In any case, its activity is profoundly modified by various factors, which may be of either nervous or chemical origin.

无论如何，它的活动受到各种因素的强烈影响，这可能是神经因素，也可能是化学因素。

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Textile dyes, such as indigo, were mostly of plant origin until the advent of synthetic chemical dyes.

在合成化学染料出现之前，诸如靛蓝之类的纺织染料主要来源于植物。

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These capacities also include outbreaks of chemical, radiological and food origin.

这些能力也涉及化学、放射性和食源性事件的暴发。

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Colpan, a chemical engineer of Tatar origin, wrote his doctoral thesis on DNA cleansing at the Darmstadt Institute of Technology in 1983.

FORBES: Gold digger

But there's also a natural way to get your hands on it--dig it out of the ground in Wyoming. (The natural origin may or may not endear this chemical to the greenies.) The primary use of soda ash is to make glass.

FORBES: Magazine Article

And this week George Papandreou, the Greek prime minister, met successful businessmen of Hellenic origin from five countries (such as Andrew Liveris, chief executive of America's Dow Chemical company), in the hope that they could lend their struggling homeland some badly needed pizzazz.

ECONOMIST: Diasporas