查询词典 catalysis

Sulfuration olefin with high activity had better replenishinge effect than that of zinc dialkyl dithiophosphate whose activity depended on catalysis of temperature.

其中，高活性的硫烯比需要温度催化的ZDDP对硫化层的补充作用更明显。

The chapter 6 makes a study on the design and synthesis of new glycosides, which prepared from imidazole, thiazole and tetrazole aglycones mentioned above and glucose derivatives by phase transfer catalysis under the moderate reaction condition.

我们以合成的新杂环化合物作为糖的配基，用相转移催化法合成了25个糖苷类化合物。其中包括4个咪唑氮糖苷，12个含有噻唑环的糖苷，6个含有噻唑环的糖酯，3个四氮唑糖苷。

In addition a series compounds of thiazole glycosides (17a~17f) were synthesized through 1-benzoyl-3-aryl-thioureas by phase-transfer catalysis method under mild condition.

另外，本文以1-苯甲酰基-3-芳基硫脲为原料通过相转移合成法合成了一系列噻唑类糖苷的衍生物(17a~17f)。

By using IR ,XRD ,TG and ;n-butylamine titrimetry ,the catalysis of heteropolyacidic salt were studied and the its activity may be connected with acidic centre owned by heteropolyacidic salts.

IR、XRD、TG分析和正丁胺滴定法表面酸度测定表明，杂多酸银盐的催化性能与其所具有的酸性中心有关。

Compound 9 is glycosylated in the presence of TMSOTf with rhamose-derived trichloroacetimidates to provide target trisaccharide Saponin 1, oleanolic acid 3-yl-2,4-di-O-a-L-rhamnopyranosyl -p-D-glucopyranosideCoumpond 18 is prepared with oleanic acid and Bromide 11 through phase-thansfer catalysis glycosylation manner.

三糖皂苷Saponin 1是以葡萄糖齐墩果酸皂苷为起始原料，用BBTZ(1-苯甲酰苯并噻唑)选择性保护葡萄糖3′，6′-羟基得到化合物9，然后以化合物9为糖基受体，进行一步糖苷化可以在化合物9的2′，4′-羟基上同时引入两分子鼠李糖，最后脱掉所有的保护基得到目标化合物Saponin1。

In specific acid catalysis, the undissociated acid s do not contribute

在特殊的酸催化中，不离解的酸不起作用。

In specific acid catalysis, the undissociated acids do not contribute.

在特殊的酸催化中，不离解的酸不起作用。

Some suggestions are made to promote more systematic and deeper studies on the unsteady state catalysis and forced period operation of chemical reaction systems with different scales.

为了促进在动态催化和不同尺度化学反应系统强制周期操作方面更系统、深入的研究，提出了若干建议。

In the traditional lactic acid production methods, DL-lactic acid can be synthesized by chemosynthesis method, its cost is too high and its raw materials are venomousness; Optical purity lactate can be produced by Enzyme catalysis. Due to it"s more complicated technology and it"s high demanding for working condition, microbial fermentation has become the important method to produce lactic acid.

传统的乳酸生产方法中，化学合成法所用原料有剧毒，生产成本高：酶法生产乳酸工艺比较复杂，对生产条件要求较高，因此微生物发酵法生产乳酸成为乳酸生产的主要方法。

At the same time , through investigating the catalysis of woodiness active carbon , the results show that it also has good activity in the hydration reaction of EO to EG , but that awaits for further studying.

实验中也对木质活性炭进行了考查，发现其对环氧乙烷水合反应也有很好的活性，有待进一步的研究。

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