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Finally, pentyl acetate and benteine could be respectively synthesized by esterification reaction in the presence of nanometer rare earth composite solid superacids (SO_4)~(2-)/ZrO_2-Gd_2O_3 and (SO_4)~(2-)/ZrO_2-Nd_2O_3. The effects of reaction time, reaction temperature, the mol ratio of acid to alcohol and the use level of catalyst on esterification yield were discussed. In the end, we obtained their optimal reaction conditions.

采用纳米稀土复合固体超强酸SO_4~(2-)/ZrO_2-Gd_2O_3，SO_4~(2-)，~/ZrO_2-Nd_2O_3分别合成了乙酸戊酯和乙酸苄酯两种香料，实验考察了反应时间、反应温度、醇酸比及催化剂的用量对酯化率的影响，并由此得出反应的最佳条件。

Faba root tip was studied through detection of micronucleus technique Both of nitrate (0.08 mol/L) and nitrite (0.80 mmol/L) with low concn of could significantly induce the formation of micronucleus of V. faba root tip (P.01), and showed an obvious dose effect, i.e. the permillage of micronucleus was in linear increase with rising up of mutagen concn within a certain range.

结果］低浓度的硝酸盐(0.08mol/L)、亚硝酸盐(0.80mmol/L)均能显著诱发蚕豆根尖微核的形成(P.01)，并呈现出明显的剂量效应，即微核千分率在一定范围内随诱变剂浓度的增加而线性增加。

4 Add 6 to 8 drops of the phenolphthalein indicator solution to the bottles and titrate to a pink end point with 0.5 N NaOH solution.

10.1.4 在瓶子里加入6到8滴的酚酞指示剂溶液来作为滴定0.5 mol/l 的NaOH 溶液的指示剂，直到溶液变成粉红色

When leaves and intact chloroplasts were treated by MA at a concentration of 20 μmol/L, the rate of phot...

对在C3植物中建立C4微循环系统来提高光合作用效率的可能性进行了讨论。

In the acidic solution, better photodecomposition efficiency is achieved than in the neutral or alkaline solution. The experiments demonstrated that the optimum doping of La at 10 mol%, the maximum photodecomposition in dye concertration at 15 mg/L and photocatalytic dosage at 0.75 g/L, achieving the highest effect.

於本研究中，改质式光触媒於酸性条件下有最佳光活性；在固定触媒总量下，以LT10（镧钛莫耳比0.1）之触媒有最佳的光催化效果；而在初始浓度，以单位克重TiO2负荷去除量而言，以15 mg/L有著最佳的处理效果；添加量为0.75 g/L可有效利用触媒，以达到经济效应。

Mol·L~(-1) individually and also with both heavy metals present. Plasmolysis, concentrated cytoplasm, disappear ance of the cristae of mitochondria, ambiguity of framework and destruction of mitochondria envelope were all symptoms of root cells under Cu stress; hollowing cells was also found in Cd treatment, and there existed some different granule in these hollowing cells.

铜使根细胞产生质壁分离、细胞质浓缩、部分细胞空泡化，使线粒体脊突消失、结构模糊、外膜破坏；镉使根细胞空泡化，并在部分空泡化的细胞里产生大小不等的颗粒状物；铜、镉交互污染使根细胞受害程度加深，并兼有两者的受害症状特征：线粒体结构彻底破坏、空泡化细胞里的颗粒物更大电子密度更高、质壁分离现象更普遍、质膜上的颗粒物沉淀更大。

In 0.40 mol/L HAcNaAc(pH=5.00) buffer solution, a highly sensitive complex catalytic hydrogen wave of Rh5NO2PADAT was obtained by using singlesweep polarograph.

但在极谱分析中应用未见报道。本文研究发现，在HAc-NaAc缓冲溶液中，铑与5-NO2-PADAT形成的配合物于-1.20Vvs。

In the system of potash feldspar with desulfurization ash ,when addition of sodium sulphate was 3%,the digest.

当硫酸钠添加量为4.76%时，反应温度可降至1050℃，表观活化能可降至81.97 kJ/mol；对于添加脱硫灰渣的钾长石体系，当硫酸钠添加量为3%时能显著提高钾溶出率，此时钾溶出率为71%～74%。

Based on the facts, the surface coverage and diffusion coefficient of potass ion in lanthanum hexacyanoferrate was estimated.

根据法拉第定律计算，普鲁士蓝纳米粒子在金电极表面的粒子数为4.54×10〓cm〓(相当于1.00×10〓mol/cm〓)。

All current users of Mol SmartMap can purchas e our new GPS navigation title SmartNavigator w praxiology a 50% discount.

摩尔SmartMap的所有当前用户的位置，我们可以珀切斯新的GPS导航标题SmartNavigator瓦特行为学50％的折扣。

Shop assistant: Please check at the door.

店员：请您到门口柜台交费。

In the end, transportation of PAHs in the environmental matrix was preliminarily investigated and discussed according to PAHs data of soils and sediments from a certain region in Shanghai. The result indicated that there are two or more pathways on PAHs transportation in the environmental matrix.

最后，对上海特定地区内PAHs在环境介质中的迁移径途进行了分析讨论，结果表明上海市土壤和沉积物等环境介质中PAHs的迁移存在多种途径。