乙酰丙

The paper studied the effect of 5-aminolevulinic acid on chlorophyll a, photosynthetic rate and chlorophyll fluorescence dynamics of Anthurium andraeanum.

探讨叶面喷施5-氨基乙酰丙酸对红掌光合作用及叶绿素荧光参数的影响，为花卉植物上合理施用ALA奠定基础。

Glucose, formic acid and levulinic acid were not detected in the liquors of acid hydrolysis and the concentration of xylose and arabinose was high, while the acetic acid was low. The mixture of monosaccharides and fatty acid was efficiently separated and the whole process of separation was finished within 23 minutes.

通过对样品的分析表明，麦糟水解液中不含有葡萄糖、甲酸及乙酰丙酸，木糖和阿拉伯糖的质量浓度比较高，乙酸的质量浓度比较低，单糖及脂肪酸的混合液得到很好的分离，分离过程在23min内完成。

The decarboxylation of 5-hydroxymethylfurfural to levulinic acid is a key step in the preparation of levulinic acid from biomass.

5-羟甲基糠醛脱羧生成乙酰丙酸是生物质资源出发制备乙酰丙酸过程中的关键步骤之一。

The results showed that there were 8 kinds of aliphatic, 5 kinds of esters, 2 kinds of aldehydes, 2 kinds of nitrogen sulfur heterocyclic rings and one kind of hydrocarbon, alcoholics, ketone, lactones respectively in the analyzed 21 kinds of aroma components, and the content of furfural,β-methyl valeric acid, palmitic acid, nicotine, neohytadiene were higher, next were acetyl ethyl propionate, caleric acid, phenyl ethyl acetate, hydroxylic diethyl succinate.

结果表明，在分析出的21种香气成分中，分别有脂肪酸类8种，酯类5种，醛类2种，氮硫杂环类2种，烃类、醇类、酮类、内酯类各l种，其中相对含量较高的物质成分是糠醛、β-甲基戊酸、十六碳酸、烟碱、新植二烯，其次是乙酰丙酸乙酯、异戊酸、苯乙酸乙酯、羟基丁二酸二乙酯等。

The condensation reaction of levulinates with ethylene glycol brings about corresponding ketal , with respective productivity of 74%, 75% and 75%, and respective structure being verified by IRS.

由乙酰丙酸酯类化合物与乙二醇进行缩合反应，得到相应的环状缩酮化合物，产率分别为 74 %，75 %和 75 ，其结构为红外光谱所证

The results showed that levulinic acid was stable in near-critical water.

实验结果表明：近临界水中乙酰丙酸较稳定，在280℃、反应32h下，乙酰丙酸的转化率仅为7.0％。

A mechanism model to describe the degradation of wheat straw to produce levulinic acid was suggested based on the analysis of experimental data obtained in this work and others from both domestic and international laboratories.

通过对小麦秸秆降解生产乙酰丙酸实验数据的分析并参考国内外类似的研究结果，提出了生物质水解生成乙酰丙酸的水解机理模型。

The progress on chemical synthesis and biosynthesis of levulinic acid and 5-aminolevulinic acid(5-ALA) were discussed.

基于生物质资源的利用和开发，论述了乙酰丙酸的制取、5-氨基乙酰丙酸的化学合成与生物合成，阐述了其在医药、农业等方面的应用，讨论了发展趋势和亟待解决的问题。

The traditional separation and purification process of levulinic acid was consisted of solvent extraction and high vaccumn distillation, which was low in product recovery, high in energy consumption and complex in process operation.

传统的乙酰丙酸分离提取工艺以有机溶剂萃取和真空精馏为核心，乙酰丙酸的回收率低、能耗高、工艺复杂，成了制约工业化生产的主要因素。

The exchange and adsorption properties of LA, FA and glu on six anion exchange resins were investigated, and the influence of the temperature was also researched, among them weakly basic ion-exchange resin 335 can provide the highest uptake capacity of LA The Freundlich equation can explain the adsorption equilibrium curves of LA on the anion resins better than the Langmuir equation.

在静态吸附性能研究部分，研究了乙酰丙酸、葡萄糖和甲酸在六种阴离子树脂上的静态吸附行为，筛选出吸附性能最好的335树脂，Freundlich方程比 Langmuir方程能更好的描述树脂对乙酰丙酸和甲酸的吸附。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。