查询词典 carbonate-apatite

By combining resolution and protection of DBSPINOL with menthyl chloroformate, the enantiopure SPINOL and other 4,4'-derivatives have been synthesized effectively via (1S)--4,4'-dibromo-l,r-spirobiindane-7,7'-diyl bis-menthyl carbonate with n-BuLi following reacting with electrophiles of I2, MeI, CO2 and water.

在制备其它衍生物反应中，薄荷醇碳酸酯成为羟基的保护基，DBSPINOL碳酸酯用正丁基锂处理后，再和亲电试剂作用合成了其它4，4'位二碘代、二甲基取代和二羧基取代SPINOL新化合物。

For the first time, enantiomers of C2-symmetric 1,1 -spirobiindane-7,7'-diol were resolved with crude menthyl chloroformate by phase-transfer catalysis in the presence of tetrabutylammonium bromide. The reaction was carried out at 0℃-rt. The diastereomers of SPINOL bis-menthyl carbonate can be separated by simple crystallization using alcohol. The hydrolysis of the diastereomers was carried out via aqueous NaOH/EtOH solution.

首次通过相转移催化的方法对螺双二氢茚二酚进行了有效的拆分，用L--氯甲酸薄荷醇酯做拆分剂，以四丁基溴化铵为催化剂在0℃-室温下进行酯化反应生成非对映体衍生物，以乙醇作溶剂，通过重结晶的方法分离衍生物，在水-乙醇混合溶剂条件下，用强碱NaOH或KOH分别水解，制得相应的光学纯度大于99%ee的两个异构体SPINOL，其中总收率：--SPINOL，78.2%；--SPINOL，80.6%。

The contact - metasomatic iron deposit, which emerges between intermediate - acid magmatic rock and carbonate rock, is controlled by geologic structure.

产于中酸性岩浆岩与碳酸盐岩接触带的接触交代型铁矿，受地质构造条件的控制，在安林地区形成了两条成矿带，包含8个矿田。

Medical heavy magnesium carbonate was made from soda (NaCO3) and magnesium chloride (Mgcl2*6H2O) by the metathetical reaction followed by pyrolysis,separation and desiccation.

方法用纯碱和盐卤作为原料，经复分解反应后再热解、分离、干燥制得医用重质碳酸镁。

Dimethyl carbonate is synthesized directly from carbon dioxide and methanol in the presence of magnesium methoxide .

报道一种在甲醇镁作用下，由二氧化碳及甲醇直接合成碳酸二甲酯的反应过程。

The direct synthesis of dimethyl carbonate from methanol and carbon dioxide using another basic catalyst, potassium methoxide in the presence of CH〓I as a promoter was investigated.

除了用甲醇于二氧化碳合成DMC以外，我们又对以甲醇与尿素为原料合成DMC的路线进行了尝试，筛选出了两个离子液体Et〓NHCl-FeCl〓和emimBr-ZnCl〓作为用甲醇与尿素为原料合成DMC的高效催化剂，研究了各种反应条件如原料的比例、催化剂的添加量、反应的温度等对反应的影响，得到了所报道的在间歇釜中经一步反应合成DMC的最高产率（27％和26％左右）。

Carbon dioxide ; Methanol ; Dimethyl carbonate ; Supported nickel methoxide complex ; SiO\-2 support

二氧化碳；甲醇；碳酸二甲酯；负载型镍甲氧基配合物； SiO2载体

The titration of the sodium hydrogen carbonate content in medicinal sodium bicarbonate tablet was compared with microburette under syringe control made on our own with conventional burette.

药用小苏打片中NaHCO3的微型滴定分析杨左海（咸宁医学院化学教研室湖北437100关键词小苏打片碳酸氢钠微型滴定法常规滴定法中图分类号O655.22小苏打片为NaHCO3加淀粉等压制而成，用于碱化尿液及酸血症，也可用于胃酸过多。

The main characteristics of the skarn are as follows:(1)occurring as bedded,para-bedded in the contact zone between carbonate and microclastic rock,and its occurrence being accordance to the strata;(2)cut by later vein rock,so having no relation with the magmatic rock on genesis;(3)metasomatic skarn having replacement remnant texture,pseudobreccia structure,while depositional skarn,particulate crystall...

研究表明该夕卡岩的主要特征为：(1)呈层状、似层状赋存于碳酸盐岩和细碎屑岩接触带，产状与地层一致；(2 )被后期脉岩穿切，成因上与岩浆岩无关；(3)喷流交代夕卡岩具交代残余结构和假角砾状构造，而喷流沉积夕卡岩具微粒状结构、雏晶结构和层纹、条纹、条带状构造，反映了二者不同的喷流成因；(4)发育典型的低温夕卡岩矿物组合，其形成温度小于30 0℃；(5 )夕卡岩的稀土配分型式与围岩的一致。

Studies show that the average ratio of w/w(P2O5)(1.62) of phosphates in submarine guyots is the same as that of w/w(P2O5)（1.621）of carbonate-fluorapatite, but is obviously different from that of w/w(P2O5)（1.318）of fluorine_carbonate, suggesting that the phosphates from northwestern Pacific are species of carbonate_fluorapatite.Three types of microneedle-microcolumnar, microgranular and microcryptocrystalline carbonate_fluorapatite with different abundances have been found.

海山磷酸盐的平均化学成分w/w(P2O5)（1.62）与碳氟磷灰石的w/w(P2O5)（1.621）几乎一致，而与氟磷灰石的w/w(P2O5)（1.318）相差甚远，表明海山磷酸盐为碳氟磷灰石，其形态主要有针状_柱状微晶碳氟磷灰石、粒状微晶碳氟磷灰石及显微隐晶质碳氟磷灰石3种类型，它们在分布丰度上存在差异。

Liapunov—Schmidt method is one of the most important method in the bifurcation theory.

Liapunov—Schmidt方法是分叉理论的最重要方法之一。

Be courteous -- even when people are most discourteous to you .

要有礼貌──即使当別人对你最不礼貌的时候。