香豆素

In particular, when the Knoevenagel condensation of 2-hydroxybenzaldehyde was conducted with ethyl 2-cyanoacetate, 3-ethoxycarbonylcoumarin was obtained by simultaneous cyclization and alcoholysis of cyanide.

当反应底物为水杨醛与氰基乙酸乙酯的时候，产物为3-乙氧基羰基香豆素，这是水杨醛和氰基乙酸乙酯缩合关环，再发生氰基醇解的产物。

Activities of Aminopyrine N-demethylase, Ethoxycoumarin O-deethylase and Glutathione S-transferase in the hepatopancreas and gills of Fenneropenaeus chinensis were measured by UV spectrophotometry and fluorospectrophotometry. The effects on the activities of APND and ECOD、GST in the hepatopancreas and gills were studied following multi-oral baicalin.

用紫外分光光度法及荧光分光光度法测定中国对虾肝胰腺及鳃氨基比林－N-脱甲基酶、乙氧基香豆素－O-脱乙基酶、谷光甘肽－S-转移酶几种药物代谢酶的活性，探讨黄芩苷对上述几种酶活性的影响。

Coumarin in melilotus was extracted in the method of steam distillation, and the content of coumarin in product was less than 2% and plentiful tar as the by-product was found at the same time.

采用水蒸气蒸馏法对草木樨中的香豆素进行提取，其提取物中香豆素的含量不到2%，并伴有大量的焦油产生。

Oil film thickness along the piston skirt in motored engine was measured, and the comparison with theory result was given.

最后在实验研究中，本文国内首次在活塞裙部油膜厚度中采用了激光荧光诱导的测试方法，主要工作是：分析了激光荧光诱导法的基本原理，建立了测膜厚的基本定量关系模型，通过实验分析了膜厚测试的各种影响因素，通过实验对不同香豆素荧光光谱和激发光谱特性进行了分析，通过实验确定了选取香豆素的种类和溶液浓度的基本原则，自主开发了以光纤为光学光路的测试系统并对系统进行了标定，对内燃机冷拖动状态的活塞裙部进行了实测，并与理论测试结果进行了对比。

Coumarinyloxy)-6-methoxyl-7-hydroxycoumarin,β-sitosterol, 3-stigmast-5-en-3- 3 -D-Glucopyranoside . 3-(7-coumarinyloxy)-8-(7-hydroxycoumarin-8-yl)-7-hydroxycoumarin rhamnoside and Sucrose. Compound I , V, IX and XI were isolated from barks and stems of this plant for the first time and compound VI and VI were isolated from flowers of this plant for the first time, too.

共鉴定了其中11个化合物，根据理化性质和波谱数据鉴定确定为：丁香甙，结香甙C(Edgeworoside C Ⅱ)，7-羟基香豆素(7-hydroxycoumarin Ⅲ)，5，7-二甲氧基香豆素(5，7-dimethoxycoumarin Ⅳ)，卫矛醇，异吲哚-1，3-二酮1H-iso-Indole-1，3(2H-dione Ⅵ，西瑞香素(Daphnoretin Ⅶ)，β-谷甾醇(β-sitosterol Ⅷ)，胡萝卜甙(Daucosterol Ⅸ)，结香甙A(Edgeworoside A Ⅹ)和蔗糖。

The interaction between bovine serum albumin and such a natural pharmaceutical homologue as coumarin, umbelliferone and aesculetin was investigated using fluorescence spectroscopy and ultraviolet spectroscopy.

运用荧光光谱、紫外光谱法研究了三种香豆素中药小分子与牛血清白蛋白的相互作用。实验结果表明，香豆素类小分子能够插入BSA分子内部与BSA形成基态复合物导致BSA内源荧光猝灭，猝灭机理主要为静态猝灭和非辐射能量转移。

The absorption and transport of umbelliferone, osthole, columbianadin, columbianetin acetate, angelolA and angelolB are passive diffusion as the dominating process in Caco2 cell monolayer model.

为了考察独活中香豆素类化学成分在整体口服实验中能否被吸收和吸收程度，本文首先采用Caco2细胞单层模型［8］研究独活中的主要化学成分伞形花内酯、甲氧基欧芹素、二氢欧山芹素、二氢欧山芹醇乙酯、当归醇A和当归醇B的吸收和转运。6种香豆素类成分的化学结构见图1。

Coumarins are a group of important natural compounds, and have been found to have multi-biological activities such as anti-HIV, anti-tumor, anti-hypertension, anti-arrhythmia, anti-osteoporosis, assuaging pain, preventing asthma and antisepsis.

香豆素是自然界很重要的一大类天然有机化合物，实验研究发现香豆素类化合物具有抗HIV、抗癌、降压、抗心律失常、抗骨质疏松、镇痛、平喘及抗菌等多方面生物学活性。

Three novel single-singlet energy transfer pairs between ketocoumarin dyes and rose bengal BNa〓 Salt were designed and their properties were studied in micelles and vesicle.

以合成的香豆素染料作为能量给体，以孟加拉玫瑰钠盐作为能量受体，设计了三对新型的能量传递对(即：香豆素染料-孟加拉玫瑰钠盐)，研究了它们在胶束或囊泡中的能量传递，其结果如下

A UV method was adopted to analyze the furanocoumarin content in four types of citrus essential oils: orange oil, lemon oil, grapefruit oil and bergamot oil. A liquid-liquid separation technology was investigated to remove these furanocoumarins, and then furancoumarin free essential oils were obtained.

采用UV技术测定了四种市售芳香疗法用柑橘类精油：橙油、柠檬油、葡萄柚精油与佛手柑精油中呋喃香豆素的含量，并使用液－液萃取分离技术对这四种精油进行了脱呋喃香豆素类化合物试验，开发研制了四种脱敏精油。

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