metal chelating 中文意思是什麼

In this sense, ida plays dual effects, tridentate chelating to cu ( 2 ) and bridge between two cu ( 1 ) andcu ( 2 ). 3 metal complexes were selected as the appropriate for the study of cleavage plasmid pbr322dna by gel electrophoresis technique. the results showed ni and mn complexes could cleave effect - ively dna in the presence of h2o2 at physiological ph and temperature, whereas individual zn complex could cleave effectively dna

通過電泳實驗研究了一系列金屬配合物與pbr322dna的作用，發現在tris - hcl緩沖溶液中，生理條件下，鎳、錳配合物在共反應物h _ 2o _ 2存在下能夠很好的斷裂dna ，而zn配合物單獨作用就能夠使dna由ccc型轉化為oc和linear型。

The development of heavy metal chelating agent in treating with hazardous waste

重金屬螯合劑處理危險廢物的研究進展

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

進一步對xynba進行了脫糖基化處理得到xynbb ，其分子量恢復到23kd ，證明xynba是糖基化蛋白。通過對畢赤酵母重組表達的木聚糖酶xynba 、脫糖基化的木聚糖酶xynbb以及橄欖綠鏈黴菌a1所產原酶xynb之間酶學性質的比較發現：三種酶的最適ph差異不大， xynb和xynba均為5 . 2 ， xynbb為5 . 0 ； xynb和xynba的最適溫度均為60 ， xynbb降為50 ：在耐熱性上， xynba由於糖基化作用熱穩定性明顯高於未糖基化的xynb和xynbb ； xynba和xynbb的比活性分別為883 . 88iu mg和832 . 51iu mg ，明顯低於原酶的比活2814 . 45iu mg ； xynb和xynba的km值相當，分別為21 . 56 （ g kg ）和20 . 87 （ g kg ） ，而xynbb的km值較大為27 . 10 （ g kg ） ； xynba和xynbb的vmax相差不大，分別為4568 mol mg ? min和5329 mol mg ? min ，明顯低於xynb的27623 mol mg ? min此外三種酶均無纖維素酶活性，對胃蛋白酶和胰蛋白酶有很好的抗性，且對作用環境中的各種離子、表面活性劑、螯合劑不敏感。通過對不同木聚糖的酶解產物的糖份分析發現：以樺木木聚糖為底物時，酶解產物主要為木三糖和木四糖，含量分別為68 . 43和16 . 50 ，另外還含有11 . 79的木二糖；以玉米芯木聚糖為底物時，酶解產物主要為木二糖和木三糖，含量分別為81 . 78和11 . 55 。

Chelating and detoxification metal ions are also the focus of many researchers. according to lewis soft - hard acid - base theory, aluminum is the hardest trivancy lewis acid, and polyphenols are lewis base theoretically, they can combine together tightly

根據lewis軟硬酸堿理論，鋁是三價金屬離子中最硬的lewis酸，而多酚類卻是lewis堿（電子對供體，親核體） ，兩者可以很好的結合。

Study on the adsorption properties of new chelating fiber for heavy metal ions

新型螯合纖維對重金屬離子吸附性能的研究

Preparation of chelating fiber containing dzs and its adsorption to heavy metal ion

載雙硫腙螯合纖維制備及富集重金屬離子研究

Interaction of heavy metal ions and chelating ion - exchange resin containing 8 - hydroxyquinoline

羥基喹啉螯合樹脂與重金屬作用研究

The main mechanisms of earthworms ' resistance to metal pollutants are also elaborated : ( 1 ) its lipid antioxidative enzyme system helps relieve the stress of oxidation ; ( 2 ) compartment and immobilization of metals ; ( 3 ) process of chelating and detoxicification ; ( 4 ) lysosome and cellular plasmid are activated to restrain activity of heavy metals

並闡述了蚯蚓對重金屬的主要耐性機制： （ 1 ）脂質過氧化保護酶系統緩解氧化脅迫； （ 2 ）分隔、固定作用； （ 3 ）螯合解毒作用； （ 4 ）溶酶體和細胞質粒抑制重金屬活性。

Purification and renaturation of recombinant human cu, zn - sod by metal - chelating affinity chromatography

金屬螯合親和層析純化和復性重組人銅鋅超氧化物歧化酶

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

摘要論述了重金屬廢物穩定化處理存在的問題和螯合劑處理重金屬廢物的優點，著重從4個方面講述了螯合劑在焚燒飛灰、污泥、鉻渣處理以及在修復土壤污染方面的應用。