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The recycle times and reproductive capability of catalyst, reaction temperature, reaction time, amount of catalyst, molar ratio of mixture have been investigated.

强酸性阳离子交换树脂催化制备醋酸正丙酯适宜的条件为：反应时间为2h，催化剂用量为15%，沸腾状态反应，酸醇摩尔比为1：1。

The method can be used in the determine of cationic surfactants of the survey of living water, sewage farm import-exit water.

方法能用于生活用水、污水处理厂进出口水中阳离子表面活性剂的测定。

The company is located in Foshan City, Guangdong Province in South China Sea, is a production of polyester fibers differentiate mainly of chemical fiber enterprises, the annual output 20,000 tons, the main products: pre-orientation of polyester filament; drawn yarn; low - Wire, differentiated varieties are: non-ferrous metals high Ditan Si; wire network; Fangma wire; high shrinkage wire; special-shaped cross section wire; bamboo silk; cationic dyeable silk; sewing thread with high-strength wire.

本公司位于广东省佛山市南海区，是一家以生产涤纶差别化纤维为主的化纤企业，年产量2万吨，主要产品有：涤纶预取向丝；牵伸丝；低弹丝，差别化品种有：有色高低弹丝；网络丝；仿麻丝；高收缩丝；异型截面丝；竹节丝；阳离子可染丝；高强度缝纫线用丝。

The hydrophobic effect in thd process of transfer of cationic surfactants from aqueous solution to the solid surface has been studied.

讨论了疏水效应在阳离子表面活性剂从水溶液中吸附到活性炭表面这一过程中所起的作用。

The ether oxygen groups and the carbonyl groups of polyurethane could"solvate"alkali metal cation and play the role of driving force of metal cation transport in the systems.

聚醚型超支化聚氨酯中醚氧和羰基集团，相对线性聚氨酯能更有效地通过"络合"和"解络合"方式，起到"溶解"和推动碱金属阳离子传输的作用。

Moreover, the different cations result in difference of NOR sorption.

同时，不同阳离子导致诺氟沙星的土壤吸附存在差异。

Results (1) The objective compound was synthesized, and its structure was confirmed by mass spectrography, infrared spectrography and nuclear magnetic resonancespectroscopy.

4用重组真核表达载体pLXSN-hBD2通过新型阳离子脂质体对大鼠气道上皮细胞进行转染，用PCR、Western blot检测hBD-2基因的整合与表达。

Objective To synthesize new cationic liposome cytofectin N 4 spermine cholesteryl carbamate as a gene delivery vehicle for gene therapy of lung diseases.

目的 合成新型阳离子脂质体细胞转染素N4 精氨胆固醇羰酰氨，作为基因载体，用于肺部疾病的基因治疗。

The isolation and purification of β-NGF form mice submaxillary gland werecarried out by using CM-FF ion exchanger.

本文采用国产阳离子交换树脂CM－FF，两步柱层析从小鼠颌下腺中分离、纯化神经生长因子，并与Whatman公司的CM-C（CM32）离子交换树脂进行了比较。

The mechanism ofcopolymerization and the best technological condition for copolymerization and sulfonation were studied .

重点研究了树脂基体合成及基体磺化制备阳离子交换树脂，找出了基体合成及磺化的最佳工艺条件。

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。