. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CENTRAL BODIES IN ECHINARACHNIUS EGGS. 117 •"• [. Z5 PHflSE TELOPHRSE Ihy Iky. 30mm.± OF ECHINRRflCHNIUS EGGS [BOUIN'5 FICTION] LRTE Ihr. 30 TO,..* when rays are coarse. It appears and disappears as heavy well-formed rays appear and disappear. It enlarges and changes shape as the aster enlarges and changes shape. It is a coagulation artifact of ray sub- stance at the astral center produced only when rays are coarse. For discussion see pp. 115 and 118. when rays are delicate. They appear and disappear as coarse r
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CENTRAL BODIES IN ECHINARACHNIUS EGGS. 117 •"• [. Z5 PHflSE TELOPHRSE Ihy Iky. 30mm.± OF ECHINRRflCHNIUS EGGS [BOUIN'5 FICTION] LRTE Ihr. 30 TO,..* when rays are coarse. It appears and disappears as heavy well-formed rays appear and disappear. It enlarges and changes shape as the aster enlarges and changes shape. It is a coagulation artifact of ray sub- stance at the astral center produced only when rays are coarse. For discussion see pp. 115 and 118. when rays are delicate. They appear and disappear as coarse rays appear and disappear. This suggests the conclusion that the cen- tral bodies of cleavage-asters, as in the case of sperm-asters, are not individualized entities, but are nothing but a coagulation prod- uct of heavy rays at the inner ends where they converge. In about five hundred cleavage-asters studied in the detailed manner previously described, there were found no exceptions to the correlation between the presence of coarse rays and the oc- currence of a central body. This is strikingly shown in comparing early metaphase asters with late ones (Figs. 21 and 22). They are similar as to size; in both, the chromosomes are at the mid- point of the spindle; they differ only in the fact that the earlier stage has delicate rays and the later one has coarse rays. The former has no central body; the latter has a'fully-formed central body. In over a hundred and fifty such metaphase asters studied,. 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 Biologica
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
