Contributions to Embryology Volume N . 8

Contributions to Embryology Volume N . 8

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1918 edition. Excerpt: ...(1) that isolated epidermal fibrils are generally of finer diameter than the chondriokonts; (2) that the division of other fibrillar formations such as myofibrils and neurofibrils is admitted by most authors. Duesberg's observations on the epidermis of the tadpole lead him to the same conclusion that the epidermal fibrils arise by the transformation of mitochondria (1912, p. 796). Since the iron-hematoxylin method and the Benda method color the mitochondria and the completely formed fibrils (two very different structures microchemically) alike, these methods of technique can not be regarded as suitable for an investigation of this nature. More specific methods must of necessity be employed. It follows that Firket, in his series showing a parallelism between the disappearance of mitochondria and the formation of fibrils, has had to rely solely upon the diameter of the filaments to determine whether they are mitochondria or differentiated fibrils. His position is therefore insecure, since he can not distinguish with certainty the structures between which he claims to show transitions. If we admit that this parallelism does exist, we find that it is capable of a similar explanation to that advanced in the discussion of collagenic fibrils and myofibrils, namely, that the amount of mitochondria is cUminished because the activity of the cells is lessened in the later stages of cytomorphosis. The problem is rendered more difficult and deceiving because of the superficial resemblance which obtains between the staining reactions of the mitochondria and of the fibrils. Some of the fundamental differences which are said to exist between them may be indicated: Mitochondria. Fibrils. 1. Granules, rods, filaments. Long threads of finer diameter...
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Product details

  • Paperback | 112 pages
  • 189 x 246 x 6mm | 213g
  • United States
  • English
  • black & white illustrations
  • 1236859510
  • 9781236859518