||Price PB, Sowers T. Temperature dependence of metabolic rates for microbial growth, maintenance, and survival. Proc Natl Acad Sci U S A. 2004 Mar 30 101(13):4631-6. p.4634 right column 6th paragraphPubMed ID15070769
||46. Phelps, T. J., Murphy, E. M., Pfiffner, S. M. & White, D. C. (1994) Microbiol. Ecol. 28, 335–349. AND 45. Chapelle FH, Lovley DR. Rates of microbial metabolism in deep coastal plain aquifers. Appl Environ Microbiol. 1990 Jun56(6):1865-74.PubMed ID16348227
||Both Phelps et al. (primary source 46) and Chapelle and Lovley (primary source 45) found
microbial concentrations to be a factor ~10^3 lower and specific
metabolic rates to be much lower in clayey sediments than in
sandy sediments. In clays, pore size is so small that microbes are
immobile and must depend on diffusion of gaseous or liquid
nutrients toward them.