The diffusional water permeability in the halotolerant alga Dunaliella as measured by nuclear magnetic resonance |
| |
Authors: | Hadassa Degani Mordhay Avron |
| |
Institution: | 1. Isotope Department, Weizmann Institute of Science, Rehovot Israel;2. Biochemistry Department, Weizmann Institute of Science, Rehovot Israel |
| |
Abstract: | T1 nuclear relaxation measurements of 1H and 17O of water have been applied to study the kinetics of the diffusional transport of water across the cytoplasmic cell membrane of Dunaliella salina and Dunaliella bardawil. The water permeability coefficients at 25°C were found to be 1.5·10−3 cm/s and 1.8·10−3 cm/s, respectively, with an activation energy of 3.7 kcal/mol. The results indicate that the cell membrane of Dunaliella exhibits high diffusional permeability to water, similar in magnitude to that found for other cells and model membranes, and a relatively low activation energy. This regularity is in contrast to the exceptionally low glycerol permeability of the membrane (Brown, F.F., Sussman, I., Avron, M. and Degani, H. (1982) Biochim. Biophys. Acta 690, 165–173). |
| |
Keywords: | Water permeability Alga NMR |
本文献已被 ScienceDirect 等数据库收录! |
|