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Gen Physiol Biophys. 1996 Apr;15(2):175-9.

Ba2+ ions hyperpolarize algal cell membrane and enhance plasmalemma resistance without affecting ion and water contents.

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Institute of Microbiology, Academy of Sciences of the Czech Republic, Prague, Czech Republic.


Culturing the fresh-water alga Hydrodictyon reticulatum for 9 days in the presence of 0.2 and 0.4 mmol/l Ba2+ increases the membrane potential about twice and the plasmalemma resistance 5-10 times without having any significant effect on the cell contents of water and Na+, K+ and Cl- ions. While in control cells the membrane potential is determined by the diffusion potential of K+, in Ba(2+)-treated cells the factor determining membrane potential and resistance is the unequal distribution of protons across the membrane.

[Indexed for MEDLINE]

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