大多数生物依赖氧而生存,氧在食物氧化过程中作为电子接受体,并被还原为无毒的水,氧成为许多生物代谢必需成分。然而暴露于氧气中有危险,氧浓度稍高于空气中的氧浓度时就显示出较高的毒性,这种毒性在肿瘤、老化、炎症和外源物代谢等生物学过程中起重要作用。据认为氧的毒性效应是由于氧分子在最初 Most organisms depend on oxygen for survival. Oxygen acts as an electron acceptor in food oxidation and is reduced to nontoxic water, which is an essential component of many biological metabolites. However, exposure to oxygen is dangerous, and oxygen concentrations slightly higher than those in air show high toxicity, which plays an important role in biological processes such as cancer, aging, inflammation and exogenous metabolism. It is believed that the toxic effects of oxygen are due to the initial oxygen molecule