CALCIUM UPTAKE BY RAT KIDNEY MITOCHONDRIA

t, 2 X 10-3. n2 Therefore the condition for convergence of the perturbation series is by no means fulfilled, and in order to get a valid approximation, one would have to solve the secular equation. which would lead to nonlocalized states. Further work in this direction is in progress. The above considerations hold also for more extensive systems. It seems possible that they can be applied to biological processes other than photosynthesis. For example, excitation processes in the retina could be mentioned. The light wave focused on one visual rod is coherent within the area of this rod. It s:ems probable that this collective character of the excitation is important for the formation of the signal in the adjoining nervous system. It also seems possible that collective activities play a role in the function of the central nervous system and relations may be found, say, between conscience and nonlocalized electronic states, or S and storage of memory. * This research was supported by grants from The Commonwealth Fund, the National Science Foundation (Grant B-10805) and The National Institutes of Health, (Grant H-2042, C5-7, BBC). t On leave from the National Bureau of Standards, Washington, D.C. 'Perrin, F., Ann. Chem. et Phys., 17, 283 (1932). 2 Fbrster, T., Ann. Phys., 2, 55 (1948); Radiation Res., suppl. 2, 326 (1960). 3 Frenkel, J., Phys. Rev., 37, 17, 1276 (1931). 4 See the review of M. Kasha, Revs. Mod. Phys., 31, 162 (1959). 'Emerson, R., and W. Arnold, J. Gen. Physiol., 15, 391 (1932); 16, 191 (1932). 6 Franck, J., and R. Livingston, Revs. Mod. Phys., 21, 505 (1949).