Oxygen in Biology and Biochemistry : Role of Free Radicals

  title={Oxygen in Biology and Biochemistry : Role of Free Radicals},
  author={Marcelo Hermes-Lima},
A free radical is defined as any atom or molecule that contains unpaired electrons and has independent existence (hence, the term free). A dot is used to represent a free radical species. The abstraction or gain of one electron by a nonradical molecule may (or may not) convert it to a radical species. Free radicals can have positive, negative, or neutral charges [reactions (12.1.1) and (12.1.2)]. 
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Biological consequences of free radical-damaged DNA bases

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