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Treatments of pyrylium salts with various nucleophilic reagents allows the production of a host of functionalized derivatives.

如果各种亲核试剂与吡喃盐反应，就可制取许多种带官能基的衍生物。

The solid-liquid reaction method was used for the preparation of HPLC aryl-bonded silica gel stationary phases, including 3, 5-dinitrobenzyl, quinolinyl ether and 1, 1'-di(2-naphthol) ether bonded silica gel stationary phases by using N-(β-aminoethy1)-γ-aminopropylmethyldimethoxy silane and 3-glyci-doxypropyl trimethoxylsilane as coupling reagents, respectively.

采用固液相连续反应，以N-－γ-氨丙基甲基二甲氧基硅烷和γ-丙基三甲氧基硅烷为偶联剂，分别制备了二硝基苯甲酰胺基、喹啉醚基和联萘酚醚基三种芳基键合硅胶固定相。

The effects of several complex reagents on the retention behavior of REEs were discussed.

考察了P507/高效液相色谱柱分离稀土元素的性能、色谱参数及不同淋洗剂对稀土元素洗脱效果的影响因素。

The best reaction conditions of the second step was confirmed by the orthogonal experiment. Its yield was 90.5% when the reagents were refluxed for 3.0 h at 120℃.

第一步反应很快，回流30 min即可；通过正交试验得出第二步反应的最佳条件为：反应体系在120℃回流3.0h，产物的产率为90.5%。

The methods provide for contacting derivatized particles with test samples and reagents, removal of excess reagent, washing of magnetic material, and resuspension for analysis, among other uses.

该方法提供用于测试样品和试剂接触衍生颗粒、过量试剂的去除、磁性材料的冲洗、和在其它用途中再悬浮以用于分析。

The conformation model of rhodanine fluorescence reagents was established.

初步建立了若丹宁类荧光试剂的构效关系，为系列若丹宁衍生物的合成提供理论指导。

Results showed that the new type rhodanine ramifications were good performance fluorescence reagents to determine the trace matter by fluorescence analysis.

同时，通过对上述试剂在测定铁、钴、铜、锡和锑时的条件的变化的研究，对这类试剂的分子结构和荧光性能的内在关系作了简要的探讨，讨论了供、吸电子基团对胂酸基偶氮若丹宁类衍生物荧光分析性能的影响。

The relationship between the molecular structure and fluorescence performance of reagents was discussed in brief, and the influence of the electron-supplying and electron-withdrawing groups to the fluorescence performance of carboxylphenylazo rhodanine ramifications was also studied.

简要探讨了分子结构与荧光性能的关系，讨论了供、吸电子基团对羧酸基偶氮若丹宁类衍生物荧光分析性能的影响。

The fourth part: The influence of various active groups on the fluorescence performance of aresenoxylphenylazo rhodanine ramifications was studied systematically to seek the fluorescence reagents of good analysis performance.

第四部分：系统研究了各种活性基团对含胂酸基偶氮若丹宁衍生物荧光性能的影响，以寻求具有优良分析性能的荧光试剂。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。