Site fractions, calculating concentrations from

To check the validity of such a reaction scheme, the ratio between the concentration of the basic (na) and the acid sites (nA) was obtained from Figures 1-5. To evaluate the strength of the sites, the fraction of sites with a differential heat of adsorption higher than 80 kJ/mol (nA>8o/nA and nB>8o/na) was also calculated. Data are reported in Table 3. 

Thus, if iy[ provides a measure of the substrate concentration required for significant catalysis to occur. In fact, for many enzymes, experimental evidence suggests that if jyi provides an approximation of substrate concentration in vivo. When the if M is known, the fraction of sites filled,/gg, at any substrate concentration can be calculated from... 

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