chelating agent 中文意思是什麼

The main information is followed. 1. a new kind of amino - carboxyl - chelating - agent ( acca ), 1, 2 - bis ( 4 - amino phenoxy ) ethane - n, n - n ', n ' - tetraacetic acid ( 4 - bapta ) was synthesized and characterized by fourier transform infrared spectroscopy, 1h - nuclear magnetic resonance and elements analysis, and its property was also studied

設計併合成了一種新型的氨羧配位劑? ? 4 - bapta ，利用紅外、核茲共振、元素分析等手段對它的結構進行了表徵，並對它的性質進行了研究。

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

介紹了中藥中重金屬的形態分析方法、重金屬的存在形態與配合萃取的關系、超臨界配合萃取的原理、配合劑的選擇和回收利用、配合萃取過程的影響因素等。

Effect of aluminum chelating agent on liver zymogram and on essential elements of rats induced by aluminum

鋁螯合劑對染鋁大鼠肝酶譜及必需元素影響

Monogastric animals, such as pigs and poultry, are not able to utilize phytate phosphorus efficiently, since they have only low levels of phytase activity in their digestive tracts, phytate also acts as an antinutritional agent in monogastric animals by chelating various microelements needed by the animal

由於單胃動物如豬、雞等的消化道中植酸酶活性很低，導致它們無法有效利用植酸磷。同時，植酸也是一種抗營養因子，因為它能螯合許多動物生長所必須的微量元素。

Ptpa chelating agent and its manufacturing

螯合劑及其製造

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

Surface active agents - determination of chelating agent content - titrimetic method

表面活性劑螯合劑含量的測定滴定法

Soaps and detergents. determination of chelating agent content. titrimetric method

肥皂和洗滌劑.螯合劑含量的測定.滴定法

The metallic ion influence, is been easily best at the same time uses the chelating agent

易受金屬離子的影響，最好同時使用螯合劑

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 。

Edta ethylenediamine tetra - acetic acid, a compound that acts as a chelating agent, reversibly binding iron, magnesium, and other positive ions

學名為乙二胺四乙酸，是一種具有螯合作用的化合物，能夠可逆地結合鐵離子、鎂離子以及其他正離子。

The choices of components in the final polishing slurry, specially alkali, surfactant and chelating agent have been discussed

精拋作為拋光過程中的最後一步，精拋的結果決定了硅襯底拋光片質量的好壞。

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

本文採用多種結構分析、表面分析、熱分析和電化學研究方法和實驗手段，從合成方法、結構特徵、電化學性能、熱穩定性和貯存性能等多方面對鋰鎳氧系列電極材料進行了系統深入的研究，制備出性能良好的鋰鎳氧系列電極材料，解釋了鈦的摻雜對電極材料的作用機理，揭示了鋰鎳氧系列電極材料的貯存失效機理，並借鑒和發展了rietveld結構精修方法和tpd - ms技術在鋰離子電池電極材料研究中的應用。

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

提出了有關于中藥中微量重金屬的化學形態、尋找合適的配合劑、超臨界條件下配合萃取本身的機理等幾個目前存在的問題，並對今後的研究趨勢進行了展望。

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。