36 SUBCELLULAR PARTICLES 



polycationic protein can also be eluted from the surface by m/i salt. At low salt con- 

 centrations the protein does not leave the surface but is loose enough to move from 

 one exchange site to another. The mobility on the surface is perhaps 60 per cent of that 

 in solution (Proc. Soil Sci. Soc. America, 1954). 



Dr. McElroy: Are there any examples where mechanism rather than rate might 

 be affected by the absorption of enzymes on surfaces? 



Dr. McLaren: None that I know of. See, however, Dr. Siegel's paper on the poly- 

 merization of eugenol (this volume, p. 37). 



Dr. Paigen: Can you give an approximate value of the double layer of a biological 

 membrane at an ionic strength equivalent to isotonic salt? 



Dr. McLaren: Such values may be found in the manuscript. 



