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These nanozymes mimic the activity of peroxidase, an enzyme that catalyzes the oxidation of a substrate by using hydrogen peroxide as an oxidizing agent.

He added they suspected a strong oxidizing agent might have gotten into the water causing the oxygen levels to rise sharply, which can harm fish.

Sodium nitrate is listed online as an oxidizing agent and is known to preserve foods.

Several powerful oxidizing agents have been generated using light excitation, but strong reductants have been more difficult to produce.

Agents reported finding hand-drawn schematics and component parts of a destructive device, including flammable liquids, oxidizing agents and circuit boards.