查询词典 purity

Crude EO was then dissolved with ethanol, frozen at - 15 ℃ for 48 h, and centrifugally separated and filtered to get rid of impurities. The final product EO with yield of 2.09 ％ and purity of 99.0 ％ was then obtained after distilling the liquor under vacuum.

往精油粗产品中加入乙醇溶解，放入-15℃冰箱中冷冻48 h，离心分离去除树脂状物质，过滤，滤液进行真空浓缩后，即得精油，产率约2.09％，精油纯度99.0％。

The synthesis method comprises the following steps: adding 2-( 5-(dimethylamino methyl- 2- furyl methyl sulpho ethylamine and 1- methylthio- 1- methylamino- 2- nitro ethylene with a molar ratio of 1.04: 1 into water, heating to 48- 52 Deg. C, reacting 4.5 hours with a vacuum degree of 0.02- 0.05 MPa, cooling, adding sodium-hydroxide of concentration of 10% to regulate the PH value to 11.0- 11.4, filtrating and cooling the filtrate to 0- 2 Deg. C, crystallizing for 12 hours, centrifugally filtrating, and rinsing filter cake with purity water to prepare wet ranitidine alkali; dissolving ranitidine alkali in alcohol and reacting with chlorhydric acid to prepare ranitidine hydrochloride.

合成方法包括：将摩尔比为1.04∶1的2-(5-(二甲氨基甲基-2-呋喃基甲基硫代乙胺与1-甲硫基-1-甲胺基-2-硝基乙烯加入水中，升温至48-52℃，于真空度0.02～0.05MPa反应4.5小时，反应完毕降温，用10％氢氧化钠溶液调pH＝11.0-11.4，抽滤，滤液降温至0～2℃，结晶12小时，离心甩滤，用纯化水漂洗滤饼，得雷尼替丁碱湿品；将雷尼替丁碱溶于乙醇中与盐酸反应，制备得到盐酸雷尼替丁，产品符合欧洲药典标准。

After centrifugation,the purity of the crude product was 23%.

离心分离后，血红素粗品的纯度为23%。

Among them,CsCl density gradient centrifugation is often used,because product purity is good by this method.

在纯化病毒的方法中，氯化铯密度梯度离心法是较为常用的方法之一，方法简便易行，获得的病毒样品较纯。

RESULTS: Higher purity of human BMSCs could be achieved by the density gradient centrifugation.

结果：密度梯度离心结合贴壁法能分离培养出纯度较高的人骨髓间充质干细胞。

"In September 2008 around 99.9 percent purity cerium oxide is 18 yuan / kg, while the highest sold over the past 30 yuan / kg," said董森"high-tech electronics, laser, communications, superconducting materials, such as the need for Rare Earth, but China's rare-earth prices has not gone up, not their own pricing, it is a disadvantage."

"在2008年9月前后，纯度为99.9％的氧化铈为18元/公斤，而过去最高卖到30元/公斤，"董森华说，"高科技电子、激光、通讯、超导等材料都需要稀土，但中国的稀土价格并没有水涨船高，无法自己定价，很吃亏。"

This official recognition with Britain's longest established Organic Certifier guarantees the purity of the Trevarno range and assures customers that products are both ethical and sustainable.

这位官员承认，与英国的最悠久的有机验证，保证纯度的trevarno范围，并保证客户的产品，都是道德和可持续发展。

The research consists of three parts: First is to prepare the five high-purity synthetic evaporite minerals powders, including gypsum, calcite, chalcanthite, nitratine and hydromagnesite, and to verify their phases and purities by XRD. Second is to conduct a series of thermal decomposition experiments of the powders by TGA at various heating rates and isothermal condition.

实验设计上可分为三部分，首先准备符合石膏、方解石、胆矾、钠硝石与水菱镁矿等五种矿物成分之试药等级粉体，再以XRD确认其矿物相是否正确；第二部分以热重分析仪进行等升温与等温条件热分解实验；最后以三种动力学方法分析拟合热重分析所得到的反应数据。

The others seemed like archangels of purity: they changed their clothes in front of me, bathed me when they bathed, sat me on my chamber pot and sat on theirs facing me to relieve themselves of their secrets, their sorrows, their rancors, as if I did not understand, not realizing I knew everything because I tied up the loose ends that they themselves left dangling.

其他人看上去就像纯洁的天使长：她们当着我的面更衣，她们洗澡的时候让我也跟着一起洗，她们让我坐在我的夜壶上，她们则坐在她们的夜壶上，对着我说出她们的秘密、她们的忧伤、她们的仇恨，好像我不懂似的，她们不会想到我什么都知道，因为我把她们说出的零零碎碎，都拼在了一起。

No, that would cheapen the purity of your achievement.

对 这样就玷污了你纯洁的出发点

The two-acre Dunbar Community Garden in Little Rock has served as a model for several years.

几年来，坐落于小石城，占地两英亩的邓巴社区菜园树立了一个标杆。

Jerry points to the jacket hanging in the bathroom. It's ruined, and unwearable What?

杰瑞指着洗手间里挂着的夹克，毁了，不能穿了）什么？