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Diverse nucleotide substitutions in rice base editing mediated by novel TadA variants

plant communications 2024年第8期5卷 104-112页

作者： Man Yu Yongjie Kuang chenyang Wang Xuemei Wu Shaofang Li Dawei Zhang Wenxian Sun Xueping Zhou Bin Ren Huanbin Zhou state key lab.ratory for biology of plant Diseases and Insect pests Institute of Plant ProtectionChinese Academy of Agricultural SciencesBeijing 100193China Department of plant pathology China Agricultural UniversityBeijing 100193China Scientific Observing and Experimental Station of crop pests in Guilin Ministry of Agriculture and Rural AffairsGuilin 541399China Ministry of Education key lab.ratory for bio-Resource and Eco-Environment College of Life ScienceState Key Laboratory of Hydraulics and Mountain River EngineeringSichuan UniversityChengdu 610064China state key lab.ratory of Vegetable biobreeding National Engineering Research Center for VegetablesBeijing Vegetable Research CenterBeijing Academy of Agriculture and Forestry ScienceBeijing 100097China state key lab.ratory of Rice biology Institute of BiotechnologyZhejiang UniversityHangzhou 310058China key lab.ratory of Gene Editing Technologies(Hainan) Ministry of Agricultural and Rural AffairsSanya 572024China

cRISpR-mediated base editors have been widely used to correct defective alleles and create novel alleles by artificial evolution for the rapid genetic improvement of *** editing capabilities of base editors strictly rely on the performance of various nucleotide modification *** with the welldeveloped adenine base editors(ABEs),cytosine base editors(cBEs)and dual base editors suffer from unstable editing efficiency and patterns at different genomic loci in rice,significantly limiting their ***,we comprehensively examined the base editing activities of multiple evolved TadA8e variants in *** found that both TadA-cDd and TadA-E27R/N46L achieved more robust c-to-T editing than previously reported hyperactive hAID*D,and TadA-cDd outperformed TadA-E27R/N46L.A c-to-G base editor(cGBE)engineered with TadA-cDd and OsUNG performed highly efficient c-to-G editing in rice compared with that of *** addition,a dual base editor constructed with a single protein,TadDE,enabled simultaneous,highly efficient c-to-T and A-to-G editing in ***,our results demonstrate that TadA8e derivatives improve both cBEs and dual base editors in rice,providing a powerful way to induce diverse nucleotide substitutions for plant genome editing.

关键词： cRISpR TadA variants cytosine base editing dual base editor rice

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Synthesis,Structure and chemical Bonding of polyantimony clusters containing coinage Metals[M_(2)Sb_(14)]^(4-)(M=cu,Ag)

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chinese Journal of chemistry 2024年第6期42卷 617-622页

作者： Wei-Xing chen Yu-He Xu cui-cui Wang Lei Qiao Zi-Yan Guo Wen-Juan Tian Zhong-Ming Sun state key lab.ratory of Element-organ.c chemistry Tianjin Key Lab for Rare Earth Materials and ApplicationsSchool of Materials Science and EngineeringNankai UniversityTianjin300350 China Institute of Molecular Science Shanxi UniversityTaiyuanShanxi030006 China

Binary polyantimony clusters,namely[cu_(2)Sb_(14)]^(4–) and [Ag_(2)Sb_(14)]^(4–),containing coinage metals,were successfully synthesized and characterized,in which two homoatomic Sb73–subunits are bridged by two coinage metals in η^(4):η^(1) and η^(1):η^(1) coordinat.on modes,***[M_(2)Sb_(14)]^(4-),two bridging cu ions and two Sb atoms form a planar rhombic unit,which was revealed to have antiaromatic properties by theoretical *** electron structure and bonding analysis confirmed the presence of delocalized bonds in the rhombic unit and the metallophilic interaction between two formal M^(+) ions.

关键词： polyantimony cluster copper Silver Antiaromaticity Metallophilic interaction Quantum chemical calculations

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Inhibition effect of sulfation on pt/TiO_(2) catalysts in methane combustion

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chinese Journal of Structural chemistry 2024年第5期43卷 18-21页

作者： Fanxin Kong Hongzhi Wang Huimei Duan School of Environmental Science and Engineering State Key Laboratory of Bio-fibers and Eco-textilesInstitute of Marine Biobased MaterialsQingdao UniversityQingdao266071China college of chemistry and chemical Engineering Ocean University of ChinaQingdao266100China

Methane as an attractive clean energy is a strong greenhouse gas with the global warming potential 86 times higher than that of cO_(2)over 20 years[1].Hence,the removal of unburned methane emitted from nat.ral gas application processes is a serious environmental ***,methane is a geometrically high-symmetric and nonpolar molecule with high c-H bond energy(439 kJ mol^(-1))and low electron affinity(4.4 eV),rendering it extremely difficult to be activated under mild conditions[2].

关键词： methane rendering attractive

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Highly selective photocatalytic reduction of cO_(2) to cH_(4) on electron-rich Fe sp.c.es cocatalyst under visible light irradiation

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carbon Energy 2024年第1期6卷 255-266页

作者： Qianying Lin Jiwu Zhao pu Zhang Shuo Wang Ying Wang Zizhong Zhang Na Wen Zhengxin Ding Rusheng Yuan Xuxu Wang Jinlin Long state key lab.ratory of photocatalysis on Energy and Environment College of ChemistryFuzhou UniversityFuzhouChina

Efficient photocatalytic reduction of cO_(2) to high-calorific-value cH4,an ideal target product,is a blueprint for c_(1)industry relevance and carbon neutrality,but it also faces great ***,we demonstrate unprecedented hybrid Sic photocatalysts modified by Fe-based cocatalyst,which are prepared via a facile impregnat.on-reduction method,featuring an optimized local electronic *** exhibits a superior photocatalytic carbon-based products yield of 30.0μmol g^(−1) h^(−1) and achieves a record cH_(4) selectivity of up to 94.3%,which highlights the effectiveness of electron-rich Fe cocatalyst for boosting photocatalytic performance and ***,the synergistic effects of directional migration of photogenerated electrons and strongπ-back bonding on low-valence Fe effectively strengthen the adsorption and activation of reactants and intermediates in the cO_(2)→cH_(4) *** study inspires an effective strategy for enhancing the multielectron reduction cap.c.ty of semiconductor photocatalysts with low-cost Fe instead of noble metals as cocatalysts.

关键词： artificial synthesis of cH_(4) electronic structure optimization Fe sp.c.es cocatalyst photocatalytic cO_(2) reduction Sic

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Frequency-modulated continuous-wave multiplexed gas sensingbased on optical frequency comb calibration

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chinese physics B 2024年第9期33卷 152-163页

作者： Linhua Jia Xinghua Qu Fumin Zhang state key lab.ratory of precision Measurement Technology and Instruments Tianjin UniversityTianjin 300072China

Laser absorption sp.c.roscopy has proven to be an effective approach for gas sensing, which plays an important rolein the fields of military, industry, medicine and basic research. This paper presents a multiplexed gas sensing system basedon optical frequency comb (OFc) calibrated frequency-modulated continuous-wave (FMcW) tuning nonlinearity. Thesystem can be used for multi-parameter synchronous measurement of gas absorption sp.c.rum and multiplexed opticalpath. Multi-channel parallel detection is realized by combining wavelength division multiplexing (WDM) and frequencydivision multiplexing (FDM) techniques. By introducing nonlinear optical crystals, broadband sp.c.rum detection is simultaneouslyachieved over a bandwidth of hundreds of nanometers. An OFc with ultra-high frequency stability is used asthe frequency calibration source, which guarantees the measurement accuracy. The test samples involve H13c14N, c_(2)H_(2)and Rb vapor cells of varying densities and 5 parallel measurement experiments are designed. The results show that themeasurement accuracies of sp.c.ral absorption line and the optical path are 150 MHz and 20 m, resp.c.ively. The schemeoffers the advantages of multiplexed, multi-parameter, wide sp.c.rum and high resolution detection, which can realize theidentification of multi-gas components and the high-precision inversion of absorption lines under different *** proposed sensor demonstrates great potential in the field of high-resolution absorption sp.c.rum measurement for gassensing applications.

关键词： frequency-modulated continuous-wave (FMcW) technology optical frequency comb multiplexing absorption sp.c.roscopy

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Effect of Sodium Tripolyphosphate and Silica Fume on Hydration of High Alumina cement

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Journal of Wuhan University of Technology(Materials Science) 2024年第5期39卷 1246-1252页

作者： WANG Jingran YANG Zongyuan ZHANG Shuai ZHANG Jinhua HAN Bingqiang KE changming The state key lab.ratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081China

It was found that silica fume can reduce the maximum hydration heat release rate of cement by microcalorimetry,inhibit cAH_(10),promote the generation of c_(3)AH_(6)and strätlingite c_(2)ASH_(8),or promote the conversion of cAH_(10)to c_(3)AH_(6).Sodium tripolyphosphate can retard the early hydration of cement,have a slight effect on 1 d hydration products of cement and inhibit the generation hydration *** tripolyphosphate and silica fume can promote the early hydration of cement,advance the formation of c_(2)ASH_(8)or the conversion from cAH_(10)to c_(3)AH_(6)at 1 d.

关键词： high aluminum cement silica fume dispersing agent hydration

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High-Efficiency Dynamic Scanning Strategy for powder Bed Fusion by controlling Temperature Field of the Heat-Affected Zone

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chinese Journal of Mechanical Engineering 2024年第1期37卷 203-214页

作者： Xiaokang Huang Xiaoyong Tian Qi Zhong Shunwen He cunbao Huo Yi cao Zhiqiang Tong Dichen Li state key lab.ratory of Manufacturing Systems Engineering Xi’an Jiaotong UniversityXian 710049China

Improvement of fabrication efficiency and part performance was the main challenge for the large-scale powder bed fusion(pBF)*** this study,a dynamic monitoring and feedback system of powder bed temperature field using an infrared thermal imager has been established and integrated into a four-laser pBF equipment with a working area of 2000 mm×2000 *** heat-affected zone(HAZ)temperature field has been controlled by adjusting the scanning speed ***,the relationship among spot size,HAZ temperature,and part performance has been *** fluctuation of the HAZ temperature in four-laser scanning areas was decreased from 30.85℃to 17.41℃.Thus,the consistency of the sintering performance of the produced large component has been *** on the controllab.e temperature field,a dynamically adjusting strategy for laser spot size was proposed,by which the fabrication efficiency was improved up to 65.38%.The current research results were of great significance to the further industrial applications of large-scale pBF equipment.

关键词： powder bed fusion Efficiency Large-scale Spot size Heat-affected zone(HAZ)

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Effect of operating conditions on the performance of riser reactor for oxidative coupling of methane Author links open overlay panel

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particuology 2024年第8期91卷 235-248页

作者： Min cai Shuangzhu Kong Mengxi Liu chunxi Lu state key lab.ratory of Heavy Oil processing China University of PetroleumBeijing102249China

Oxidative coupling of methane(OcM)is characterized by high temperature and strong heat released.A riser reactor is designed for the OcM process to improve gas-solid contacting and heat *** work illustrates the effect of hydrodynamic conditions and feed gas composition on the performance of an OcM riser *** findings suggest that oxidative reactions predominantly occur within the acceleration zone and developed flow ***,at the low superficial gas velocity accompanied by a high solid circulating rate,the c_(2)yield initially increases in the acceleration zone,followed by a decrease in the developed flow zone and deceleration *** optimal operating conditions are a sp.c.fic region corresponding to the solids holdup ranges from 0.015 to ***,the c_(2)yield can be elevated using an appropriate feed mixture.

关键词： Oxidative coupling of methane Riser Hydrodynamics Solids holdup

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pore Formation Mechanism in W-c Hard coatings Using Directed Energy Deposition on Tungsten Alloy

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Acta Metallurgica Sinica(English Letters) 2024年第1期37卷 89-101页

作者： Xinrui Zhang Weijie Fu chen Wang Zhenglong Lei Haoran Sun Xudong Li state key lab.ratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin150001China

porosity is a common phenomenon and can significantly hinder the quality of the ***,the pore formation mechanism and the characteristics of the single tracks of the W-c coating using directed energy deposition(DED)are systematically *** forming quality of the tracks,the distribution of the pores,and the elemental distribution near the pores are analyzed by the observations of the cross-sections of the *** temperature field of the melt pool is discussed comprehensively to reveal the pore formation *** results confirm that Ni and co evaporated during the DED process due to the high temperature of the melt *** were continuously produced adjacent to the fusion line when the melt pool was about to solidify since the temperature at the solidification front was higher than the boiling point of *** vaporization area at the fusion line was proposed,where Ni could also evaporate at the time the melt pool started to *** relationship between the solidification rate,the size of the vaporization area and the DED parameters(laser power and scanning speed)was established to discuss the causes of severe pores above the fusion *** work contains a practical guide to reduce or eliminat. the porosity in the coating preparation process on the surface of the tungsten alloy.

关键词： Directed energy deposition(DED)process Tungsten alloy W-c coating pores Binder phase

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Simultaneously optimizing exciton diffusion length and nonradiative energy loss in organ.c solar cells via ternary strategy

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Science china chemistry 2024年第9期67卷 3004-3011页

作者： Huanxiang Jiang Hao Lu Zezhou Liang Yonghai Li Guangliu Ran chenyu Han Yuqiang Liu Hongxiang Li Xichang Bao Zhishan Bo college of Textiles and clothing State Key Laboratory of Bio-fibers and Eco-textilesQingdao UniversityQingdao 266071China Qingdao Institute of bioenergy and bioprocess Technology Chinese Academy of SciencesQingdao 266101China key lab.ratory for physical Electronics and Devices of the Ministry of Education&Shaanxi Key Lab of Photonic Technique for InformationSchool of Electronics Science&EngineeringFaculty of Electronic and Information EngineeringXi’an Jiaotong UniversityXi’an 710049China Department of physics and Applied Optics Beijing Area Major lab.ratory Center for Advanced Quantum StudiesBeijing Normal UniversityBeijing 100875China college of polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu 610065China lab.ratory of Solar Energy Shandong Energy InstituteQingdao 266101China

Significant nonradiative energy loss and short exciton diffusion length in organ.c solar cells(OScs)are two major obstacles to achieving state-of-the-art *** is crucial to conduct a study on the intensive mechanism and improvement strategies for future breakthroughs in the efficiency of *** this work,nonradiative energy loss and exciton diffusion length are optimized simultaneously by incorporating a guest acceptor(LA15)to construct ternary OSc(D18:L8-BO:LA15).Firstly,LA15 exhibits excellent compatibility with the host acceptor L8-BO,and effectively improves the fluorescence quantum efficiency(FLQY),resulting in suppressed non-radiative energy ***,LA15 effectively prolongs the fluorescent lifetime of the acceptor phase from 0.85 to 1.12 ns,leading to larger exciton diffusion length,which is beneficial for reducing geminat. ***,the addition of LA15 optimizes the crystallinity of the active layer with amplified charge transport *** a result,the optimized D18:L8-BO:LA15 device achieves ultralow nonradiative energy loss of 0.18 e V and improved fill factor(FF)with high efficiency up to 19.13%.These results highlight the crucial roles of regulating FLQYand exciton lifetime in achieving highefficiency OScs.

关键词： organ.c solar cells nonradiative energy loss exciton lifetime exciton diffusion length

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