酸性反应

Samples were saponified with 20 g/L sodium hydroxide. The sexual hormones were then extracted with dichloromethane-acetic acetate (40∶1, v/v) under acidic conditions (pH 3, adjusted with 1 mol/L HCl ). An XTerraTMRP18 column was employed and a mixture of water-methanol-acetonitrile (50∶32∶18, v/v) was used as mobile phase. The seven sexual hormones were detected at 230 nm. The average spiked recoveries for the seven sexual hormones ranged from 75.6% to 97.8% with relative standard deviations of 1.9% to 7.2%. The linear ranges of determination were from 5 to 50 mg/L with correlation coefficients of 0.9999, and the limits of detection were from 3.7 to 12 ng.

先在试样中加入20 g/L氢氧化钠溶液与油脂进行皂化反应，然后用二氯甲烷-乙酸乙酯(体积比为40∶1)混合液在酸性条件下(pH 3)萃取，选择XTerraTMRP18色谱柱，以水-甲醇-乙腈(体积比为50∶32∶18)混合液为流动相，在波长230 nm处检测。7种性激素分离良好并排除了样品中杂质峰的干扰，低、高浓度平均回收率范围为75.6%~97.8%；相对标准偏差为1.9%~7.2%；检出限为3.7~12 ng。

The effects of gastrodine on the expression of glial fibrillary acidic protein, the transuding amount of lactic dehydrogenase, and the activity of nitric oxide synthase in cultured astrocytes of young rats with lesions caused by simulated cerebral ischemia and reperfusion, were determined in this experiment.

观察天麻素对脑缺血再灌注损伤星形胶质细胞胶原纤维酸性蛋白表达、乳酸脱氢酶漏出量以及一氧化氮合成酶活性的影响。结果：天麻素大、小剂量组GFAP纤维样改变减轻，强阳性反应细胞数减少；LDH漏出量下降；NOS活性减弱。

An acid bath used to stop the action of a developer.

用于停止显影剂反应的酸性溶液。

Photocatalytic activity of the catalyst was investigated for microwave assisted photocataqlytic degradation of acid mordant red B dye in aqueous solution.

通过可溶性染料酸性媒介红 B的微波辅助光催化氧化反应，考察了其光催化活性；并研究了复合催化剂的煅烧温度、铈掺杂量和涂覆次数等对催化活性的影响。

The essay studies dye wastewater sewage of four different structures Acid OrangeⅡ、Alizarin Violet、Neutral Red、Fuchsin Basic with the techniques of catalytic oxideFe~(3+)/H_2O_2, Cu~(2+)/H_2O_2, Fe~(3+)/Cu~(2+)/H_2O_2 and examines the original PH value, period ofresponse and the effects of different proportion of Fe~(3+)and Cu~(2+) on the process to treatsewage and explores the process of techniques in Fe~(3+)/Cu~(2+)/H_2O_2 system.

用Fe~(3+)／H_2O_2、Cu~(2+)／H_2O_2、Fe~(3+)／Cu~(2+)／H_2O_2催化氧化工艺对四种不同结构的模拟染料废水酸性橙Ⅱ、茜素紫、中性红、碱性品红进行了研究，考察了初始pH值、反应时间及不同Fe~(3+)、Cu~(2+)比对处理过程的影响，探讨了Fe~(3+)／Cu~(2+)／H_2O_2体系的工艺流程。

Results show that acid value of carboxylic wood powder from alkaline hydrolysis is higher,but its yield is lower than that from acid hydrolysis. The adsorption capacity of carboxylic wood powder for basic pink dye increased with increase of the initial concentration of the adsorbate,and could be kept over 500mg/g after repeated use and regeneration for 4 times.

实验结果表明：（1）在适量引发剂（FeSO4 * 7H2O=1g）和适当温度（60℃）作用下，可得到较高接枝增量和接枝率的PANW；（2）在PANW的水解反应中，在碱性催化剂作用下，可得到羧基含量高的产物，但收率较低；而在酸性催化剂作用下，则得到羧基含量低的产物，但收率较高；（3）羧基木粉对阳离子型染料--碱性桃红的吸附容量与起始浓度有关，本实验中，羧基木粉对碱性桃红的吸附容量最高可达500mg/g，对Cu2+的吸附容量最高可达39mg/g；（4）经0.3mol/LHCl再生4次后，羧基木粉对碱性桃红的吸附容量保持在440mg/g以上，在含有多种金属离子的溶液中，羧基木粉优先吸附Fe3+等硬酸型离子。

"Most paints can tolerate mildly acidic reaidues better than alkaline residues or from cleaners,or indeed the iron oxide or rusted steel which also has an alkaline reaction."

绝大多数的油漆能忍受弱酸性的渣滓，却不能忍受清洁剂中的碱性渣滓，事实上铁氧化物或生锈的钢都有碱性反应。

First, by using p-methoxybenzaldehyde , p-hydroxybenzaldehyde and pyrrole as raw materials, 5-(p-hydroxyphenyl)-10,15,20-tri(p-methoxyphyenyl)porpyrin was prepares under acidity condition and the let reacted with benzoyl chloride, o-nitrobenzoyl chloride, m- nitrobenzoyl chloride and p- nitrobenzoyl chloride respectively under alkalinity condition with DMF as solvent.

以对-甲氧基苯甲醛、对-羟基苯甲醛和吡咯为原料，在酸性条件下合成了5-对羟苯基10，15，20-三对甲氧苯基卟啉，再以该化合物为原料分别与苯甲酰氯、邻-硝基苯甲酰氯、间-硝基苯甲酰氯和对-硝基苯甲酰氯反应，在碱性条件下以DMF为溶剂合成了四种目前尚未见文献报道的对-甲氧基卟啉硝基苯甲酸酯类化合物。

Methods:Vanadium was determined by dual-wavelength catalytic spectrophotometric method which was based on the vanadium catalyzing oxidation of acridine orange and acid chrome blue K by potassium bromate in 0.010 mol/L H2SO4 medium.

在硫酸介质中，利用钒催化溴酸钾氧化吖啶橙和酸性铬蓝K褪色反应，分别在476 nm和556 nm处测量催化体系和非催化体系的吸光度的变化，用双波长催化光度法测定痕量钒。

Compared with the MgO prepared by direct thermal decomposition of the MgO precursor, the novel high-specific-surface-area MgO material contains more strong basic sites and less acidic sites and exhibited higher acetone yield and selectivity in isopropanol decomposition, making it a potential solid base catalyst.

与直接焙烧四水乙酸镁制得的MgO相比，这类新型高比表面积MgO具有较多的强碱位和较少的酸性位，并在异丙醇催化分解反应中表现出更高的丙酮收率和选择性，有望成为一类优良的固体碱催化剂。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。