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"Non-shivering thermogenesis"?

 Dear all,

Im a little confused with respect to the ways poikilothermic endothermic 
homeotherms utilize in creating their internal heat. Once I read that their 
bodily heat is just a useful by-product of their fast metabolism (all the 
energy they release in their cells is eventually converted to heat, as the 
second rule of thermodynamics predicts).

But some texts have perplexed me. For example, in his book _The Dinosaur 
Heresies_, Robert Bakker seems to treat the processes used to create internal 
heat as completely independent of those leading to the lively and jumping 
existence of birds and mammals.

He speaks of "non-shivering thermogenesis". I was just entertaining myself with 
Bakker's letter "Dinosaur Bioenergtics - a reply to Bennett and Danzell, and 
Feduccia" from year 1974 in the volume 28 of Evolution, pages 497-503. In his 
letter, Bakker states that NSTG has something to do with the activity of sodium 
pumps of the cell membranes. He refers to a paper to which I - surprisingly - 
don't have access to. I'd be grateful if someone could clear up this mess of 
mine a little.


Henri Rönkkö
Soittoäänet ja ikonit matkapuhelimeen!  http://www.iobox.fi/