. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ANALYSIS OF NHl'KAL TU'.K FORMATION 87 sorption maxima at wave lengths 2576 and 2804 A and a minimum at wave lengths 2650-2700 A. The validity of using a morphological endpoint as a measure of the effect produced is shown hy the fact that the curves for the two different morpho- logical endpoints are almost identical in shape. Furthermore, the curves are very similar in shape regardless of the data used in correction for ahsorption by the vitelline membrane. This shows that the differences in effectiveness of different wave
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ANALYSIS OF NHl'KAL TU'.K FORMATION 87 sorption maxima at wave lengths 2576 and 2804 A and a minimum at wave lengths 2650-2700 A. The validity of using a morphological endpoint as a measure of the effect produced is shown hy the fact that the curves for the two different morpho- logical endpoints are almost identical in shape. Furthermore, the curves are very similar in shape regardless of the data used in correction for ahsorption by the vitelline membrane. This shows that the differences in effectiveness of different wave lengths as shown in the photochemical efficiency curves are truly significant. 0 14 013 012 on 010 009 <M I tr LJ °-007 10 \ tf \o:006 005 004 002 001. 2400 250O 2600 2700 2800 2900 3000 WAVE LENGTH IN ANGSTROM UNITS -U- 3100 2. Photochemical efficiency curve. Inhibition of of the neural tube for a distance of at least one-third its length in 50 per cent of the embryos. Correction for extinction by vitelline membrane based upon transmission measurements with Hiker spectrograph. (O) and ( X ) are symbols for experimentally determined doses stronger and weaker respectively than the calculated end-point doses (A). DISCUSSION Histological studies were made in order to determine whether a comparable unit of ultraviolet effect on the folding process was obtained at all effective wave lengths. Observations of the embryos irradiated with the amounts of energy neces- sary to produce the two morphological endpoints. namely, failure of the neural tube to close for distances of one-third and one-half its length in 50 per cent of the cases,. 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. ). An
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