. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 170 M. A. McWHINNIE AND H. M. SWEENEY sentially the same rate and magnitude as had previously been attained by the chromatophores of isolated pieces of the carapace. With respect to duration, the concentrating factor appeared to have a slightly more lasting effect than did the dispersing factor. 4. Antagonistic action In sections 2 and 3 it was demonstrated that extracts of the sinus glands alone, or of the sinus glands, optic tracts and cerebral ganglia, induced only a dispersion of the red chromatophores of Cambarus while
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 170 M. A. McWHINNIE AND H. M. SWEENEY sentially the same rate and magnitude as had previously been attained by the chromatophores of isolated pieces of the carapace. With respect to duration, the concentrating factor appeared to have a slightly more lasting effect than did the dispersing factor. 4. Antagonistic action In sections 2 and 3 it was demonstrated that extracts of the sinus glands alone, or of the sinus glands, optic tracts and cerebral ganglia, induced only a dispersion of the red chromatophores of Cambarus while extracts of the connec- tives and thoracic cord induced a concentration of the same pigment. It was also shown that extracts of the entire nervous system (including the sinus glands) produced only a dispersing effect. The comparative dispersing action of the three types of extracts containing sinus glands, in a concentration of 5, is shown in Figure 7. These responses indicate that the concentrating factor in the nerve cord is prevented from eliciting a response when in the presence of high titers of the dispersing factor of the sinus gland. It is also apparent that the nervous X LJ cr O 1C Q. o O3 O cr 52. 0 15 30 45 60 75 90 105 120 135 TIME IN MINUTES FIGURE 9. Further demonstration of the mutual antagonism existing between two chro- matophorotropins of Trachelipus. A—dispersing factor alone (cone. 5). B—concentrating factor alone (cone. 5). C—concentrating and dispersing factor in a ratio of 4: 1. D—concen- trating and dispersing factor in a ratio of 3 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-; Redf
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