Structure and surface energy of the surfactant layer on the alveolar surface: inaccuracies and their correction.

The article of Kashchiev and Exerowa (Eur Biophys J 30:34-41) is shown to incorporate a number of inaccuracies that fit the categories "historical", "anatomical", and "biophysical". These inaccuracies are corrected by reference to published research reports from 1978 to 1998. The monolayer-bilayer model proposed by Kashchiev and Exerowa may be thermodynamically correct in vitro, but has not been related to the structure of the alveolar surface in vivo, which is that of a foam ("the alveolar surface network").