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In the presence of DMSO as co-solvent and under vigorous agitation, baker\'s yeast in water was found to reduce substituted fluorenones to the corresponding fluorenols in good to excellent enantioselectivies (52%~ 100% ee). The experimental results clearly revealed that when mass transfer limitations are overcome, baker\'s yeast is able to reduce even highly sterically hindered ketones, such as substituted fluorenones.

在强烈的搅拌、并使用DMSO作为底物助溶剂的反应条件下，面包酵母对取代芴酮显示出较高得还原活性，得到立体选择性很高的相应的芴醇(52%～100%ee)。

By the nucleophilic substitution reaction of 6-O-tosyl-l,2:3,4-di-O- isopropylidene-a-Z-galactopyranose (3) with some substituted 1, 2,4- triazole-3-thiols (4a ~ 4c) or 1, 2, 3,4-tetrazole-5-thiols (5a~5f), nine 6-S-(substituted triazolyl or tetrazolyl)-l,2 : 3,4-di-O- isopropylidene-a-D-galactopyranoses (6a ~ 6i) were prepared in high yields. Their structures and configurations were analyzed and established by elemental analysis, IR, NMR, MS spectra.

报道了6－O－对甲苯磺酰基－1，2：3，4－二－O－异亚丙基－α-D吡喃型半乳糖（3）与取代的3－巯基三唑或5－巯基四唑4a-4c或5a-5f的亲核取代反应，合成了9个6－S－－1，2：3，4－二－O－异亚丙基－α- D吡喃型半乳糖（6a-6i），通过元素分析，IR，NMR和MS确证了上述化合物的结构，并经分子模型计算进行了其构象分析。

The study compares the Seebeck coefficient in the amino-substituted and unsubstituted butanethiol junction and observes interesting thermoelectric properties in the amino-substituted junction.

在利用butanethiol为实验对象下，我们发现有用氨基取代的butanethiol和没有取代的butanethiol，它们的Seebeck 系数会呈现非常大的不同。

An optically clear thermoplastic resin composition consisting essentially of: structural units derived at least one substituted or unsubstituted polycarbonate, at least greater than 30 weight percent of a substituted or unsubstituted polyester, a modified polycarbonate, an impact modifier having a refractive index in the range between about 1.51 and about 1.56 and an additive is disclosed.

公开了一种光学透明热塑性树脂组合物，该组合物基本上由以下组成：结构单元衍生的至少一种取代的或未取代的聚碳酸酯，至少大于30wt％的取代的或未取代的聚酯，改性的聚碳酸酯，折射率范围为约1.51～约1.56的抗冲改性剂和添加剂。

A general novel synthetic method to Symmetrically or unsymmetrically 2,3,6,7- substituted thieno[2,3-d:5,4-d\']dipyrimidine-4,5(3H,6H)-diones and 2-substituted benzothieno[3,2-d] pyrimidin-4(3H)-dione by utilizing aza-Wittig reaction was proposed firstly. This synthetic method has the advantage of easily accessible starting material, mild condition and good yields.

具体研究内容如下：1、首次研究了应用aza-Wittig反应方法合成2，3，6，7-对称与不对称四取代噻吩并[2，3-d；5，4-d\']双嘧啶-4，5(3H，6H)-二酮以及2-取代苯并噻吩并[3，2-d]嘧啶-4(3H)-酮衍生物的通用新方法，该方法原料易得，条件温和，收率较高。

Most negative charges are distributed on N(4) and N(1) with N(4) being the most. Above 3000cm-1 C-substituted tetrazoles have more and stronger absorption lines than the corresponding N-substituted isomers.

环负电荷主要分布在N(4)和N(1)原子上且N(4)较N(1)为多。C-取代物的IR光谱在3000cm-1以上有较强吸收而N-取代物则较小，且前者的强吸收线多于后者。

Synthesis of N-substituted carbametes catalyzed by ionic liquids Ionic liquids were introduced into the syntheses of N-substituted carbamates from alkyl carbamates and amines.

离子液体为催化剂合成N-取代氨基甲酸酯将离子液体引入到小分子氨基甲酸烷基酯和有机胺合成N-取代氨基甲酸酯反应。

In this thesis, the design, synthesis and application of substituted 1,8-naphthalimides and napthopyrones conjugated with uridine, substituted 1,3,5-triazine, 1,2-dibromoethane, ethyl bromoacetate have been studied.

本论文研究了取代l，8-萘酰亚胺和萘并吡喃酮与尿苷、取代均三嗪、二溴乙烷、溴乙酸乙酯偶合和双l，8-萘酰亚胺之间偶合的设计、合成及应用。

This research utilized the method of organic synthesis, researching different amounts and positions of hydroxy-substituted benzoic acid and serotonin into amide reaction, so as to produce a series of polyhydroxy substituted N-benzoylserotonin derivatives (compound 1-10). Accordingly, this study conducts the following four tests. I. The activity of antioxidant and the experiment of ability to scavenge DPPH free radical, II. The ability of overall antioxidant—the activity of TEAC, III. The activity test of inhibit Tyrosinase, and IV. The study of absorbing UV / VIS Spectrophotometers. This study use trolox, arbutin, and octyl salicylate as the control groups, and to test the ability of anti-oxidation, the activity of inhibit Tyrosinase, and the ability of absorbing UV. This research ultimately intends to investigate the applied value of those compounds into cosmetics.

本研究主要利用有机合成的方法，将不同数量及不同位置的羟基取代苯甲酸化合物与色洛冬宁进行醯胺化反应后，得到一系列的多羟基取代之N-色洛冬宁苯甲醯胺衍生物（化合物1 ~ 10），进行四种不同活性测试方法：一、清除DPPH自由基能力抗氧化活性测试；二、总抗氧化能力活性测试；三、抑制酪胺酸酶活性美白测试；四、紫外线／可见光光谱仪吸收测试，并以水溶性维生素E、熊果素、水杨酸辛酯当作对照组，探讨其抗氧化能力、抑制酪胺酸酶的活性能力与吸收紫外线能力，再进一步探讨其应用於化妆品上的价值。

This example was substantially the same as Example 1 except that the laminated film was substituted by the modified laminated polymer film of the present invention prepared according to the above-described method.

仔细研究了你译的该句，的确很专业。本来对这个问题心里还真有点郁闷，现在觉得的确不冤。觉得还是看到自己的差距好，这样对自己才有较为正确的认识。欢迎拍砖！

But Severus escaped the hands of those that Julianus had sent to murder him and sent a letter to the praetorian guard, giving them the signal either to desert Julianus or to kill him.

赛维鲁总算逃过了尤利阿努斯派来的杀手，并写了一封信给罗马的禁卫军，向他们发出信号，要么抛弃尤利阿努斯，要么干掉他。他们立即服从了。

This text is in terms of this of " human nature ", it is under the influence of western literature human nature thought to probe into, awakening in human nature of novel works and all sorts of limitations that affectionate The school of Mandarin Duck and butterfly.

本文便是从"人性"这一角度，探讨在西方文学人性思想的影响下，清末民初鸳鸯蝴蝶派的言情、哀情小说作品在人性方面的觉醒与种种局限。