. Bacterial photosynthesis. Bacteria -- Physiology; Photosynthesis. 436 PHOTOMECHANICAL CONSIDERATIONS difference between the "cytochrome response" and the "carotenoid re- sponse" is clearly demonstrated. The steady-state carotenoid shifts (solid curve) plotted versus logarithm of intensity fit the symmetrical sigmoid curve for a rectangular hyberbola, whereas the steady-state cytochrome change (dashed curve) shows four inflections suggesting separate electron transfer systems having distinctly different sensi- tivities to light. The two inflection points for the most sensi
. Bacterial photosynthesis. Bacteria -- Physiology; Photosynthesis. 436 PHOTOMECHANICAL CONSIDERATIONS difference between the "cytochrome response" and the "carotenoid re- sponse" is clearly demonstrated. The steady-state carotenoid shifts (solid curve) plotted versus logarithm of intensity fit the symmetrical sigmoid curve for a rectangular hyberbola, whereas the steady-state cytochrome change (dashed curve) shows four inflections suggesting separate electron transfer systems having distinctly different sensi- tivities to light. The two inflection points for the most sensitive cyto- chrome reactions occur at intensities well below the inflection point for the carotenoid reaction and are consistent with the observation in Fig, 1 that the light-induced carotenoid changes disappear before the light-induced cytochrome 2 3 4 5 INTENSITY IN lO'" EINSTEIN cm'^SEC"' Fig. 3, Initial rate of absorbancy decrease at cytochrome Soret peak versus quantum intensity of actinic light { jU). Anaerobic bacteria suspended in M 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 Photosynthesis (1963 : Yellow Springs, Ohio); Charles F. Kettering Research Laboratory (Yellow Springs, Ohio); Gest, Howard. Yellow Springs, Ohio, Antioch Press
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