The respiratory activities of four Hansenula species.

The respiratory activities and the cytochrome spectra from four species belonging to the genus Hansenula have been analysed. The results obtained and described in this paper show that H. glucozyma possesses only the primary, antimycin A-sensitive respiration, H. anomala and H. californica possess primary and secondary (salicylhydroxamate-sensitive) respirations, whereas H. saturnus possesses three respiratory activities (AA-sensitive, SHAM-sensitive, and AA + SHAM-insensitive). The respiratory activity of H. glucozyma is glucose-repressible, whereas the activities of the other species are not. In addition, antimycin A (AA) and erythromycin (ERY) in the culture media differently inhibit the growth of the four species and regulate the respiratory pathways in the species analysed.