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This is a good cause, if a novel needs one; it's gratifying to encounter a Sappho whose sex drive is based in pleasure instead of neurosis, and who is interested in politics as well as pillow talk.

如果一本小说需要一个理由,那么这是个好的理由;遇上这样的一个萨福是让人满足的,她的性冲动是来自于对欢愉的追求而不是因为得了神经官能症,她对政治和对枕边谈心一样的感兴趣。

The synthesis of the pentacyclic skeleton of Et-743 and the construction of the five chiral centers thereof.1. The core pentacyclic skeleton of phthalascidin was constructed with L-dopa as the starting material via thirteen steps. First, two basic synthons, the C-1 functionalized tetrahydroisoquinoline compounds 8 and N-protected Z-dopa derivative 9, were prepared from L-dopa. They were coupled via amide bond to form the dipeptide compounds 10, which were the first key intermediates. Then the primary hydroxyl groups were transformed into the corresponding amino aldehydes 11 via Swern oxidation. Followed by the intramolecular Pictet-Spengler cyclization, the pentacyclic compounds 12 were synthesized.

五环骨架的构建及五个正确手性中心的确立:1.1我们以L-多巴为起始原料,经过多步官能团保护和转化合成了基本结构单元8然后和苯丙氨酸衍生物9,通过缩合反应生成酰胺中间体10,经Swern氧化得到醛化合物11,然后再次利用分子内改良的Pictet-Spengler反应一步构建c,d两环,得到五环骨架化合物12,最后,实现了21-位羰基向氰基的转化,得到了C-1位官能化的化合物14,化合物14不但具有和Et-743一致的五环骨架,而且分子中五个手性中心立体构型也与其完全相同:其中,3,位和13,位的手性中心由原料L-多巴带入,而1,位,11,位和21,位手性中心则通过不对称诱导而确立。

Second, aminolysis of polystyrene and poly prepared by reversible addition-fragmentation chain transfer polymerization was investigated. The product of the former contains predominantly double molecular weight species by the formation of disulfide bond, whereas the latter formed coupled species which consequently cleaved to unimolecular weight species.

由RAFT聚合的机理可知,聚合最终得到的聚合物的结构包含双硫酯基团,它是聚合物链保持活性特征的重要体现,同时它为聚合物的端基官能化提供了一个重要的途径,其中氨解反应是一个被人们广泛采用的方法,它在很温和的条件下将端基去掉,同时还能将双硫酯端基变成硫醇端基。

The spiritual faculties of the unregenerate man lie asleep in his nature, unused and for every purpose dead; that is the stroke which has fallen upon us by sin.

一個未重生的人,他的屬靈官能是沉睡的,他從來沒有使用過它,它的一切作用也是死的,那是由于罪所加于我們的打擊。

In addition,α-alkenoyl ketene--acetals mainly used as the synthons of 3C and 5C, theα-functionalized reactions of which just limited on some simple reactions, as bromination, nitration, acetylation. However, the understanding of the forming of C-C bond atα-position is far from enough.

另外,对于α-烯酰基二硫缩烯酮的研究则主要集中在其作为3C或5C合成子的研究上,其α-位的官能化研究只是停留在溴化、硝化、脱羧等简单的反应之上,而对α-位C-C键的形成还缺乏足够的认识。

CNTs were first pre-treated using acid solution (HNO3) to obtain CNTs functionalized with carboxylic groups. Subsequently, the stearyl alcohol was grafted onto CNT with the assistance of dehydrating agent, N,N'-dicyclohexyl-carbodiimide. Excellent dispersion in organic solvents such as acetone, THF, and chloroform was found for the modified CNTs (CNT-C18). In addition, the PBS/CNTs nanocomposites were then prepared through simple melt-blending. Mechanical properties, thermal behavior, conductivity of resultant polymer/CNT composites were investigated. The results show that excellent dispersion of nanotubes in the PBS matrices was achieved.

为了增加多壁奈米碳管在复合材料中的分散性,将碳管表面进行化学修饰,首先将多壁奈米碳管浸入HNO3溶液中,进行酸化,使碳管表面带有羧酸的官能基,然后再加入十八烷醇,在温和的条件下,藉由N,N'-二环己基碳二亚胺(N,N'-dicyclohexyl- carbodiimide,DCC)脱水剂脱水,使碳管和十八烷醇之间产生酯基的化学键结,改质后的碳管可以分散在acetone、THF、chloroform…等有机溶剂中,结果显示成功的利用DCC脱水剂完成碳管的改质。

Pristine Li-Al LDHs are synthesized by hydrothermal process in different reaction conditions by varying the aging time for 1 and 24 hours. Both the Li-Al layered double hydroxides (abbreviated as Li-Al LDH1 and Li-Al LDH24 for aging time 1 hour and 24 hours, respectively) were modified by using sulphanilic acid sodium salt hydrate, modified agent to form modified Li-Al LDH1-SAS and Li-Al LDH24-SAS. The morphology of the pristine layered double hydroxides are investigated by using wide angle X-rays diffraction, scanning electron microscopy and particle size analyzer which indicates that the crystallinity and aspect ratio is increased with increasing the aging time from 1 hour to 24 hours. The particle size of Li-Al LDH24 and Li-Al LDH1 are found to be ~1000 nm and ~250 nm, respectively. Both the pristine and modified LDHs are characterized by XRD, FTIR spectra and thermogravimetric analysis.

本研究目的在於改变长晶时间的长短,合成出同径大小的Li-Al LDHs,再经由改质剂sulphanilic acid sodium salt hydrate将Li-Al LDHs无机层材表面有机官能化制备出改质型Li-Al LDHs-SAS,於是进一步藉由扫描式电子显微镜、射径仪和穿透式电子显微镜等仪器分别观察LDHs改质前和改质后其主层结构型态上的变化;从中可以发现Li-Al LDHs随著长晶时间的增加其径有随之增大的趋势,但经有机化改质后其径会由於改质环境的影响明显低许多,针对此现象本实验将未改质和改质后之Li-Al人工无机层材制备成复材进一步探讨其在热性质和难燃特性上的为表现。

If he deteriorates his bodily or mental faculties, he not only brings evil upon all who depended on him for any portion of their happiness, but disqualifies himself for rendering the services which he owes to his fellow-creatures generally; perhaps becomes a burthen on their affection or benevolence; and if such conduct were very frequent, hardly any offence that is committed would detract more from the general sum of good.

他如果毁伤了自己的肉体的或精神的官能,他就不仅给所有赖他以取得某一部分快乐的人带来了灾祸,而且也使自己丧失了为同胞服一般所应服的劳役的资格,或许还在他们的好感或善心上成为一个负担;这种行为若频频发生,实比任何罪行都会更多地减损善之总量。

Sol–gel/diaminobenzoic acid hybrid materials were also generated to be used as the MALDI matrices for the analysis of oligonucleotides. It is because that DABAs have good molar absorptivity at wavelength of 337 nm. Furthermore, two amino functional groups attached to the aromatic ring in DABAs can also suppress the cation adductions of oligonucleotides and leave the protons to the oligonucleotides during MALDI-MS analysis. This matrix system can be used as an alternative for the analysis of oligonucleotides.

本论文也利用双胺基苯甲酸与溶胶凝胶混成产物当做MALDI基质来分析DNA分子,利用双胺基苯甲酸本身具有吸收雷射的特性,且其含胺之官能基可和钠、钾离子竞争DNA上磷酸根的负离子结合部位,因此可和DNA有较强的亲合力,而在脱附游离的过程中并可转移质子给磷酸根,可有效降低盐类的干扰,此一基质系统可取代传统MALDI基质混合胺盐的效果,适合用於DNA样品的分析。

The recent progress in molecular design and synthesis of polyborosilazane precurosors for SiBCN ceramics is reviewed.Especially the borazine modified polyborosilazane,monofunctional borane modified polyborosilazane on side chai...

本文分4个方面,即基于硼吖嗪的聚硼硅氮烷、侧基含有环硼氮烷或单硼烷的聚硼硅氮烷、基于多官能硼烷构筑的聚硅氮烷和含硼聚硅基碳化二亚胺,从聚硼硅氮烷分子结构设计、改性、合成及在多维尺寸材料中初步应用的角度综述了该领域国内外研究的新进展,指出了聚硼硅氮烷陶瓷前驱体设计合成研究发展中值得关注的新方向。

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Plunder melds and run with this jewel!

掠夺melds和运行与此宝石!

My dream is to be a crazy growing tree and extend at the edge between the city and the forest.

此刻,也许正是在通往天国的路上,我体验着这白色的晕旋。

When you click Save, you save the file to the host′s hard disk or server, not to your own machine.

单击"保存"会将文件保存到主持人的硬盘或服务器上,而不是您自己的计算机上。