合成地

Treatment of sucrose alkyl 4,6-orthoacetate hexaacetates I with water or alcohol in the presence of an acid catalyst afforded derivatives of sucrose acetates by selectively blocking specific hydroxyl group in sucrose and acetyl migration.

4，6-原乙酸蔗糖六乙酸酯在酸催化下水解和醇解，选择性地保护了蔗糖分子中的某些羟基，并通过乙酰基由C~4→C~6迁移的异构化反应合成了一系列蔗糖乙酸酯。

Therefore, how to develop a new simple and efficient method to synthesize alkaloids is the main thesis of my doctoral work.

因此，我们希望发展一种简单高效的方法来有效地实现生物碱的合成，这就是本论文的主要目的。

Allosteric control enables the cell to regulate needed substances rapidly.

变构调控使细胞能迅速地调节所需物质的合成。

Through changing the concentrations of CTAB and sodium ascorbate,Pd nanoparticles with different shapes were obtained.

溶液中CTAB和还原剂浓度的改变，非常明显地影响合成产物中不同形貌钯纳米颗粒的产率。

The dark bands alternating with light bands,relatively stable and R-band-like structure was showed on the pachytene bivalents of Rics-field eelby using the random-primed in situ digoxigenin-labelled DNA synthesis technique,and the results were analysed and discussed in detail.

在黄鳝二价染色体上，运用地高辛配基标记的随机引物原位DNA合成技术诱导出了明暗相间、基本稳定且类似于R带的带状结构。本文对该结果进行了较详细的分析和讨论。

The key steps were the stereospecific conversion of both allylie carbamates 10 and 13 into 11 by Li_2Cu_3(CH_2)_5 and the stereoselective hydroxylation of unsaturated side chain by OsO_4-NMO.

合成的关键步骤是用Li_2Cu_3(CH_3)_5立体专一地转化烯丙醇苯胺基甲酸酯10和13成为11和用OsO_4-NMO在化合物16的不饱和侧链上立体选择性羟基化。

In HepG2-Teton cell lines,the induced expression of RX8 inhibited cell growth and the formation of cell colones,and deduced S phase cell number and the de novo protein synthesis.

在HepG2-Teton细胞株中，诱导表达的RX8能明显地抑制细胞的生长和细胞克隆的形成，并使细胞周期中处于合成期的细胞数减少和新生蛋白的翻译量降低。

Meanwhile, the insecticide barrage had been augmented by dieldrin, parathion, heptachlor, malathion and other fearful compounds many times stronger than DDT, all of which the government planned to distribute through the Department of Agriculture for public use and commercial manufacture.

此时，地特灵、拉松、布达、拉松以及其他比DDT更可怕数倍的合成农药使用量已经大量增加，全都源自政府规划，透过农业部散播给大众使用以及商业制造。

For meeting the needs of automated real-time dynamic monitoring of heavy fog events by means of a weather satellite remote-sensing technique for specialized meteorological services like military operations and highway traffic, the paper presents a systematic study of spectral characteristics of visible and infra red light, the textures and dynamic dispersals of fogs on satellite imagery in the context of theory on the transmission of atmospheric radiation, thereby revealing their abruptness, waviness and mass-like features, which, in combination with a synthetic technique for cloud/fog maps of multi-channel remote-sensing spectra are used to set up a model for automatic separation of fogs from clouds based on the integrative application of spectral features and texture structures, for which are constructed corresponding discfiminant functions and criteria, and on this basis prepared is a"system for remotely-sensing monitoring of low cloud and heavy fog"which has been used for tests, with the main conclusions shown as follows.

本文针对军事和高速公路等专业气象服务中应用气象卫星遥感技术对大雾进行自动化实时动态监测的实际需要，从大气辐射传输理论入手，系统地研究了气象卫星遥感图像上云雾的可见光和红外光谱特征、纹理结构特征和大雾的消散动态特征，揭示了雾的突发性、波动性和团状雾特性，通过研究多通道遥感光谱的云雾图像合成技术，建立了综合应用光谱特征和纹理结构特征的云雾自动分离模型，给出了相应的判别函数和判别准则，研制了&低云大雾遥感监测系统&，并进行了实际应用试验。

This is the first report that gene galU and ptsP may be employed in the regulation of the biosynthesis of elastase.

推测ptsP和galU基因很可能直接或间接地调控着弹性蛋白酶的生物合成。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失