Figure 4. Volume fraction of ordered nucleotides in the different environments and efficiency of producing ordered stacks.

(a) Total amount of nucleotides at a distance of 3.4 Å for clay, NH₄Cl, DMPC and film, as determined by the integrated area of the corresponding diffraction peaks. While clay produces a large number of ordered nucleotides for pure AMP and UMP, NH₄Cl is most productive in producing nucleotides at a distance of 3.4 Å for AMP/UMP mixtures. (b) The efficiency was calculated as the ratio between nucleotides at a 3.4 Å distance and nucleotides at a 4.6 Å distance. An efficiency less than 1 is indicative that more 4.6 Å nucleotides are produced while efficiencies of greater than 1 are indicative of more nucleotides at a distance of 3.4 Å. NH₄Cl was found to be most efficient in producing nucleotides at a distance of 3.4 Å. The bars indicate the experimental error.