For ten years Dr. George Speri Sperti and his associates in Cincinnati have been studying the effects on yeast cells and other organic material of ultraviolet radiation obin the short, lethal wave lengths. It was noticed that when some cells were injured by radiation, the life processes of uninjured cells were stimulated. The Cincinnati researchers radiated some yeast cells long enough to kill them all, then took the fluid containing the cell corpses, centrifuged and filtered it, added it to a suspension of normal cells. The "respiration" (oxygen intake) of these was...
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