. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 254 ALEXANDER HOLLAENDER only eggs which showed at least the two-cell stages were called acti- vated. This took usually three to five hours at room temperature. Many of the activated eggs went to further stages of development. Sixteen and 32-cell stages were observed, but some of the eggs cytolyzed after two or three divisions. It was necessary to limit this part of the investigation to the observation of divisions which gave the most reliable counts, , the two-cell stage. I00r 80 z o I H U H Z u o cr 60 40 20 2260 A. 28
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 254 ALEXANDER HOLLAENDER only eggs which showed at least the two-cell stages were called acti- vated. This took usually three to five hours at room temperature. Many of the activated eggs went to further stages of development. Sixteen and 32-cell stages were observed, but some of the eggs cytolyzed after two or three divisions. It was necessary to limit this part of the investigation to the observation of divisions which gave the most reliable counts, , the two-cell stage. I00r 80 z o I H U H Z u o cr 60 40 20 2260 A. 2805 A LOG INCIDENT ENERGY IN ERGS PER ORGANISM ^ FIG. 3. Graphs showing percentage of the unfertilized eggs activated by monochromatic ultra-violet radiation against the log of the incident energy at five wave-lengths. Figure 4 illustrates graphically the effectivity of the different wave- lengths in producing activation of Arbacia eggs, taking the energy necessary at 2260 A as 100. The absorption spectrum of an egg of Paracentrotus lividus as determined by Vies and Gex (1927) is given. Also, the inactivation spectrum of the virus of typical tobacco mosaic. 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
Size: 1623px × 1539px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
