Exposure to UV light can cause adjacent pyrimidines to dimerize, while oxidative damage from free radicals or strong oxidizing agents can cause a variety of lesions that are mutagenic if not repaired.
Most of the cell's ATP is produced when the products of glycolysis are oxidized completely by a combination of the tricarboxylic acid cycle and oxidative phosphorylation.
Another consideration is the molecular inflammatory theory of aging, whereby the activation of redox- (oxidation-reduction) sensitive transcription factors (molecules that control gene activity) by age-related oxidative stress causes increased expression of proinflammatory genes, leading to inflammation in various tissues.
The authors propose a mechanism for milk's harmful effects – its high content of D-galactose (galactose is a sugar), which is shown to cause oxidative stress, inflammation and ageing in animal studies.
Each would carry a fluid doped with vanadium ions, but those ions would be in different oxidative states in the different channel systems at least, they would be when they entered the chip.
If these locks are picked (for example by oxidative damage to the genes that control them, as discovered by Dr Ames), the result is unconstrained growth in other words, cancer.
Boosting their levels seems to compensate for oxidative damage to this enzyme.
The brain, he observes, is peculiarly susceptible to oxidative damage.
He wonders whether birds suffering oxidative stress increase their antioxidant consumption by choosing fruits with high anthocyanin content rather like starting the day with a glass of orange juice when you feel a cold coming on.
It has been linked to cellular ageing and cardiovascular disease, and a connection between oxidative stress in general and neurodegenerative disease in particular has been suspected for a long time.
One group that has been evaluated, the polyphenols, has been shown in rodents to reduce oxidative damage and to boost the ability to learn and retain memories.
