Membrane potentials in yeast cells measured by direct and indirect methods.

ABSTRACT

The membrane potential, delta psi, of various yeasts estimated from the distribution of tetraphenylphosphonium cations ranged from -50 to -120 mV, depending on species, incubation conditions and technique of measurement. Values obtained directly with a microelectrode in Endomyces magnusii were consistently lower than those determined indirectly.