二酸

Then the catalysts of high activities were selected to be used in the preparation of mixed dibasic acid dimethyl esters.Mixed dibasic acids are byproducts of hexanedioic acid. In this article DBE were synthesized.

己二酸生产过程中副产大量的混合二元酸，本文选用DBA和甲醇为原料，分别采用磷钨杂多酸、PW_(12)/C和PW_(12)/SiO_2为催化剂，合成了绿色环保高沸DBE。

In this experiment we use the alcohol to replace the Fumaric acid and using the NaOH and HCl to control the pH number.

而本实验就是以过锰酸钾加入酒精以代替过去使用的反丁烯二酸并以HCl及NaOH来调控其酸碱值并比较其反应后的各种性质。

These include succinic acid and glutaric acids.

琥珀酸和丁二酸是属于这类酸。

Compared to the control animals, the rats treated with AC showed increased levels of citrate, 2-oxoglutarate and cis -aconitate, and decreased levels of hippurate and phenylacetylglycine in the urine. Such metabolic changes may have reflected, respectively, the changes in body energy metabolism and in the metabolism of intestinal flora in response to AC treatment.

结果表明灌胃给药后代表能量代谢的柠檬酸，2-酮戊二酸（2-oxoglutarate）和顺乌火酸（ cis -aconitate），反应肠道菌群代谢状况的马尿酸盐和苯乙尿酸出现异常，并且这些变化在给药后0~8 h达到最大，16 h后基本恢复正常。

And while at pH=4-8, the dosage of combined collector reached 500g/t and the ratio of benzyl malonic acid and hydroximic acid is 2︰8, the flotation recovery of hematite reached its maximum of 95.6%.

当组合药剂用量为500g/t、矿浆pH值为4~8、苄基丙二酸︰C5-9羟肟酸=2︰8时，赤铁矿回收率达到最大值，为95.6%。

When the dosage of combined collector is 1000g/t and the ratio of benzyl malonic acid and hydroximic acid is 4︰6, on the condition of pH=7-9, the maximal flotation recovery of calamine was gained which was 75.6%.

当苄基丙二酸︰苯甲羟肟酸=4︰6、矿浆pH值为7~9、组合药剂用量为1000g/t时，菱锌矿回收率达到最大值，为75.6%。

If 0.01 M sodium malonate is added to actively respiring mitochondria that are using pyruvate as fuel source, respiration soon stops and a metabolic intermediate accumulates.

如果0.01M丙二酸钠加入到以丙酮酸为能源并正在进行活跃呼吸作用的线粒体中，呼吸作用很快停止，代谢中间产物累积下来。

Cinnamic acid was synthesized from benzaldehyde and malonic acid by Knoevenagel reaction with pyridine as catalyst.

以苯甲醛和丙二酸为原料，吡啶为催化剂，利用 Knoevenagel 反应合成肉桂酸，从而降低了反应温度，提高了收率和产物纯度，简化了合成工艺。

-3-Alkenoic acids were synthesized by Knoevenagel reactions of aliphatic aldehyde s with malonic acid in xylene under reflux.

以脂肪醛与丙二酸为原料，通过Knoevenagel反应制备了-3-烷烯羧酸，反应以二甲苯为溶剂，在回流条件下进行。

Establishing the specific phenotypic variant of methylmalonic acidemia requires studies on vitamin B12 responsiveness, C14 propionate tracer assays, complementation analysis, and cobalamin distribution assays.

要了解甲基丙二酸血症特异表型的类型需要进行维生素B12敏感性测试、C14丙酸盐示踪测试、互补分析和钴维生素分布分析。

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。