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Effect of substituents on self-assembling behaviors and charge transport properties of nonplanar heterocycloarenes

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Science China Chemistry 2023年第10期66卷 2903-2911页

作者： Jiangyu Zhu Wenhao Li Rong Zhang Yan Zhao xuefeng lu Yunqi Liu Department of Materials Science State Key Laboratory of Molecular Engineering of PolymersFudan UniversityShanghai 200433China

(Hetero)cycloarenes possessing rigid molecular skeletons and largeπ-systems are the potential active materials in various electronic ***,the development of their organic electronics still lags far behind the synthetic ***,in order to bridge this gap,we reported the study of organic semiconductor materials based on heterocycloarenes in detail about the relationship between structure,properties,and device *** varying straight alkyl chain substituted butterflyshaped heterocycloarenes PTZs were strategically *** with bulky aryl(mesityl)substituted PTZ1,PTZs show additional self-assembly ***-dependent^(1)H NMR spectra indicated that the self-assembly behavior can be modulated by the alkyl chain *** alkyl chain length substituted heterocycloarene PTZ-C6 showed the strongest association constants of 490 M^(–1)in solution,and a similar trend was also observed in solid state by thin film absorption ***,despite the nonplanar conjugated backbones,solution-processing thin film transistor based on PTZ-C6 exhibits hole mobility up to 0.13 cm^(2)V^(–1)s^(–1)and considerable current on/off ratio of 10^(5).Our study demonstrates that substituent engineering of heterocycloarenes is a powerful strategy for modulating self-assembling structures and promoting transistor device performance.

关键词： heterocycloarenes self-assembling organic semiconductor organic thin film transistor

Sucrose Secreted by the Engineered Cyanobacterium and Its Fermentability

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Journal of Ocean University of China 2016年第5期15卷 890-896页

作者： DUAN Yangkai luO Quan LIANG Feiyan lu xuefeng Key Laboratory of Biofuels Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of Sciences Qingdao 266101 P. R. China University of Chinese Academy of Sciences Beifing 100049 P. R. China

The unicellular cyanobacterium, Synechococcus elongatus PCC 7942(Syn7942), synthesizes sucrose as the only compatible solute under salt stress. A series of engineered Syn7942 strains for sucrose production were constructed. The overexpression of the native sps(encoding a natively fused protein of sucrose phosphate synthase SPS and sucrose phosphate phosphatase SPP) in Syn7942 wild type caused a 93% improvement of sucrose productivity. The strain FL130 co-overexpressing sps and csc B(encoding a sucrose transporter) exhibited a 74% higher extracellular sucrose production than that overexpressing csc B only. Both results showed the significant improvement of sucrose productivity by the double functional protein SPS-SPP. Afterwards, FL130 was cultivated under a modified condition, and the cell-free culture medium containing 1.5 g L-1 sucrose was pre-treated with an acid hydrolysis technique. Cultivated with the neutralized hydrolysates as the starting media, two widely used microorganisms, Escherichia coli and Saccharomyces cerevisiae, showed a comparable growth with that in the control media supplemented with glucose. These results clearly demonstrated that the cell-free culture of sucrose-secreting cyanobacteria can be applied as starting media in microbial cultivation.

关键词： sucrose cultivation encoding cerevisiae comparable Saccharomyces microbial cultivated supplemented engineered

Review of data storage and management technologies for massive remote sensing data

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Science China(Technological Sciences) 2011年第12期54卷 3220-3232页

作者： lu xuefeng CHENG ChengQi GONG JianYa GUAN Li lnstitute of Remote Sensing and GIS Peking University Beijing 100871 China State Key Laboratory for Information Engineering in Surveying Mapping and Remote Sensing Wuhan University Wuhan 430079 China Beijing Institute ofSurveying and Mapping Beijing 100038 China

Aiming at the storage and management problems of massive remote sensing data,this paper gives a comprehensive analysis of the characteristics and advantages of thirteen data storage centers or systems at home and abroad. They mainly include the NASA EOS,World Wind,Google Earth,Google Maps,Bing Maps,Microsoft TerraServer,ESA,Earth Simulator,GeoEye,Map World,China Centre for Resources Satellite Data and Application,National Satellite Meteorological Centre,and National Satellite Ocean Application Service. By summing up the practical data storage and management technologies in terms of remote sensing data storage organization and storage architecture,it will be helpful to seek more suitable techniques and methods for massive remote sensing data storage and management.

关键词： remote data storage data management storage architecture data organization

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Slr0151 in Synechocystis sp. PCC 6803 is required for efficient repair of photosystem Ⅱ under high-light condition

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Journal of Integrative Plant Biology 2014年第12期56卷 1136-1150页

作者： Haomeng Yang Libing Liao Tingting Bo Lei Zhao Xuwu Sun xuefeng lu Birgitta Norling Fang Huang Key Laboratory of Photobiology Institute of Botany the Chinese Academy of Sciences University of the Chinese Academy of Sciences Qingdao Institute of Bioenergy and Bioprocess Technology the Chinese Academy of Sciences School of Biological Sciences Nanyang Technological University

Cyanobacteria are ancient photosynthetic prokareyotes that have adapted successfully to adverse environments including high-light irradiation. Although it is known that the repair of photodamaged photosystem Ⅱ（PSⅡ） in the organisms is a highly regulated process, our knowledge of the molecular components that regulate each step of the process is *** have previously identified a hypothetical protein Slr0151 in the membrane fractions of cyanobacterium Synechocystis *** 6803. Here, we report that Slr0151 is involved in PSⅡ repair of the organism. We generated a mutant strain（Dslr0151）lacking the protein Slr0151 and analyzed its characteristics under normal and high-light conditions. Targeted deletion of slr0151 resulted in decreased PSⅡ activity in Synechocystis. Moreover,the mutant exhibited increased photoinhibition due to impairment of PSⅡ repair under high-light condition. Further analysis using in vivo radioactive labeling and 2-D blue native/sodium dodecylsulfate polyacrylamide gel electrophoresis indicated that the PSⅡ repair cycle was hindered at the levels of D1 synthesis and disassembly and/or assembly of PSⅡ in the mutant. Protein interaction assays demonstrated that Slr0151 interacts with D1 and CP43 proteins. Taken together,these results indicate that Slr0151 plays an important role in regulating PSⅡ repair in the organism under high-light stress condition.

关键词： Cyanobacteria membrane protein photosystem Ⅱ repair Slr0151 Synechocystis

Long non-coding RNA DPP10-AS1 represses the proliferation and invasiveness of glioblastoma by regulating miR-24-3p/CHD5 signaling pathway

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BIOCELL 2023年第12期47卷 2721-2733页

作者： JIWEI SUN LIANG XU YESEN ZHANG HAORAN LI JIE FENG xuefeng lu JUN DONG Department of Neurosurgery The Second Affiliated Hospital of Soochow UniversitySuzhou215004China Department of Neurosurgery The First Affiliated Hospital of Bengbu Medical CollegeBengbu233000China

This investigation aimed to unveil new prospective diagnosis-related biomarkers together with treatment targets against ***:The expression levels of long non-coding RNA(lncRNA)DPP10-AS1 were assessed using real-time quantitative polymerase chain reaction(RT-qPCR)within both the patient tissue specimens and glioblastoma cell *** relationship between lncRNA DPP10-AS1 expression in glioblastoma and patient prognosis was *** Counting Kit-8(CCK-8),transwell,and clonogenic experiments were utilized to assess tumor cells’proliferation,invasiveness,and migratory potentials after lncRNA DPP10-AS1 expression was up or *** an online bioinformatics prediction tool,the intracellular localization of lncRNA DPP10-AS1 and its target miRNA were predicted,and RNA-FISH verified results.A dual-luciferase reporter experiment validated the relationship across miR-24-3p together with lncRNA ***-24-3p expression within glioblastoma was identified through RT-qPCR,and potential link across miR-24-3p and lncRNA DPP10-AS1 was assessed using Pearson correlation ***,influence from lncRNA DPP10-AS1/miR-24-3p axis upon glioblastoma cell progression was assessed in vivo via a subcutaneous xenograft tumor ***:The expression of lncRNA DPP10-AS1 was notably reduced in both surgical specimens of glioblastoma and the equivalent cell *** level of lncRNA DPP10-AS1 in glioblastoma is following poor *** downregulation of lncRNA DPP10-AS1 in glioblastoma cells resulted in enhanced cellular proliferation,migration,and invasion capabilities,accompanied by downregulated E-cadherin and upregulated vimentin and ***,the observed upregulation of lncRNA DPP10-AS1 demonstrated a substantial inhibitory function upon proliferation,invasion,and migratory capabilities of LN229 *** localization disclosed that lncRNA DPP10-AS1 had a binding site that interacted with ***

关键词： Glioblastoma lncRNA DPP10-AS1 miR-24-3p Chromodomain helicase DNA binding protein 5

Temperature field distribution of burnt surrounding rock in UCG stope

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International Journal of Mining Science and Technology 2014年第4期24卷 573-580页

作者： Xin Lin Wang Zuotang Huang Wengang Kang Guojun lu xuefeng Zhang Peng Wang Jianhua State Key Laboratory of Coal Resources and Safe Mining China University of Mining & Technology School of Mines China University of Mining & Technology Key Laboratory of Deep Coal Resource Mining Ministry of Education of China Low Carbon Energy Institute China University of Mining & Technology Xuzhou Coal Mining Group

In order to study temperature field distribution in burnt surrounding rock and to determine ranges of burnt surrounding rock, coal-wall coking cycle and heat influence in the underground coal gasification(UCG) stope, based on the Laplace transform and inversion formula, we studied the temperature analytical solution of one-dimensional unsteady heat conduction for multi-layer overlying strata under the first and the forth kinds of boundary conditions, and we also carried out a numerical simulation of twodimensional unsteady heat conduction by the COMSOL multiphysics. The results show that when the boundary temperature of surrounding rock has a linear decrease because of a directional movement of heat source in the UCG flame working face, the temperature in surrounding rock increases first and then decreases with time, the peak of temperature curve decreases gradually and its position moves inside surrounding rock from the boundary. In the surrounding rock of UCG stope, there is an envelope curve of temperature curve clusters. We analyzed the influence of thermophysical parameters on envelope curves and put forward to take envelope curve as the calculation basis for ranges of burnt surrounding rock, coal-wall coking cycle and heat influence. Finally, the concrete numerical values are given by determining those judgement standards and temperature thresholds, which basically tally with the field geophysical prospecting results.

关键词： Underground coal gasification (UCG) Temperature distribution Laplace transform Envelope curve Burnt surrounding rock Coking cycle

Facile synthesis of azobenzene-embedded conjugated macrocycles for optically switchable single-crystal transistors and tunable supramolecular assemblies

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Aggregate 2023年第6期4卷 101-109页

作者： Dongdong Chang Xuetao Xiao Dongyue An Rong Zhang Xianyu Song Yunqi Liu Yan Zhao xuefeng lu Department of Materials Science State Key Laboratory of Molecular Engineering of PolymersFudan UniversityShanghaiChina Key Laboratory of Water Environment Evolution and Pollution Control in Three Gorges Reservoir School of Environmental and Chemical EngineeringChongqing Three Gorges UniversityChongqingChina

A series of newπ-conjugated macrocycles(AzoM-n-E,n 1–3)incorporating=azobenzene units have been synthesized by a facile strategy in one-pot *** resultant azobenzene-embedded macrocycles feature intrinsic photoresponsive behaviors and intriguing supramolecular assembling *** smallest macro-cycle AzoM-1-E with a rigid planar conjugated backbone structure is used to prepare the single crystal transistors,showing reversible optical *** moderate size macrocycle AzoM-2-E assembles into a dimer in the form of interpenetration throughπ-πstacking between azobenzene *** largest macrocycle AzoM-3-E with enhancedﬂexibility can adaptively assemble with various types of electron-deﬁcient guests accompanied by distortion of ***,AzoM-3-E assembles with the planar F4-TCNQ to form a tetragonal geometry by C-F⋅⋅⋅π and π-π interactions,while the assembly with ellipsoidal C70 viaπ-πinteractions induces AzoM-3-E to form a boat-shaped *** work will shed new light on the development of functional conjugated macrocycles in organic electronics.

关键词： azobenzene conjugated macrocycle host-guest interaction photoresponsive transistors supramolecular assembly

Structural insights into the catalytic mechanism of aldehyde-deformylating oxygenases

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Protein & Cell 2015年第1期6卷 55-67页

作者： Cheniun Jia Mei Li Jianjun Li Jingjing Zhang Hongmei Zhang Peng Cao Xiaowei Pan xuefeng lu Wenrui Chang National Laboratory of Biomacromolecules Institute of Biophysics Chinese Academy of Sciences Beijing 100101 China Key Laboratory ofBiofuels Shandong Provincial Key Laboratory of Energy Genetics Qingdao Instituie of Bioenergy and Bioprocess Technology Chinese Academy of Sciences Qingdao 266101 China University of Chinese Academy of Sciences Beijing 100049 China

The fatty alk（a/e）ne biosynthesis pathway found in cyanobacteria gained tremendous attention in recent years as a promising alternative approach for biofuel production. Cyanobacterial aldehyde-deformylating oxygenase （cADO）, which catalyzes the conversion of Cn fatty aldehyde to its corresponding Cn-1 alk（ale）ne, is a key enzyme in that pathway. Due to its low activity, alk（a/e）ne production by cADO is an inefficient process. Previous biochemical and structural investi. gations of cADO have provided some information on its catalytic reaction. However, the details of its cata- lytic processes remain unclear. Here we report five crystal structures of cADO from the Synechococcus elongates strain PCC7942 in both its iron-free and iron-bound forms, representing different states during its catalytic process. Structural comparisons and functional enzyme assays indicate that Giu144, one of the iron-coordinating residues, plays a vital role in the catalytic reaction of cADO. Moreover, the helix where Glu144 resides exhibits two distinct conformations that correlates with the different binding states of the di-iron center in cADO structures. Therefore, our results provide a structural explanation for the highly labile feature of cADO di-iron center, which we pro- posed to be related to its low enzymatic activity. On the basis of our structural and biochemical data, a possible catalytic process of cADO was proposed, which could aid the design of cADO with improved activity.

关键词： aldehyde-deformylating oxygenase di-ironcenter crystal structure catalytic mechanism alk(a/e)neproduction

Two-Year Observation of Fossil Fuel Carbon Dioxide Spatial Distribution in Xi’an City

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Advances in Atmospheric Sciences 2020年第6期37卷 569-575页

作者： Xiaohu XIONG Weijian ZHOU Shugang WU Peng CHENG Hua DU Yaoyao HOU Zhenchuan NIU Peng WANG xuefeng lu Yunchong FU State Key Laboratory of Loess and Quaternary Geology Institute of Earth EnvironmentChinese Academy of SciencesXi'an 710061China Shaanxi Key Laboratory of AMS Technology and Application Xi'an AMS CenterXi'an 710061China Xi’an Jiaotong University Xi’an 710049China Chinese Academy of Sciences Center for Excellence in Quaternary Science and Global Change Xi’an 710061China. Open Studio for Oceanic-Continental Climate and Environment Changes Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China

The need for atmospheric carbon dioxide(CO2)reduction in the context of global warming is widely acknowledged by the global scientific *** fuel CO2(CO2ff)emissions occur mainly in cities,and can be monitored directly with radiocarbon(14 C).In this research,annual plants[Setaria viridis(L.)Beauv.]were collected from 26 sites in 2013 and2014 in the central urban district of Xi’an ***△14C content of the samples were analyzed using a 3 MV Accelerator Mass Spectrometer,and CO2ff concentrations were calculated based on mass balance *** results showed that the CO2ff mixing ratio ranged from 15.9 to 25.0 ppm(part per million,equivalent toμmol mol-1),with an average of 20.5 ppm in *** range of measured values became larger in 2014,from 13.9 ppm to 33.1 ppm,with an average of 23.5 *** differences among the average CO2ff concentrations between the central area and outer urban areas were not statistically *** the year-to-year variation of the CO2ff concentration was significant(Plue observed in the northeast corner of the ***2 ff emiissions from vehicle exhaust and residential sources appeared to be more significant than two thermal power plants,according to our observed CO2 ff spatial *** variation of pollution source transport recorded in our observations was likely controlled by southwesterly *** results could assist in the optimal placement of regional CO2 monitoring stations,and benefit the local government in the implementation of efficient carbon emission reduction measures.

关键词： pollution Spatial northeast