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Based on the addition of vinyl magnesium bromide to the chiral non-racemic synthon 2 derived from-1, an enantioselective total synthesis of-3, the antipode of marine alkaloid halitulin 10 steps, overall yield: 5.3% from (R-1 was achieved using aza-Claisen rearrangement as a key step.

取得的主要结果如下：一、从-苯基甘氨醇1出发，通过已知的哌啶手性合成砌块2的加成反应，建立了经aza-Claisen重排反应进行海洋生物碱halitulin手性分子片断的对映体--isohaliclorensin 3不对称合成的路线。

Based on the addition of vinyl magnesium bromide to the chiral non-racemic synthon 2 derived from-1, an enantioselective total synthesis of-3, the antipode of marine alkaloid halitulin 10 steps, overall yield: 5.3% from (R-1 was achieved using aza-Claisen...

取得的主要结果如下：一、从-苯基甘氨醇1出发，通过已知的哌啶手性合成砌块2的加成反应，建立了经aza-Claisen重排反应进行海洋生物碱halitulin手性分子片断的对映体--isohaliclorensin 3不对称合成的路线。

The dislocation density stress relations are derived with the help of the symmetric and antisymmetric parts of stresses.

通过求解应力对称和反对称部分可以得到位错密度-应力的相关关系。

Exploiting this property, we derived several necessary constraints on the number of symmetric/antisymmetric filters, which help to design multiwavelets with the desired symmetric property.

为此首先系统的调查了对应于两种类型对称性的m带紧支撑正交多小波的对称性质，即用滤波器和多相矩阵刻画了多小波系统的对称特征，并由此得到正交多小波系统中对称反对称元数目的约束条件，这对于后来对称多小波的设计是非常重要。

Taking the spring of coupled pendulum s as an uniform elastic rod, characteristic equations are derived for symmetric normal mode and antisymmetric modes.

将耦合摆弹簧作为弹性均匀杆，导出了对称简正模与反对称简正模的本征方程，给出各角频率值的近似式，并进行了讨论

ThyA. ctxB was also cloned in this plasmid to elicit anti-toxin immunal response. This improved vaccine candidate derived from IEM101 is named IEM108.which can elicit both antibacterial and antitoxic immunity.

并采用以管家基因thyA为选择压力的质粒-染色体致死平衡系统使之稳定表达，构建生物安全的抗菌抗毒基因工程活菌苗，该菌苗株命名为IEM108。

I explored the apanage ownership of biogenetic resources, and put forward the concepts of meta-property right, derived property right and rights of modification of biogenetic resources.

摘 要 本文探讨了生物遗传资源的属地所有权原则，并提出了生物遗传资源的元所有权与衍生所有权、生物遗传资源的修饰权。

These findings suggest that adipose tissue-derived mesenchymal stem cells seem to be a promising therapeutic option in patients with refractory pure red cell aplasia after ABO-incompatible hematopoietic stem cell transplantation, in whom conventional treatment fails.

提示应用脂肪源间充质干细胞治疗ABO血型不合造血干细胞移植后出现的顽固性单纯红细胞再生障碍性贫血有一定的疗效。

Analytical expressions for their degree distributions and clustering coefficients are derived, which depend on the dimension of the associated Apollonian packing.

对HDRAN、V-HDRAN及EAN这三个网络模型的拓扑性质进行了解析计算和数值模拟，解析与模拟结果相吻合。

The term is derived from the Latin adjective, apologeticus, which, in turn has its origin in the Greek adjective, apologetikos, the substantive being apologia,"apology","defence".

一词，是源自于拉丁语形容词， apologeticus ，这反过来有其原产地在希腊语形容词， apologetikos ，实质性被纵容，"道歉"，"国防部"。

Listen,point and check your answers.

听，指出并且检查你的答案。

Warming needle is one of effective treatment methods for knee arthralgia aggravated by cold,and it is simple,safety,so it should be developed in clinical acupuncture and moxibustion extensively.

但以本院科针灸门诊在2005年1月—2006年6月期间共收治膝痛患者100余例，经过临床的诊断后，其中施以温针治疗的48例，疗效显著，报道如下。1临床资料本组病例48