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生物 > 清华大学：《生物化学》课程PPT教学课件（英文版）One difficulty in using entropy
清华大学：《生物化学》课程PPT教学课件（英文版）One difficulty in using entropy
process can occur spontaneously is that the entropy changes of chemical reactions are not readily measured. Furthermore, the criterion of sponta- neity given in equation 2 requires that both the entropy change of the surroundings and that of the system of interest be known. These difficul- ties are obviated by using different thermodynar function called the free energy, which is denoted by the symbol G (or F, in the older literature).
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Enzymes accelerate reactions b py decreasing ag. the activation barrier. The combination of substrate and enzyme creates a new reaction pathway whose transition state energy is lower than that of the reaction in the absence of enzyme(Figure 8-7). The essence of catalysis is specific binding of the transition state, to be discussed later in this chapter and the next
Transition state Substrate Pro Progress of reaction Transition state △G Substrate Product Progress of reaction Figure 8-7 Enzymes accelerate reactions b reasing AG, the free energy of acti vation. The free-energy profiles of uncatalyzed(A)and catalyzed(B) reactions are compared
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