There are indications that pleiotropic plant hormones may actually function by activating the enzymes that release these other, more specific chemical messengers from the cell wall.

有迹象表明，多效性植物激素实际上可能通过激活酶来发挥作用，这些酶从细胞壁释放出这些更为特殊的化学信使。

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Microbes are finely tuned to inhabit specific chemical or physical niches where they've got an advantage.

微生物能很好地适应它们生活的物理化学环境。

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Instead of needing to be activated by a specific chemical messenger, the engineered fat cells are always active.

它们常常处于激活状态，而不需要受特殊化学信号激活。

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These are things that must be taken in from the environment because your body cannot manufacture them and they promote specific chemical reactions in the body.

这些都是必须从外界摄取的物质,因为无法通过自身合成,它们能促进体内特定的化学反应

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Don't worry about how they work in the immune system, but what if you could manufacture antibodies then you could make a chemical, an antibody, that is capable of binding to a specific other chemical and you could use that for things.

别管它们在免疫系统内是怎么工作的,只要考虑能不能制造抗体,那么假设你能制造这种化学物质 抗体,抗体又能够同其他特别的化学物质结合,你就可以让抗体为我所用

耶鲁公开课 - 生物医学工程探索课程节选

The Biosensor works by incorporating antibodies to the specific chemical (drug, hormone, viral protein or pesticide, for example) that it has been designed to detect.

ECONOMIST: Medical diagnostics

Nano bar codes are the molecular versions of traditional bar codes--metal nano-particles that have specific, recognizable chemical fingerprints that can be read by a machine, perhaps a UV lamp or optical microscope.

FORBES: Safer And Guilt-Free Nano Foods

This would permit the detection of chemical signatures associated with specific atmospheric gases and perhaps even some surface processes.

BBC: Kepler telescope spies 'most Earth-like' worlds to date