. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. COLCHICINE AND CLEAVAGE IN ARBACIA 191 of development in Arbacia eggs even though they have all been taken from a single female. Furthermore, eggs taken from females at differ- ent months of the season were found to have different developmental tempos. Temperature is also a very important factor in the speed at which these eggs divide. 100 90 80 70 60 50 LJ o < 40 LJ _l U LJ O UJ U 30 20 I 0 HMH¥H*. 24 28 36 0 4 8 12 I 6 20 MINUTES AFTER FERTILIZATION TIME OF TREATMENT WITH COLCHICINE FIG. 2. A graph showing suppression o
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. COLCHICINE AND CLEAVAGE IN ARBACIA 191 of development in Arbacia eggs even though they have all been taken from a single female. Furthermore, eggs taken from females at differ- ent months of the season were found to have different developmental tempos. Temperature is also a very important factor in the speed at which these eggs divide. 100 90 80 70 60 50 LJ o < 40 LJ _l U LJ O UJ U 30 20 I 0 HMH¥H*. 24 28 36 0 4 8 12 I 6 20 MINUTES AFTER FERTILIZATION TIME OF TREATMENT WITH COLCHICINE FIG. 2. A graph showing suppression of cleavage by colchicine. The results of three experiments are indicated by the curves. Note complete suppression until 22 minutes after fertilization. After this time the eggs rapidly became more resistant to the colchicine. Dividing eggs that had been treated with colchicine were examined with a water immersion lens. The chief effect of the colchicine that could be detected by this method of study was upon the asters. As the colchicine penetrated the egg a gradual fading out of the astral rays occurred until eventually there appeared at each pole a clear. 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
