硅胶

Methods Combined normal silica pressure column with L-aa-OCH3HCl as chiral pool, four racemic mixtures were synthesized and separated.

利用普通的硅胶加压柱联合L-氨基酸甲酯盐酸盐作为手性衍生化试剂将具有同一结构式的4个外消旋混合物进行了分离。

Methods:Purchased spherical silica particles (5 μm) were refluxed in anhydrous toluene with vinyl-triethoxysilane for 18 h, to modify the surface with vinylsilyl groups.

将商品球形硅胶颗粒(粒径5μm)与乙烯基三乙氧基硅烷通过在无水甲苯中回流18 h，进行硅烷化修饰。

Methods From July 1995 to April 2005, three operative methods, cartilage bracket and retroauricular expanded flap, silicone bracket and retroauricular flap and full-thickness skin grafting,local excision and para-position suture, were employed to treat 11 cases of traumatic partial auricle defects.

1995年7月～2005年4月，分别采用软骨支架+耳后扩张皮瓣、硅胶支架+耳后皮瓣+全厚皮片和局部切除+对位缝合三种术式，治疗外伤性部分耳郭缺损患者11例，分析总结其临床资料。

The literature about the synthesis of the ion exchange and chelating adsorbents used in the off-line separation and preconcentration of the noble metals and the development of the on-line microcolumn separation and preconcentration of the noble metals were reviewed. Four silica gel-based adsorbents with rhodanine, 2-mercaptopyrimidine, 2-mercaptothiazoline and isophenylthiourea as the functional groups were first synthesized and applied to the on-line separation and preconcentration of silver, gold, palladium and platinum for their FAAS determination.

本论文在回顾螯合吸附材料的合成及其在贵金属的离线和流动注射在线预浓集分离发展状况的基础上，首次合成了含罗丹宁、2-巯基嘧啶、2-巯基噻唑啉和异二苯基硫脲等四种以硅胶为载体的螯合吸附剂，并用于银、金、钯和铂的流动注射微填充柱在线预浓集分离、火焰原子吸收光谱分析。

The method comprises: reacting semicarbazide and terephthalaldhydic acid under stirring, and monitoring the end point with silica gel thin layer chromatography to obtain terephthalaldhydic acid semicarbazone.

本发明以氨基脲为原料，在搅拌下与对醛基苯甲酸反应，用硅胶薄层层析法监测反应终点，合成氨基脲缩对醛基苯甲酸。

The results showed that the phosphotungstic had better catalytic activities than the silicotungstic acid. As for the supported HPAs, the silica gel support HPAs' catalytic activities were higher than the activated carbon support HPAs.

实验结果表明：对于非负载型杂多酸催化剂，磷钨杂多酸的催化活性要高于硅钨杂多酸；对于负载型杂多酸催化剂，硅胶负载杂多酸催化剂的催化活性要高于活性炭负载的杂多酸催化剂。

The silanol groups of silica, is reacted with various silane reagents to produce covalently bound silyl derivatives covering a varying number of active sites on the surface of the support.

担体的表面，如，硅胶的硅烷醇基团，和不同的甲硅烷试剂反应制备共价键甲硅烷基衍生物，此衍生物在担体表面覆盖了许多不同的活性点。

This paper compared two kinds of rose families sorbus of different effective spots of total flavonids content. We get a better process of total flavonoids abstraction from the branch of Sorbus tianschanica,.Under the best process of total flavnoids ,two flavnoids were isolated from them. Preliminary affirmed two kinds of compounds belong to flavanone, two kinds of structure just substituent had a dissimilarity separately. This thesis was a part of a national natural science fund to subsidize.

除此，本论文还对新疆天山花楸的枝干总黄酮的提取工艺进行了研究，得到了最佳提取工艺，在最佳提取工艺的条件下对新疆天山花楸的枝干进行了系统的提取和硅胶柱层析，得到两种化合物，初步认定两种化合物属于二氢黄酮类，两种化合物的结构相似，只是个别取代基有所不同，本论文是国家自然科学基金资助项目。

MKF polystyrene-divinylbenzeneC18(MKF-PS-C18) reversed phase stationary was prepared by treating corresponding microspheres of uniform diameter with stearyl chloride and characterized with infrared spectra,loading capacity and separation performance.

比较了MKF-PS-C18基质与硅胶基质在有机相和水梯度条件下的色谱柱压性能。

A theoretical study of the surface structure of silica-supported zirconium sulfate tetrahydrate with high catalytic activity for synthesis of 2-ethoxyethyl acetate has been investigated using the ASED-MO method (including atomic repellent energy).

采用量子化学ASED-MO(含原子对排斥的EHMO法)为基础的结构自动优化EHTOPT法研究了硅胶负载型硫酸锆表面相的结构特征。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。