Short notation for the thermokinetic rate equations

The linear approximation such as given by Eqn. 22 could be summarized in either of two ways  

In the kinetic example used here, the expression of U and into the kinetic constants is  

Only for certain kinetic constants, and sum concentration of substrate plus product, Pg = Pp and AG become zero, so that the flow-force relationship of Eqn. 20 which was used in near-equilibrium non-equilibrium thermodynamics [1,3-5,8], becomes valid. It should be noted that only at low magnitudes of [S] -I- [P] does the condition AG = 0 coincide with = 1. 

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