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The results show this tetragonal system oxide is spherical with the mean grain size of 25nm and its dispersity is good. The study of sensor's gas sensing characteristic shows SnO2 has higher sensitivity (805) to 50×10^(-6) Cl2 at 300℃ when the precursor has been treated at 550℃.

另外，在最佳工作温度300℃时，采用静态配气法测试了材料的气敏性能，发现SnO2对体积分数为5×10^(-5)的氯气的灵敏度高达805，而且对其它气体有很好的抗干扰能力。

As the precursor of sphingolipids, sphingosine is one of important constituents of cell membranes.

鞘氨醇是生物体内合成鞘脂的母体化合物，是生物膜中的重要组分之一。

Among the many naturalists, artists, and poets of the order may be mentioned: Thomas of Celano (d. about 1255), author of the "Dies Irae"; Giacomino of Verona (c. 1300), a precursor of Dante; St. Bonaventure (d 1274); Jacopone of Todi (d. 1306), author of the "Stabat Mater"; John Brugman (d. 1473); Gregor Martic (d. 1905); the Croatian poet.

在许多大自然，艺术家和诗人的命令可提及：托马斯切拉诺（草约1255年），作者的"模具Irae "； Giacomino维罗纳（角1300 ），前体的但丁；街文德（四1274 ）； Jacopone的陶迪（草1306年），作者的"圣母材料"；约翰布鲁格曼（草1473 ）；格雷戈尔马尔蒂奇（草1905年）；克罗地亚诗人。

Spherical bismuth stannate particles with single pyrochiore structure were obtained when the precursor was calcined at a temperature as low as 500℃.

该前驱体在500℃下锻烧即可形成具有烧绿石结构的四方晶相的Bi2Sn2O7纳米粉体，其平均晶粒尺寸为10nm，粒径分布在10~20nm之间，外观呈球形。

The effects of precursor solution on the stoichiometry of CuInS2 films were investigated.

分析了混合前驱体溶液中阳离子浓度比/对薄膜化学计量及性能的影响。

First, dissolving inorganic salts, strontium nitrate, bismuth nitrate and fluorine tantalum acid were chosen to substitute for the traditional metal organic salts as precursor to prepare SrBi〓Ta〓O〓 thin films.

本文首先选用可溶性无机盐原料替代传统的金属有机物盐类作SrBi〓Ta〓0〓薄膜的前驱体。

Therefore, the metabolic pathway from soybean oil to erythromycin was presumed as follows: soybean oil is metabolized into TCA pathway to generate much α ketoglutaric acid and then generate succinyl CoA by strengthening TCA pathway, and the methylmalonyl CoA is formed from succinyl CoA by isomerization. Finally, methylmalonyl CoA can be used as the precursor for the biosynthesis of erythromycin.

推测豆油经过红色糖多孢菌代谢后进入红霉素合成的一条可能途径：豆油经过代谢后进入TCA循环，并强化了TCA循环的通量，产生了大量α酮戊二酸，再生成琥珀酰CoA，琥珀酰CoA在甲基丙二酰CoA异构酶的作用下生成甲基丙二酰CoA作为红霉素合成的前体。

CoA by strengthening TCA pathway, and the methylmalonyl??CoA is formed from succinyl??CoA by isomerization. Finally, methylmalonyl??CoA can be used as the precursor for the biosynthesis of erythromycin.

餐？戊二酸，再生成琥珀酰CoA，琥珀酰CoA在甲基丙二酰CoA异构酶的作用下生成甲基丙二酰CoA作为红霉素合成的前体。

In order to identified phase Ⅱ conjugates, the aglycones were identifiedafter rat bile was treated with either glucuronidase or sulfatase firstly. Phase Ⅱ conjugates were also separated anddetermined for their molecular ions by LC-MS, at last they were verified by identifying characteristic product ionsor precursor ions by MS-MS.

胆汁经过葡萄糖醛酸酶或硫酸酯酶水解，鉴定其水解产物，从而确定Ⅱ相结合物，再通过LC-MS分离和确定分子离子峰，最后利用MS-MS寻找特征子离子和母离子的方法进行验证。

Thus, the corresponding chiral sulfonium ylide was designed and its precursor was found to be readily available from the coresponing sulfide that was easily prepared from D-camphor in two steps.

从价廉易得的手性源 D-樟脑出发，合成了硫原子 b -位含有羟基的手性硅基烯丙基硫盐。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。