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The chloroform layer and the aqueous layer were separated by multiple column chromatography including macroporous resin, silica gel and polyamide column and preparative HPLC. The compounds obtained were identified by mass spectra and NMR data.

大青叶乙醇提取物,用氯仿萃取后得到氯仿层和水层,各层再分别采用硅胶柱、大孔树脂柱、聚酰胺柱、制备液相、葡聚糖凝胶柱层析及重结晶等分离手段进行分离、纯化,并应用化学性质和质谱、波谱法(1H-NMR、13C-NMR、HMBC)鉴定其化学结构。

The endogenous cellulase from the gut of Pheretima aspergillum by homogenization was separated by DEAE anion exchanger and gel filtration chromatography, and a single band with cellulase activity was identified by SDS-PAGE and zymography.

通过对参环毛蚓肠道组织提取液进行DEAE阴离子交换及凝胶过滤层析,获得参环毛蚓单一的内摞纤维素酶的活性组分。

The petroleum of BoHai bay is a kind of high gluey, asphaltum and viscosity crude oil. Its emulsion is very difficult to be broke, only less than high pour point and heavy crude oil. And it is always a serious problem to choose several good kinds of demulsifiers in the oil gathering process of BoHai bay.

渤海地区海上原油的特点是属于高胶质沥青质环烷基稠油,其所形成的原油乳状液是比较难处理的原油乳状液,它的脱水难度仅次于高凝稠油,其针对性破乳剂的选择一直是困扰生产的主要问题。

The aspic may need additional gelatin in order to set properly.

什肉冻通常以冷菜出现,服务时盘子一定要现在冰箱中冷藏一下,保证凝胶不会融化。

For the request of the high resolution ability of X-ray imaging, the inorganic scintillating materials with high effective atomic numbers and high density are studied intensely.

针对X射线高分辨成像的要求,具有较高有效原子序数和较大密度的无机闪烁材料成为当今研究的热点,重点阐述了溶胶-凝胶法制备这类闪烁薄膜的研究现状,并对其今后的发展进行了展望。

The preformed aluminophosphate precursor was obtained after the gel was heated at 423 K for 4 h in an autoclave.

该 预制铝前身是获得后凝胶加热423 K时为4小时,在一个反应釜。

Sol-gel Autoignition Synthesis, simple, self-cleaning and easy to undertake scale production, is the one of the prospective routes for manufacturing barium titanate powders.BaTiO3 nanopowders with the particle size 20-90nm, specific surface area 15m2/g, fine particle distribution, ratio of Ba/Ti 1.002 and with the dielectric constant more than 3000, were synthesized by SAS BaTiO3-TiCl4-ammonia-citric acid system.

本文自己组装的溶胶凝胶自燃合成系统,利用对Ba(NO_3)_2-TiCl_4-柠檬酸-氨水体系进行自燃合成研究,制备了具有纳米尺度的近球形BaTiO_3颗粒,粒径介于20-90nm之间,比表面积15m~2/g,分布范围较窄,Ba/Ti为1.002,器件介电常数最高达3000多。

The DNA replication is usually assayed by denatured gel electrophoresis and autoradiography, which are complex, time-consuming, and incapable of acquiring the dynamic data in real time.

目前DNA复制的研究,一般采用放射性标记与凝胶电泳相结合的方法,操作复杂,不利于方便快捷地捕获生命活动过程中的重要信息。

In vitro cleavage reaction was performed at 37℃ for 1h under the presence of Mg++. The cleavage product was analyzed by polyacrilamide gel electrophoresis. After autoradiography, the cleavage rate was counted by image analysis.

体外切割作用在Mg++的存在下,37℃反应1小时,进行聚丙烯酰胺凝胶电泳,放射自显影后经图像分析计算出切割率。

On the basis of summarizing the rationales for various kinds of delivery systems and comparing their merits and demerits, four novel types of hydrophobically modified hydrogels cross-linked with azobenzene were designed and synthesized.

本文在总结各类传递系统的设计原理、比较其优缺点的基础上,设计并合成了四类疏水改性的偶氮苯交联凝胶。

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