Abstract
1) The respiration of a Sporobolomyces red yeast which is strictly aerobic, is not inhibited at all, but accelerated moderately by the addition of cyanide or CO.
2) The presence and functioning of cytochrome oxidase is demonstrated by the oxidation of the Nadi reagent and paramine, and photo-reversibility of the effect of CO.
3) Besides cytochrome oxidase, the existence of another oxidative enzyme system which is cyanide and carbon monoxide-insensitive, but sensitive to heat and to lower oxygen pressure, is presumed.
4) This enzyme system develops in the yeast most markedly in highly aerobic shaking culture and diminishes in anaerobic conditions.
5) The red yeast neither grows nor survives in the medium in the presence of cyanide, despite the accelerated respiration caused thereby.
6) The molar ratio, oxygen consumed to glucose burned, in respiration is ca. 1 without cyanide, whilst ca. 3 with cyanide.
