Process endergonic

Nevertheless the biosynthesis of glutamine proceeds from glutamic acid The dif ference is that the endergonic process m Equation 1 is coupled with the strongly exer gome hydrolysis of ATP... 

ENDERGONIC PROCESSES PROCEED BY COUPLING TO EXERGONIC PROCESSES... 

There have been many attempts to mimic some features of photosynthesis with abiotic systems for purposes of artificial solar energy conversion. Ideally a fuel, e.g., H2, is formed through a photosynthetic process. Photolysis of water is a highly endergonic process ... 

Everyday experience shows that water never flows uphill spontaneously. Whether a particular process can occur spontaneously or not depends on whether the potential difference between the final and the initial state, AP = P2 - Pi, is positive or negative. If P2 is smaller than Pi, then AP will be negative, and the process will take place and perform work. Processes of this type are called exergonic (Bl). If there is no potential difference, then the system is in equilibrium (B2). In the case of endergonic processes, AP is positive (B3). Processes of this type do not proceed spontaneously. 

STEREOCHEMICAL TERMINOLOGY, lUPAC RECOMMENDATIONS ENANTIOSELECTIVE REACTION ASYMMETRIC INDUCTION ENCOUNTER COMPLEX ENCOUNTER-CONTROLLED RATE DIFFUSION CONTROL FOR BIMOLECULAR COLLISIONS ENDERGONIC PROCESS ENDO-a (or j8)-N-ACETYLGALACTOSAMI-NIDASE... 

C. Multiple Displacement Reactions and the Coupling of ATP Cleavage to Endergonic Processes... 

These resonance stabilization energies of free radicals can be quite large, e.g. 50 kj mol 1 for benzyl-, and 70kjmol 1 for methyl-Np. These must be included in the overall energy balance of the reaction, and can make all the difference between a fast, highly exergonic process, and an endergonic process which in practice does no take place at all. 

We have seen instances in the various biochemical examples that we have cited of a close coupling between an exergonic and an endergonic process. The need for such couplings to account for the observed appearances of the products of endergonic processes (for example, the synthesis of complex biological molecules from simple ones) was recognized for some time before the details... 

We have observed that the processes of the same type may be perfomed by the same coupler and hence have similar scheme for the exergy transformation. Then suppose three endergonic processes of... 

Figure 14. Coupling of an endergonic process with a heat source or sink at T0. ...

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