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On the Cytology of the Vegetative and Reproductive Organs of the Saprolegnieae

On the Cytology of the Vegetative and Reproductive Organs of the Saprolegnieae


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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. 1896. Excerpt: ... to the centre and open into the central vacuole, which enlarges in this way until the protoplasm is reduced to a thick peripheral layer. As these vacuoles have often the size of nuclei, and are inconspicuous in balsam specimens, I erroneously interpreted them as being nuclei in my note in the Comptes-rendus, an error which I corrected in the margin when distributing the "tirages a part," immediately after publication. The nuclei lie evenly distributed between the vacuoles at first (PI. XXIX., fig. 33); but, as the intervening protoplasm is gradually reduced, they are brought closer together, often in files or lines (PI. XXIX., figs. 29, 30, 36, 37, 38). The chromatin of the nucleus is reduced and its hyaloplasm becomes very pale, while the nuclear wall, though seen in crushed specimens, is now undistinguishable in colour from the surrounding protoplasm of the uninjured oangium. Hence the study of the nuclei and their behaviour at this period becomes enormously difficult; and it is only possible under the best possible conditions of preservation staining and microscopic apparatus. As the narrowing of the protoplasm goes on, the number of the nuclei is reduced; their size is no longer uniform; they are often seen approximated in pairs of even or uneven size; they contain more than one chromatin granule--from 4 to 20, the number being usually greater as the stage is more advanced. The only interpretation I can place on these facts is that the nuclei fuse when they approximate; and that the nuclein masses, though reduced in size, long retain their individuality in the compound nuclei so formed.f It might be conjectured that the multiple nuclein granules point to karyokinesis, and so they do in the etymological sense of 'nuclear disturbance, ' but the reduction...


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Product Details
  • ISBN-13: 9781235743030
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 26
  • Spine Width: 1 mm
  • Width: 189 mm
  • ISBN-10: 1235743039
  • Publisher Date: 01 Feb 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 68 gr

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