SUMMARY: In the study of biological systems kinetic problems arise which are not significant in the kinetic systems of interest to physical chemists. One of these biological problems is the influence of correlated fluctuations in molecular properties on the macroscopic variables of the cell. It is demonstrated that, for an ensemble consisting of systems each of which includes two chemical compounds, there is a definite effect which originates in correlated fluctuations and is reflected in a broadened distribution of the concentration of chemical constituents. It is shown that a periodically varying temperature narrows this distribution. The narrowing is a function of the frequency at which the temperature is varying.


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