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MDA content, cell division , he activities of NR, CAT, POD and SOD of Pistia sagittifolia and Myriophyllum Spicatum with heavy metal,s ion concentration to appear a trend of ascending firstly and desending secondly . This trend explains that Pistia sagittifolia and Myriophyllum Spicatum on the Toxic Effects have similarities under handing the single Pb2+ and Hg2+. As the range of the concentration which each index is arriving at the maximum is different, this also indicates that there are some differences of the Toxic Effects between Pistia sagittifolia and Myriophyllum Spicatum under handing the single Pb2+ and Hg2

丙二醛含量、脂膜透性、硝酸还原酶活性、过氧化物酶活性、超氧化物歧化酶活性、过氧化氢酶活性随重金属离子浓度的增加呈先升后降趋势，说明在单一Pb2+和Hg2+处理下大薸和穗状狐尾藻毒害效应具有相似性；但各指标到达最大值的浓度范围不同，又说明单一Pb2+和Hg2+处理下大薸和穗状狐尾藻毒害效应具有差异性。

The results showed that the existence of DNA brought some influences to the cyclic voltammagrams of this complex,moreover,such influence increased with the elevated concentration of the complex.The UV spectra also proved that the nicking effect on DNA was enhanced with the concentration increasing of the complex.

实验结果表明，DNA存在时会对配合物的循环伏安曲线发生影响，而且这种影响随配合物浓度的增大而加大；紫外光谱的结果也进一步证明，配合物浓度的增大，对DNA的切断作用越趋明显。

This paper investigated the effects of environmental factors, such as, pH, buffer capacity, the concentration of chloride ions and the concentration of nonaggressive anions, on the crevice corrosion potential E_(cc of Type 304 stainless steel. The E_c was ascertained by galvanodynamic polarization.

本实验主要研究pH 值、缓冲容量、氯离子浓度及其缓冲溶液中其它阴离子浓度等环境因素对304 不锈钢缝隙腐蚀电位的影响，缝隙腐蚀电位由动电位扫描确定。

Although DNA of high concentration might give rise to the quenching of IgG fluoresence, DNA of low concentration had but little effat on the nounal IgG fluormence.

DNA时IgG空间结构影响很小，虽然高浓度的DNA有熄灭IgG分子萤光的作用，但是低浓度DNA对正常人血清IgG的萤光几乎没有影响。

In fluctuating microwave, deposition of diamond films was investigated and some significant results were obtained:1 An appropriate fluctuating microwave can distinctly improve the quality of diamond films, and can grow diamond films almost without microcrystalline graphite.2 Both overlong or overshort bottom duration and overlong or overshort fluctuation period are unfavorable for reduction of non-diamond content. Only moderate ones have optimal effects on it.3 Compared with a smooth microwave, a fluctuating one can reduce the diamond nucleation density slightly.4 In fluctuating microwave, even if a higher CH〓 concentration chosen, diamond films with quality better than that of those deposited at a lower CH〓 concentration and in smooth microwave can be obtained.

在脉动微波下进行了沉积金刚石膜的研究，得到下述结果：1）采用合适的脉动微波，能使金刚石膜的沉积质量显著提高，并能使金刚石膜中的微晶石墨得到几乎完全的抑制。2）过长或过短的平底时间或脉动周期均不利于金刚石膜中非金刚石相碳含量的降低，只有适中的平底时间或脉动周期才有最佳的降低非金刚石相碳含量的效果。3）脉动微波会使金刚石的形核密度有所下降。4）脉动微波下，即使选用较高的CH〓浓度，也能得到沉积质量比在平稳微波下采用较低的CH〓浓度所制备的金刚石膜的沉积质量要明显提高的金刚石膜。

In order to improve the electro-catalytic activity of platinum based catalyst to methanol oxidation, in this thesis, firstly prepare heteropoly acid modified Pt/GC electrode with different concentration by cyclic voltammetry method, and then test the cyclic voltammetry curves individually in vitriolic and methanol solution. The study shows the best concentration for both phosphomolybdic acid and phosphotungstic acid is 1×10~(-3)mol/L. And find the more heteropoly acid modified on electrode, the lower peak-up potential towards methanol because of the existence of oxygenous species.

为了改善铂基催化剂氧化甲醇的催化活性，本论文首先通过循环伏安扫描法制备了不同浓度磷钼酸和磷钨酸修饰的Pt/GC电极，通过研究Pt/GC电极在修饰前后在硫酸溶液中及含甲醇的硫酸溶液中的循环伏安行为发现，磷钼酸和磷钨酸均能在PtRu/C电极上发生氧化还原反应，而且杂多酸修饰浓度对Pt/GC电极氧化甲醇的催化活性有很大影响。

Methods The adsorbing effect of montmorillonite was observed in vitro and the effect of decreasing serum concentration of uric acid was studied on acute hyperuricemia model mice. The concentration of uric acid was measured by the reduction method of phosphotungstic acid.

用离体实验研究蒙脱石对尿酸的吸附作用；用小鼠高尿酸血症模型研究蒙脱石降低血尿酸的作用；用磷钨酸还原法测定尿酸含量。

In electrochemistry, constant voltage and circle voltage-current methods were adopted. The influences of monomer concentration, protonic acid concentration, the kinds of anions and scanning speed on the properties of conducting Polyaniline were investigated.

采用恒电位法和循环伏安法，着重分析了苯胺单体浓度、质子酸浓度以及阴离子种类、扫描速度对电化学合成聚苯胺性能的影响。

The effects of various factors, such as sulfurization time, temperature, sulfurization pressure, the concentration of sulfureted hydrogen, the concentration of hydrogen, granularity of catalyst and so on, are studied.

利用程序升温硫化技术，对负载在不同载体上的Co和Mo系催化剂的硫化过程进行了研究，分析了活性组分Co、Mo在催化剂硫化过程中的形态变化以及催化剂的硫化机理，同时还探讨了载体在催化剂硫化过程中的作用。

On the base of summering the treatment technique of starch wastewater,the treatment technique of high concentration starch wastewater and application of carriers in the biotreatment wastewater were reviewed. Chapter 2:Effect of Latex carrier in biotreatment of high concentration starch wastewater.

本文共分四章：第一章淀粉废水生物处理技术及填料的研究进展总结淀粉废水处理技术的基础上，重点综述了高浓度淀粉废水生物处理技术及填料在生物法处理废水中的应用进展。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷