查询词典 in the presence of

In the presence of a catalyst, ethyl silicate was mixed with ethanol-water solution to form silica sol, which was impregnated into Alnus nepalensis and Tilia amurensis wood as soon as possible.

文章摘要：在催化剂存在下，使正硅酸乙酯与乙醇-水溶液混合制备硅醇溶胶，迅速将其分别注入到西南桤木和紫椴木材中，令其在室温下反应100min左右得到木材-凝胶，然后采用超临界干燥技术制备木材-SiO2气凝胶。

In this sense, IDA plays dual effects, tridentate chelating to Cu(2) and bridgebetween 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.

通过电泳实验研究了一系列金属配合物与pBR322DNA的作用，发现在Tris-HCl缓冲溶液中，生理条件下，镍、锰配合物在共反应物H_2O_2存在下能够很好的断裂DNA，而Zn配合物单独作用就能够使DNA由ccc型转化为oc和linear型。

HOLAH D G%HUGHES A N%HUI B C Reduction of Co with NaBH4 in the presence of triphenylphosphine 10.1139/v78-135 Canadian Journal of Chemistry , 1978,null

孙震%赵振东%李冬梅%刘先章金合欢醇羟基的溴取代反应研究林产化学与工业， 2004，z1

The effect ofmagnesium trisilicate on absorbing tetracycline and its effect in the presence of somesurfactants and citric acid in vivo have also been studied by usng the data ofurinary excretion.

实验结果表明：三硅酸镁的吸附能力随介质 pH 的高低而增减。月桂醇硫酸钠和枸橼酸在体外对三硅酸镁有明显的解吸作用，而 Brij-35的解吸作用不明显。

You feel shy and unconfident about your English in the presence of strangers.

在陌生人面前你觉得胆怯，对自己的英语没有自信。

Concentrated emulsion polymerization of styrene in the presence of two polymerizable surfactants, sodium undecylenic acid and newly synthesized CS-1 was carried out.

在苯乙烯的浓乳液聚合体系中，考察了两种可聚合的表面活性剂十一烯酸钠和新近合成的阴离子型羧酸盐类的表面活性剂CS-1的聚合行为。

To keep our faces toward change, and behave like free spirits in the presence of fate, is strength undefeatable.

昂首面向变局，让我们行动如同自由的灵魂，不屈服於命运，以成就永不挫败的力量。

A robust adaptive control scheme was proposed for a class of nonlinear systems in the presence of unknown parameters and unmodeled dynamics. The whole design was divided into two steps.

针对一类含有不确定参数和未知扰动的非线性系统，提出一种鲁棒自适应控制方法以确保系统输出稳定地精确跟踪给定的参考信号。

In the second part of this dissertation, the oxidation reaction of veratryl alcohol catalyzed by ligninase in the presence of surfactant have been first studied by spectrophotometric technique.

本论文的第二部分工作就是以藜芦醇的氧化反应为指示反应，首次就表面活性剂对木素过氧化物酶的头基效应以及非离子表面活性剂存在下酶促反应动力学和过氧化氢抑制动力学展开了研究。

When the spine is focally kyphotic, particularly when there is a fixed kyphosis, or in the presence of anterior compression from a disc protrusion or spondylotic bar at 1 or 2 segments, an anterior surgical decompression (vertebrectomy or multiple discectomies) is indicated.19 Fusion and stabilization by means of an anterior strut and plate is also supported.27

当颈椎处于明显的后凸，尤其是僵硬性后凸，或者颈髓压迫来自前方的1到2个节段的突出椎间盘或椎间关节时，经过前方入路进行减压（椎体切除或多节段椎间盘切除）是合适的。融合固定的方法包括前方支撑和钉板系统固定。

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