Effects of the Oxygen Molecule

This is a microbiology paper. The focus needs to be specific to the effects of oxygen both positive and negative, on microorganisms as well as the human system. Nothing about oxygen in the atmosphere, or in the ocean, or space. I don’t need the origin, or chemistry, unless it pertains to microorganisms, or cellular level. The page will be put through plagiarize software so siting is important. I would like sources that come from microbiology if possible.