On the rate of water exchange across the surface of animal cells |
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| Affiliation: | 1. Laboratoire Matière et Systèmes Complexes, UMR 7057 CNRS & Université Paris Diderot, Sorbonne Paris Cité, 10 rue Alice Domon et Léonie Duquet, 75013, Paris, France;2. Laboratoire de Reproduction de développement des plantes, INRA, CNRS, ENS Lyon, UCB Lyon 1, Université de Lyon, 46 Allée d’Italie, 69364 Lyon, France;3. Laboratoire Joliot Curie, CNRS, ENS Lyon, Université de Lyon, 46 Allée d''Italie, 69364 Lyon, France;4. Institut des Sciences du Végétal, CNRS, Saclay Plant Sciences, bat 23 - Avenue de la Terrasse - 91198 Gif-sur-Yvette, France;1. Institute of Imaging Science, Vanderbilt University, Nashville, TN 37232, USA;2. Department of Radiology and Radiological Sciences, Vanderbilt University, Nashville, TN 37232, USA;3. Department of Radiology, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei, PR China;4. Department of Biomedical Engineering, Vanderbilt University, Nashville, TN 37232, USA;5. Department of Physics and Astronomy, Vanderbilt University, Nashville, TN 37232, USA;6. Department of Molecular Physiology and Biophysics, Vanderbilt University, Nashville, TN 37232, USA;7. Vanderbilt-Ingram Cancer Center, Vanderbilt University, Nashville, TN 37232, USA |
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| Abstract: | The two methods for determination of water permeability, the osmometric method, and the isotope exchange method are discussed, particularly with respect to the sources of error. In the latter method the exchange across the surface barrier is generally so fast that correction for the diffusion in the cytoplasm is required. The presence of cortical layers of considerable mechanical strength may often invalidate results obtained with the former method. In agreement with views advanced previously in the literature, it is concluded that the permeability coefficients obtained by the two different methods only under very special conditions are identical. However, the ratio cannot be expected to deviate much from unity, and it is shown that the large ratios reported in some cases do not represent the ratio between two permeability coefficients. |
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