After tweaking the system to adjust the relative amounts of the enzymes, the researchers could feed their yeast a precursor chemical called thebaine, and get pure morphine in return.
在经过对植物体系进行酶相对数量的调整后，研究人员会在这些酵母中加入一种名为二甲基吗啡的混合化学物质，这样就会得到纯净的吗啡。
Tryptophan is an essential amino acid that ACTS as a precursor of serotonin - the feel-good chemical - and can be converted to melatonin, eliciting relaxation and pleasure.
色氨酸，一种非常重要的氨基酸，也是血清素(让人感觉良好的化学物质)的前导，会转换成褪黑色素，刺激加强松弛感和愉悦。
Carbs are also full of tryptophan, the amino acid precursor to the feel-good chemical serotonin produced in the brain.
碳水化合物富含色氨酸，它是大脑中生成的一种能给人带来良好感受的氨基酸—血清素的前身。
Due to the surface effect of nano particle, the precursor of nano oxide prepared by chemical precipitation method can form aggregation easily, and so can not be dried by usual techniques.
由于纳米粒子的表面效应，用化学沉淀法制备出的纳米氧化物的前驱体在干燥过程中易形成团聚，不易采用传统的加热方法干燥。
As the precursor of ancient glasses, faience and frit have different chemical compositions and structures from true ancient glasses.
釉砂和玻砂是古玻璃的前身，和古玻璃相比有着不同的成分组成和化学结构。
The earthquake precursor of hydrogeochemistry is one of the phenomena that the chemical processes occur in the crust and can be indicated by the chemical indexes.
地震水化前兆是发生在地壳内诸多地球化学过程并通过化学指标反映的现象之一。
This paper probes into the effects of process conditions on precursor fiber strength, elongation and chemical residual.
本文探讨了工艺条件对粘胶原丝强度、伸长及化学物残留量的影响。
This paper probes into the effects of process conditions on precursor fiber strength, elongation and chemical residual.
本文探讨了工艺条件对粘胶原丝强度、伸长及化学物残留量的影响。
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