硫酸

The results show that the yield of butyl acetate using the catalysts prepared with the concentration of H2SO4 by 0.5 mol·l-1 and the calcination temperature of 550℃ is the best,which is up to 52.5% when the molar ratio of butyl alcohol to acetic acid is 1:1.3 and without addition of entrainer in the hermetic reactor.

结果表明采用硫酸浸渍液浓度为0.5mol/L，焙烧温度为550℃时所制备的催化剂在正丁醇和乙酸的物质的量比为1.3及不添加任何带水剂的密闭条件下酯化效果最好，酯化率为52.5%。

"The active ingredient we used in this study, magnesium sulfate, is better known as Epsom salt," Thorp said.

"的活性成分，我们使用的这项研究，硫酸镁，是更好地称为泻盐，"索普说。

At 6 PM, take a teaspoon of Epsom salt 泻盐(magnesium sulphate 硫酸镁) with a glass of warm water.

在下午6点，喝一杯用温水冲一茶匙的泻盐。

I guide you not to utilize diuretics at this time but rather to drink lots of water to flush the potassium out of the system and take nightly 45-minute sits-baths in Epsom salts to draw the excess potassium out through the skin.

我指导你在这种时候不要去使用利尿剂，而宁可多喝水将系统内的钾排出，并每晚在泻盐（译注：即硫酸镁 MgSO4）里进行45分钟的坐浴，把过剩的钾通过皮肤排泄引出来。

Also there is much difference between the obtained metastable phase diagram at 35 ℃ and the metastable phase diagram at 25 ℃. The crystallization regions of schoenite(K2SO4*MgSO4*6H2O) and epsomite disappear and arise the crystallization regions of leonite and kainite.

所得35 ℃介稳相图与25 ℃介稳相图区别很大：软钾镁矾和七水硫酸镁结晶区域消失，同时出现了钾镁矾和钾盐镁矾的结晶区域。

These findings suggest a mechanism for the selective uptake of BPA into cells expressing estrone sulfatase.

由这些发现可推测细胞在表达雌激素酮硫酸酯酶时选择性吸收BPA的机制。

BPA is a substrate for estrogen sulfotransferase, and bisphenol A sulfate and disulfate are substrates for estrone sulfatase.

BPA是一个雌激素磺酸转移酶的底物，且二苯A硫酸盐和脱硫酸盐是雌激素酮硫酸酯酶的底物。

Anhydrous magnesium sulphate can be used and rinse with a little ether to extract all the freebase out.

无水硫酸镁可用于冲洗和一个小醚提取所有freebase了。

This article provided a new route to produce 4-dimethoxy phenethylamine. In basic condition, the product could be obtained through etherization, bromation, Grignard reaction, hydroxyethylation, esterification and Gabriel reaction with phenol as raw material, the overall yield is 45.0%.

提出了合成4-甲氧基苯乙胺的新方法，即在碱性条件下，苯酚首先与硫酸二甲酯反应，再选用高选择性的溴化剂溴化后，经格氏反应、羟乙基化反应和酯化反应，最后经Gabriel反应可以制备目标产物，反应总收率为45.0%。

Naphthol ethyl ether was sythesized with the ethanol and β-naphthol as materials and aluminium sulfate as catalyst.

介绍了以乙醇和β-萘酚为原料，在硫酸铝Al2(SO43.18H2O催化下合成β-萘乙醚的方法，讨论了反应时间，催化剂用量以及反应物摩尔比对合成的影响，确定了最佳反应条件。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷