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Contributions from the Zoological Laboratory of the University of Pennsylvania (Volume 5)

Contributions from the Zoological Laboratory of the University of Pennsylvania (Volume 5)


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About the Book

This historic book may have numerous typos, missing text or index. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. 1899. Not illustrated. Excerpt: ... cell. The terms right and left are employed in the usual sense, i. e., right is clockwise, left is anti-clockwise. A cleavage is oblique to the right or, following Lillie ('95) dexiotropic, when the upper moiety lies to the right of the lower; it is oblique to the left, or leiotropic, when the upper moiety lies to the left of the lower." I. The Unscgmcnted Ovum (Fig. 1). The ovum I. magdalenensis varies in color from light pink to pinkish gray. It is perfectly spherical and measures exclusive of the chorion 0,4 mm in diameter. It is densely packed with a finely granular yolk that renders it perfectly opaque, making observations very difficult on the living egg. The protoplasmic portion at the animal pole is very slightly developed and is to be determined by sections only. The cleavage nucleus is slightly eccentric lying on the side toward the animal pole, and is characterized by a finely granular chromatin network suspended in a relatively abundant achromatic substance. This feature of the nucleus is the same for all cells during a considerable period of the ontogeny and often renders it difficult if not impossible to follow some of the phases of development of the entodermal cells, a difficulty that is not lessened by the abundance of yolk. Two polar bodies are formed and the chromatin of the first one occasionally redivides, though in no case have I seen the division affect the cytoplasm. The chromatin consists of densely aggregated irregular knots staining intensely, while the cytoplasm is perfectly transparent and is little if at all stained by logwood dyes. In stripping the chorion from these eggs the polar bodies are usually dislodged, although normally they persist a least until the 160 cell stage. Each egg is enclosed in a chorion bristling with many for...


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Product Details
  • ISBN-13: 9781154186659
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 168
  • Spine Width: 9 mm
  • Width: 189 mm
  • ISBN-10: 1154186652
  • Publisher Date: 15 Jan 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 313 gr


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