An oxide containing the anion O₂⁻.
- ‘Catalase acts as a free radical scavenger by neutralizing superoxide radical anion and hydrogen peroxide.’
- ‘When the toxin is exposed to light, it reacts with oxygen to produce superoxide anions and singlet oxygen, which are also known as free radicals.’
- ‘Antioxidants, such as vitamins C and E, and antioxidant enzymes, such as superoxide dismutase and catalase, may play an important role in protecting the pathway.’
- ‘In pure water irradiated by ultrasound under aerobic conditions, it is possible to find free oxygen and hydrogen, hydrogen peroxide and superoxide, nitrous and nitric acids.’
- ‘Although the most common anion formed by oxygen is monatomic, oxygen can also form diatomic ions known as peroxides and superoxides (monovalent).’
We take a look at several popular, though confusing, punctuation marks.