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Ann Intern Med. 1933;6(7):877-884. doi:10.7326/0003-4819-6-7-877
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There are phenomena in a considerable number which are produced in living systems by substances not normally present in these systems which sensitize them to light. These phenomena are described collectively under the term photodynamic action; they are of widespread occurrence and manifest themselves in various ways. As examples may be cited: the hemolysis of red cells and the destruction of bacteria by light and eosin, and the poisoning of domestic animals by substances ingested from buckwheat. As has been pointed out by Blum (1932), these phenomena are apparently based upon similar chemical reactions, since, so far as they have


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