The toxicological tests showed that it was an actual non toxic agent without stimulation to skin, accumulative toxicity and mutagenicity.

毒性检测结果表明属实际无毒类，对皮肤无刺激，无蓄积毒性和致突变性。

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Whether or not they reflect the consequences of a poisoning can best be ascertained by demonstrating the presence of a toxic agent in a biological sample.

它们是否反映中毒的影响，通过证实生物检材中是否有毒物存在，就完全能得出定论。

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The next step for Wu and her colleagues is linking the non-invasive imaging advance with a treatment component, activating a toxic agent in the genetic payload to kill the spreading cancer cells.

Wu和她的同事的下一步工作是将先进的非侵入性成像技术和治疗环节联系在一起，激活导入的基因中的某一毒性物质来杀死扩散的癌细胞。

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According to the October 1994 Reader's Digest, Mr. Mirzayanov is personally aware of Russia's development of a class of binary chemical weapons (formed by combining two relatively safe chemicals to produce a toxic agent) nicknamed "Novichok" (Newcomer).

CENTERFORSECURITYPOLICY: A Noxious Arms Control Treaty

Avastin in colon cancer only works when combined with older chemo drugs, despite all the hype about it being a less-toxic targeted agent.

FORBES: Drawing The Line On Overpriced Cancer Drugs

But early tests showed that the drug was too toxic to be used as an anti-cholesterol agent.

FORBES: Magazine Article