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Relationship between state transition and photoinhibition of photosynthesis in wheat leaves

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chinese Science Bulletin 1997年第21期42卷 1839-1843页

作者： Tan, XX Xu, DQ shen, YG Shanghai Med Univ Shanghai Inst Plant Physiol Shanghai 200032 Peoples R China

IT is well known that state transitions can keep even distribution of excitation energy betweenthe two photosystems (PS Ⅱ and PS Ⅰ), favoring efficient operation of the photosyntheticapparatus. However, state transitions are usually thought to be associated with low light con-ditions. Its physiological significance under high light conditions is still a controversial is-suc. Many people think that state transitions occur and take significant effect only under

关键词： state transition photoinhibition alleviation.

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高热流密度均温板的传热特性实验研究

工程热物理学报 2008年第2期29卷 317-319页

作者：莫冬传吕树申金积德中山大学化学与化学工程学院广东广州510275 常熟市睿镭电子科技有限公司江苏常熟215523

针对目前严峻的电子组件散热形势,制造了高热流密度传热组件—均温板,并对其传热特性进行了研究.实验表明该均温板可承受非常高的热流密度.当加热功率达到170W时,热流密度超过了40W/cm^2,均温板的上底面最高温度不超过85℃,从而表现出... 详细信息

针对目前严峻的电子组件散热形势,制造了高热流密度传热组件—均温板,并对其传热特性进行了研究.实验表明该均温板可承受非常高的热流密度.当加热功率达到170W时,热流密度超过了40W/cm^2,均温板的上底面最高温度不超过85℃,从而表现出良好的均温和散热特性。热阻随加热功率的增大而减小,并逐渐趋于平缓。

关键词：高热流密度均温板传热实验研究

A conserved structural motif shared by EIAV gp90 and HIV gp120

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chinese Science Bulletin 2005年第20期50卷 2393-2394页

作者： LI Huiguang TONG Xiao shen Tao shen Rongxian ZHANG Xiaoyan SHAO Yiming Department of Research on Virology and Immunology National Center for AIDS/STD Control and Prevention CDC Beijing 100052 China Wuhan Institute of Virology Chinese Academy of Sciences Wuhan 430071 China Department of Research on EIAV Harbin Veterinary Research Institute Harbin 150001 China

Both HIV and EIAV belong to the retroviridae family and lentivirus genus. They share considerable simi- larity at gene structural and component level. Hotzel pro- posed that two variable regions and surrounding amino acids of EIAV gp90 might adopt the same topology as V1, V2 and bridging sheet of HIV gp120. These regions map to V3, V4 and surrounding amino acids of EIAV gp90. Based on this proposal, we further analyzed the distribution profile of N-glycosylation site and linear epitope for EIAV gp90 and HIV gp120 at these regions. Our results demonstrated that EIAV gp90 and HIV gp120 are highly similar at these two aspects. Most likely, V3, V4 and surrounding amino acids of EIAV gp90 adopt the same topology structure as V1, V2 and bridging sheet of HIV gp120.

关键词： HIV 爱滋病病毒传染病传播途径基因结构

Self-assembly and tunable optical properties of intramolecular charge transfer molecules

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Aggregate

Aggregate 2020年第1期1卷 57-68页

作者： Han shen Yongjun Li Yuliang Li Beijing National Laboratory for Molecular Sciences(BNLMS) CAS Research/Education Center for Excellence in Molecular SciencesCAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijingP.R.China University of chinese Academy of Sciences BeijingP.R.Chin

Crystalline aggregates formed by self-assembly of organic small molecules have aroused intensive attention in many fields due to their controllable morphologies and *** advantages of intramolecular charge transfer(ICT)compounds endow them with the ability to self-assemble into diverse dimensional crystalline microstructures,as potential candidates for advanced materials and smart miniatures in practical *** this review,the recent progresses of selfassembled microstructures of functional ICT molecules in our group for a decade are *** factors influencing the fabrication of the microstructures in solvent-involved processes are fully *** optical properties induced by self-assembly behaviors are also *** try to give an outlook of structureproperty relationships in functional microstructure engineering and clarify the crucial issues to be addressed in the future scientific research.

关键词： charge transfer assembly

A new approach for determination of component number in chemical system:Subspace comparison

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chinese Science Bulletin 2000年第15期45卷 1368-1373页

作者： Hailin shen Xiaoning Li Yizeng Liang Hunan Univ Coll Chem & Chem Engn Changsha 410082 Peoples R China

A new approach is proposed to determine component number in mixture. In this procedure, base vectors of measurement matrix are extracted by two methods respectively. The discrepancy between subspaces spanned by two sets of base vectors is measured. Examples in this note show that the proposed procedure can correctly determine the number of components for systems even with very similar spectral profiles. It is applied in the study of the self-association behavior of alcohol in CCI4.

关键词： determination of component number subspace discrepancy alcohol association.

Evidence for Himalayan remagnetization in Tarim Basin

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chinese Science Bulletin 2002年第8期47卷 624-631页

作者： FANG Dajun shen Zhongyue TAN Xiaodong Department of Earth Sciences Zhejiang UniversityHangzhou 310027China Department of Earth and Environmental Sciences Lehigh UniversityBethlehemPA18015USA

Himalayan remagnetization in the Tarim Basin was found to be widespread in Paleozoic, Mesozoic and Ce-nozoic rocks. Rock magnetism was performed to study the magnetic carriers. The authors believe that tectonic fluid in the Himalayan stage caused the rock remagnetization. The framboidal pyrites in bitumen and hydrocarbon-rich rocks may transform to framboidal magnetite in the later alkali environment, which leads to remagnetization.

关键词： Himalayan remagnetization Tarim.

Proteomics study of the effects of high pigment-1 on plastid differentiation during the ripening of tomato fruits

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chinese Science Bulletin 2014年第13期59卷 1392-1404页

作者： Xue Zhao Feng Han Shihua shen Key Laboratory of Plant Resources Institute of Botany Chinese Academy of Sciences University of chinese Academy of Sciences College of Life sciences Northwest A & F University

The chloroplast-to-chromoplast difference is a highly regulated ***(Solanum lycopersicum)high-pigment mutant hp-1 shows an enhanced accumulation of carotenoids coupled with an increase in the volume and number of ***,how chromoplasts of hp-1 acquire their specific metabolic characteristics is still unclear.A comparison of proteome profiles from plastids at the mature green,breaker,and red stages of tomato fruits showed 45 differentially expressed *** identified proteins fell into six different functional *** results showed that most of the proteins related to the Calvin cycle increased transitorily only at the early breaker stage,and remained unchanged at the early red *** found 18 proteins that were differentially expressed between the wild type and *** abundance of GCPE in chromoplasts of hp-1 was higher than that in the wild ***,we found that heat shock proteins were only present specifically in the mature green stage chromoplasts of hp-1 but not in the wild *** suggested that GCPE and heat shock proteins might play important roles in the accumulation of high carotenoids in ***,our results could be helpful for understandingchloroplast-to-chromoplast differentiation and the function of hp-1.

关键词：蛋白质组学番茄果实成熟过程分化热休克蛋白类胡萝卜素颜料早期阶段

A fluid dynamics route for producing graphene and its analogues

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chinese Science Bulletin 2014年第16期59卷 1794-1799页

作者： Min Yi Zhigang shen Jinyang Zhu Beijing Key Laboratory for Powder Technology Research & Development Beijing University of Aeronautics and Astronautics Ministry-of-Education Key Laboratory of Fluid Mechanics Beijing University of Aeronautics and Astronautics State Key Laboratory for Turbulence & Complex Systems Peking University

A novel fluid dynamics route for scalable and efficient production of graphene and its analogues is *** force microscopy and transmission electron microscopy analyses strongly suggest that the bulk layered materials(graphite,BN,MoS2,and WS2)are efficiently exfoliated into individual layers containing mono-and few-layer *** fluid dynamics analysis indicates that multiple fluid dynamics events are responsible for efficient *** and pressure release can generate normal force for *** velocity gradient-induced viscous shear stress,the turbulence-induced Reynolds shear stress,and shear effects stemmed from turbulence and flow channel-induced collisions can generate lateral force for exfoliation,resulting in theses bulk layered materials self-exfoliation down to single or few layers through their intrinsically lateral self-lubricating ability.

关键词：流体动力学类似物石墨生产透射电子显微镜分析原子力显微镜层状材料剪切应力

Characterization of an endo-1,4-β-glucanase from Lilium longiflorum that functioned in pollen germination and pollen tube growth

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chinese Science Bulletin 2008年第5期53卷 739-745页

作者： shen MouHua CAO QingQin LI YiQin Department of Biological Sciences and Biotechnologies Tsinghua University Beijing 100084 China Department of Biotechnology Beijing University of Agriculture Beijing 102206 China

Endo-β-glucanases play vital roles in the regulation of pollen tube growth. Here, a previously identified endo-1,4-β-glucanase from Lilium longiflorum (lily), named LlpCel1, was expressed in Escherichia coli, purified, and further investigated for its physiological function. The recombinant LlpCel1 protein hydrolyzed carboxy-methylcellulose (CMC) and exhibited activity towards laminarin from Eisenia. arborea and 1,3:1,4-β-glucan of barley. The pH for the optimum activity was 6.0 and the value of Km calculated from CMC was 5.0 mg/mL. Adding EDTA resulted in the total loss of the enzymatic activity, and this effect could be restored by the addition of Ca2+. Western blotting analysis showed that LlpCel1 protein was present in pollen grains and rehydrated pollen grains, and the amount of the protein was increased during pollen germinating, but not in the pollen tube. Consistently, the immunofluorescence labeling study with the antibody against LlpCel1 also indicated the presence of LlpCel1 at the begin-ning of germination, but not in the elongating pollen tube. Furthermore, incubation of LlpCel1 with pollen at the beginning of pollen germination increased the germination percentage and the length of pollen tube. All of these results suggested that LlpCel1 could play an important role in the regulation of lily pollen germination and the initiation of pollen tube growth.

关键词：葡聚糖酶纤维素酶百合属植物花粉萌发花粉管生长