二酸

With propanal and malonate as reaction agents and piperidine as the catalyst, Knoevenagel reaction was used in the synthesis of flavor 2-pentenoic acid.

以丙醛和丙二酸为原料，哌啶为催化剂，采用Knoevenagel反应合成了食用香料2-戊烯酸反式构型，产率64.2%，其具有干酪味、淡烤香味。

People with beriberi, a disease caused by thiamin deficiency , have elevated levels of blood pyruvate and a-ketoglutarate, especially after consuming a meal rich in glucose.

脚气病是一种维生素缺乏症，脚气病人的血液中有高水平的丙酮酸和α-酮戊二酸，尤其是在进食了一顿富含葡萄糖的食物之后。

Corn starch was treated by cross - linking using mixed acid of adipic acid and acetate .

采用已二酸和醋酸酯的混合酸交联处理玉米淀粉，然后对交联淀粉水浴加热至80℃制备非晶颗粒态淀粉。

Three powders were used: adipic acid, microcrystalline cellulose, and glycine.

3粉使用：己二酸、微晶纤维素、甘氨酸。

In the second part, the first example of Lewis acid catalyzed 1, 3-cycloaddition between nitrones and alkylidene malonates was developed by using trisoxazoline 63 and Co〓.

催化剂的用量可降至1-2mol％。在论文的第二部分，我们首次研究了Lewis酸催化的硝酮与丙二酸酯类衍生物的1，3-偶极加成反应。

2 Condensation of ketones with ethyl cyanoacetate catalysed by ammonium acetate-acetic acid results ethyl alkylidene cL-cyanoacetate in 3 l?.-89% yield under ultrasound irradiation at 4l-450C within

在超声波作用下，以芳香醛和丙二酸为原料，以膨胀石墨作催化剂，合成多种肉桂酸，于41～43℃反应3.5-10小时，产率65-97％。

Topical tretinoin,hydroquinone,Azelaic Acid,and kojic acid and various types of epidermal peels have been employed with variable degrees of success.

外用维甲酸、氢醌、壬二酸，曲酸和化学剥脱术已经获得了一定程度的成功。

The synthesis of high purity azelaic acid through oxidation of oleic acid with 50% hydrogen peroxide was studied by using tungstic acid as a catalyst and ionic liquid as a basic reaction system .

以油酸为原料，50%的H2O2为氧化剂，在离子液体作为主要溶剂的条件下，采用钨酸为催化剂所得中间产物用自制的过氧乙酸继续氧化裂解合成了高纯度壬二酸。

The results showed in the seven food preservative s,that calcium propionate had no effect on the growth of Peronophythoral litchii,while cinnamyl glyceroyl fumarate was the best.

结果表明：在所用的7种食品防腐剂中，丙酸钙对荔枝霜疫霉菌的生长无抑制作用，反丁烯二酸桂醇甘醇酯的抑菌效果最好

A novel one-step green process for synthesis of glutaric acid by selective oxidation of cyclopentene was investigated.

研究了以环戊烯为原料、草酸为有机络合剂、H2O2为氧化剂，在催化剂钨酸(H2WO4)的作用下一步合成戊二酸的绿色新过程，考察了氧化剂的含量、反应物配比、催化剂用量、反应温度、反应时间等对反应的影响。

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。