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Table 1.

Mean (± s.e.m.) proton leak rates at a membrane potential of 160 mV at 20°C and mean (± s.e.m.) mitochondrial densities in red muscle and liver of three shark species

Tissue and speciesProton leak rate (nmol H+ min−1mg−1 protein)Mitochondrial density [Vv(mt,f) or volume %]
Red myotomal muscle   
Isurus oxyrinchus (shortfin mako shark) 20.0±4.0 40.8±1.3 (3; 9) 
Prionace glauca (blue shark) 23.5±2.4 * 23.2±1.0 (2; 10) 
Triakis semifasciata (leopard shark) 26.9±2.3 39.5±1.5 (1; 10) 
Liver   
Isurus oxyrinchus (shortfin mako shark) 18.6±4.3 20.6±0.7 (2; 32) 
Prionace glauca (blue shark) 8.7±1.3 22.9±1.0 (1; 21) 
Triakis semifasciata (leopard shark) 15.6±2.9 12.7±0.9 (2; 23) 
Tissue and speciesProton leak rate (nmol H+ min−1mg−1 protein)Mitochondrial density [Vv(mt,f) or volume %]
Red myotomal muscle   
Isurus oxyrinchus (shortfin mako shark) 20.0±4.0 40.8±1.3 (3; 9) 
Prionace glauca (blue shark) 23.5±2.4 * 23.2±1.0 (2; 10) 
Triakis semifasciata (leopard shark) 26.9±2.3 39.5±1.5 (1; 10) 
Liver   
Isurus oxyrinchus (shortfin mako shark) 18.6±4.3 20.6±0.7 (2; 32) 
Prionace glauca (blue shark) 8.7±1.3 22.9±1.0 (1; 21) 
Triakis semifasciata (leopard shark) 15.6±2.9 12.7±0.9 (2; 23) 

For mitochondrial density measurements, the number of individual sharks sampled, followed by the number of TEM images analyzed, is indicated in parentheses.

*

Mean is significantly higher than liver mean for that species (paired t-test, P=0.02).

Mean differs significantly from those of the other two species (ANOVA, P<0.01).

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