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Abstract
Some physiological characteristics of Zygosaccharomyces rouxii strain No. F51, forming a film only on saline media, were investigated. When the strain was statically cultivated in a NaCl-hypertonic medium, it produced ethanol accompanied with the consumption of glucose in the early stage of the cultivation. Subsequently, the strain assimilated the resulting ethanol to form a film on the surface of the medium after the consumption of glucose. Isobutyl and isoamyl alcohols were transiently accumulated in the medium at an unusually high concentration during the film-forming growth of the strain. The total amount of lipids readily extracted from the film-forming cells (F-cells) grown in a hypertonic medium was about 4-fold as much as that extracted from the sedimentary cells (S-cells) grown in a salt-free hypotonic medium. The total amount of higher fatty acids (C14-Cl8) from F-cells was over twice as much as that from S-cells. Oleic and linoleic acids were the major fatty acid in F-cells. The quantity ratio of linoleic acid to oleic acid of F-cells was significantly high (0.5). It was suggested that the hydrophobic property of F-cells might be associated with the ability to assimilate ethanol only aerobically and to increase the total fatty acid content of cells.