. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CLEAVAGE-ACTIVATION RELATION 63 the curves would not coincide; but their divergence is no greater than would be expected when one considers the statistical nature of the activation values and the errors involved in the volume measurements. Moreover, there are probably injury factors operative in the lower concentrations of sea water that are not present in the higher concen- trations, as indicated by the cytolysis obtained in 45 per cent sea water. FERTILIZATION OF "OVER-EXPOSED" EGGS The activation-time curves for
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CLEAVAGE-ACTIVATION RELATION 63 the curves would not coincide; but their divergence is no greater than would be expected when one considers the statistical nature of the activation values and the errors involved in the volume measurements. Moreover, there are probably injury factors operative in the lower concentrations of sea water that are not present in the higher concen- trations, as indicated by the cytolysis obtained in 45 per cent sea water. FERTILIZATION OF "OVER-EXPOSED" EGGS The activation-time curves for concentrations of sea water above 40 per cent are seen to rise to a maximum of about 100 per cent activation and then drop off to zero. 100 90 80 It 60 2 &50 1 i o -2 <t o I «£ 30 20 80%. QlOOCXX Minutes age FIG. 8. Variation of percentage activation (open circles) and percentage cleav- (solid circles) with time of exposure to 70 per cent sea water. Data of Table XII. The eggs which do not respond before the "optimum exposure" is reached may be termed "under-exposed" unactivated eggs, and those which do not respond upon longer exposures may be termed "over-exposed" unactivated eggs. The failure of the "over-exposed" unactivated eggs to respond to the treatment might presumably be due to an injury effect, or other change produced in the eggs. The "over-exposed" unactivated eggs as well as the under-exposed unactivated eggs were therefore insemi- nated with fresh sperm in order to determine whether they would become fertilized and produce normal embryos. The results obtained. 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;
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
