Figure 2.

Stopped-flow light scattering measurement of osmotic water permeability in alveolar epithelial cells isolated from lung. Measurements were made at a 300-mOsm initial osmolality at 10°C as described in Methods. Representative data from one of three experiments are shown for purified type I cell preparations (top curves) and purified type II cells (bottom curve) with indicated final osmolalities. The same time scale was used for type I and type II cells to show the much slower water transport in type II cells.