TABLE 1.

Solute permeabilities of S. cerevisiae membranes

Solute	Permeability (cm/s) ofa:
	Vacuoles	sec6 vesicles	sec6 vesicles (FPS1)
Water	(1.3 ± 0.9) × 10−3	(2.2 ± 0.4) × 10−3	(2.9 ± 0.5) × 10−3
Formamide	(1.8 ± 0.5) × 10−5	(3.3 ± 0.7) × 10−6	(3.4 ± 0.7) × 10−6
Urea	(1.2 ± 0.9) × 10−6	(2.5 ± 1.1) × 10−6	(2.0 ± 0.2) × 10−6
Glycerol	(1.3 ± 0.6) × 10−6	(1.1 ± 0.1) × 10−6	(1.7 ± 0.4) × 10−6

^aPermeabilities were calculated as described in references 7 and 14. All values are shown ± standard deviations.