Permeability of the Chara cell membrane for ethylene glycol, glycerol, meso‐erythritol, xylitol and mannitol

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<jats:p>The permeability of internodal cells of <jats:italic>Chara australis</jats:italic> R. Brown for polyol molecules was determined by using a turgor balance to measure the increase in the osmotic pressure of an internodal cell incubated in artificial pond water containing one of the polyol compounds tested. The permeabilities for ethylene glycol, glycerol, <jats:italic>meso</jats:italic>‐erythritol, xylitol and mannitol were (4. 39 ± 0. 52) × 10<jats:sup>−9</jats:sup>, (1. 49 ± 0. 40) × 10<jats:sup>10</jats:sup>, (4. 92 ± 0. 27) × 10<jats:sup>−10</jats:sup> (9. 9 ± 3. 4) × 10<jats:sup>11</jats:sup> and (7. 6 ± 4. 8) × 10<jats:sup>−12</jats:sup> m s<jats:sup>−3</jats:sup>, respectively. The permeability for glycerol was slightly smaller than that for <jats:italic>meso</jats:italic>‐erythritol, whose molecular weight is larger than that of glycerol in this homologous series: but the reason for this is not clear.</jats:p>

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