. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 162 W. G. HAND, R. FORWARD AND D. DAVENPORT If one compares the maximum response level attained at each stimulus intensity in darkness (Fig. 5) with similar data obtained in red light (Fig. 9), one sees a decline in the maximum response level in the former. This difference may be attributable to the fact that under the former condition the blue-absorbing photo- pigment is rapidly bleached by successive stimulation and in the absence of red 70 o 50- m CO 30- co m 10-. 0 TIME MINUTES FIGURE 9. The relation of stimulus intensit
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 162 W. G. HAND, R. FORWARD AND D. DAVENPORT If one compares the maximum response level attained at each stimulus intensity in darkness (Fig. 5) with similar data obtained in red light (Fig. 9), one sees a decline in the maximum response level in the former. This difference may be attributable to the fact that under the former condition the blue-absorbing photo- pigment is rapidly bleached by successive stimulation and in the absence of red 70 o 50- m CO 30- co m 10-. 0 TIME MINUTES FIGURE 9. The relation of stimulus intensity to stop-response magnitude when light- adapted cells are placed in red light (600-700 m/u. at 300 ). The points represent the return to maximum response shown by 100 cells, when these cells are stimulated at different intensities. The numbers represent the different stimulus intensities as given in Figure 5 with two additions: 6 = 77 , 7 = 66 light cannot be reconstituted rapidly enough to maintain a high response level. In the latter, red light is present, and as has already been demonstrated, the presence of such light allows for regeneration of the blue-absorbing pigment at a rate faster than the sucessive stimuli can degrade it. DISCUSSION On the basis of what is known about photoreception in animals, what can be said concerning the findings presented here? In the animal system, a pigment,. 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 Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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