二酸

Based on the bioisosterism of malonate group with phosphate group, a series of barbiturate compounds and pyrazolidine-3, 5-dione compounds were designed and synthesized.

基于丙二酸是磷酸的生物电子等排体，我们设计了丙二酸的闭环结构的巴比妥酸及3，5-吡唑烷二酮类化合物。

The synthesis methods of dibutyl succinate catalyzed by p-toluene sulfonic acid, amino sulfonic acid,strongly acidic cationic exchange resin, ferric chloride hexahydrate, stannic chloride pentahydrate, copper sulfate , ammonium ferric sulfate dodecahydrate, titanium sulfate, sodium bisulfate monohydrate,and solid super acid et al were reviewed.

本文评述了对甲苯磺酸、氨基磺酸、强酸性阳离子交换树脂、六水三氯化铁、五水四氯化锡、十二水合硫酸铁铵、硫酸钛、一水硫酸氢钠和固体超强酸等催化剂催化合成丁二酸二丁酯的方法。

The synthesis path of 2-phosphono-butane-1,2,4-tricarboxylic acid is studied by using alkyl phosphate,butendioic acid dialklesters and methyl acrylate with the catalyst of sodium methylate.

论文摘要本文以亚磷酸二甲酯，顺丁烯二酸二甲酯，丙烯酸甲酯为原料，甲醇钠为催化剂，合成了 2-膦酸丁烷-1，2，4-三羧酸并对中间物及产物进行了 IR、13C，31P 核磁，MS 表征。

But the two-component nucleator,pimelic acid/calcium carbonate exhibited good thermal stability,which infer that there are some interactions between pimelic acid and calcium carbonate.

这可能是由于庚二酸与碳酸钙之间存在某种相互作用，从而使成核效果得以稳定，而辛二酸、壬二酸与碳酸钙组成的双组分成核剂中，两个组分基本独立存在。

Given the known reaction mechanism and general chemical considerations, we propose that nicotine, when used as the carbon source by P. putida J5, is catabolized to pyruvic acid via pyrrolidine pathway and then participates in the synthesis of vitamin pantothenate and CoA, which supply the energy for the normal functioning.

通过对突变位点基因的功能分析推测，假单胞杆菌可以将尼古丁代谢为2，5-二羟基吡啶，而2，5-二羟基吡啶可以进一步转化为丁烯二酸和丙酮酸，进而参与了泛酸和 CoA 的合成，为生理代谢提供基质。

The assemblies of the C60 mixed film and the behenic acid film were made successfully by means of Langmuir-Blodgett technique with BA, arachic acid, stearic acid and octadecanyl amine as the assistant material, and the reorganization of the LB films was directly observed by liquid atomic force microscopy.

利用Langmuir-Blodgett方法，以二十二酸(behenic acid， BA)、二十酸(arachic acid， AA)、十八酸(stearic acid， SA)和十八胺(octadecanyl amine， OA)作为辅助成膜材料，组装了C60复合膜和BA膜，液下原子力显微镜直接对LB膜在水相中的重组进行观察。

Azelaic acid is a natural saturated binary carboxylic acid, which has good inhibitory and killing activities to various aerobic and anaerobic micro-organisms presents on the skin suffered acne.

壬二酸是一种天然的饱和二羧酸，壬二酸对存在于粉刺皮肤上的各种需氧和厌氧微生物均有良好的抑菌、杀菌活性。

Mutation of the AZELAIC ACID INDUCED 1 (AZI1) gene, which is induced by azelaic acid, results in the specific loss of systemic immunity triggered by pathogen or azelaic acid and of the priming of SA induction in plants.

可感应壬二酸的壬二酸感应基因(AZI1)的突变，导致了由病原体或植物体中的壬二酸和SA感应起始所触发的特定性丢失。

The results showed that in acetone and ethanol, solubilities of 3, 28-di-O-glutaryl-betulin were 33.52 and 22.65 times of those of betulin respectively; In water, solubility of 3, 28-di-O-glutaryl-betulin was 0.0021 g (100 mL water), and in PBS, solubility of 3, 28-di-O-glutary-betulin was 0.0015 g (100 mL PBS), the hydrophilicity of 3, 28-di-O-glutaryl-betulin was significantly increase.

结果表明，在丙酮和无水乙醇中，桦木酐戊二酸酯的溶解度是桦木醇的33.52和22.65倍；在水中，桦木醇戊二酸酯的溶解度为0.0021g（100mL水）；在PBS中，桦木醇戊二酸酯的溶解度约为0.0015g(100mL PBS)，目标产物的亲水性有了显著的改善。

The reaction of [60] fullerene with dimethyl malonate and diethyl malonate in the presence of manganese acetate dihydrate for 20 min afforded singly bonded [60] fullerene dimers in a 1, 4-addition pattern.

Mn作为一类良好的自由基引发剂，能有效地催化C〓与丙二酸二甲酯和丙二酸二乙酯的自由基加成反应，生成C〓的二聚体。在回流的氯苯中随着时间的的延长，二聚体分解成1，4-双加成的C〓衍生物。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。