乙酸的

Thus, the thermodynamic equilibrium was shifted and the yield of cyclic carbonates was improved.

在乙腈体系中，以不同的乙酸盐作催化剂，研究了CO2与二醇合成环状碳酸酯的反应。

It was found that the stability of the nickelchelates is in accord with the base strength of the amino acids,and these chelates shou...

实验结果表明镍的络合物具四面体结构，N-萘氨基乙酸镍的顺磁性亦证明此点。

N-dodecylethylenediaminetriacetic acid is a new type of chelating surfactants, which were in need of developing non-phorus detergents.

N-十二烷基乙二胺三乙酸是一种新型螯合性表面活性剂，是应无磷洗涤剂的研发要求而问世的。

The watermelon sample was extracted with ultrasound,protein was precipitated with potassium ferrocyanide and zinc acetate,and the pigment was decolored with activated carbon,nitrate would produce yellow compound with phenonldisulponic acid on condition of base.

在超声器中提取西瓜样品，用亚铁氢化钾和乙酸锌沉淀蛋白，活性碳脱色素，酚二磺酸碱性条件下和硝酸盐生成黄色化合物，样品的硝酸盐检测结果有较好的准确度和精密度，能满足样品分析需要。

Methods: fudr was esterified with acetic anhydride in the presence of pyridine and 4 dimethylaminopyridine.

在吡啶和4 二甲氨基吡啶存在时，fudr与乙酸酐反应，制备氟尿苷二乙酸酯，并测定其核磁共振氢谱。rp hplc测定其在正辛醇和磷酸盐缓冲液中的分配系数及不同ph缓冲液和组织匀浆中的稳定性。

A second bug experienced a mutation that allowed it to make use of the acetate excreted from the first.

第二个细菌经历的变异使它能够利用第一个细菌分泌出来的乙酸酯。

This is a special reaction of arginine's carbamidine, which is useful in quantitating and determining the natures of protein and the amino acid.

这是由于蛋白质分子中精氨酸胍基的特征反应。许多胍的衍生物如胍乙酸、胍基丁胺等也发生此反应。

At last, the effective approach was found that the 024-antibiotic can be purified by freez-dry, methyl alcohol soaking, acetone, chloroform, and methyl alcohol continuously washing, alumina and silica gel column chromatography.

粗提制品的理化性质研究表明，024放线菌所产抗生素为无色晶体，易溶于水，可溶于甲醇和乙醇，且在甲醇中的溶解度较大，不溶或难溶于丙酮、氯仿、正丁醇、乙酸乙酯与苯。

For example, pulverized wood samples can be treated with acetyl bromide in acetic acid, and the absorbance of the resulting solution at 280 nm can be compared with the absorbance obtained from known lignin standards.

例如，将木屑样品在乙酸环境下与乙酰溴进行反应，再将280纳摩尔所得溶液的吸收率与已知的木质素标准吸收率进行比较。

However, at 92℃, the concentration of acetic acid showed little influence on hydrolysis degree.

在不同条件下，乙酸能将18C型肺炎球菌荚膜多糖水解为不同大小的片段，且未破坏抗原决定簇的基本结构。

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。