. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FACTORS IN DEVELOPMENT OF FUCUS EGGS 131 bulb at 1 meter distance was turned on so that the eggs in half of the vessels were irradiated with white light from the opposite side. The white light was left on continuously until results were observed at 26 hours after fertilization. The response of Fucus eggs to unilateral irradiation with white light is to form the rhizoids on the sides of the eggs away from the light (Whitaker and Lowrance, 1936). The di- rectional demands of the ultraviolet and of the white light were therefor
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FACTORS IN DEVELOPMENT OF FUCUS EGGS 131 bulb at 1 meter distance was turned on so that the eggs in half of the vessels were irradiated with white light from the opposite side. The white light was left on continuously until results were observed at 26 hours after fertilization. The response of Fucus eggs to unilateral irradiation with white light is to form the rhizoids on the sides of the eggs away from the light (Whitaker and Lowrance, 1936). The di- rectional demands of the ultraviolet and of the white light were therefore PER CENT 100 r. DOSAGE FIG. 1. The vertical axis indicates the percentage of eggs in populations that formed rhizoids on the halves away from the source of radiation after unilateral irradiation with ^ 2537 A. The horizontal axis shows the dosage on a logarithmic scale. One unit of dosage represents approximately 1 erg per square millimeter (see text). opposed in these experiments, but the white light was left on much longer to dominate. The results are shown in Table I. It is clear that the white light reverses the direction of rhizoid formation so that rhizoids form on the surfaces of the eggs that were irradiated with ultraviolet. This appears to indicate that the unilateral ultraviolet does not determine the position of rhizoid formation merely by causing extreme destruction and in- capacitation of the irradiated surface of the egg. Some more specific effect is to be 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
