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The topological configuration and conformational analysis of mRNA in translation

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Chinese Science Bulletin 2002年第5期47卷 384-389页

作者： LIU Shuqun & LIU Ciquankunming Institute of Zoology, Chinese Academy of Sciences, kunming 650223, china modern {4. center, yunnan university, kunming 650091, china kunming Institute of Zoology Chinese Academy of Sciences Kunming China modern biological center Yunnan University Kunming China

The theoretical model construction of mRNA hairpin structure and single-stranded structure as well as the simulation studies on RNA structure determined by the X-ray crystal diffraction and nuclear magnetic resonance revealed that in translation, after mRNA being unfolded into single-stranded structure, its topological configuration was closely correlative with the original hairpin structure. The conformational features of single-stranded mRNA appeared as helical regions alternating with curly regions to different extents, which might exert the influence on the folding of nascent polypeptide by various regulating effects including different translational rates.

关键词： hairpin structure of mRNA topological configuration of single-stranded mRNA.

The Nature of Bonding in PtN

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Chinese Chemical Letters 1998年第7期9卷 687-690页

作者： Xiao Guang XIE Xian Jun BI Huai CAO Shu Shan DAI (Modem biological center, yunnan university, kunming 650091)(Department of Chemistry, {4. Normal university, kunming 650092)(Department of Chemistry, yunnan university, kunming 650091) yunnan Univ Modern Biol Ctr Kunming 650091 Peoples R China yunnan Normal Univ Dept Chem Kunming 650092 Peoples R China yunnan Univ Dept Chem Kunming 650091 Peoples R China

The nature of bonding in the title compound has been studed by using CASSCF techniques. The ground state of PtN is found to be (2)Pi state arising primarily from: 1 sigma(2)2 sigma(2)1 pi(4.1 delta(4.3 sigma(2)2 pi(1) configuration, which forms triple bond between Pt and N atoms tone sigma, two pi). The lowest quartet state is (4.Sigma(-) State which has the configuration: ...1 sigma(2)2 sigma(2)1 pi(4.1 delta(4.3 sigma(1)2 pi(2) and lies higher than the ground state by 0.4.eV.

关键词： PtN nature of bonding molcular constants CASSCF

The Nature of Bonding in IrC

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Chinese Chemical Letters 1998年第12期9卷 0-0,0-0页

作者： Xiao Guang XIE Huai CAO (Modem biological center, yunnan university, kunming 650091)Xian Jun BI (Department of Chemistry, {4. Normal university, kunming 650092)Shu Shan Dai (Department of Chemistry, yunnan university, Kunndng 650091) yunnan Univ Modern Biol Ctr Kunming 650091 Peoples R China yunnan Normal Univ Dept Chem Kunming 650092 Peoples R China yunnan Univ Dept Chem Kunming 650091 Peoples R China

The nature of bonding in the title compound has been stUdied by using CASSCF andFOCI techniques. The ground state of IrC has been found to be 2△ arising primarilyfrom:.. 1σ2 2σ2 1π4.1δ3 3σ2 configuration, which forms a triple bond between Ir and C atoms (one σ;two π). The lowest quartet state is 4. state which has the configuration:... 1σ2 2σ2 1π4.1δ3 2π1 3σ2 andlies higher than the ground state by 1 .25eV. The molecular constants of the ground state calculatedat CASSCF level by using Morse's mode are: Re=1.6904., De=4.86eV, We=1139cm-1, andB0=0.5219cm-1 comparable with the spectrum values (Re=1 .6858A, De=6.4. eV, We=1051cm-1and B0=0.5251 cm-1).

关键词： Nature of bonding IrC molecular constants CASSCF

Ab Initio Study of the Excited State Decomposition Reactions of Monothioformic Acid

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Chinese Chemical Letters 1998年第5期9卷 459-461页

作者： Xiao Guang XIE Huai CAO (Modem biological center, yunnan university Kunndng 650091)Xian Jun BI (Department of Chemistry, {4. Normal university kunming 650092)Shu Shan DAI (Department of Chemistry, yunnan university Kunndng 650091) yunnan Univ Modern Biol Ctr Kunming 650091 Peoples R China yunnan Normal Univ Dept Chem Kunming 650092 Peoples R China yunnan Univ Dept Chem Kunming 650091 Peoples R China

The possible excited state decomposition reactions (dehydrogensulfidation, dehydration, and dehydrogenation) of the four tautomers of monothioformic acid have been investigated by ab initio methods with 6-31G** basis sets at the CIS level. The activation energies of the four excited state reactions are 4..57, 4..4., 56.90, 4..73 kcal/mol, and are respectively lower than that of the ground states by 24.52, 24.98, 27.28, and 21.10 kcal/mol.

关键词： monothioformic acid excited state decomposition reaction ab initio

Activation of biomass-derived porous carbon for supercapacitors:A review

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Chinese Chemical Letters 2024年第7期35卷 121-138页

作者： Zixuan Guo Xiaoshuai Han Chunmei Zhang Shuijian He kunming Liu Jiapeng Hu Weisen Yang Shaoju Jian Shaohua Jiang Gaigai Duan Jiangsu Co-Innovation center of Efficient Processing and Utilization of Forest Resources International Innovation Center for Forest Chemicals and MaterialsCollege of Materials Science and EngineeringNanjing Forestry UniversityNanjing 210037China Institute of Materials Science and Devices Suzhou University of Science and TechnologySuzhou 215009China Faculty of Materials Metallurgy and Chemistry Jiangxi University of Science and TechnologyGanzhou 341000China Fujian Provincial Key Laboratory of Eco-Industrial Green Technology Key Laboratory of Green Chemical Technology of Fujian Province UniversityCollege of Ecological and Resources EngineeringWuyi UniversityWuyishan 354300China

Due to the advantages of renewable,low pollution and wide distribution of biomass resources,it is selected as the electrode material for *** carbon-based electrode materials,specific surface area and pore structure have a great *** and summarizing the influence of activation on pore structure will greatly broaden this *** on the activation mechanism of activator,this paper summarizes the latest progress of biomass activation applied to supercapacitors,including traditional physical and chemical activation methods and non-traditional methods such as biological activation method,self-activation method,template assisted activation method and green activator ***,the challenges,strategies and prospects for the future development of biomass-derived carbon material activation are pointed *** summary,this review will help researchers choose appropriate strategies to design biomass-derived carbon electrode materials for supercapacitors,thereby promoting the application of biomass materials.

关键词： Biomass-derived Activation Pore structure Electrochemistry Supercapacitor

Neuroglobin mutation associated with hypoxia adaptation in Tibet chicken

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Progress in Natural Science:Materials International 2007年第12期17卷 1419-1424页

作者： Zhang Lifan1, Liu Chong2, Lian Linsheng3, Zhao Chunjiang1, Bao Haigang1 and Wu Changxin1(1. College of Animal Science and Technology, china Agricultural university, Beijing 100094. china 2. College of biological Science, china Agricultural university, Beijing 100094. china 3. College of Animal Science and Technology, yunnan Agricultural university, kunming 650201, china) College of Animal Science and Technology China Agricultural University Beijing 100094 China College of biological Science China Agricultural University Beijing 100094 China College of Animal Science and Technology Yunnan Agricultural University Kunming 650201 China

Globin protein family plays an important role in storing and transporting oxygen. As a newly reported globin, the revealed function of neuroglobin includes binding and storing oxygen as well as facilitating the utilization of oxygen in neuronal cells. In the present study, mutations in exons of chicken Ngb gene were identified with the method of sequencing and created restriction site PCR in Tibet chicken and other four lowland chicken breeds. The mutations of Lys-2224.E4.-Asn and Ser-2279(E4.-Gly were identified in exon 4.of the gene. The Lys-2224.E4.-Asn mutation existed only in Tibet chicken and the mutation frequencies increased with increasing altitude. Analysis of the haplotype and diplotype of the two mutations in Tibet chicken populations of different altitudes showed that the frequencies of TG haplotype and TTGG diplotype also increased with increasing altitude, while the reverse tendency was found on GGAA diplotype. Under the hypoxic simulation incubation, the main haplotype was TG in living embryos and GA in dead embryos. The results showed that the Lys-2224.E4.-Asn mutation may be a specific mutation associated with hypoxia adaptation in Tibet chicken.

关键词： Tibet chicken neuroglobin hypoxia adaptation Ngb gene mutation.

Stable RNA hairpins in 88 coding regions of human mRNA

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Progress in Natural Science:Materials International 2004年第11期 24-29页

作者： PAN Min 1*, WANG Chuanming 1* and LIU Ciquan 1,2,3**(1. modern biological center, yunnan university,{4., china 2. kunming Institute of Zoology, Chinese Academy of Sciences, kunming 650223, china 3. center for Theoretical Biology, Peking university, Beijing 100871, china) modernbiologicalcenter YunnanUniversityKunming650091China centerforTheoreticalBiology PekingUniversityBeijing100871China

RNA hairpins containing UNCG, GNRA, CUUG (N=A, U, C or G, R=G or A) loops are unusually thermodynamic stable and conserved structures. The structural features of these hairpin loops are very special, and they play very important roles in vivo. They are prevalent in rRNA, catalytic RNA and non-coding mRNA. However, the 5′ C(UUCG)G 3′ hairpin is not found in the folding structure of 88 human mRNA coding regions. It is also different from rRNA in that there is no preference for certain sequences among tetraloops in these 88 mRNA folding structures.

关键词： thermodynamic stability hairpin UNCG GNRA RNA structure.

Assembly and structure of protein phosphatase 2A

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Science china(Life Sciences) 2009年第2期52卷 135-146页

作者： SHI Yi Gong center for Structural Biology, Department of biological Sciences and Biotechnology, and School of Medicine, Tsinghua university, Beijing 100084. china 1. center for Structural Biology Department of Biological Sciences and Biotechnology and School of Medicine Tsinghua University Beijing 100084 China

Protein phosphatase 2A (PP2A) represents a conserved family of important protein serine/threonine phosphatases in species ranging from yeast to human. The PP2A core enzyme comprises a scaffold subunit and a catalytic subunit. The heterotrimeric PP2A holoenzyme consists of the core enzyme and a variable regulatory subunit. The catalytic subunit of PP2A is subject to reversible methylation, medi-ated by two conserved enzymes. Both the PP2A core and holoenzymes are regulated through interac-tion with a large number of cellular cofactors. Recent biochemical and structural investigation reveals critical insights into the assembly and function of the PP2A core enzyme as well as two families of holoenzyme. This review focuses on the molecular mechanisms revealed by these latest advances.

关键词： protein phosphorylation dephosphorylation PP2A structure mechanism

微波场中甲烷部分氧化制合成气 Ⅱ.Co/ZrO_2催化剂在微波场中的升温行为及催化活性

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催化学报 1998年第5期19卷 467-469页

作者： Bi Xianjun 1, Xie Xiaoguang 2, Duan Aihong 1, Wang Zhen 3, Hong Pinjie 3, Dai Shushan 3 (1 Department of Chemistry, yunnan Normal university, kunming 650092 2 modern {4. center, yunnan university, kunming 650091 3 Department of Chemi

近年来，甲烷部分氧化制合成气（ＰＯＭ）的研究一直十分活跃［１，２］．前文报道了用于甲烷部分氧化制合成气的镍基催化剂（Ｎｉ／Ｌａ２Ｏ３）在微波场中的升温行为和催化活性［３］，发现在达到相同的ＣＨ４转化率时，微波活化方式... 详细信息

近年来，甲烷部分氧化制合成气（ＰＯＭ）的研究一直十分活跃［１，２］．前文报道了用于甲烷部分氧化制合成气的镍基催化剂（Ｎｉ／Ｌａ２Ｏ３）在微波场中的升温行为和催化活性［３］，发现在达到相同的ＣＨ４转化率时，微波活化方式下的催化剂床层温度比常规加热低得多...

关键词：微波甲烷合成气钴部分氧化催化剂