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Summary: Molar growth yields have been determined for Saccharomyces cerevisiae, two laboratory strains of Saccharomyces carlsbergensis, Schizosaccharomyces pombe, Candida utilis and Metschnikowia pulcherrima under different anaerobic growth conditions. Yeast dry weight and analyses of end products were used for calculation of Y ATP. The reported data correspond to the theoretical Y ATP values calculated from material-balance equations. In complex media, Y ATP values averaging 11·2 and ranging from 9·2 to 14·0 were obtained shortly before glucose depletion. Lower values were observed in minimal media. Y ATP were highly dependent on growth time, and seemed to decrease linearly. The data presented indicate that a change in Y ATP from the accepted 10·5 to 15 to 18 may occur because of variation in time between inoculation and sampling. Previously reported Y ATP values are discussed.
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