Réversibilité de la réponse du potentiel de membrane chezNitella flexilis L. à des variations de pH |
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Authors: | J Lefebvre C Gillet |
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Institution: | (1) Département de Biologie végétale, Facultés Universitaires, 61, rue de Bruxelles, B-5000 Namur, Belgique |
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Abstract: | Summary The better the recovering of the membrane potential ofNitella on restoring the initial value of the external pH after a change, the more acid is the pH of the medium (Table I). On the other hand, a better repeatability was observed in alkaline solutions (Table II) for a change in the external K+ concentration. These results are interpreted as a manifestation of the binding of K+ ions to ionizable fixed charges (pK about 5–6) at the membrane surface and of the control of molecular structure of the membrane by the pH. |
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