Abstract
It has been demonstrated that the terminal electron transport pathway of Mycobacttium phlei resides in a particulate fraction of the organism (1). Evidence also has been obtained suggesting that a naturally occurring naphthoquinone is involved as an oxidation-reduction component in this pathway (2). Since a naphthoquinone may be involved in this system, the possibility exists that naphthosemiquinone radicals may be formed as a consequence of the associated oxidation-reduction events.