烯

So we researched the relationship between the acraldehyde contamination and cooking activity. We choose four time, 9:00 and 15:00 the cooking activity is very few, so the contamination is low, but 11:30 and 17:30 the contamination is very high, this concentration is 2.6 times an much as the front one.

检测结果表明丙烯醛的浓度和烹饪活动的多少有密切的关系。9：00和15：00食堂内烹饪活动比较少，丙烯醛的浓度明显降低，而11：30和17：30是两个就餐高峰，在这两个时间段内餐厅内的丙烯醛浓度明显升高。

The cytotoxicity of these compounds were valuated by MTT and SRB methods using three cancer cell lines: HL-60, A-549, P-388. Cyclo-shikonin, and cyclo-alkannin have high cytotoxicity against HL-60.The chiral center of side chain has no effect on their activity. 2- 1-(Acetyloxy-4-methyl-3-pentenyl -5, 8-dihydroxy-1, 4-naphthoquinone (105) has strong inhibition effect on P-388 cells. 2- 1-(isooctyloxy-4-methyl-3-pentenyl -5, 8-dihydroxy-1, 4-naphthoquinone (108) and 2- 1-(2-furoyloxy-4-methyl-3-pentenyl -5, 8-dihydroxy-1, 4-naphthoquinone (112) have high inhibition on A-549.Shikonin (1), alkannin (2), and their derivatives have the structural features of a planar chromophores and short side chain. We examined the ability to inhibit the telomerase.

抗肿瘤活性初步筛选测试采用小鼠白血病P-388肿瘤细胞和人肺癌A-549肿瘤细胞进行，结果表明侧链羟基的手性对抗肿瘤活性无明显影响；有数个化合物具有很好的体外抑制活性，特别是化合物2-（1-异辛酰氧基-4-甲基-3-戊烯基）-5，8-二羟基-1，4-萘醌（108）和2-[1-（2-呋喃甲酰氧基）-4-甲基-3-戊烯基]-5，8-二羟基-1，4-萘醌（112）体外显示对人肺癌A-549肿瘤细胞有强效；2-（1-乙酰氧基-4-甲基-3-戊烯基）-5，8-二羟基-1，4-萘醌（105）对小鼠白血病P-388肿瘤细胞有强效；环紫草素和环异紫草素对人白血病HL-60细胞有强烈抑制作用。

Methods: Sonogashira coupling reaction of terminal alkyne and-β-iodovinyl sulfone was used to synthesis the product.

通过端炔与烯基砜发生了Sonogashira偶联反应，生成含共轭烯炔结构单元的药物前体烯基砜。

E. 3-allyloxyisothiazole and N-allylisothiazolone, were synthesized with 3-mercaptopropionate as the starting material through ammonolysis, cyclization and allylation reactions.

以3-巯基丙酸甲酯为原料，经氨解、关环、烯丙基化合成了2种含有不饱和侧链的异噻唑类化合物，分别为3-烯丙氧基异噻唑和N-烯丙基异噻唑啉酮。

We have had the extensive studies on theα-acetyl-α-carbamoyl ketene--acetals and its further applications, for example, their adols condensations with aldehydes giveα-alkenoyl-α-carbamoyl ketene--acetals which can be utilized as the 1,5-bielectronic five-carbon components to react with various binucleophlilic species in a [5+1] annulation.

我们小组在以前的工作中对α-乙酰基-α-胺甲酰基二硫缩烯酮在合成中的应用进行了深入的研究，如与醛缩合生成α-烯酰基-α-胺甲酰基二硫缩烯酮，将其作为1，5-双亲电五碳合成子的[5+1]成环策略等。

There is no electron transfer from tetrakis(2-thienyl)tetrathiafulvalene to [60]fullerene containing piperidinoxanthate dyad in benzonitrile in steady-state.

四硫富瓦烯及其衍生物是良好的有机导体及电子给体，噻吩基取代的四硫富瓦烯可作为合成含噻吩及四硫富瓦烯两种电子给体的聚合物的单体。

The epoxidation of of various olefins was carried out using LDH-F with Mg/Al=5 as the catalyst and H2O2 and benzonitrile as the oxidants. This catalytic system has excellent catalytic activity. The conversion and selectivity are both above 95% when using styrene, indene, allyl alcohol, and allyl chloride as the substrates.

以Mg/Al=5的LDH-F为催化剂，H2O2和苯甲腈为氧化剂对不同官能团化烯烃进行环氧化反应，结果表明，此催化体系具有良好的催化性能，在苯乙烯、茚、丙烯醇和烯丙基氯环氧化反应中转化率和选择性均在95%以上。

The GC/MS analysis indicated that the volatile compounds from the plant leaves which is easy to be damaged by Tetraychus vienneis include relative large amounts of cis-3-hexenyl ester acetic acid, cis-3-hexenyl ester butanoic acid and alpha-famesene.

结果表明，植物叶片中的挥发性物质得到了很好的分离，受山楂叶螨危害严重的植物的完好叶片中的挥发性物质均含有顺－3-己烯－1-醇乙酸酯、顺－3-己烯－1-醇丁酸酯和α-法呢烯，且含量较大。

Hexen-1-ol; Hexanal, Hexyl acetate,-Butanoic acid, 2-hexenyl ester, 3-t-Butyl-oct-6-en-1-ol were the characteristic aroma components of sweet cherry fruit.

2-己烯－1-醇、己醛、乙酸己酯、-丁酸－2-己烯酯、3-异丁基－6-烯－1-辛醇是'红宝石'大樱桃成熟果实的特征香气成分。

Among 3 cultivars, B17 occupied the least green odor contents of aromatic constituents, such as 2-hexen-1-ol acetate, butanoic acid 3-hexenyl ester and butanoic acid 3-hexenyl ester, hut had the most fruity, flowery and woody odors such as β-Ionone, 1-nonanol, Acetic acid octyl ester, Methyl benzoate, Ethyl benzoate and theaspirane, which showed that B 17 was superior to the 2 other cultivars in aroma quality.

不同品种的杨桃果实中的所含的香气成分及含量不同，B17杨桃含乙酸－反－2-己烯酯、丁酸－反－2-己烯酯、丁酸－反－3-己烯酯等青香型酯类最低而含β-紫罗兰酮、1-壬醇、乙酸辛酯苯甲酸甲酯、苯甲酸乙酯、茶螺烷等花香型、果香型及木香型成分最高，因而其香气品质要优于B10和新加坡红肉种。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。