Add to ORKGIn a preceding paper (1929) it was shown that fertilized fragments of the unfertilized Cha'topterus egg may segment exactly like whole eggs, at least as far as the 16-cell stage, and may develop into swimming dwarf larwe that are som@imes closely similar to the normal whole trochophores. The experiments here reported were undertaken in the hope of obtaining light on progressive localization in this egg prior to cleavage by comparing the behavior of fragments of fertilized eggs taken at successive intervals during the maturation-fertilization period, somewhat as was long ago undertaken in the case of the nemertine egg by Yatsu (1904, 1910) and by Zeleny (1904). In this respect the re sults of numerous experiments have been disappointing...
1. It is aimed in this paper to re-examine the fact about the polar bodies in the egg of Urechis tha...
The cleavage l)lalie of many cells has been deterniined by artificially imposed elongation. In gener...
1. In Phoronis australis, the eggs liberated out of the body cavity into the sea water have the capa...
Summary 1.Non-nucleated fragments of the egg fertilized by one spermatozoon may segment and such pie...
The mechanism that carries the maturation spindle to the surface of the egg has never been explained...
The study of isolated blastomeres has shown that they continue to divide as though still in contact ...
Observational part: 1. The ctenophore egg is composed of (a) the outer homogeneous layer, (b) ectopl...
During the first three cleavage divisions of the egg nuclei a precise sequence of spindle orientatio...
The formation of blastomeres by the newly fertilized egg has been studied by many authors, who have ...
The classical experiments of Pflüger on the segmenting frog's egg, and the important conclusions dra...
It has been shown in previous studies on sea urchin eggs (1936, 1938) that the non-nucleate fraction...
Uncleaved eggs of Limnaea stagnalis show a pattern of cytoplasmic differentiations in which there ar...
The eggs of Urechis that cleave and develop as a result of activation by dilute sea water have been ...
1. The maturation divisions of the egg of Limnaea stagnalis L. have been studied. 2. The haploid num...
The development of ascidian eggs has long been considered, as the result of the classical investigat...
1. It is aimed in this paper to re-examine the fact about the polar bodies in the egg of Urechis tha...
The cleavage l)lalie of many cells has been deterniined by artificially imposed elongation. In gener...
1. In Phoronis australis, the eggs liberated out of the body cavity into the sea water have the capa...
Summary 1.Non-nucleated fragments of the egg fertilized by one spermatozoon may segment and such pie...
The mechanism that carries the maturation spindle to the surface of the egg has never been explained...
The study of isolated blastomeres has shown that they continue to divide as though still in contact ...
Observational part: 1. The ctenophore egg is composed of (a) the outer homogeneous layer, (b) ectopl...
During the first three cleavage divisions of the egg nuclei a precise sequence of spindle orientatio...
The formation of blastomeres by the newly fertilized egg has been studied by many authors, who have ...
The classical experiments of Pflüger on the segmenting frog's egg, and the important conclusions dra...
It has been shown in previous studies on sea urchin eggs (1936, 1938) that the non-nucleate fraction...
Uncleaved eggs of Limnaea stagnalis show a pattern of cytoplasmic differentiations in which there ar...
The eggs of Urechis that cleave and develop as a result of activation by dilute sea water have been ...
1. The maturation divisions of the egg of Limnaea stagnalis L. have been studied. 2. The haploid num...
The development of ascidian eggs has long been considered, as the result of the classical investigat...
1. It is aimed in this paper to re-examine the fact about the polar bodies in the egg of Urechis tha...
The cleavage l)lalie of many cells has been deterniined by artificially imposed elongation. In gener...
1. In Phoronis australis, the eggs liberated out of the body cavity into the sea water have the capa...