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。
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.
木质素是植物体中仅次于纤维素的一种重要大分子有机物质，在植物体中含量为15% - 30%。
Lignin is a kind of important macromolecular organic material and only inferior to cellulose inside plant, with a content of 15%-30%.
说明高温可加速叶片衰老，并影响植物体其他内源物质的变化，且有可能进一步降低作物光合能力。
The high temperature stress accelerated the senescence of leaf and caused the changes of other inner source substances, and then could reduce photosynthesis capability of the crop.
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