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H+ and K+ fluxes and attendant processes inCandida utilis induced by inhibitory ethanol concentration

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Abstract

In oxygen-aerated non-growing cells a subinhibitory ethanol concentration (1 g/L) causes an H+/K+ exchange. An inhibitory ethanol concentration (30 g/L) slows down acidification but has no effect on its extent. The transmembrane ΔpH depends directly on the ethanol level in the medium and is not lowered at high ethanol concentrations. Changes in membrane potential induced by ethanol are also concentration dependent. The high ethanol level does not increase the passive permeability of cell membrane to H+.

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Abbreviations

p(K+):

−log10([K+])

ΔpH:

pHout−pHin

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Authors and Affiliations

  1. Institute of Microbiology, Czechoslovak Academy of Sciences, 142 20, Prague 4

    A. Prell & K. Sigler

  2. Institute of Chemical Technology, 166 28, Prague 6, Czechoslovakia

    J. Páca

Authors
  1. A. Prell
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  2. J. Páca
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  3. K. Sigler
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Prell, A., Páca, J. & Sigler, K. H+ and K+ fluxes and attendant processes inCandida utilis induced by inhibitory ethanol concentration. Folia Microbiol 37, 39–42 (1992). https://doi.org/10.1007/BF02814577

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  • DOI: https://doi.org/10.1007/BF02814577

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