Abstract
In the absence of oxygen, some Mucor species exhibit a yeast-like morphology and reproduce by budding. Bartnicki-Garcia and Nickerson (1962 a,b) showed that the yeast-like phase of Mucor rouxii took place only when hexoses were fermented and that it could be converted to the hyphal phase after a few hours of exposure to air. Haidle and Storck (1966 a,b) found that this conversion which required the synthesis of RNA and proteins was accompanied by the appearance of cytochrome oxidase activity. Recently Terenzi and Storck (1967) reported that a yeast-like phase was obtained in aerobiosis provided 0.2% ( v v ) of phenethyl alcohol (PEA) and a hexose (2–5%) were included in the growth medium. In the present paper it is shown that aerobic yeast-like growth involves an increase of alcoholic fermentation and a concomitant decrease of respiration. The data further suggest that PEA acts like an uncoupling agent and stimulates a Crabtree effect.
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