丙酮的

In this work, a full optimal calculation on the molecular geometry and electronic structure of C24H30O8 has been performed using density functional theory methods at B3LYP/6-31G(superscript *) level. The solvent effects of C24H30O8 have also been investigated based on Onsager self-consistent reaction field model in chloroform, acetone, DMSO and water. On the basis of optimized geometry in gas phase the vibration analysis is carried out and the IR principle peaks scaled by 0.9613 are in good agreement with experimental.

采用密度泛函理论方法，在B3LYP/6-31G水平下全优化得到了该化合物的分子几何构型和电子结构；依据Onsager自恰反应场模型考察了其在氯仿、丙酮、二甲亚砜及水等溶剂中的溶剂化作用；基于气相优化结构进行了B3LYP/6-31G振动分析，用0.9613校正后的主要红外光谱与实验符合得很好。

In this work, a full optimal calculationon the molecular geometry and electronic structure of C24H30O8 has been performed usingdensity functional theory methods at B3LYP/6 - 31G * level. The solvent effects ofC24H30O8 have also been investigated based on Onsager self-consistent reaction field model in chloroform, acetone,DMSO and water.

采用密度泛函理论方法，在B3LLYP/6-31G*水平下全优化得到了该化合物的分子几何构型和电子结构；依据Onsager自恰反应场模型考察了其在氯仿、丙酮、二甲亚砜及水等溶剂中的溶剂化作用；基于气相优化结构进行了B3LYP/6-31G*振动分析，用0.9613校正后的主要红外光谱与实验符合得很好。

The higher the concentration, the bigger the physiological index. 3. The Ether extract, the n-BuOH extract, the acetone and the chloroform extract treatment after chilling stress and restored the growth, the content of protein, the content of chlorophyll, SOD、POD and CAT activities were higher compared the control, the content of MDA was lower compared the control.

经前胡乙醚、正丁醇、丙酮和三氯甲烷提取物质喷雾处理的幼苗在低温处理36小时后，可溶性蛋白质含量、SOD、POD、CAT活性均下降，在低温处理恢复生长后，SOD、POD、CAT、可溶性蛋白和总叶绿素含量均比低温对照幼苗高，MDA含量比低温对照幼苗低；在低温处理后及恢复生长后各生理指标随浓度的增加呈现出先升高后降低的趋势。

Phytochemical investigation on the acetone extract of the stems of K.oblongifolia led to the isolation of 49 compounds and 31 of them were identified.They were 20 lignans,(including 11 dibenzocyclooctadienes,8 spirobenzofuranoid dibenzocycloocta -dienes,1 other lignan),9 flavones,and 1 nortriterpenoid.Among them,4 were new compounds,1 was new natural products,and 8 compounds were isolated from this family for the first time.

通过对冷饭藤的藤茎化学成分的研究，从丙酮提取物中分离得到49个化合物，鉴定了31个化合物，包括木脂素类化合物20个(联苯环辛烯类木脂素11个，螺苯骈联苯环辛烯类木脂素8个，其他类型木脂素1个)，黄酮类化合物9个，降三萜类化合物1个，其中。4个为新化合物，1个新的天然产物，8个为本科首次报道。

Simultaneously, the activity and coding gene expression of ribulose 1, 5-bisphosphate carboxylase, phosphoenolpyruvate carboxylase, and glycollic oxidase all decrease in two rice accessions under low potassium supply while significant decrease in non-allelopathic rice "Lemont".

水稻光合作用相关酶的分析结果表明，低钾条件下核酮糖－1，5-二磷酸羧化酶、磷酸烯醇式丙酮酸羧化酶和乙醇酸氧化酶的活性及其基因表达强度均降低，但化感水稻&PI312777&的下降幅度显著小于非化感水稻&Lemont&。

According the known structure of MELs and the composition of broth, the separate and purify process of MELs was studied with silica-gel chromatography and the optimum conditions were: silica gel particle size 200 mesh, washing solution chloroform-acetone mixture (7: 3 for MEL-A, 6: 4 for MEL-B), washing rate 0.25ml/min, washing amount 400ml solvent/g MEL.

1根据已知生物表面活性剂MEL的结构特点和发酵液组成，在提取得到MEL粗制品的基础上，采用硅胶色谱分离技术，确定了MEL的最佳分离纯化条件：硅胶粒径200目，洗脱剂采用氯仿-丙酮混合溶剂，洗脱剂配比为7∶3、6∶4，洗脱速率为0.25ml/min，洗脱剂用量为400ml/gMEL。

On the other hand, the apoptotic effects of mtDNA depletion in vivo are different from those observed in cultured cells because of the supplementation of pyruvate and uridine in the medium.

另一方面，mtDNA的减除对活体细胞的影响与在细胞培养所观察到之凋亡行为应有所不同，因为在活体组织内细胞并无法获得大量的丙酮酸。

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。

The protein and the fatty compounds in the sample are precipitated by zinc acetate and potassium ferrocyanide, then the chromogenic reaction of acetylacetone with formaldehyde released from the sample in weak-acid medium and boiling bath takes place immediately.

提出了一种用於现场测定水发食品中甲醛含量的样品快速前处理新方法，采用乙酸锌和亚铁氰化钾沉淀样品中的蛋白质和脂肪，在弱酸性介质和沸水浴条件下提取了样品中的甲醛，并与乙酰丙酮立即发生显色反应。

The effects of some important factors on structure, pore size, porosity, flux, weight of vapor transfer, etc. have been investigated by changing temperature of PVDF resolution, types of solvent, molecular weight of PVDF, weight of additive, time of solvent pre-evaporation and so on. The optimal process of making membrane and recipe of solution were made out.

然后通过改变PVDF溶解温度，铸膜液的溶剂，PVDF的分子量，PVDF用量，添加剂氯化锂用量，涂膜时预挥发时间，凝固浴温度以及凝固浴中无机盐氯化钠、溶剂丙酮等影响因素，考察这些因素对膜形态结构及孔径，孔隙率，水通量，透湿量等性能的影响规律，初步确定了铸膜液配方及涂膜工艺条件。

And Pharaoh spoke to Joseph, saying, Your father and your brothers have come to you.

47：5 法老对约瑟说，你父亲和你弟兄们到你这里来了。

Additionally, the approximate flattening of surface strip using lines linking midpoints on perpendicular lines between geodesic curves and the unconditional extreme value method are discussed.

提出了用测地线方程、曲面上两点间短程线来计算膜结构曲面测地线的方法，同时，采用测地线间垂线的中点连线和用无约束极值法进行空间条状曲面近似展开的分析。