. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. LIGHT AND SLIME MOLDS 467 nomenon which might easily be caused by a chain reaction leading from light stimulation through acrasin production to altered cell movement, as outlined above. It should be carefully noted that we here used cyclic-AMP and acrasin interchangeably. In actual fact, of course, cyclic-AMP is the acrasin for only some of the Dictyostelium species but not for Polysphondylinm (Bonner et al. UJ o Q. c/) UJ cc. 40O 6OO WAVELENGTH 8OO EJ - - I ii 111 •• Tl — A. r. FIGURE 3. Comparison of action spect
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. LIGHT AND SLIME MOLDS 467 nomenon which might easily be caused by a chain reaction leading from light stimulation through acrasin production to altered cell movement, as outlined above. It should be carefully noted that we here used cyclic-AMP and acrasin interchangeably. In actual fact, of course, cyclic-AMP is the acrasin for only some of the Dictyostelium species but not for Polysphondylinm (Bonner et al. UJ o Q. c/) UJ cc. 40O 6OO WAVELENGTH 8OO EJ - - I ii 111 •• Tl — A. r. FIGURE 3. Comparison of action spectra (above) and absorption spectra (below) for three different species. For action spectra the units of response are different in each case. indicates phototaxis of D. discoidcnm and D. purpurciim (Francis, 1964). The response is the reciprocal of the amount of energy in ergs/cm2/sec necessary to produce a standard phototactic turn. indicates induction of aggregation in A. rosca (Reinhardt and Man- cinelli, 1968). The response is the number of centers per standard drop of amebae. Equal intensities were not used at all wavelengths, but the intensity at 450 m/x was weaker than the rest so that this peak is real. indicates induction of aggregation in P. pallidum. from Figure 2. For absorption spectra the boxes indicate the regions of absorption, bars indicate peaks in absorption. Abbreviations are , ethanol extract of carotenoids of D. discoidcnm (Staples and Gregg, 1967) ; , cell-free liquid from spore heads of D. purpurcum (Francis, 1964) ; , hexane solutions of several carotenoids of A. rosea (Fuller and Rakatansky, 1966).. 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
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