查询词典 acid

The direct incorporation of U-13C glucose was estimated by the intensity increase of m/z to F(F was parent fragment, and n was the carbon number in the fragment), while the total isotope incorporation from the added 13C could be calculated according to the abundance ratio increment summation from m/z (Fa+1) through (Fa was the fragment containing all original skeleton carbons, and T was the carbon number in the amino acid molecule). The 13C enrichment in the target compound was expressed as atom percentage excess, and that of D-amino acid needed to be corrected by the coefficient of hydrolysis-induced racemization. The 13C enrichment reflected the carbon turnover velocity of individual amino acid enantiomers, and was powerful to investigate the dynamics of soil amino acids.

外加葡萄糖直接合成氨基酸的比例可利用质谱碎片的相对强度变化来评价（n为质谱碎片F中含有的碳原子数目）；而源于葡萄糖的13C同位素在氨基酸分子中的富集程度是所有同位素峰相对强度变化的总和。13C在目标化合物中的富集比例用原子百分超评价，D氨－基酸的APE还需进一步利用水解诱导的外消旋化系数校正。13C在目标化合物中的富集程度可反映各氨基酸手性异构体的碳循环速率大小，是研究土壤氨基酸动态变化的有力工具。

Citric acid anhydride was synthesized by citric acid and acetic anhydride with acetic acid as solvent.

以柠檬酸和乙酸酐为原料，乙酸为溶剂合成柠檬酸酐。

Acetylsalicylic acid was synthesized from salicylic acid and acetic anhydride catalyzed by strong-acid cation exchange resin.

以水杨酸和乙酸酐为原料、强酸阳离子交换树脂为催化剂合成阿司匹林。

A plot of absorbency versus the total concentration drop of ascorbic acid yields a straight line. The shelf-life of ascorbic acid solution calculated was 444 d (or 152 d) with sodium metabisulfite, indicating that sodium metabisulfite increases the stability of ascorbic acid significantly.

根据建立的动力学方程，从理论上计算得在维生素C溶液中加焦亚硫酸钠时的贮存期分别为444 d(或152 d)，表明加入焦亚硫酸钠能显著延长维生素C溶液的贮存期。

The topic is on the basis of a hydrochloric acid mist emissions from factories and design of an assay using the general industrial emissions of hydrochloric acid Department Jimmy installation that acid absorber.

本课题就是根据某工厂排放盐酸雾的情况而设计的一种利用吸附法对一般工业盐酸废气的处理装置，即酸雾吸附器。

The resultant precipitation —— acid rain is a dilute mixture of sulphuric acid and nitric acid.

由此产生的沉降物——酸雨是稀释后的硫酸和氮酸的混合物。

The existence of acid deposition or acid precipitation has been known for years. Only in recent years, however, has acid deposition been recognized as a problem.

酸性排泄物和酸性降落物的存在已被知晓了许多年，但仅在最近几年酸性排放物被认为是一个环境问题了。

The results indicated that the leaching of acid rain led to increasing of latent acid of soil in short time though amortizing of soil to acid precipitation.

许多研究认为，人为酸化的因素主要有大气污染引起的酸雨输入 [2、3] 和施入氮肥引起的硝化作用 [4、5] 两方面。

Experimental results indicated that performic acid and hydroxyl radical produced in 30% H2O2-HCOOH-Fe(superscript 2+) were combined to oxidize model organic sulfide with desulfurization ratio of over 96%. Catalytic performance of the combination of Fe(superscript 2+) and formic acid was higher than thin of only formic acid.

实验结果表明：30%H2O2-HCOOH-Fe(上标 2+)产生的过氧甲酸和羟基自由基能迅速将模型有机硫化合物氧化，氧化脱硫率可达到96%以上，Fe(上标 2+)和甲酸的催化氧化性能明显优于单纯使用甲酸。

First, the speed of the reaction between mud acid and rock is very fast, the effective distance of acid is short, active acid can not reach deep formation.

首先，高温下常规土酸与地层矿物反应速度极快，酸液有效作用距离短，活性酸不能到达地层深部；其次，HF与铝硅酸盐的化学反应不是简单的一次反应，其副产物氟硅酸和氟铝化物还可与铝硅酸盐发生二次反应和三次反应，形成一系列不溶性的沉淀物，对储层造成严重伤害；第三，高温情况下酸液对井下管柱及工具腐蚀性很强，对缓蚀剂性能要求高。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。