Abstract
1. 1. Isolated mitochondria from the whole southern armyworm larvae, Spodoptera eridania, show all of the characteristics of mammalian liver mitochondria, except for target site sensitivity to cyanide. 2. 2. The armyworm larval mitochondria are 17 times less sensitive to cyanide when compared to rat liver mitochondria and cannot be completely inhibited with extremely large doses. 3. 3. These data suggest the presence in the southern armyworm of either a cyanide-insensitive cytochrome oxidase, or the elaboration of cyanide-insensitive oxidative pathway reminiscent of an alternative oxidative pathway that is known to coexist in plants alongside the cyanide-sensitive pathway.
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