. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ULTRA-VIOLET RADIATION AND CLEAVAGE 337 Experiments with Pure Light of \2537A To be certain that monochromatic light of X2537A is the effective agent, a number of experiments were tried with pure light of this wave- length obtained from the monochromator already described. The un- fertilized eggs were placed in a quartz cell and irradiated in the manner described in the previous paper (Giese and Leighton, 1935) usually for periods of 1, 4, 16, 64, 256 and 1,024 seconds. They were then trans- 3456 TIME SINCE INSEMINATION
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ULTRA-VIOLET RADIATION AND CLEAVAGE 337 Experiments with Pure Light of \2537A To be certain that monochromatic light of X2537A is the effective agent, a number of experiments were tried with pure light of this wave- length obtained from the monochromator already described. The un- fertilized eggs were placed in a quartz cell and irradiated in the manner described in the previous paper (Giese and Leighton, 1935) usually for periods of 1, 4, 16, 64, 256 and 1,024 seconds. They were then trans- 3456 TIME SINCE INSEMINATION (HOURS) 8 FIG. 3. Retardation of cleavage, X 2537A; intensity, A. Control. B. Sixty-four seconds exposure, extinction per egg: ergs or X 1011 quanta. C. Two hundred and fifty-six seconds exposure, extinction per egg: ergs or X 1012 quanta. D. One thousand and twenty-four seconds exposure, extinction per egg: ergs or X 1012 quanta. ferred to watchglasses, inseminated and observed at hourly intervals until they had reached the 64-celled stage and then at 12-hour intervals until the gastrula stage. Seven series of experiments, the last three covering only the longer exposures, gave similar results and one series is plotted in Fig. 3. It will be noted that retardation is evident when the dosage is. 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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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
