UV rays increase the levels of reactive oxygen species - harmful molecules which damage the cells - in the skin.
Free rads are highly reactive oxygen molecules that damage cells and contribute to just about everything that can go wrong with skin, from dryness to crinkles.
Background - In the vascular system, elevated levels of reactive oxygen species (ros) produce oxidative stress and predispose to the development of atherosclerosis.
Learning how to stop the latter whilst preserving the useful functions of reactive oxygen species should be a major research priority in the next few years.
The growth of cancerous tumors is fueled, at least in part, by the buildup of free radicals-highly reactive oxygen-containing molecules.
"You cannot live without them, nor should you wish to, but they will probably help to kill you in the end," agreed Barry Halliwell of the National University of Singapore, of reactive oxygen species.
