deactivate

A chemical reaction can convert two polluting greenhouse gases into valuable building blocks for cleaner fuels and feedstocks, but the high temperature required for the reaction also deactivates the catalyst.

"They provide a suitable reaction environment and hold the nanoparticles in place. Normally, the particles tend to aggregate, which means that less of their catalytic surface is accessible and they deactivate."

Lt Col Hugo Clark, 54 is accused of taking a deactivated explosive through security at Edinburgh Airport on 16 October.

This drains the copper pools in the cells and deactivates the biomolecules that require copper.

The downstream station had been deactivated for many years and the upstream station was still active.