Allometric Scaling of Metabolic Rate and Complexity

This reverses the selection pressures on bacteria whereas bacteria are oppressed by heavy selection pressure to lose genes, eukaryotes are under pressure to gain them. 

Allen JF (1993) Control of gene expression by redox potential ad the requirement for chloro-plast and mitochondrial genes. J Theor Biol 165 609-631 

Allen JF (2003) The function of genomes in bioenergetic organelles. Philos Trans R Soc Lond B Biol Sci 358 19-38 

Allen JF, Raven JA (1996) Free-radical-induced mutation vs redox regulation costs and benefits of genes in organelles. J Mol Evol 42 482-492 

Amaral Zettler LA, Gomez F, Zettler E, Keenan BG, Amils R, Sogin ML (2002) Eukaryotic diversity in Spain s River of Fire. Nature 417 137 

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