deactivate

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When metal is poured and solidifies in green sand molds, it heats some of the sand mixture to the pouring temperature of the metal, evaporates some water and deactivates part of the bentonite and additives.
"That means a drugs that deactivates telomerase would likely work against all caners, with few side effects."
Plants produce oxygen during photosynthesis, and oxygen deactivates the enzyme that makes hydrogen.