There is a growing evidence for a correlation between free radicals and the formation of diseases. Free radicals or oxidative stress are expected to be linked to various pathogenic conditions which impact cells. The oxidative stress is a result of an imbalance between reactive oxygen species and antioxidants. In this project we would like to study the free radicals production in living cells, under which condition and where they are generated. We plan to use different cell types to investigate the effect of different mechanism to produce more free radicals in a living cell. We will use a technique called diamond magnetometry, which utilize nano-diamonds to detect free radicals