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acid activity American amount animals annual appears applications Association Atomic cells chemical chemistry College complete containing culture Department Dept determined discussion effect electron energy engineering experiments field Foundation give given growth Health human important increase indicated Industrial Institute interest International Italy laboratory less light material mathematics means measure Medical meeting ment method Michigan nature normal Notes observed obtained organic percent period physics plants position possible preparation present Press problems production radiation range recent References response samples School Science scientific scientists Service Society solution species standard strain suggested surface Table theory tion United Univ University volume Washington York