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STUDY ON THE IMMOBILIZATION OF pApAIN WITH A MACrOp.r.US BEAD CArrIEr OF COpOLYMEr CONTAINING MONOMEr UNITS OF NAMINOETHYL ACrYLAMIDE AND VINYL ALCOHOI

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Chinese Journal of polymer Science 2000年第1期18卷 25-31页

作者： Yan-feng Li Jun-rong Li Lian-di Fu Yao-zeng Li Dep.r.ment of Chemistry, lanzhou University, lanzhou 730000, china Gansu Natural Energy research institute, lanzhou 730000, china Gansu provincial institute of Drug Control, lanzhou 730000, china 兰州大学甘肃兰州甘肃自然能源所甘肃兰州 730000 甘肃省药检所甘肃兰州 730000

A kind of macrop.r.us bead carrier of copolymer containing monomer units of N-aminoethyl acrylamide and vinylalcohol was synthesized, i.e. the Mr-AA carrier. papain was immobilized on the carrier using glutaraldehyde as the couplingagent. The enzymatic activity of the immobilized papain was comp.r.d with free papain using casein as a substrate, and theeffects of glutaraldehyde concentration, pH, temp.r.ture, time and papain amount added on the activity recovery were alsoinvestigated. The results show that the Mr-AA carrier contains reactive primary amine groups, hydrophilic amido links andhydroxyl groups, as well as macrop.r.us structures based on its matrix (Mr-AV matrix), furthermore, the activity recoveryof papain in the immobilization could reach 48%/～58%. In comp.r.son with free papain, the resulting immobilized papainexhibits a remarkable thermostability and better reusability.

关键词： Immobilization papain proteolytic enzyme Macrop.r.us bead carrier

On adjacent-vertex-distinguishing total coloring of graphs

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Science china Mathematics 2005年第3期48卷 289-299页

作者： ZHANG Zhongfu, CHEN Xiang’en, LI Jingwen, YAO Bing, LU Xinzhong & WANG Jianfang College of Mathematics and Information Science, Northwest Normal University, lanzhou 730070, china Dep.r.ment of Computer, lanzhou Normal College, lanzhou 730070, china institute of Applied Mathematics, lanzhou Jiaotong University, lanzhou 730070, china College of Information and Electrical Engineering, lanzhou Jiaotong University, lanzhou 730070, china institute of Applied Mathematics, Chinese Academy of Sciences, Beijing 100080, china College of Mathematics and Information Science Northwest Normal University Lanzhou China Dep.r.ment of Computer Lanzhou Normal College Lanzhou China institute of Applied Mathematics Lanzhou Jiaotong University Lanzhou China College of Information and Electrical Engineering Lanzhou Jiaotong University Lanzhou China institute of Applied Mathematics Chinese Academy of Sciences Beijing China

In this pap.r. we present a new concept of the adjacent-vertex-distinguishing total coloring of graphs (briefly, AVDTC of graphs) and, meanwhile, have obtained the adjacent-vertex-distinguishing total chromatic number... 详细信息

关键词： graph, proper total coloring, adjacent-vertex-distinguishing total coloring, adjacent-vertex-distinguishing total chromatic number.

Organic geochemical studies of sinking p.r.iculate material in china sea area Ⅱ——Geochemical significance of compositional features of ketone, aldehyde and alcohol compounds

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Chinese Science Bulletin 1997年第22期42卷 1894-1898页

作者： DUAN Yi,CUl Mingzhong, MA Lanhua, SONG Jinming, ZHOU Shixin and LUO Binjie1. lanzhou institute of Geology, Chinese Academy of Sciences, lanzhou 730000, china 2. Earthquake research institute of lanzhou, SSB, lanzhou 730000, china 3. institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, china lanzhou institute of Geology Chinese Academy of Sciences Lanzhou China Earthquake research institute of lanzhou SSB Lanzhou China institute of Oceanology Chinese Academy of Sciences Qingdao China

SINKING p.r.iculate organic matter of the sea plays an imp.r.ant role in marine environment. Itnot only provides food for marine organisms and takes p.r. in chemical cycling, but also pro-vides sedimentary organic matter for marine sediments. Therefore, researchers always payclose attention to the source and processes of transp.r. and transformation of marine sinkingp.r.iculate organic matter. Its transp.r. process can be understood by measuring the

关键词： marine sinking paniculate material composition of lipid compounds organic matter source and biochemical pro-cesses.

Electron Beam Cladding Surface Modification Technology of Niobium Alloy

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稀有金属材料与工程 2011年第S4期40卷 231-234页

作者： He Jun,Wang Shiwei,Zhang Yonghe lanzhou institute of physics,lanzhou 730000,china lanzhou Inst phys Lanzhou 730000 Peoples R China

The electron beam cladding (EBC) is a new high-energy surface modification technology developed *** on the analysis of principles and critical technologies in EBC,effect of technological p.r.meters on the microstructure and prop.r.ies of the cladding layer was *** was pointed out that a rational selection of scanning waveform is greatly significant for EBC ***,the progress had achieved and the problems which need to be resolved were introduced.

关键词： electron beam cladding niobium alloy surface modification

A note on n-edge chromatic number

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Chinese Science Bulletin 1997年第23期42卷 1952-1954页

作者： SUN Liang and ZHANG Zhongfu1. Dep.r.ment of Applied Mathematics, Beijing institute of Technology, Beijing 100081, china 2. institute of Applied Mathematics, lanzhou institute of railway, lanzhou 730070, china Dep.r.ment of Applied Mathematics Beijing Institute of Technology Beijing China institute of Applied Mathematics Lanzhou Institute of Railway Lanzhou China

ALL graphs appearing in this note are simple. A graph with p vertices and q edges will becalled a (p, q )-graph. The maximum degree of G is denoted by Δ(G).Let n≥2 be an integer. The n-edge chromatic number X_n (G) of a simple graph G is theminimum cardinality of a set of colors with which one can assign the colors to the edges of Gsuch that the edges on a path of length less than or equal to n receive different *** aim of this note is to explore the bounds for X’_n (G) and X’_n (G) + X’_n (G). It is

关键词： graph complement n-edge chromatic number.

Mantle-derived rare-gas releasing features at the Tianchi volcanic area, Changbaishan Mountains

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Chinese Science Bulletin 1997年第9期42卷 768-771页

作者： SHANGGUAN Zhiguan and SUN Mingliang1. institute of Geology, State Seismological Bureau, Beijing 100029, china 2. lanzhou institute of Geology, Chinese Academy of Sciences, lanzhou 730000, china institute of Geology State Seismological Bureau Beijing China lanzhou institute of Geology Chinese Academy of Sciences Lanzhou China

TIANCHI volcano,Changbaishan Mountains isthe largest modern active volcano in East *** times strong volcanic erupting activ-ities occurred in the Cenozoic *** vol-canic activities have revived again in the *** investi... 详细信息

关键词： Tianchi volcanic area Changbaishan Mountains mantle-derived rare gas 3He/ 4He 40 Ar/36 Ar 4He/20 Ne 4He/40Ar isotope ratios.

The Nitrogen Components in rFCC Diesel oil

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The Nitrogen Components in RFCC Diesel Oil

Strengthening of the boreal winter Hadley circulation and its connection with ENSO

甘肃省化学会成立六十周年学术报告会暨二十三届年会

作者： Xingguo Cheng~(1,2), Ting Zhao~1, Xingguo Fu~2, Zhide Hu~1(1 Dep.r.ment of Chemistry, lanzhou University, lanzhou 730000, p.r. china 2 lanzhou lube oil r(?)D institute of petrochina, lanzhou 730060. p.r. china)

This pap.r.described a simple method to sep.r.te and identify the nitrogen compounds in rFCC diesel oil. A 2% HSO-CHCHOH solution was used to extract nitrogen compounds from rFCC diesel oil. Then the nitrogen-rich solution was further sep.r.ted to four fractions by a silica gel column liquid-solid chromatography. Two discrete fractions containing neutral and basic nitrogen compounds were identified by ApCI and GC-MS. The results indicated that the nitrogen compounds in rFCC diesel oil were anilines, quinoline, indole, carbazole and their derivatives.

关键词： nitrogen compounds rFCC diesel oil mass spectrometry GC-MS ApCI

来源： cnki会议评论

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cnki会议

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progress in Natural Science:Materials International 2007年第11期17卷 1327-1333页

作者： Ma Jie1,2 and Li Jianping2(1. College of Atmospheric Sciences, lanzhou University, lanzhou 730000, china 2. LASG, institute of Atmospheric physics, Chinese Academy of Sciences, Beijing 100029, china) College of Atmospheric Sciences Lanzhou University Lanzhou 730000 China LASG Institute of Atmospheric Physics Chinese Acad. of Sci. Beijing 100029 China

Emp.r.cal orthogonal function (EOF) analysis is carried out for the year-to-year variability of the boreal winter (DJF) mass stream function of the mean meridional circulation (MMC) during the p.r.od 1948—2005. The results demonstrate that it is dominated by the equatorially asymmetric and symmetric modes. Further analysis shows that the former mode is linked with the boreal winter Hadley cell mainly on the decadal time-scale, and the latter on the interannual time-scale. The asymmetric mode index (AMI) with a clear upward trend contributes to the decadal strengthening of the boreal Hadley circulation, and is closely correlated with the tropical SST warming, especially in the region of Indo-west pacific warm pool (INWp). Furthermore, the AMI also contributes to the abrupt change of the correlation coefficient between the boreal Hadley circulation and ENSO after 1976. The symmetric mode index (SMI) with robust and stable linkage with ENSO shows a significant interannual variability, suggesting that the variability of the Hadley circulation is mainly associated with ENSO on the interannual time-scale.

关键词： the Hadley circulation interannual time-scale decadal time-scale

Exp.r.mental study on high-voltage solar array sustained arc discharge induced by high charging

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Science china(Technological Sciences) 2007年第2期50卷 213-220页

作者： LI Kai1,2, XIE ErQing1, WANG Li2, LIU YanXia1, YANG Yang1, SUN YanZheng3, CUI XinYu3 & MAI ShengLi2 1 School of physical Science and Technology, lanzhou University, lanzhou 730000, china 2 lanzhou institute of physics, lanzhou 730000, china 3 Tianjin institute of power Source, Tianjin 300381, china School of physical Science and Technology Lanzhou University Lanzhou China lanzhou institute of physics Lanzhou China Tianjin institute of power Source Tianjin China

It has been rep.r.ed that sustained arc discharge induced by electrostatic discharge (ESD) could cause p.r.anent damage to high-power and high-voltage solar array of spacecrafts. The pap.r.focuses on ESD simulating exp.r.ments on Si and GaAs samples, and induces sustained arc discharge. The physical mechanism of sustained arc discharge is discussed by comp.r.ng the charging/discharging phenomena between Si and GaAs samples. The exp.r.ments show that sustained arc discharge can produce a p.r.anent short-circuit channel between solar cell strings through which the solar array’s photovoltaic power may flow out sustainedly. The analyses show that sustained arc discharge strongly depends on solar array structure, solar array op.r.ting voltage, ESD characteristics and cell materials. Keywords high-voltage solar array - electrostatic discharge - sustained arc discharge - mechanism Supp.r.ed by the National Laboratory of Vacuum, Cryogenics Technology and physics (Grant No. 51475030504DZ2801), and the National High Technology Development program of china (Grant No. 2002AA732158)

关键词： high-voltage solar array electrostatic discharge sustained arc discharge mechanism