酸碱的

A pyrimidine base, C5H6N2O2, that is an essential constituent of DNA.

一价的在酸碱反应中只有一个氢离子转移到碱上的；一碱价的

This methods of sensory evaluation and Thiobarbituric acid value were used to study the effect of active carbon, cyclodextrin, yeast on the fishy flavor's removing of the acid-/alkali-isolated silver carp protein, furthermore, study the mechanism of the fishy flavor's removing by yeast, using the simultaneous distill extraction technology.

通过感观评定，测定硫代巴比妥酸值，研究了酸碱法对鱼肉蛋白腥味的影响及活性炭、环糊精、酵母发酵的脱腥效果，并应用蒸馏萃取－气相－质谱技术研究了酵母发酵对碱提蛋白风味的影响及脱腥机理。

Set up a curvilineal equation of acid-base titration,and every pHysics meanings in the equation and factors of the effect its titrate suddenly jump range were discussed.

建立了酸碱滴定的滴定曲线方程，并讨论了方程中各项的物理意义及影响滴定突跃范围的因素。

The change of activity,specific rate,turnover frequency,acid coverage and the coverage ratio of acidic to alkalic surface area had a similar regularity with the change of the state and the composition of iron oxide precursor of catalyst.

随着母体铁氧化物性质和组成的变化，催化剂活性、质量反应速率、合成氨转换频率和表面酸覆盖度及其酸碱覆盖度的比例有相似的变化规律，即与Fe2+/Fe3+呈驼峰形变化曲线。

Isotherms of benzothiophene on the activated carbon were separately measured at different temperature, and then the variation of the adsorption of benzothiophene on the activated carbon was discussed with the help of the hard and soft acid and base principle.

结果表明，活性炭表面负载Ag^＋、Ni^2＋、Cu^2＋或Zn^2＋离子，可提高活性炭吸附苯并噻吩硫化物的能力，而活性炭表面负载Fe^3＋或Co^3＋离子，反而降低了活性炭吸附苯并噻吩硫化物的能力，这主要是活性炭表面的酸碱性质发生变化。

The factors affect on the degree of substitution of product, yield and apparent viscosity, such as the mol rates of EPTAC with -NH2, reaction temperature, reaction time and the content of water in system have been discussed in detail. FTIR spectrometer and UV spectrometer are used to characterize the structure of the derivative and it is proved that substitution reaction mainly occurs on the -N element .The particle size and morphology of chitosan and quantemary ammonium salt of chitosan are analysised by comparing photos of their scanning electron microscope. The degree of substitution of HACC is determined by acid -base conductometric titration. An error in current formula of DS has pointed out and a correct formula has presented.On the base of experience of above experiment, the reaction conditions of HACC were systematically investigated through orthogonal design, and then the best conditions are found. Water-solubility and dependence of pH are studied.

壳聚糖和环氧丙基三甲基氯化铵在异相条件下发生反应，通过单因素实验，制备了一系列不同性能的壳聚糖季铵盐，本文首次详细讨论了反应条件(反应摩尔比、反应时间、反应温度、水含量)对产率及产物性能的影响；用红外光谱和核磁共振对结构进行表征分析时，发现季铵盐阳离子基以N位上取代为主；通过电镜图片对壳聚糖和季铵盐衍生物外观形貌进行对比，采用酸碱电导滴定法测定产物的取代度，并对常用取代度公式做了修正。

Also, the influence of fungal endophytes and plant growth regulators on Festuca arundinacea is looked at. In addition, the biochemical identification of Festuca arundinacea varieties, as well as the use of transgenesis in genetic engineering, were looked at.

在研究和大量借鉴国内外最新研究成果的基础上，系统论述和报道了高羊茅在水分、温度、酸碱盐以及重金属等逆境胁迫下的生理变化，也包括内生真菌和植物生长调节剂对高羊茅的影响。

Effect of Common Goldenrod Herb on rats Gastrelcosis Caused by Indocin;2. Animal Model of Helicobacter pylori Infection in BALB/c Mice with Gastrelcosis ;3. AIM To study the synthesis of zinc chlorin e 4 (1), its experimental antigastrelcosis activity as well as the protection against acute liver injuries.

蚕沙叶绿素粗品经酸碱降解反应制得二氢卟吩e6(3)，3经吡啶回流降解制得二氢卟吩e4 (2 )，2与醋酸锌络合制得 1；并测定 1对消炎痛诱发的大鼠胃溃疡的保护作用及对硫代乙酰胺、四氯化碳所致小鼠急性肝损伤的防治作用。

In this article, weh ave utilized the ABEEM-σπ model to research this kind of reactions. Through regional softness values of both the atoms and π bonds, which are calculated by this model, we have interpreted properly the typical and particular stereoselectivity of Diels-Alder reaction. Furthermore, we also have initiatorily probed into the rationality and feasibility in terms of synthesizing heteroatomic -ring compounds using Diels-Alder reaction.

本文利用ABEEM-σπ模型对此类反应进行了研究，通过计算原子和π键区域的电荷分布和局域软度，结合局域硬软酸碱原理对Diels-Alder 反应的立体选择性给出了合理解释，而且还初步探讨了利用Diels-Alder 反应合成杂环化合物方法的合理性和可行性。

Under isocratic elution condition including pH of the buffer solution, separation voltage and the ratio of organic solvent in the buffer solution.

首先以等位冲堤的方式，寻找最佳的实验参数，其参数包含缓冲溶液酸碱值，操作电压及有机修饰剂在缓冲溶液中的比例。

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。