Pseudoisomers thermodynamic reactions

This equation has the same form as equation 4.1-5, which applies to a chemical reaction described in terms of species. It shows why the world of biochemical thermodynamics at specified pH looks so much like the world of chemical thermodynamics that is described by equation 4.1-5. An important difference between these equations is that the terms in the summation on the right side of equation 4.1-30 deal with pseudoisomer groups, like ATP, rather than species. 

---