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Oxygen Radicals in the Pathophysiology of Heart Disease Gisela Dies gefährdet die Grundlage jedesOver two centuries ago, oxygen was discovered as "air vital": the component of the earth's atmosphere necessary for life. Less than five years after this discovery, it was found that oxygen was both a life sustaining and life threatening inhalant as it plays a role in the two extremes of the animal kingdom: life and death. In the subse quent years, we have made major strides in understanding the role of oxygen in maintaining life and volumes of