Jisho

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Noun
1. reactive oxygen (i.e. free radicals, which can be destructive at high concentrations)Chemistry
Wikipedia definition
2. Reactive oxygen speciesReactive oxygen species (ROS) are chemically reactive molecules containing oxygen. Examples include oxygen ions and peroxides. Reactive oxygen species are highly reactive due to the presence of unpaired valence shell electrons. ROS form as a natural byproduct of the normal metabolism of oxygen and have important roles in cell signaling and homeostasis. However, during times of environmental stress (e.g. , UV or heat exposure), ROS levels can increase dramatically.
Read “Reactive oxygen species” on English Wikipedia
Read “活性酸素” on Japanese Wikipedia
Read “Reactive oxygen species” on DBpedia

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