查询词典 acid

This article uses the tetramethyl ammonium hydroxide∕methyl iodide for methyl esterification and the method of temperature program ,determine the content of lactic acid, ethanoic acid, propionic acid, butyric acid.

使用四甲基氢氧化铵/碘甲烷对青贮料浸出液进行甲酯化反应，采用程序升温的方法，同时测定青贮料中乳酸、乙酸、丙酸、丁酸的含量。

Aspartic acid An AMINO ACID formed by transamination, in which the amino group of dlutamic acid is transferred to oxaloacetic acid.

天冬氨酸：由转氨基作用形成的一种氨基酸，谷氨酸的氨基基团被转移到草酰乙酸中。

A range of waterborne alkyd resins has been prepared by fatty acid process, based on soybean fatty acid, trimellitic anhydride, and various polyols and polybasic carboxylic acids, which are modified with benzoic acid, maleic anhydride and oleic acid.

通过脂肪酸法，选用豆油脂肪酸、偏苯三甲酸酐和不同的多元醇、多元酸制备了一系列水性醇酸树脂，用苯甲酸、顺丁烯二酸酐和油酸对其改性进行了研究。

TrithiocarbonatesS,S\'-bis (α,α′-dimethyl-α-acetic acid) trithiocarbonate (TTC1),3-(2-carboxyethylsulfanylthiocarbonylsulfanyl) propionic acid (TTC3),2-(2-carboxyethylsulfanylthiocarbonylsulfanyl) propionic acid (TTC4) and2-(2-carboxyethylsulfanylthiocarbonylsulfanyl)-2-methylpropionic acid (TTC5) weresynthesized by phase transfer method.

用相转移法合成了S，S′-二(α，α′-甲基-α&-乙酸)三硫代碳酸酯(TTC1)、S，S′-二丙酸三硫代碳酸酯(TTC3)、S-丙酸-S′-三硫代碳酸酯(TTC4)和S-丙酸-S′-(α，α′-甲基-α&-乙酸)三硫代碳酸酯(TTC5)。

Approximately some 1/4 unio primary bile acid in the jejunum,the ileum and the colon upside ,with the effect of enzyme's catalysis,produces the deoxycholic acid,the lithocholic acid ,the bear deoxycholic acid and etc.

大约有1/4的结合型初级胆汁酸在空肠、回肠及结肠上段，在细菌的酶的催化下，进一步生成去氧胆酸、石胆酸、熊去氧胆酸等次级胆汁酸。C·胆汁酸的合成：肝细胞合成的胆汁酸与甘氨酸或牛磺酸结合，形成结合型胆汁酸，分泌入胆道。

The method includes the following steps: getting specific amount of knitted or unknitted natural fiber and dipping the natural fiber in the aqueous solution of silane coupling agent for 1-100min, taking out and drying the natural fiber, thus producing natural fiber with modified surface; then pressing the polylactic acid into sheet in a plate vulcanization machine; disposing 2-10 polylactic acid sheets into a die and arranging one modified natural fiber sheet between every two polylactic acid sheets; pressing and molding the sheets; in this way totally biologically degradable polylactic acid composite material can be made.

该方法为：先取一定量的经过编织或未编织天然纤维，将其浸渍在偶联剂水溶液中1～100分钟后取出，经干燥后得到表面改性的天然纤维。然后，将聚乳酸在平板硫化机中压制成薄板；将2～10片聚乳酸薄板放在模具中，且每2片之间放置1片改性的天然纤维，然后模压成型，得到可完全生物降解聚乳酸复合材料。

Among them, p-coumaric acid, cis-aconitic acid, vanillic acid, citric acid were well known antiinflammation active components.

已知对羟基桂皮酸、顺式乌头酸、对羟基苯甲酸、香草酸、柠檬酸具有抗炎活性。

A simple, fast, and reliable method based on capillary electrophoresis with electrochemical detection was developed for the separation and determination of rutin, ferulic acid, vanillic acid, chlorogenic acid, quercetin and caffeic acid in Radix Astragali and its medicinal preparations.

采用毛细管电泳－电化学检测法对中药黄芪的主要活性成分芦丁、阿魏酸、香草酸、绿原酸、槲皮素和咖啡酸进行了分离和测定。

MeJA treatment induced vanillic acid and caffeic acid productions; whereas treatment of MeSA and the damage caused by third instar larvae of the maize stalk borer induced the production of only caffeic acid and p－Hydroxybenzoic acid respectively.

三种浓度的MeJA处理均使根际土壤细菌群落相似性指数显著降低，6μL/L的MeJA处理使细菌群落的多样性指数显著降低。

The third category is planted second-generation Chinese fir, the soil phenol content is highest. It shows that along the ecosystem conversion, or as the increase of Chinese fir planted generation, the phenols in soil are accumulated to a certain extent.(6) Detecting the soil of four systems and found that there exist p-hydroxybenzoic acid, vanillic acid and ferulaic acid, but not exist cinnamic acid.

根据主成分分析结果，大致可以把4种系统分成3类，第一类为天然更新常绿阔(来源：ABC论文8f网www.abclunwen.com)叶林，其土壤酚含量低；第二类为老龄杉木林和二代杉木萌芽天然更新林，其土壤酚含量较高；第三类为二代杉木人工林，其土壤酚含量最高。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。