查询词典 silica gel

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。

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。

The company main products: conductive adhesive, silica gel plates, silica gel films, silicone 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。

Activated MT desiccants has the performance of deliquescent, deoxidized, fresh protection, anticorrosive, has long-term efficient. So it is a kind of healthy, green and environmental products. The usefulness is as same as silica gel desiccant, and it is the upgraded products for silica gel desiccant.

MT纯天然活性干燥剂具除湿、除氧、保鲜、防蚀、长效功能，是一种绿色环保产品，用途基本同硅胶干燥剂，是硅胶干燥剂的升级换代产品。

Provide various specifications of the thermal conductivity of silica fabrics / films, films with silica gel hot heat Laminated Materials, CD-ROM Anti-slip silicone pad dedicated, transparent silicone tube, flame-retardant silicone casing, thermal conductivity soft gel tablets, high temperature resistant silicone sealed tube / article, TFT-LCD with buffer shading silicone membrane, eggbeater with silicone tube (core material: stainless steel), PCB hot silicone cushion gaskets, such as a few more than ten kinds of series, million kinds of silicone products specifications.

提供各种规格之导热硅胶布/片、发热片用硅胶热贴合材料、CD-ROM专用硅胶止滑垫、透明硅胶套管、阻燃硅胶套管、导热软质硅胶片、耐高温硅胶密封管/条、TFT-LCD用缓冲硅胶遮光膜、打蛋器用硅胶管、PCB热压硅胶缓冲垫片、等数十余种系列，万余种规格之硅胶产品。

And the operational condition was as follows: 100-200 mesh silica gel to be the stationary phase, solvent system of methlene chloride: ethyl acetate: ethanol = 80:35:5 to be the eluent, the flow rate of the eluent to be 2.0 mL/min, the feeding concentration of pristinamycins to be 2.26 g/L, the total loading amount of the silica gel to be 0.81 mg/g and the temperature to be 25℃.

优化后的柱层析操作条件为：选用100～200目的硅胶，二氯甲烷：乙酸乙酯：乙醇=80：35：5为洗脱剂，流速为2.0 mL／min，普那霉素的进样浓度为2.26g／L，硅胶的总负载量约为0.81 mg／g，温度为25℃。

The results are shown as follows:The equilibrium for adsorption of neptunium on silica gel reached rapidly. In high acidities,neptunium is hardly adsorbed on silica gel.

用239Np溶液进行上述实验后，又用239Np与237Np的混合溶液或237Np溶液进行了上述部分实验以比较微克量的237Np和示踪量的239Np在硅胶上的吸附行为。

The adsorption isotherm of neptunium on silica gel correspond to the form of Langmuir isotherm. According to Clausius-Claperon equation,from the slope in InKd vs 1/T plot,adsorption heat could be estimated. From the data of adsorption heat it is concluded that the adsorption of neptunium on silica gel in nitric acid solutions belongs to chemical adsorption and the adsorption process is an endothermic reaction.

三种价态的镎在硅胶上吸附的等温线符合兰格缪尔吸附等温线的形式，是单分子层吸附；根据克劳修斯-克拉柏龙方程，以1nKd对1／T作图，通过直线斜率计算出吸附热，从吸附热的数据可判断三种价态的镎在硅胶上的吸附属于化学吸附，是吸热的过程；对NpOV）、Np和Np（VD在硅胶上的吸附进行了比较，提出了三种价态的锋在硅胶上吸附的机理。

Then the utilization solvent parting method, low pressure silica gel separation method and so on column chromatograph, opposition silica gel, glucosan gelatin chromatograph, pocket resin, carries on the chemical composition to the effective spot the system separation; The chemical composition obtains which to the separation carries on the structure appraisal with four big spectra.

然后运用溶剂分离法、低压硅胶柱色谱、反相硅胶、葡聚糖凝胶色谱、大孔树脂等分离手段，对有效部位进行化学成分的系统分离；对分离得到的化学成分用四大光谱进行结构鉴定。

Methods Column chromatography over normal phase silica gel, reversed phase silica gel, Sephadex LH-20, and recrystallization techniques were used to isolate and purify constituents from Halenia elliptica.

利用正相硅胶柱色谱、Sephadex LH-20柱色谱、反相高效液相色谱和重结晶等手段进行分离

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。