not to join in this little tit for tat thing that you've got going on, but
There are many mechanisms involved in radiation damaging cells, free radicals being one. But siting a reference for radiation protection to try and back up caffine as a potent free radical agent is poor to say the least
edit-just read your above response which wasn't there when I made this reply.
I see what your getting at now. Basically the radiation was the thing they used to speed up the free radical effect (ie artifically increasing the oxidation) of the rat liver tissues and so shortening the time span of the study by increasing the rate of deterioration.
Kinda makes sense, I can't argue with the study, I guess they had their reasons for using radiation (time frame being the only one I can think of)
Rat liver mitochondria are irradiated with 60Co g -rays and the activity of superoxide dismutase (SOD), an enzyme that breaks down superoxide is monitored. Their result establishes that radiation-induced loss of SOD activity is prevented by high concentrations of caffeine. These authors had earlier reported the action of caffeine as a radioprotectant (J. Radiol. Protection, 1991, 19, 171), in a study that promoted an estimate that 100 cups of coffee might be necessary to protect a 70 kg individual against similar radiation exposure (New Scientist, 1999, 26 June, p. 12)!
There are many mechanisms involved in radiation damaging cells, free radicals being one. But siting a reference for radiation protection to try and back up caffine as a potent free radical agent is poor to say the least
edit-just read your above response which wasn't there when I made this reply.
I see what your getting at now. Basically the radiation was the thing they used to speed up the free radical effect (ie artifically increasing the oxidation) of the rat liver tissues and so shortening the time span of the study by increasing the rate of deterioration.
Kinda makes sense, I can't argue with the study, I guess they had their reasons for using radiation (time frame being the only one I can think of)