Abstract
It has been shown that neither the soluble proteins nor the separated soluble low molecular material of Tenebrio tissue homogenates could activate samples of latent phenolase. Only the precipitate after centrifugation of a larval homogenate contained a thermostable factor able to convert the prophenolase into an active enzyme. This factor, the presence of which could be demonstrated in larval integuments, was a lipid. Further analysis showed that especially C-18 fatty acids exercise a high activating power on latent phenolase. As lipase activity was detected in the subcuticular fat and tracheal oenocytes, a hypothetical mechanism for the activation process was drawn up considering published data.
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