Abstract
AbstractThe harmonics of an electric current passing through a yeast suspension exhibit particular patterns according to the biological activity of the cells, constituting the nonlinear dielectric response of yeast cells, and the measurement of these patterns is a technique for determining the activity of living cells. The concentrations of glucose and oxygen in yeast culture medium influence whether fermentation or respiration of the yeast cells occurs. Measurements were made with yeast cells (Saccharomyces cerevisiae) cultured aerobically and anaerobically at sufficient glucose concentrations (aerobic and anaerobic fermentation), and also under aerobic conditions at a limited glucose concentration (respiration). The results showed that the harmonics were barely detectable for yeast cells in aerobic fermentation and respiration, but that cells in anaerobic fermentation produced substantial third and fifth harmonics. It is inferred that environmental conditions affect yeast cells' nonlinear dielectric response; furthermore, it appears that measurement of these nonlinear properties may be an effective means of determining the activity of yeast cells adjusted to the conditions of their cultivation. © 2009 Wiley Periodicals, Inc. Electron Comm Jpn, 92(9): 17–23, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecj.10094
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