. Bacterial photosynthesis. Bacteria -- Physiology; Photosynthesis. VISCOSITY AND REACTION RATES IN BACTERIA 363 • Chromatium Glycerol (67%) 410 420 X(m/A) 430 Fig. 4. The effect of glycerol upon the difference spectrum for cytochrome oxidation in Chromatium. {MN-16). presence of glycerol than in its absence. Lastly, a consistent inhibition of the rate of the light-off reaction is observed. An examination of the difference spectrum for the light effect in the presence of glycerol shows the peak to be somewhat intensified and shifted toward shorter wavelengths (Fig, 4). The maxi
. Bacterial photosynthesis. Bacteria -- Physiology; Photosynthesis. VISCOSITY AND REACTION RATES IN BACTERIA 363 • Chromatium Glycerol (67%) 410 420 X(m/A) 430 Fig. 4. The effect of glycerol upon the difference spectrum for cytochrome oxidation in Chromatium. {MN-16). presence of glycerol than in its absence. Lastly, a consistent inhibition of the rate of the light-off reaction is observed. An examination of the difference spectrum for the light effect in the presence of glycerol shows the peak to be somewhat intensified and shifted toward shorter wavelengths (Fig, 4). The maximum is approxi- mately 422 m^, the wavelength employed in Fig. 3. Rho do spirillum rubnim. A series of experiments illustrated in Fig. 5 indicate the effect of the aerobic-anaerobic transitions in R. rubrum (A), followed by illumi- nation of the cells. The illumination interval is plotted on an enlarged scale in B; it is seen that the light reaction can readily be measured from the slopes of the traces. The effect of 40 per cent glycerol is indicated in Record C. First, it is seen that the respiratory activity is much slower, as evidenced by the prolonged interval required to reach the anaerobic steady state. Illumination gives approximately the same percentage change of steady states. In the enlarged view (D), one sees that the light-on reaction proceeds very rapidly in spite of the presence of 40 per cent glycerol but that the light-off reaction is con- siderably slowed. Thus, we see characteristics in R. rubrum similar to those in Chromatium and, on this basis, our data are consistent with the possibility that the cytochrome-bacteriochlorophyll electron transfer reaction in R. rubrum is of a similar mechanism to that of Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Symposium on Bacterial
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