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They are obtained from avariety of botanical sources and betulinic acid can be easily prepared from the more plentifulprecursor betulin in a simple two-step process.

它们可以从丰富的植物资源中获得，白桦脂酸也可由更丰富的前体白桦脂醇经简单的两步制得。

A two-step method of causticization and precipitation technology was used to revive spent caustic of ethylene cracking, and various conditions which affect regeneration efficiency of the reaction were studied.

采用苛化及化学沉淀两步工艺对乙烯裂解废碱液的再生进行了研究，考察了影响再生效果的各种条件因素。

This paper introduces the way synchro equiped with differential transmitter take the place of traditional circumvolve coders and control the model gesture with two step electromotores.

1引言风洞是能人工产生和控制气流，用以模拟飞行器或物体周围气体的流动，并可量度气流对物体的作用以及观察物体现象的一种管道试验设备。

Using SPDP as a heterobifunctional crosslinker, R-PE isolated from Corallina officinalis and sheep anti-rabbit IgG purified by ion exchange chromatography as conjugated reagent, we prepared the phycoerythrin fluorprobes by two-step binding protocol.

以双功能试剂SPDP为交联剂，从珊瑚藻中纯化的R-PE和购买的离子交福建农林人学博1：学位论文2二换纯化的羊抗兔抗体为标记材料，利用两步标记法获得藻红蛋白抡疫荧光探针。

The biotechnology production efficiency of crocin II, which has anti-cancer activity, was improved in a solid-liquid two-step cell culture in which the callus cells obtained from the solid medium were transferred to the liquid medium.

为提高现代生物技术生产藏红花素的产率和效率，该研究采取固液两步培养法将在固体培养基中获得的藏红花愈伤组织转移到液体培养基中进行生物合成，结果显示生物反应器比摇瓶培养更有利于生物量的积累，也更有利于2号藏红花素的合成。

We prepared the ordered porous alumina membrane by a two-step anodization method in oxalic or sulfuric acids, which is a self-ordered hexagonal array of cells with an adjustable pore diameter of 20-150nm and a different pore structures (i.e. Y-branched, dendriform, toothed and torous ones). Furthermore, the template-electrodeposition, vapor-catalytic growth, and controlled chemical etching were developed for well-aligned carbon nanotubes and oxide nanopillars with adjustable diameter, Al2O3-AlN one-dimensional heterojunction, Y-junction and dendriform metal nanowires, as well as Y-junction, and torous carbon nanotubes. The resultant one-dimensional junctions were characterized by XRD, SEM, TEM,HRTEM, and STM, and the field emission of the well-aligned carbon nanotubes and the luminescence of ZnO nanopillar array have also been mearsured.

完善和发展了阳极腐蚀法制备多孔氧化铝膜的方法，制备出了孔径在20-150nm之间可调和具有不同孔结构（如Y形、树枝状、锯齿状）的系列多孔氧化铝模板，在此基础上，利用电化学沉积、气相催化生长和化学控制腐蚀等方法，成功地生长出具有可调直径的碳纳米管和氧化物纳米柱有序阵列、Al2O3-AlN异质结纳米线、Y形和树枝状的金属纳米线以及Y形、藕节形和锯齿形的碳纳米管等多种一维结纳米材料及其阵列体系，探索了基于模板孔壁内沿生长一维结纳米材料的机制，较系统的研究了碳纳米管阵列的场发射性能和氧化锌纳米柱的发光性能，为低维纳米材料器件化提供了实验基础。

Using 2-bromo-ethanesulfonic acid sodium salt ,α,ω- binary primary amine and dodecanoic acid as the main raw materials, drawing support from two-step synthesis of experiments—Alkylated reaction and Schotten-Baumann acylation, A series of LAS(12-s-12) gemini surfactants were synthesized.

并以2-溴乙基磺酸钠、α，ω-二元伯胺、月桂酸等为主要原料，借助胺基的烷基化和Schotten-Baumann酰基化反应制备了α，ω-烷撑-双钠盐LAS(12-s-12)表面活性剂，联结基团为亚甲基—(CH2)s—(S=2，4，6，8，12)，取得以下进展

Results It was found that after the injection of No.1 antis ense both two strains of mice showed damaged memory and there were obvious diffe r ences between experimental groups and control groups.

结果 注射No.1基因的反义核酸后，两品系的实验组均在测试记忆力的步下法(Step-downTest)试验中表现出记忆力减弱，且与对照组差异明显，说明No.1基因的功能确与记忆相关。

Cu2O/Cu nanocomposites with flowerlike nano-architecture were prepared using a template-free two-step hydrothermal synthesis route.

不采用任何模板，利用原位逐步水热方法一次性合成了花状Cu2O/Cu复合材料。

The batch seeded isothermal desupersaturation experiments of SPM in aqueous solution were carried out and the overall crystal growth kinetics parameters were determined by the nonlinear optimization techniques. Assuming that the volume diffusion rate at growth is equal to the mass transfer rate at dissolution under the same conditions, the two-step crystal growth rate parameters can be determined. At the fow supersaturation, the surface integration rate is proportional to relative surface supersaturation.

通过测量螺旋霉素均相成核动力学，获得了表面能的值，估算出表面熵因子的值在1.41～1.56之间，从而可以推断出螺旋霉素晶体生长的表面反应速率同表面相对过饱和度成线性关系，这种生长机理同第四章得到的结果是相吻合的；利用估算的表面熵因子的值，把螺旋霉素晶体看作为简单的立方科瑟尔晶体，根据能量最低原理，对螺旋霉素的晶体生长进行了模拟。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。