| The prints were made by placing leafy plants near paper that had been photochemically treated with palladium salts. |
| In the atmosphere, benzene exists mainly as a gas and is degraded when it reacts with hydroxyl radicals that are formed photochemically. |
| It shows that toluene, a fairly simple and nonmutagenic hydrocarbon found in virtually all urban air, can be converted photochemically into gas-phase mutagens. |
| Some increases have also occurred during the recent warm days, he said, when sunlight has reacted photochemically with gases and the atmosphere to produce more particles. |
| During the oxidative stress of constant ultraviolet radiation, at least one photochemically active tryptophan metabolite, N-formyl kynurenine, is formed in the lens. |
| When released into the air, this material may be moderately degraded by reaction with photochemically produced hydroxyl radicals. |
