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甲醛

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The results show that this reaction proceeds in two step: 1 silylene and formaldehyde form an intermediate complex, which is a kind of exothermal reaction with no barrier; 2 the intermediate complex isomerizes to sive the product. The barrier for the second step is 51.4kJ·mol^-^1 at MP2/6-31G^*//6-31G^* level (with zero-point energies correction). In view of dynamics and thermodynamics, it is between 300~400K that the reaction will have not only larger spontaneous tendency and equilibrium constant but also quicker reaction rate.

结果表明,此反应历程由两步组成:1硅烯与甲醛生成一中间配合物,是一无势垒的放热反应,2中间配合物异构化为产物,此步势垒经零点能校正后只有51.4kJ·mol^-^1(MP2/6-31G^*//6-31G^*);从热力学和动力学的综合角度考虑,该反应在300~400K温度下进行为宜,如此,反应既有较大的自发趋势和平衡常数,又具有较快的反应速率。

Result The length and width of two varieties of Vicia faba stomata were reduced with the increase of formaldehyde concentrations.

结果]2种蚕豆幼苗叶片气孔的长度和宽度均随甲醛浓度的增加和处理时间的延长而变小。

Airtight reaction chamber method was used to investigate the effects of formaldehyde pollution on Vicia faba stomata reaction.

方法]采用密闭反应仓法研究蚕豆叶片气孔对不同浓度甲醛污染处理的响应。

Common Vicia faba stomata was more sensitive to formaldehyde than that of Songzi green Vicia faba.

结论]普通蚕豆叶片气孔对甲醛污染的反应比松滋青皮蚕豆叶片气孔的反应更敏感。

Objective To study the influence of formaldehyde sulphoxylate on the expression of glial fibrillar acidic protein in mice hippocampus.

目的研究次硫酸氢钠甲醛对小鼠海马神经胶质酸性蛋白表达的影响。

Objective To study the influence of formaldehyde sulphoxylate on the expression of glial fibrillar acidic protein in mice hippocampus.

目的 研究次硫酸氢钠甲醛对小鼠海马神经胶质酸性蛋白表达的影响。

The determination method of trace manganese content in the water was investigated by formaldoxime spectrophotometry.

提出应用甲醛肟分光光度法测定原水中微量金属锰含量的方法,并对可能的干扰进行了讨论,对方法的精密度和准确度进行实验。

Key wordy: Longjiang River; Fe; Mn; Heavy–metal pollution; Countermeasures and Suggestion; Spectrophotometry; Formaldoxime; O-phenanthroline

龙江; Fe; Mn ;重金属污染;对策与建议;分光光度法;甲醛肟;邻菲啰

In addition, the methanol contained in aspartame breaks down into formic acid and formaldehyde.

此外,甲醇所载阿斯巴甜破裂成甲酸和甲醛

Molecular sieve and solid acid of SO~(2-)_4/ZrO_2, ionic liquids, and rare earth perfluoro alkyl sulfosalts to formylate alkylbenzene by carbon monoxide to synthesize alkylbenzaldehyde was introduced.

介绍HCl-AlCl3、HF-BF3和CF3SO3H-SbF5等B-L复合酸,分子筛和固体酸,离子液体以及稀土全氟烷基磺酸盐作催化剂在烷基苯用CO甲酰化合成相应烷基苯甲醛工艺中的应用进展。

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They weren't aggressive, but I yelled and threw a rock in their direction to get them off the trail and away from me, just in case.

他们没有侵略性,但我大喊,并在他们的方向扔石头让他们过的线索,远离我,以防万一。

In slot 2 in your bag put wrapping paper, quantity does not matter in this case.

在你的书包里槽2把包装纸、数量无关紧要。

Store this product in a sealed, lightproof, dry and cool place.

密封,遮光,置阴凉干燥处。