硅胶

We investigated constituent of triterpenoid saponins ofAlbizzia, two new compounds together with two known compounds were isolated from Albizzia julibrissin Durazz. by using column chromatography (macroreticular resin, silica gel, Sephadex gel, reverse phase silica gel),preparative HPLC methods et al.On the basis of spectroscopic analysis, including IR,ESI-MS,~1H-NMR,~(13)C-NMR,HMBC,HMQC,~1H-~1HCOSY and chemical methods, the structure of two new compounds were identified as 3 - O -[β-D-xylopyranosyl(1→2)-β-D-fucopyranosyl (1→6)-β- D -2- deoxy - 2 - acetoamidoglucopyranosyl] -21-O-[(6S)-2- trans- 2,6-dimethyl - 6 - O-β- D - quinovopyranosyl -2,7- octadienoyl] - acacic acid- 28 - O-β-D-glucopyranosyl(1→3)[α-L-arabinofuranosyl(1→4)]-α-L-rhamnopyranosyl(1→2)-β-D-glucopyranoside acacic acid 3- O -β- D- glucopyranosy(1→3)-β- D- fucopyranosl(1→6) [β-D- xylopyranosyl (1→2)]-β-D-glucopyranoside ;two known compounds were acacic acid lactone 3- O -β-D- xylopyranosyl-(1→2)-β-D-fucopyranosl (1→6)- 2-deoxy -2 -acetoamido -β-D- glucopyranoside ; acacic acid lactone 3- O-β-D-xylopyranosyl(1→2)-α-L- arabinopyranosl (1→6)- 2- deoxy - 2- acetoamido -β-D-glucopyranoside . The study lays chemical foundation and chemical reference substance for enhancing quality standard of Albizzia julibrissin Durazz.

本研究论文在综述国内外对合欢属Albizzia三萜皂苷化学成分和药理作用研究进展的基础上，利用传统植化分离手段和现代分离技术，包括大孔树脂、硅胶、葡聚糖凝胶、反相硅胶等柱色谱，制备高效液相色谱法等技术从中药合欢皮中分离得到了4个化合物，其中，2个新化合物和2个己知化合物，并进一步通过现代分析技术IR，ESI-MS，~1H-NMR，~(13C-NMR，HMBC，HMQC，~1H-~1HCOSY等和化学方法鉴定了2个新化合物的结构分别是：3-O-[β-D-吡喃木糖基(1→2)-β-D-吡喃夫糖基(1→6)-β-D-2-去氧-2-乙酰氨基吡喃葡萄糖基]-21-O-[(6S)-2-反式-2，6-二甲基-6-O-β-D-吡喃鸡纳糖基-2，7-辛二烯酸基]-金合欢酸-28-O-α-L-呋喃阿拉伯糖基(1→4)[β-D-吡喃葡萄糖基(1→3)]-α-L-吡喃鼠李糖基(1→2)-β-D-吡喃葡萄糖苷，金合欢酸3-O-β-D-吡喃葡萄糖基(1→3)-β-D-吡喃夫糖基(1→6)[β-D-吡喃木糖基(1→2)]-β-D-吡喃葡萄糖苷；2个已知化合物结构分别是：金和欢酸内酯3-O-β-D-吡喃木糖基(1→2)-β-D-吡喃夫糖基(1→6)-β-D-2-去氧-2-乙酰氨基吡喃葡萄糖苷，金和欢酸内酯3-O-β-D-吡喃木糖基(1→2)-α-L-吡喃阿拉伯糖基(1→6)-β-D-2-去氧-2-乙酰氨基吡喃葡萄糖苷。

Results showed a high-purity and a good-integrity DNA can be obtained from the preserved fresh leaves of Camellia azalea, using the methods of modified CTAB and SDS subarea. The DNA extracting quality from the leaves preserved with silica gel by the methods of modified CTAB and SDS subarea is high, which is the same as from the leaves preserved at the -200C and liquid nitrogen, So these preserving methods are suitable for the fresh leaves of Camellia azalea, including for it from distant place.

结果表明，改进的CTAB和SDS区室法都适合杜鹃红山茶基因组DNA的提取，都能提取到完整性较好、纯度较高的基因组DNA，且在采用的-200C、液氮、硅胶脱水干燥3种方法保存样品中，硅胶脱水干燥法保存的样品与其它几种方法保存的样品一样，提取获得了高质量DNA，为远距离采样提取杜鹃红山茶DNA提供了一种较好的鲜叶保存方法。

The company main products: conductive adhesive, silica gel plates, silica gel films, silicone extrusions pads, silicone, rubber, foam board, foam tubes, foam, conductive products.

公司主要产品：导电胶，硅胶板，硅胶片，硅胶垫，硅胶管，橡胶制品，发泡板，发泡管，发泡条，导电产品等。

Our country produces late , among them silica gel product starting A, orbed B type silica gel Yu 1973 Enterprise develops out and industrialization produces some annual Shanghai chemical industry, have filled in the blank space packing in the homeland with silica gel.

我国生产硅胶产品起步较晚，其中A，B型球状硅胶于1973年上海某化工企业研制出并工业化生产，填补了国内包装用硅胶的空白。

By the interaction of ethyl acetate and water class solution, The nano silica was synthesized on fused silica capillary tubular inner surface, its morphology and change trend of surface area pore volume and pore size under different reaction condition were investigated.

第三章 原位溶胶-凝胶法制备纳米SiO〓型PLOT石英毛细管色谱柱及其应用建立了原位溶胶-凝胶法制备纳米SiO〓型PLOT色谱柱的方法，采用原位溶胶-凝胶法在毛细管内壁合成出均匀的纳米硅胶多孔层，对所合成的纳米硅胶颗粒进行了形貌表征，同时考察了不同反应条件下纳米硅胶的比表面积、孔体积和孔径的变化规律。

The purification-pretreatment technique of 8 kinds of solid phase extracting column stuffing (silica gel, acid silica gel, Florisil, siliceous magnesium sorbent, Al2O3, celite 545, acid celite, Al2O3+silica gel) for the prepared polluted soil containing 13 kinds of organochlorine pesticides (α-HCH,β-HCH,γ-HCH,δ-HCH, o,p'-DDT, o,p'-DDE, p,p'-DDT, p,p'-DDD, p,p'-DDE, a-endosulfan, dieldrin, endrin, hexachlorobenzene) was screened prior.

用製备的8种固相萃取柱填料（硅胶，酸化硅胶，氟罗里硅土，硅镁型载体，Al2O3，硅藻土载体545，酸性硅藻土，Al2O3+硅胶）对含有13种有机氯农药的污染土壤的纯化预处理技术进行了优化筛选。

One route was that the amino-groups on the silica gel were transformed to tertiary amines by Eschweiler-clarke reaction that amine-groups react with formaldehyde and methanoic acid to prepare tertiary amines; the silica gel intermediates with tertiary amine groups reacted with chorohydrocarbons to prepare insoluble silica gel quaternary ammonium salt bactericides. Another route was that the amino-groups on the silica gel reacted with excessive chlorohexadecane; the preparing intermediates were quaternized with iodomethane to obtain insoluble silica gel quaternary ammonium salt bactericides.

一条路线是根据埃施韦勒-克拉克(Eschweiler-clarke)胺甲基化反应，进行胺基叔胺化反应，制成带有叔胺官能团的硅胶中间体，此中间体上的叔胺与卤代烷反应生成杀菌活性官能团季铵盐，制成硅胶类水不溶性季铵盐杀菌剂；另一条路线是带有胺反应活性中心的硅胶与过量正氯代十六烷反应，得到的中间体再用碘甲烷季铵化，得到最终产品——水不溶性季铵盐杀菌剂。

AGA, AGL, PAGA and PAGL were soluble in water and DMSO but insoluble inother organic solvents. Poly- was soluble in DMSO but insoluble in water and other organic solvents.

以奎宁为原料，首次用含奎宁高分子化合物对硅胶表面进行了改性，利用元素分析和红外光谱对聚合物改性硅胶进行了表征，并探寻了聚合物改性硅胶的最佳制备条件。

The structure models of zirconium sulfate tetrahydrate and silica have been built. The binding morphology, charge distribution and energy change were also studied. It is deduced that the strong interactions between the active composition and support through hydrogen binding and dehydrate mode promise that zirconium sulfate tetrahydrate can disperse uniformly on the surface of support.

在对硅胶表面结构单元和四水硫酸锆单体空间模型结构参数进行优化的基础上，依据四水硫酸锆与硅胶载体表面的成键状态、电荷布居及能量变化，从理论上分析了四水硫酸锆与载体表面之间静电和脱水的相互作用的合理模型及硅胶负载型硫酸锆的结构稳定性，阐明了硫酸锆在载体表面的分散趋向于单分散的特征。

By contrasted with silica gel, the corn hull desiccants by hydrolyzation method and heat treatment method have advantages as stabilization on moisture adsorption, less water of reversible adsorption and high moisture adsorption ratio in high humidity. These desiccants have disadvantages as lower moisture ratio than silica gel in low humidity and slower moisture adsorption speed than silica gel. The corn hull desiccant by derivation method has advantages as high moisture adsorption ratio, high moisture adsorption speed, stabilization on moisture adsorption and hardly any water of reversible adsorption.

通过与变色硅胶干燥剂的对比，通过水解法和热处理法得到的玉米渣皮干燥剂的优点是吸水稳定，可逆吸附水少，在高湿度下吸水率高，不足是在较低的湿度下，吸水率比变色硅胶干燥剂略低，吸水速度比硅胶慢；通过衍生方法得到的玉米渣皮干燥剂的优点是吸水率高，吸水速度快，吸湿稳定持久，几乎不含可逆吸附水，不足是再生后产品容易结块。

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。