The nuclear magnetic resonance (NMR) signal from the water in the gill filaments of the eel is broad in comparison with the signals obtained from tap water or from sea water. This suggests a binding of a fraction of cellular water to branchial constitutuents. The cellular water is present in at least two phases which differ by the degree of interaction between water and gill macro-molecules.
Measurements of water exchanges either by an isotopic technique or by NMR give similar results. Measurements made after the destruction of the cells show that structured water exchanges are not the limiting factor in transbranchial diffusional fluxes.
The high activation energy required to transfer water molecules across the gill epithelium seems to indicate a highly structured diffusional medium.
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Isaia, J., Isaia, A. Measurements of water exchanges in the eel gill compared by nuclear magnetic resonance and isotopic techniques. J Comp Physiol B 124, 137–142 (1978). https://doi.org/10.1007/BF00689174
- Activation Energy
- Water Molecule
- Nuclear Magnetic Resonance
- High Activation
- Human Physiology