrin complex immortal polymerization CO_(2)copolymerization

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Environmentally benign metal catalyst for the ring-opening copolymerization of epoxide and CO_(2): state-of-the-art, opportunities, and challenges

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Green Chemical Engineering 2022年第2期3卷 111-124页

作者： Han Cao Shunjie Liu xianhong wang Key Laboratory of Polymer Ecomaterials Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun130022China

Carbon dioxide(CO_(2))is the main greenhouse gas,whereas it is also a nontoxic,abundant,cheap carbon and oxygen *** copolymerization of CO_(2) with epoxide presents a sustainable approach to the synthesis of biodegradable polymers,which upcycles the waste into *** complex catalyst plays the central role in the reaction,since it provides oxophilic and Lewis acidic active center both for monomer activation and chain end stabilization,and nucleophiles as Lewis base for ***,heavy metal catalyst with certain toxicity such as cobalt undisputedly dominates the copolymerization catalysis which comprises the overall *** circumvent the potential environmental hazard,developing highly active catalyst composed of green metals is of great importance especially when the polymer was utilized for agriculture *** work reviews the development of sustainable metal catalysts for the production of CO_(2) copolymer,centered by Al,Mg,Ti,Fe,generally acknowledged as low toxic,environmentally benign,biocompatible,and also abundant in earth's *** is placed in recent five years where several historic examples are also included to construct a full picture of the sustainable catalysis explored to date.

关键词： Green catalysis Aluminum catalyst Sustainable polymer CO_(2)valorization Ring-opening polymerization

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Construction of Self-Reporting Biodegradable CO_(2)-Based Polycarbonates for the Visualization of Thermoresponsive Behavior with Aggregation-Induced Emission Technology

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Chinese Journal of Chemistry 2021年第11期39卷 3037-3043页

作者： Molin wang Enhao wang Han Cao Shunjie Liu xianhong wang Fosong wang Key Laboratory of Polymer Ecomaterials Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchunJilin130022 China School of Applied Chemistry and Engineering University of Science and Technology of ChinaHefeiAnhui230026 China

Thermoresponsive polymers with simultaneous biodegradability and signal“self-reporting”outputs that meet for advanced applications are hard to *** address this issue,we developed fluorescence signal“self-reporting”biodegradable thermoresponsive polycarbonates through the immortal copolymerization of CO_(2)and oligoethylene glycol monomethyl ether-functionalized epoxides in the presence of hydroxyl-modified tetraphenylethylene(TPE-OH).TPE-OH was used as chain transfer agent to afford well-defined polycarbonates with controlled molecular weight(6000—17000 g·mol^(–1))and aggregation-induced emission *** temperature-dependent fluorescence intensity study,low critical solution transition of TPE-labeled polycarbonates were determined and the fine details of thermal-induced phase transition process were *** research indicated that temperature-controlled aggregation and dissociation of TPE moieties are the main reason for fluorescence intensity *** anticipate that this work could offer a method to visualize the thermal transition process of thermoresponsive polycarbonates and broaden their application fields as smart materials.

关键词： Ring-opening polymerization Fluorescence Thermoresponsive polymers Phase transitions Visualization CO_(2)copolymerization

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Polymeric aluminum porphyrin:Controllable synthesis of ultra-low molecular weight CO_(2)-based polyols

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中国化学快报:英文版 2023年第8期34卷 434-438页

作者： Chunwei Zhuo Han Cao Xiaoshen wang Shunjie Liu xianhong wang Key Laboratory of Polymer Ecomaterials Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China University of Science and Technology of China Hefei 230026China

Carbon dioxide-based polyols with ultra-low molecular weight(ULMW,Mn<1000 g/mol)are emergent polyurethane precursors with economic and environmental ***,the lack of effective proton-tolerant catalytic systems limits the development of this *** this work,the polymeric aluminum porphyrin catalyst(PAPC)system was applied to the copolymerization of CO_(2)and propylene oxide,where sebacic acid,bisphenol A,poly(ethylene glycol),and water were used as chain transfer agents to achieve the controlled synthesis of CO_(2)-*** molecular weight of the resulting CO_(2)-polyols could be facilely regulated in the range of 400–930 g/mol at low catalyst loadings,fully demonstrating its catalytic advantages of high activity,high product selectivity,and excellent proton tolerance of ***,the catalytic efficiency of PAPC could reach up to 2.1–5.2 kg/g under organic CTA conditions,even reaching 1.9 kg/g using water as the *** cPC content could be controlled within 1.0 wt%under the optimized conditions,indicating the excellent controllability of the PAPC *** CO_(2)-polyols combines the advantages of low viscosity(∼3000 mPa s at 25°C),low glass transition temperature(∼−73°C),and high carbonate unit content(∼40%),which is important for the development of high-performance polyurethanes.

关键词： CO_(2)-polyols Polymeric catalyst Aluminum porphyrin Ultra-low molecular weight Proton tolerance

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MRI在子宫肉瘤术前诊断中的研究进展

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磁共振成像 2024年第9期15卷 218-223页

作者：李琛蓉毕国力毕秋刘秀兰张应从王先虹成长鑫昆明理工大学医学院昆明650000 云南省第一人民医院(昆明理工大学附属医院)磁共振科昆明650032

子宫肉瘤(uterine sarcomas,US)是女性生殖系统恶性程度较高的间质性肿瘤,发病率低,预后差。随着微创、无创治疗及精准医学的发展,术前准确识别US将有助于临床制订个性化治疗方案。本文将对MRI常规序列、功能成像技术以及基于MRI的人工... 详细信息

子宫肉瘤(uterine sarcomas,US)是女性生殖系统恶性程度较高的间质性肿瘤,发病率低,预后差。随着微创、无创治疗及精准医学的发展,术前准确识别US将有助于临床制订个性化治疗方案。本文将对MRI常规序列、功能成像技术以及基于MRI的人工智能分析在US诊断方面的研究进展进行综述。旨在帮助临床及影像科医生了解US影像诊断相关的研究现状,为实现精准医疗奠定基础。

关键词：子宫肉瘤磁共振成像功能磁共振成像人工智能

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