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First published online January 5, 2005
Journal of Experimental Biology 208, 371-381 (2005)
Published by The Company of Biologists 2005
doi: 10.1242/jeb.01377
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An allometric comparison of microsomal membrane lipid composition and sodium pump molecular activity in the brain of mammals and birds

Nigel Turner1,*, Paul L. Else1 and A. J. Hulbert2

1 Metabolic Research Centre, Department of Biomedical Science, University of Wollongong, Wollongong, NSW 2522, Australia
2 Department of Biological Science, University of Wollongong, Wollongong, NSW 2522, Australia



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  		Fig. 1. Allometric relationship between body mass and Na+, K+-ATPase activity of brain homogenates in mammals and birds. Values are means ± S.E.M. of Na+, K+-ATPase measurements at 37°C in mammals and corrected to 37°C in birds (see Materials and methods). Data from Tables 1 and 2. The lines are the best power fits to the data as described by the inset equations. Pi, inorganic phosphate.

 


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  		Fig. 2. Allometric relationship between body mass and brain sodium pump density in mammals and birds. Values are means ± S.E.M. Data from Tables 1 and 2. The lines are the best power fits to the data as described by the inset equations.

 


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  		Fig. 3. Allometric relationship between body mass and sodium pump molecular activity in the brain of mammals and birds. Values are means ± S.E.M. Molecular activity values were calculated by dividing maximal Na+, K+-ATPase activity at 37°C by the sodium pump density for the same animal. Data from Tables 1 and 2. The lines are best power fits to the data as described by the inset equations.

 

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© The Company of Biologists Ltd 2005