查询词典 acid-base

Started from D-tyrosine, we obtained the tetramic acid 96 using Jouin reaction. The assembly of the second fragment 109 was stared from 1,4-butandiol,using asymmetric alkylation reaction developed by Oppolzer as a key step. Coupling of the tetramic acid 96 with 109 provided the key intermediate 110 according to Yoshii\'s procedure. After remove protective group and Sharpless epoxidation, we obtained the key intermediate 113. Its macrocyclization to form the final product is in progress.

本论文的第二章主要对Macrocidin A开展了合成工作，我们从D构型的酪氨酸出发，经过官能团转换；利用Jouin反应生成Tetramic acid 96，另外一个片断从1，4-丁二醇开始经过多步反应生成碘化物104，利用Oppolzer发展的手性樟脑磺酰胺为辅基参与的不对称烷基化反应，引入手性甲基，生成关键中间体109，接着通过Yoshii发展的方法连接96和109生成110，经过Sharpless不对称环氧化反应建立环氧化合物，然后脱去保护基得到关环前体113，分子内的Mitsunobu反应进行关大环反应正在进行之中。

For example, the fatty acid, arachidonic acid is essential for cats but not for dogs.

例如， arachidonic acid 这种脂肪酸对猫是必要脂肪酸，对狗却不是。

Objective: To observe the differences of serum kynurenine and kynurenic acid between schizophrenia and healthy controls. To observe the changes of serum kynurenine and kynurenic acid among clinic types of schizophrenia.

目的：探讨血清中犬尿氨酸（kynurenine， KYN）及犬尿喹啉酸（kynurenic acid， KYNA）的含量在精神分裂症(schizophrenia， SCH)患者与正常对照组人群之间的差异性，同时探讨血清中KYN及KYNA的含量在SCH患者各临床分型之间的差异性。

Compounds were identified by means of physic-chemical property and spectral data including three new compounds: platyphyllin A (1), neochlorgeniclatone (2),(2E,6Z)-2,6-dimethyl-8-O-β-D-glucosyl-2,6-octadienoic acid (3). The known compounds included cyclic diarylheptanoids, phenylic acid, ect.

从白桦叶的水提取物中，利用各种色谱分离手段(硅胶柱色谱、聚酰胺柱色谱、凝胶柱色谱及制备薄层色谱等)，分离得到28个化合物，通过理化性质及各种波谱数据(NMR，MS，IR，etc)鉴定了23个化合物的结构，其中新化合物三个：platyphyllin A(1)，新绿原酸内酯(neochlorgeniclatone，2)，(2E，6Z)-2，6-二甲基-8-O--2，6-辛二烯酸(2E，6Z-2，6-dimethyl-8-O-β-D-glucosyl-2，6-octadienoic acid，3。

Macrocidin A is a macrocyclic tetramic acid with herbicidal activity that isolated from the culture of Phoma macrostoma.In the second chapter of this thesis, our synthetic studies to macrocidin A were discussed.

Macrocidin A是加拿大化学家Graupner从Phoma macrostoma培养液中的代谢物分离得到环状乙酰型Tetramic acid天然产物，研究表明这类新的Tetramic acid化合物具有很强的除草活性。

The main work of this dissertation is constructing Arabidopsis gain of function mutants pool, screening mutants related to plant defense response, cloning the genes and studying their functions. The main results are as following:(1) Arabidopsis in planta transformation were made by Agrobacterium tumefaciens carrying the activation tagging vector pSKI015 with herbicide-resistant Bar gene as a selective marker. About 12000 independent transformant lines were acquired by the above method from which two mutants related to plant defense response and development, asr1 (auxin and salicylic acid responsive 1) and dai1 (drought tolerant and abscisic acid insensitive 1) were isolated.

本文以拟南芥为实验材料，以激发标签为技术平台，构建了拟南芥的功能获得突变体库，从中筛选具有抗病、抗逆表型的突变体，克隆基因并进行基因的功能研究，取得的主要结果如下：(1)利用含激发标签质粒pSKI015的农杆菌直接转化拟南芥植株，以抗除草剂的Bar基因为筛选标记，获得了约有12000个独立转化株系的突变体库，并从中筛选到2个与抗病、抗逆和发育相关的突变体asrl(auxin and salicylic acid responsive l)和dail(dought tolerant and abscisic acidinsensitive l)。

Taurocholic Acid is a kind of tauro-conjugated bile acid which exists in many kinds of animals' bile.

牛磺胆酸(Taurocholate acid， TCA)是存在于多种动物胆汁中的一种结合型胆汁酸。

Two of today's best -selling brands of full-strength prescription medication for the relief of excess stomach acid, Acid-Ease and Pepticaid, are now available in milder nonprescription forms.

消费者产品杂志上的文章：两种现在最好卖的消除过多胃酸的全效处方药Acid-Ease和Pepticaid现在出现在了较温和的非处方药清单上。

L$ s Two of today's best -selling brands of full-strength prescription medication for the relief of excess stomach acid, Acid-Ease and Pepticaid, are now available in milder nonprescription forms.

消费者产品杂志上的文章：两种现在最好卖的消除过多胃酸的全效处方药Acid-Ease和Pepticaid现在出现在了较温和的非处方药清单上。

Two of today's best -selling brands of full-strength prescription medication for the relief of excess stomach acid, Acid-Ease and epticaid, are now available in milder nonprescription forms.

消费者产品杂志上的文章：两种现在最好卖的消除过多胃酸的全效处方药Acid-Ease和Pepticaid现在出现在了较温和的非处方药清单上。

Fancy gold-plated dangling earrings with facetted White Opal crystals.

花式镀金悬垂耳环与facetted白欧泊水晶。

This essay chooses the study aim from biology teachers in middle school in Shi Jiazhuang which tells us that most of the middle school biology teachers in Shi Jiazhuang have the"burnout", lower successfulness, individualize.

本文选取石家庄市初中生物教师作为研究对象，运用问卷调查的方法对石家庄市初中生物教师职业倦怠的现状进行调查，调查结果发现，石家庄市初中生物教师这一群体普遍存在职业倦怠，情感枯竭程度偏高，成就感偏低，去个性化程度最为严重。