With the new device, researchers can observe cells in real time as they grow in a three-dimensional collagen scaffold under precisely controlled chemical or physical conditions.

利用该新设备，研究人员可以实时观察细胞，因为它们生长在一个精确控制的化学或物理条件下的三维胶原支架中。

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With this in hand, she told Dr. Horvitz she planned to identify which of the worm's 302 neurons controlled its chemical-tracking behavior.

有了图在手，她告诉霍维茨博士她要找出蛔虫的302个神经元中哪个控制了它追踪化学试剂的行为。

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The process is controlled by chemical switches that stick on to genes and alter how active they are.

这一过程是由粘附在基因上并能改变基因活性的“化学开关”所控制的。

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Now that's pretty far fetched and not many people would say that a pop tart should be a controlled substance and regulated by government, but there are some very interesting chemical properties associated with foods like this that trigger things going on in the brain that affect us in a very big way.

这多少有点牵强,而且也没有很多人会认为,这种果酱馅饼应归为管制品,并受到政府监管,但有趣的是这种食品,确实有一些特别的化学特性,它会作用于大脑并会对我们产生大的影响

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Only last week, Ukrainian customs officials seized a Russian cargo ship bound for Libya and carrying a multilaterally-controlled chemical used in the production of rocket fuel.

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But the sputtering of the chemical onto the actual wafer has to be done in a very, very controlled fashion with very quick bursts of energy.

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