酸性

FF-IR results showed that in the strongly acidic, weakly acidic, and basic solutions, the glycine exists in the form of cation, zwitterion, and anion, respectively.

在强酸性、弱酸性和碱性溶液中，吸附态的甘氨酸分别主要以阳离子、两性离子和阴离子形式存在。

Enterobacter aerogenes was irradiated by He-Ne laser to optimize the laser mutagenesis condition, and to test the heredity, aciduric and hydrogen-producing potential of the mutant. An aciduric mutant with steady hydrogen-producing capability, which was able to grow at acidic pH of 3.0, was obtained. Its capability of hydrogen production was measured in the batch culture experiment.

闻建平，陈宇，刘铭辉(天津大学化工学院生物工程系，天津300072)摘要：运用He—Ne激光辐照产气肠杆菌，对激光诱变参数进行优化，考察了突变株的遗传稳定性、耐酸性和产氢特性结果筛选到一株遗传性状稳定的高产氢突变株，具有良好的耐酸性，在pH值3.0 时仍能生长。

This article analyses some basic conceptions that are comparatively vayue or even wrong wrong in the teaching of middle school chemistry, like the definition of chemical change, the influence of concentration on a chemical reaction , the structure of oxacid,and the acidity of sulfuric acid, the acidity of carbonic acid, and the conversion of allotropic substance.

分析了中学化学教学中的几个比较模糊甚至错误的基本概念，如化学变化、浓度对化学反应速度的影响、含氧酸的结构、硫酸的酸性、碳酸的酸性、热化学方程式的表示法、同素异形体间的转化等，并从大学化学角度加以澄清，以便使大一学生更准确地理解和掌握这些基本概念。

The results showed that the red pigment belonged to anthocyanidin, it was soluble in water, stable against heat treatment, light, acid and sugar concentration, tolerant to reduction, but sensitive to alkaline, oxidation and Fe(superscript 3+). The research also showed that acid medium is favorable for extraction. The pigments have more general stability in acid medium and have high ufility value.

结果表明：该色素为水溶性多酚类花色素，在不同的pH环境下显示不同的颜色；其耐热性、耐光性、耐酸、耐糖、耐还原性较好，但耐氧化性、耐碱性较差；Fe(上标 3+)对色素有破坏性；该色素的提取宜在酸性介质中进行，酸性条件下其综合稳定性较优，有较高的利用价值。

The results showed that the red pigment belonged to anthocyanidin,it was soluble in water,stable against heat treatment,light,acid and sugar concentration,tolerant to reduction,but sensitive to alkaline,oxidation and Fe~(3+). The research also showed that acid medium is favorable for extraction.The pigments have more general stability in acid medium and have high ufility value.

结果表明：该色素为水溶性多酚类花色素，在不同的pH环境下显示不同的颜色；其耐热性、耐光性、耐酸、耐糖、耐还原性较好，但耐氧化性、耐碱性较差；Fe3+对色素有破坏性；该色素的提取宜在酸性介质中进行，酸性条件下其综合稳定性较优，有较高的利用价值。

The quality of chlorophyll of wild Aralia elata are unstable to light,heat and acid medium,and in daylight,the decomposing speed of chlorophyll can rise when the time was pro-longed or the temperature was raised.It can be concluded that chlorophyll is easy to compose,while it is ...

叶绿素对光、热、酸性介质均不稳定，易产生降解现象；在散射光环境中，降解速度随时间延长和温度升高而加快；在pH值6～7时的中性条件下最稳定，在pH值3～4的酸性条件下，叶绿素易降解。

Test of electrochemical methods Benzylidene acetone, formaldehyde, compound additive D, ammonium metavanadate solution of acid sulfate tin polarization curves, test ammonium metavanadate on the open circuit potential acid sulfate solution of tin.

用电化学工作站测试分析苄叉丙酮、甲醛、复合添加剂D、偏钒酸铵对酸性硫酸盐镀锡溶液的极化曲线的影响，测试偏钒酸铵对酸性硫酸盐镀锡溶液开路电位的影响。

Benzylidene acetone desorption potential acid sulfate tin plating solution is very close to the ideal desorption potential; Benzylidene acetone, formaldehyde can regulate the desorption potential role and can increase the current density range; Composite additive D can make acid sulfate tin plating solution in the hydrogen produced during the rapid detachment; Ammonium metavanadate can catalyze Sn4+ and restore to Sn2+, and then make solution stability.

苄叉丙酮的脱附电位很接近酸性硫酸盐镀锡溶液的理想脱附电位；甲醛具有调节苄叉丙酮脱附电位的作用，并且能够增大电流密度范围；复合添加剂D能够使酸性硫酸盐镀锡溶液在电镀过程中产生的氢气迅速脱离；偏钒酸铵能够催化Sn4+还原为Sn2+，从而使镀液稳定。

The optimal process parameters and conditions were introduced as following: the best stripping effect with dosage of blankit 2.0g/L and one bath redyeing process with disperse and ANOSETWPN acid dyestuffs at 105~115℃, 15~20min.

实验得出，漂毛粉浓度控制在2.0g/L时，剥色效果最佳；染色选用ANOSEWPN酸性染料，采用分散／酸性－浴法进行染色，染色温度105~115℃，保温15~20min。

MethodsThe content was determined by solvent extraction and acid dye colorimetiy, with Acanthoine Ruscope-ine （C16H22N4O2） as a control criterion and bromocresol green as the acid dye, and the wavelength was at 418 nm.

方法采用溶剂萃取酸性染料比色法测定，以去氢飞廉碱（C16H22N4O2）为对照品，溴甲酚绿为酸性染料，用氯仿萃取，检测波长418 nm。

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。