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It is reported that alkannin and shikonin isolated from the roots of Lithospermum erthyrorhizon or Alkanna tinctoria and their acylshikonin derivatives are potent selective inhibitors of DNA Topoisomerase Ⅰ.

文献报导紫草素和酰基紫草素等具有DNA拓异构酶Ⅰ的选择性抑制活性。本组曾合成得到少量环异紫草素(8),它对小鼠白血病P-388肿瘤细胞具有强烈的抑制作用。

In this paper, we mainly study the alternating group A_4 actions on spin 4-manifolds. First we discuss the special action of A_4 on K3 surfaces of Fermat type, we compute the fixed points set of this action and some invariants of the group action, also we get some topological properties. Then we study the A_4 actions on general K3 surfaces and obtain some similar results.

本文主要是以交错群A_4在K3曲面上的作用为研究对象,从Fermat型K3曲面上的特殊的A_4作用出发,得到了Fermat型K3曲面上A_4作用的不动点,利用不动点集计算了群作用的一些不变量并得到了相关的拓性质,在此基础上进一步把其中的一些结果推广到一般情形下的同伦K3曲面上。

The girl is a woman that graceful graceful jade establishs, orange amice of Juan Xiu is sent, the melon seed face that Bai Xi shines completely, attack below the brow of willow Xie Shi showing eyelash to grow nucleus of long a pair of apricot big.

姑娘是位婷婷玉立的女子,隽秀的橙色披肩发,白晰净亮的瓜籽脸,柳叶似的眉毛下闪着睫毛长长的一双杏核大眼。

For example: antimalarials primaquine morpholine, flutter malaria quinoline, quinine, chloroquine, quinacrine; antibacterial drugs have sulfa drugs, chloramphenicol and furans; antipyretic analgesics are acetyl salicylic acid, phenacetin, acetanilide, antipyrine, aminopyrine; other drugs such as vitamin K, probenecid, hydralazine, quinidine, methylene blue, toluene and so on.

抗疟药伯氨喹啉、疟喹啉、奎宁、氯奎、阿的平;抗菌药有磺胺类药物、氯霉素及呋喃类;解热镇痛药有乙酰水杨酸、非那西丁、乙酰苯胺、安替比林、氨基比林;其它药物如维生素K、丙磺舒、肼苯哒嗪、奎尼丁、美蓝、甲苯等。

Has analyzed the original network analysis situs existence question, as well as the new network is opposite in the old network improvement.

分析了原有网络拓存在的问题,以及新网络相对于旧网络的改进。

At first the paper has introduced the power amplifier, including its classification, its main technical specification, several kinds of common enlargement circuitry, and analyzed the switch power amplifier principle of work as well as its analysis situs expansion.

本篇论文首先对功率放大器进行了介绍,其中包括它的分类,它的主要技术指标,几种常见的放大电路原理,分析了开关功率放大器的工作原理以及其拓扩展。

On the basis of analysis of existing problems in application of common comprehensive optimization models, the characteristics of optimization are combined with the principle of Artificial Neural Network organically. The ANN analysis situs structure is established and the learning algorism for the ANN is designed. The methods of generating training samples and alternative optimization are put forward.

在分析水利水电工程常用综合优选模型应用中存在问题的基础上,将综合优选问题的特点和人工神经网络原理有机结合,建立了方案综合优选的人工神经网络拓结构;设计了相应的网络学习算法;提出了生成训练样本和方案优选方法。

We may conceive an analysis situs graph, in a spatial on observation is such, observes in addition on spatial or such, what is different, in two spaces is the masculine and feminine elements, saw in the positive spot cloudy, saw in the cloudy spot positive.

我们可以设想一个拓图形,在一个空间点上观察是这样的,在另个空间点上观察还是这样的,不同的是,在两个空间是阴阳的,在阳的点看到阴,在阴的点看到阳。

Achieved has been able to construct each kind of structure nimbly the network analysis situs, manifested each kind of networking, realized networking training and the network theorem teaching goal, simultaneously gave the engine room to reserve the promotion condition, reduces cost which the network and the hardware development brought.

达到了能灵活地构建各种结构的网络拓,体现各种网络技术,以实现网络技术培训及网络原理教学的目的,同时给机房预留了升级的条件,减少网络与硬件发展带来的成本。

In the daily management of distribution network, the network structure and the equipment and they locate the geographical environment close correlation, like equipment such as transformer substation, pole tower, user, transformer, with geographical coordinate closely relates in together, but power distribution equipment management, movement management, production scheduling, plan design and so on not only must understand electrical network analysis situs relations and equipment situation, but also must grasp space position which his they is at, therefore must and its geographical coordinate the characteristic position relates the equipment the unification management.

在配电系统的日常管理中,网络的结构与设备和它们所处的地理环境密切相关,如变电站、杆塔、用户、变压器等设备,和地理坐标紧密联系在一起,而配电的设备管理、运行管理、生产调度、规划设计等不但要了解电网的拓关系和设备情况,还要掌握它们所在的空间位置,因此必须将设备及其地理坐标特征位置联系起来统一管理。

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推荐网络例句

Lugalbanda was a god and shepherd king of Uruk where he was worshipped for over a thousand years.

Lugalbanda 是神和被崇拜了一千年多 Uruk古埃及喜克索王朝国王。

I am coming just now,' and went on perfuming himself with Hunut, then he came and sat.

我来只是现在,'歼灭战perfuming自己与胡努特,那麼,他来到和SAT 。

The shamrock is the symbol of Ireland and of St.

三叶草是爱尔兰和圣特里克节的标志同时它的寓意是带来幸运。3片心形叶子围绕着一根断茎,深绿色。