Permeability of WholeDunaliella Cellsto Glucose

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Abstract
Ginzburg, M. and Richman, L. 1985. Permeability of whole Dunaliella cells to glucose.—J. exp. Bot. 36: 1959–1968.When glucose was dissolved in medium in which Dunaliella cells were suspended, the amount recovered from pellets of centrifuged cells was greater than that expected if the glucose had been restricted to intercellular space, as measured with Blue Dextran. Glucose is not metabolized by whole Dunaliella cells. The glucose additional to that in the intercellular space must be either adsorbed in the coating outside the cells or must penetrate the cell through the cell membrane. Grounds are given for suggesting that the latter hypothesis is correct and that the glucose comes to equilibrium with a space within the cell (the glucose–space) equivalent to 20–40% of the cell–water. It is suggested that most of the cell Na+ is restricted to the glucose-space.

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