Biological scaling and physics.
Kleiber's law in biology states that the specific metabolic rate (metabolic rate per unit mass) scales as M- 1/4 in terms of the mass M of the organism. A long-standing puzzle is the (- 1/4) power in place of the usual expectation of (- 1/3) based on the surface to volume ratio in three-dimensions. While recent papers by physicists have focused exclusively on geometry in attempting to explain the puzzle, we consider here a specific law of physics that governs fluid flow to show how the (- 1/4) power arises under certain conditions. More generally, such a line of approach that identifies a specific physical law as involved and then examines the implications of a power law may illuminate better the role of physics in biology.
Rau
A R P
AR
Department of Physics and Astronomy, Louisiana State University, Baton Rouge 70803, USA. arau@phys.lsu.edu
D055592:Biophysical Phenomena; D001703:Biophysics; D008962:Models, Theoretical