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The Ovarian Egg of Limulus; A Contribution to the Problem of the Centrosome and Yolk-Nucleus

The Ovarian Egg of Limulus; A Contribution to the Problem of the Centrosome and Yolk-Nucleus


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About the Book

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated.1899 Excerpt: ... egg of the frog. He was unable to state whether this was accompanied by a division of the nucleus. Balbiani ('93) found that the ovarian eggs of spiders also degenerate; and he figures follicles filled with cells. I am unable to make any positive statements in regard to the immediate causes of metamorphosis. I believe, however, that the following statement can be made: the cause of the disturbance lies in the egg itself. In the present case there is no true follicle epithelium surrounding the egg. The cells of the stalk, which correspond to the follicle epithelium in other eggs, and which appear to have a similar relation to the egg so far as the function of nutrition is concerned, seem perfectly normaI. They often appear to be unusually active and evidently enter the egg at the proximal pole (PI. XIV, Fig. 31). The conditions which make this possible, as it seems to me, lie in the egg itself, and not in an abnormal condition of the follicle cells, as has been supposed by Flemming ("95) in the case of other eggs. The Germinal Vesicle. A network can be distinguished quite early in the germinal vesicle, and the stainable substance, losing more and more its definite form, becomes distributed in irregular granules over this network, and also between the meshes, being especially abundant at the nodes. The stainable substance tends to become massed at the periphery, and especially at one point, where the nucleolus early makes its appearance. As the nucleolus increases in size, the remainder of the germinal vesicle loses more and more its power of staining deeply in carmine and haematoxylin, and is no longer capable of being differentiated, as ordinary nuclei are, by means of the green of the Biondi-Ehrlich triple stain. During the first stage of the egg the germi...


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Product Details
  • ISBN-13: 9780217961677
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 38
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 0217961673
  • Publisher Date: 08 Feb 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 86 gr


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