碳酸

The group of low migration nucleases were prepared by ammonium carbonate processing +acid denaturation + thermal denaturation + acetone extraction.

在提取过程中产生两组核酸酶，在SDS-PAGE-DNA功能胶中迁移率较慢的一组采用碳酸铵处理+酸变性+热变性+丙酮沉淀的提取方法来获得较好的层析样品。

The research was mainly based on the formation condition of crystalline ammonium yttrium carbonate and the variation characteristics of pH value during the crystallization in which NH4HCO3 was used to precipitate yttrium ion.

对碳酸氢铵沉淀钇时碳酸钇铵复盐结晶的形成条件与pH变化特征进行了研究，发现其结晶过程与平衡溶液pH有对应关系。

This paper has compared a green chemistry technology of ammonium eerie nitrate with the classical technology by atom economy.

从原子经济性出发，对以碳酸铈为原料合成硝酸铈铵的绿色化学工艺与传统工艺进行了对比。

The process,using strontium nitrate and ammonium bicarbonate as raw materials to develop and produce high purity strontium carbonate is introduced.

介绍了以硝酸锶和碳酸氢铵为原料，研制生产高纯碳酸锶的工艺过程。

Dimethylhexane-1,6-dimethyleurethane is the key material for preparation of 1,6-hexamethylene diisocyanate by non-phosgene route. Our work mainly focuses on the study of the catalytic performances of metal oxysalts and metal oxides for the ammonolysis of DMC to HDU-M. Experiment effect showed the ammonolysis was omposed by two steps, in which the first step was easier to occur than the second.

中文摘要六亚甲基-1，6-二氨基甲酸甲酯是非光气合成六亚甲基二异氰酸酯的关键原料，本文主要对金属含氧酸盐和金属氧化物这两类用于碳酸二甲酯胺解合成HDU-M 的催化剂进行了初步研究并优化了工艺条件。

So the effect of different solvents, such as methanol, ethanol, butanol, tertiary butanol, isoamyl alcohol, tertiary amyl alcohol, diethyl ether and cyclohexane, on the reaction was explored.

在文献所报道的应用K〓CO〓作催化剂、CH〓I既作促进剂又作部分反应物的由原料甲醇与二氧化碳直接合成碳酸二甲酯工作的基础上，在体系中加入离子液体emimBr后，研究了emimBr对合成反应的影响。

Anisaldehyde was synthesized from p-hydroxybenzaldehyde with dimethyl carbonate by microwave irradiation under phase transfer catalyst tetrabutylammonium bromide, The effect of power, time, solvent and catalyst of reaction on yield were researched.

以四丁基溴化铵为相转移催化剂，采用对羟基苯甲醛和碳酸二甲酯为原料，微波辐射下合成大茴香醛。考察了反应溶剂、功率、时间和催化剂对反应产率的影响。

By analyzing the differences between acidic and basic catalytic action in this transesterificatios, it is considered that the main cause of yielding an anisole by-product is due to the basic catalysis, a Lewis acidic catalyst is helpful for the selective DPC formation.

通过分析酸碱催化作用在酯交换反应中的差异，认为碱催化是副产物苯甲醚生成的主要原因，Lewis酸性的催化剂有利于碳酸二苯酯的高选择性。

For the aged critical illness patients with acute heart failure,MV could relieve anoxemia, hypercapnia and respiratory insufficiency effectively, and obviously increase success rate of emergency care.

机械通气能及时有效地缓解老年急性左心衰患者的低氧血症、高碳酸血症和呼吸功能障碍，明显提高老年急性左心衰患者的治疗抢救成功率。

Anoxemia Hypercapnia Morris water maze Choline acetyl-transferase Puerarin

低氧血症；高碳酸血； Morris水迷宫；胆碱乙酰转移酶；葛根素

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。