查询词典 acetone

A novel Belousov-Zhabotinskii type oscillating reaction was observed in a closed serine-BrO^-~3-Mn^2^+- H2SO4 system(Ser-BZ system), which exhibited the followign characteristics:(1)Although Ser is unable to be brominated, the sustained oscillations could still be observed in the above system under batchreactor conditions even in the absence of either acetone or inert gas flow.(2)The present oscillations displayed extremely short induction period(0) and very few oscillation number(1).(3)Cl^-, acrylonitrile, or Br^- could effectively inhibit the oscillations. However, in the case when enough Ag^+ was addedinto the system to completely inhibit the oscillations in , the oscillations on the Pt-electrode could still be observed.

首次报道了间歇釜中以丝氨酸-BrO^-~3-Mn^2^+-H2SO4为体系的新型BZ类振荡反应，其特征如下：(1)虽然Ser不能发生溴代反应，但即使在无丙酮或惰性气体流时也能在间歇釜中观察到持续振荡；(2)振荡诱导期极短(～0)，振荡次数较少(1次)；(3)振荡反应受到Cl^-，Br^-，丙烯腈等的抑制；但当加入足够量Ag^+使的振荡抑制后，仍可在Pt电极上观察到振荡现象。

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。

Using acetone as a photosensitizer,and N3· as an oxidant by pulse radiolysis method,the induced oxidation of cyclic-Phe-His in aqueous solution has been also reported in this paper,results similar to the photoionization of cyclic-Phe-His have been found.

而具有亲电子性的丙酮能在该环肽的苯丙氨酸残基的苯环上抽取电子，形成320nm和410nm的特征吸收峰，求出了自由基的有关动力学参数，并用脉冲辐解动态吸收光谱法印证了上述结果。

In the program, on theoretically we have studied the effects of configuration, the arranged periodic length and the refractive index ratio on PBG using finite difference time dormain method; on experimental, we have synthesized monodispersed silaca microspheres with size of 150-320 nm by colloidal chemical methods. And 3D perfect photonic crystals were prepared using the evaporating of acetone self-assembling the monodispersed SiO2 microspheres on quartzes by and horizontal and vertical deposition methods.

在本项目的研究中，理论上我们应用有限时阈差分法研究了光子晶体光子带隙形成与空间构型、排列的周期长度及折射率比之间的关系；实验上，我们应用胶体化学方法制备了150-320 nm的SiO2胶体微球，以丙酮为挥发溶剂，通过水平重力沉积法和垂直自然吸附法制备了各种粒度、排列完美的面心立方光子晶体。

A series of pyrroles were synthesized from primary amine(including fatty amine and aromatic amine)and acetonyl-acetone through a Paal-Knorr reaction catalyzed by formic acid at room temperature under solvent-free conditions.

以甲酸为催化剂，无需使用任何溶剂，在室温条件下，多种伯胺与2，5-己二酮发生Paal-Knorr缩合反应，生成相应的吡咯衍生物。

An improved method that facilitates the extraction of PCR-compatible faecal DNA from giant panda\'s faeces is described. The method involves a novel preprocessing step in DNA extraction. The faeces is washed two or three times with precooled acetone, which removes numerous potential PCR inhibitors, and then digested with proteinase K. The DNA is purified with phenol/chloroform.

在粪便DNA的提取过程中采用一个新的预处理方法，将粪便用预冷的丙酮洗2～3次，除去粪便中含有的大量PCR抑制物，然后蛋白酶K裂解、酚-氯仿抽提，能提取到纯度很高的DNA供PCR扩增。

The phosphines such as 〓, dppm bis(diphenylphosphinemethane, dppebis(diphenylphineethane and dppp bis(diphenylphosphinrpropaneare chosen for study. The chloro alkane, bromide alkane and acetone arechosen as solvents.

选择有机单膦〓和双膦配体dppm二(二苯基膦甲烷、dppe二(二苯基膦乙烷、dppp二(二苯基膦乙烷与〓反应，选择氯代烷、溴代烷和丙酮为反应溶剂。

Some technologies,including olefines from methanol,oxalates and ethylene glycol from carbon monoxide,carbon dioxide-based polymers,chemicals from the syngas prepared by biomass gasification,acetone and butanol by fermentation,and chemicals from acetylene,ethanol,glycerol,furfural,hydroxymethyl furfural and starch,were reviewed.

包括甲醇制烯烃，一氧化碳制草酸酯和乙二醇，乙炔化学品，二氧化碳聚合物，生物质气化合成化工产品，发酵法生产丙酮、丁醇，乙醇衍生化工产品，甘油合成化工产品，糠醛和羟甲基糠醛合成化工产品，淀粉合成化工产品等重要的石油替代化学品生产技术被介绍。

It is easy to absorb the moisture, and can be soluble by absorbing the water in the air. The water-free Zinc Chlorideis easily soluble in water. It is soluble in ethanol ,acetone and

易吸潮，能自空气中吸收水分而溶化，氯化锌水合物有1、2、3、4个结晶水，无水氯化锌极易溶于水中，能溶于乙醇、丙酮和丙三醇中，具有腐蚀性，并具有使纤维素润胀的性质，有毒性，灼热时，有浓厚白烟生成。

Wax was produced by two-stage vacuum filtration of acetone-benzol dewaxing unit with the fraction of the second side-cut vacuum distillation as material.

以减压蒸馏二线抽出物为原料，在重油酮苯脱蜡装置的两段过滤工艺中，采取更换冷洗喷头，封堵过滤机底部抽真空过滤面积，调整一段、二段过滤机进料温度分别为-10℃，0℃等措施，进行了58℃石蜡的工业化生产。

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。