( 2 ) the kind and proportion of chelating agent have great influence on quality of thin film and chelating agent with small molecule is preferably for thin film preparing ( 2 )络合剂的种类和加入量对薄膜形态有很大影响，薄膜制备对络合剂的要求是在良好络合性能的基础上要有尽量低的分子量。
Several problems about the chemical speciation of heavy metals in chinese traditional medicines , the choice of apriate chelating agent and the mechanism of supercritical chelating extraction are put forward and the development directions are suggested 提出了有关于中药中微量重金属的化学形态、寻找合适的配合剂、超临界条件下配合萃取本身的机理等几个目前存在的问题，并对今后的研究趋势进行了展望。
Speciation analysis of heavy metals in chinese traditional medicines relation between existing speciating of heavy metals and chelating extraction concept of supercritical chelating extraction , choice and recovery of chelating agent affecting factors chelating extraction are introduced 介绍了中药中重金属的形态分析方法、重金属的存在形态与配合萃取的关系、超临界配合萃取的原理、配合剂的选择和回收利用、配合萃取过程的影响因素等。
This article describes that the problem of stabile disposing heavy metal waste and the merit of disposing the heavy metal waste by chelating agent , and especially discusses the application of chelating agents in disposing heavy metal wastes from four aspects : treating in fly ash , treating in sludge , treating in chromium waste and remedying in contaminated soil 摘要论述了重金属废物稳定化处理存在的问题和螯合剂处理重金属废物的优点，着重从4个方面讲述了螯合剂在焚烧飞灰、污泥、铬渣处理以及在修复土壤污染方面的应用。
The recombinants were constructed by transforming ppic9 a - xynb into p . pastoris gs115 . the assay results revealed that the xylanase gene xynb was overexpressed and secreted effectually in p . pastoris . in 3l fermentor the expression level of xylanase xynba exceeded 1200iu / ml and the expressed xylanase had normal bioactivity . the molecule weight of xynba was determined as about 31kd which is higher than 23kd of original enzyme xynb from streptomyces olivaceoviridis a1 . xynbb was gotten by deglycasylation of xynba , whose molecule weight returned to 23kd . we comparised the enzymatic properties of xynba expressed in p . pastoris , xynbb deglycasylated from xynba and xynb produced from streptomyces olivaceoviridis al : there was little difference among the three enzymes on optimal ph , the optimal ph of xynb and xynba were both 5 . 2 , the optimal ph of xynbb was 5 . 0 ; the optimal temperature of xynb and xynba were both 60 c , while the optimal temperature of xynbb was 50 ? ; because of glycosylation the thermal stability of xynba was better than xynb and xynbb ; the specific activity of xynba and xynbb were 883 . 88iu / mg and 832 . 5hu / mg respectively , which were both lower than 2814 . 45iu / mg of xynb ; the km values of xynb and xynba were similar to each other which were 21 . 56 ( g / kg ) and 20 . 87 ( g / kg ) , while the km value of xynbb was 27 . 10 ( g / kg ) ; the fmax of xynba and xynbb were 4568umol / mg . min and 5329umol / mg . min respectively which were lower than 27623 umol / mg . min of xynb ; additionally all of the three enzymes did not display cellulase activity . they all had well resistance to pepsion and trypsin , and were not sensitive to metal iron , surface active agent and chelating agent . the analysis of different xylans enzymatic hydrolysate revealed : by xynba , that the main constitutions of enzymatic hydrolysate of birch wood xylans were xylotriose and xyloquaiose , which account for 68 . 43 % and 16 . 50 % respectively , additionally there was 11 . 79 % of xylobiose ; the main constitutions of enzymatic hydrolysate of corncobs xylans were xylobiose and xylotriose , which account for 81 . 78 % and 11 . 55 % . the result indicated that this xylanase was a kind of 1 , 4 - b - d - xylanohydrolase and was fit to used in industrial procession of xylooligosacc harides 进一步对xynba进行了脱糖基化处理得到xynbb ,其分子量恢复到23kd ，证明xynba是糖基化蛋白。通过对毕赤酵母重组表达的木聚糖酶xynba 、脱糖基化的木聚糖酶xynbb以及橄榄绿链霉菌a1所产原酶xynb之间酶学性质的比较发现：三种酶的最适ph差异不大， xynb和xynba均为5 . 2 ， xynbb为5 . 0 ； xynb和xynba的最适温度均为60 ， xynbb降为50 ：在耐热性上， xynba由于糖基化作用热稳定性明显高于未糖基化的xynb和xynbb ； xynba和xynbb的比活性分别为883 . 88iu mg和832 . 51iu mg ，明显低于原酶的比活2814 . 45iu mg ； xynb和xynba的km值相当，分别为21 . 56 ( g kg )和20 . 87 ( g kg ) ，而xynbb的km值较大为27 . 10 ( g kg ) ； xynba和xynbb的vmax相差不大，分别为4568 mol mg ? min和5329 mol mg ? min ，明显低于xynb的27623 mol mg ? min此外三种酶均无纤维素酶活性，对胃蛋白酶和胰蛋白酶有很好的抗性，且对作用环境中的各种离子、表面活性剂、螯合剂不敏感。通过对不同木聚糖的酶解产物的糖份分析发现：以桦木木聚糖为底物时，酶解产物主要为木三糖和木四糖，含量分别为68 . 43和16 . 50 ，另外还含有11 . 79的木二糖；以玉米芯木聚糖为底物时，酶解产物主要为木二糖和木三糖，含量分别为81 . 78和11 . 55 。
A study on the synthesis , structure and performance of linio2 - based compounds as cathode materials for lithium ion batteries was carried out systemically and in detail in this dissertation . as the first step of this study , a sol - gel method using citric acid as a chelating agent was developed . the reaction conditions in sol - gel process , pre - calcination process and calcination process , especially sintering temperature and sintering time in calcinations process , were analyzed and optimized carefully 本文采用多种结构分析、表面分析、热分析和电化学研究方法和实验手段，从合成方法、结构特征、电化学性能、热稳定性和贮存性能等多方面对锂镍氧系列电极材料进行了系统深入的研究，制备出性能良好的锂镍氧系列电极材料，解释了钛的掺杂对电极材料的作用机理，揭示了锂镍氧系列电极材料的贮存失效机理，并借鉴和发展了rietveld结构精修方法和tpd - ms技术在锂离子电池电极材料研究中的应用。
