stoichiometry: determination of the proportions (by weight or number of molecules) in which elements or compounds react with one another.

chlorinated aromatic hydrocarbons and their derivatives are the persistent organic compounds, which are toxic or not easy to degrade.

氯代芳烃及其衍生物是一类毒性强、难降解的持久性有机化合物。

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i think refining the compounds in terms of the balance of their activities is really key, but that's not to say that's trivial .

我认为，以平衡药物各项作用的方式来改进化合物的确是关键，但是这并非小事，它需要时间。

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the organic compounds unable to be synthesized under normal reaction can be fulfilled by means of umpolung.

在有机合成中一些不能用常规反应合成的有机化合物可以通过极性转换的方式来完成。

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the changing trends of total and reducing sugar contents were all opposite to that of n compounds.

总糖和还原糖含量的变化趋势均与含氮化合物的变化趋势相反。

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carbide: inorganic compound, any of a class of chemical compounds in which carbon is combined with a metal or semi metallic element.

碳化物：碳与金属或半金属元素化合而成的一类化合物的总称。

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and (2) an ion exchange step in which at least the acid catalyst of acidic compounds is removed by an anion exchange resin.

离子交换工序，通过阴离子交换树脂至少除去酸性化合物中的酸催化剂。

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the known, and yet to be discovered, synergistic compounds found in food and necessary for proper nutrient delivery.

已知的，但尚未被发现，在食物中发现的化合物，并进行适当的协同提供必要的营养。

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this technique is often used for compounds which are unstable at high temperatures.

这项技术常常用于高温下不稳定的化合物的蒸馏。

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hundreds of compounds, including antioxidants, seem to be responsible for coffee's many protective benefits.

咖啡中含有包括抗氧化物在内的上百种化合物，这似乎就是咖啡有益于健康的原因。

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though by no means the only factors in halitosis , the volatile sulfur compounds produced by bacterial metabolism are a prime suspect.

细菌代谢所产生的挥发性硫化物，虽不会是造成口臭的唯一凶手，但却是主嫌。

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but, since the late 1700s, compounds of the metal have also been used to treat leukaemia.

但是从十八世纪后期，金属配合物就用来治疗白血病。

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and there must be simple substances, since there are compounds; for a compound is nothing but a collection or aggregate of simple things.

由于存在复合物，因此必然存在单纯物，所谓复合物，即单纯物的集合。

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indirect photometric detection in ce is often employed for detection of compounds that lack of suitable chromophores.

间接光度检测通常是用来检测并行工程的化合物，缺乏合适的发色团。

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developing an efficient synthetic route to natural product compounds and their analogs is often an essential step in drug development.

发展一种自然产物复合物以及类似物的有效合成途径在药物研制过程中经常是必需的步骤。

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one of these studies has found that of the ten licensed compounds tested, only azt inhibited replication of xmrv.

其中一个研究已发现在十个已测的得到批准的混合物中，只有AZT（艾滋病防护药）抑制了XMRV的繁殖。

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because compounds of this type contain only single bonds they are often referred to as saturated hydrocarbons.

因为这类化合物只含有单键，所以它们常被称为饱和烃。3.Some are new compounds which have been used for only a few years.其中一些化合物是近几年开始使用的。

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smoke rose into the night sky from one of the attacked compounds, and a helicopter circled overhead, scanning the ground with a searchlight.

被引爆的居民楼处浓烟直冲云霄，直升机在楼上空盘旋，探照灯来回搜索地面。

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however, the prediction was remarkably accurate, if not a bit understated, for the reactivity of these compounds.

然而，预测是非常准确的，如果不是有点低估，对这些化合物反应。

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in this work we carry out a study of pattern recognition to detect the microbiological activity in a group of heterogeneous compounds.

在这项工作中，我们进行研究的模式识别检测微生物活性的一组异质性的化合物。

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the food is allowed to dry, and then is usually sprayed with fat, digests , or other compounds to make it more palatable.

然后，狗干粮将被烘干，一般上生产商都会喷洒一些油脂、消化液，或者其他化合物使它更加美味。

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