Table 1.
Characteristics of osmotic water transport in membrane vesicles purified from tobacco suspension cells
| Membrane fraction | Isolation procedure | Pf, μm·s−1 | Ea, kcal·mol−1 |
|---|---|---|---|
| PM-enriched | 2-PP | 7.6 ± 0.9 (5) | 13.4 ± 1.4 (2) (1)* |
| FFE | 6.1 ± 0.2 (6) | 13.7 ± 1.0 (4) (2)* | |
| TP-enriched | FFE | 690 ± 35 (7) | 2.5 ± 1.3 (3) |
Osmotic water permeability coefficients (Pf) at 20°C and Arrhenius activation energies (Ea) are indicated ±SEM with the number of independent membrane preparations in parentheses. 2-PP, two-phase partition.
*
Values in the second set of parentheses indicate the number of PM preparations with a nonlinear Arrhenius curve.