Abstract
The effect of copper was tested on the growth of many strains of yeast. Plate culture on density gradient agar of copper was used for estimating the growth response to copper. Growth in many strains was more strongly inhibited by the copper-aquo complex than by the copper-amino acid complex. Debaryomyces hansenii IFO 023 was found a suitable strain for the present study, because it was not resistant, not producing H2S, and copper absorption by this strain was similar to that of the resistant strain. Growth of yeast cells in medium containing copper was affected by pH and concentration of amino acid in medium. Absorption of copper into intact cells was almost saturated for the initial few minutes. It was also affected by the addition of amino acid to copper solution. Our results indicated that the growth response of yeast to copper was closely related to copper absorption into cells. About 60 percent of copper absorbed into cells was distributed in the soluble fraction of the cell homogenate which was obtained by centrifugation at 105,000 g for 60 min.
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