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Influence of acclimatization temperature and salinity on adenosine triphosphatase and fatty acid composition in the gills of the eel, (Anguilla anguilla)
Thomson, A.J.; Sargent, J.R.; Owen, J.M. (1977). Influence of acclimatization temperature and salinity on adenosine triphosphatase and fatty acid composition in the gills of the eel, (Anguilla anguilla). Comp. Biochem. Physiol., B Comp. Biochem. 56(3): 223-228. https://dx.doi.org/10.1016/0305-0491(77)90004-9
In: Comparative Biochemistry and Physiology. B. Comparative Biochemistry. Pergamon Press: London; Oxford; New York; Paris. ISSN 0305-0491
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| Auteurs | | Top |
- Thomson, A.J.
- Sargent, J.R.
- Owen, J.M.
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| Abstract |
1. Microsomal Na/K-ATPase from the gills of natural freshwater eels had an Arrhenius plot discontinuity at 20°C. The corresponding enzyme from natural seawater eels had a discontinuity at 12°C. Fatty acids from total lipids of the gills of freshwater and seawater eels were rich in (n-6) and (n-3) fatty acids respectively.2. Natural freshwater eels adapted to seawater for 3 months without a temperature change had an unchanged Arrhenius plot discontinuity and an unchanged fatty acid composition. The situation was unchanged after a further 3 months in sea water at low temperature.3. Natural seawater eels adapted to a higher temperature in sea water for 3 months yielded an Arrhenius plot discontinuity at 20°C and their gills fatty acids were now more saturated. These changes were reversed by re-adapting the eels for a further 3 months in sea water at a lower temperature.4. It is concluded that temperature and not salinity determines the degree of unsaturation of gill lipids. The position of discontinuity in the Arrhenius plot of a biomembrane enzyme can be correlated with the degree of unsaturation of membrane lipids under natural conditions reflecting the fluidity of the biomembrane. The (n-3) and not the (n-6) polyunsaturated fatty acids yield fluid biomembranes at low temperatures. |
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