丙酮的

While the adsorptions of 1-propanol and 1-Br-propane at 100℃ give rise to 1-propoxy species, which mainly converted to propanal at higher temperature. IR spectrum arising from the interaction of propene with the catalyst at 100 ℃ shows the IR bands of allyl alcoholate and isopropoxy species. As the temperature was increased to 150℃, the bands ascribable to the adsorbed acetone and acrolein were observed. Based on these results, it is suggested that isopropoxy species is one of the intermediates for SOP to acrolein over MoPO/SiO〓 catalyst.

2原位IR光谱实验结果表明：200℃时丙烷/O〓混合气在催化剂表面吸附后的IR谱与同温度下异丙醇吸附的IR谱相似，均检测到吸附态丙酮物种和丙烯醛物种的IR谱峰；溴代异丙烷和异丙醇在催化剂表面吸附后均转化为异丙氧基，异丙氧基主要转化为丙烯和丙酮，丙烯进一步转化为丙烯醛；溴代正丙烷和正丙醇在催化剂表面吸附后均转化为正丙氧基，正丙氧基主要转化为丙醛；丙烯在催化剂表面吸附后转化为σ-氧烯丙基和异丙氧基，升温后σ-氧烯丙基转化为丙烯醛而异丙氧基转化为丙酮。

While the adsorptions of l-propanol and 1-Br-propane at 100 癈 give rise to 1-propoxy species, which mainly converted to propanal at higher temperature. IR spectrum arising from the interaction of propene with the catalyst at 100 癈 shows the IR bands of allyl alcoholate and isopropoxy species. As the temperature was increased to 150 癈, the bands ascribable to the adsorbed acetone and acrolein were observed. Based on these results, it is suggested that isopropoxy species is one of the intermediates for SOP to acrolein over MoPO/SiO2 catalyst.

原位IR光谱实验结果表明：200℃时丙烷／O_2混合气在催化剂表面吸附后的IR谱与同温度下异丙醇吸附的IR谱相似，均检测到吸附态丙酮物种和丙烯醛物种的IR谱峰；溴代异丙烷和异丙醇在催化剂表面吸附后均转化为异丙氧基，异丙氧基主要转化为丙烯和丙酮，丙烯进一步转化为丙烯醛；溴代正丙烷和正丙醇在催化剂表面吸附后均转化为正丙氧基，正丙氧基主要转化为丙醛；丙烯在催化剂表面吸附后转化为σ-氧烯丙基和异丙氧基，升温后σ-氧烯丙基转化为丙烯醛而异丙氧基转化为丙酮。

The spinning solution is made by dissolving cellulose acetate in acetone containing a small amount of water (up to 10 percent).

将醋酯纤维素溶解于丙酮中(丙酮中含有少量的水，最大含水量为丙酮重量的10%)而形成纺丝液。

Acetone has been in common use as a solvent and as an extracting regent, in industry for several decades. It is easy to evaporate in air. When the concentration of acetone in air is higher than 10,000 ppm, people may experience such symptoms as cephalalgia, nausea and so on.

由於丙酮是工业上广泛应用的溶剂，它极易挥发，且当人体曝露在高浓度的丙酮下，会有头痛、困倦及呕吐等症状，所以丙酮感测器可应用於工业的环境检测。

This article describes the new process of methyl methacrylate which uses methanol,carbon monoxide and acetone as raw materials,via acetone cyanohydrin route;makes the simple economic comparison between the concept design of Chem.

描述了日本三菱瓦斯化学公司以甲醇、一氧化碳和丙酮为起始原料，经丙酮氰醇制取甲基丙烯酸甲酯的新工艺以及化学系统公司的概念设计流程与传统丙酮氰醇工艺的简单经济比较。

The paper carries on qualitative analysis to the acetone extractives before and after discoloring, shows the main components of the extractives and then takes comparison. The results shows :①The hydroxyl is oxidized and then shifted to the carbonyl,carboxyl, ester and ketone groups during inducing discoloration under the pretreatment conditions,which makes the wood color deep;② There are plenty of auxochromic groups in the acetone extractives of silver chain, the interaction between the auxochromic groups and the chromophoric groups makes the wood color deep.

摘 要：本文通过对刺槐变色前后丙酮抽出物的定性分析，得出变色前后丙酮抽出物的主要成分，进行对比分析，初步得出抽出物对诱发变色的作用为：①变色前后羟基在预处理条件下氧化成羰基，羧基，酯基和酮基等官能团，使木材颜色加深；②刺槐丙酮抽出物的主要成分中含有大量助色基，这些基团会与木素中的发色基团相互作用，使木材颜色加深。

Cationic resin was chosen to decolour the fermentation broth besides to play the role of cation exchange.

1选用732型阳离子树脂为丙酮酸发酵液的脱色剂和阳离子交换剂，把脱色和改性两道工序合并，简化了提取丙酮酸的环节，从而提高了丙酮酸的提取收率。

After supplement pyruvate, the serum TG in athletes was significantly higher than that of the control athletes and students (p.05), so was the serum FFA in students than that of the control athletes (p.05). Compared with before pyruvate supplement, the serum HDL-C of athletes increases dramatically (p.05) and serum GLU levels in all subjects reduce remarkably (p.05). It showed that pyruvate supplement could be have stated effect on glycometobolism and lipometabolism of male Shanshou athletes.

补充丙酮酸后，男子散手运动员血清TG水平明显低于对照组(tc组和sc组，p.05)，大学生血清FFA水平明显高于对照组运动员p.05与补充丙酮酸前相比，运动员血清HDL-C水平明显增高(p.05，而所有研究对象的血糖均明显下降(p.05)，这表明丙酮酸补充可能对运动员和大学生的血脂代谢和糖代谢均有一定的影响；4。

Pyruvate dehydrogenase kinases (PDKs 1-4) can regulate the activity of mitochondrial pyruvate dehydrogenase complex to catalyse the oxidative decarboxylation of pyruvate, and then to link glycolysis to the tricarboxylic acid cycle and ATP production.

丙酮酸脱氢酶激酶具有能够调节线粒体丙酮酸脱氢酶复合体催化丙酮酸脱羧氧化的活性，并进一步将糖酵解与三羧酸循环以及ATP的生成联系在一起。

Experiments show that:when the concentration of acetone is decreased from 100% to 20%,the absorbance bands at 3538cm-1 and 3441cm-1 of CH3 is redshifted,the absorbance band at 1713cm-1 and 1647cm-1 of CO is redshifted about 19 cm-1 and 21cm-1 respectively.

发现随着丙酮水溶液浓度的减小，丙酮CH3键的对称(3538cm-1)和不对称伸缩振动(3441cm-1)吸收峰位置波数减小方向迁徙，CO伸缩振动吸收(1713cm-1)向波数减小方向移动，丙酮浓度为20％时，迁徒至1691cm-1，减小了约19cm-1；同时1647cm-1处的吸收则迁徙至1626cm-1。

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。