2. THERMODYNAMICS OF LIVING SYSTEMS
73
centration, etc. In order to arrive at a value of AV, it is desirable to
raise the temperature to some point well above the normal optimum,
where K x is large compared with 1. Here intensity of luminescence is
modified by the influence of pressure on both AV
X and AV, and measurements of the relation between luminescence intensity and pressure yield
the difference of these constants. As a rule, it might be expected that
AV* will be smaller than AV, just as the energy and entropy of activation of the enzyme-catalyzed rate process are likely to be much smaller
than the heat and entropy of reaction for the reversible denaturation of
the protein. For this reason, the process as a whole may be expected to
have an optimal pressure, as well as an optimal temperature.
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