Contributions from the Biological Laboratories in Princeton University, Volume 5Princeton University Press, 1916 Consists of reprints of articles from various journals. |
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Contributions from the Biological Laboratories in Princeton University, Volume 5 Visualização completa - 1916 |
Termos e frases comuns
acetone Activated half alcohol Anat angioblast anlage aortic arch appearance bacteria blood cells butyric acid cardino-Cuvierian caudal end centrifugal chemical chick chromatin circulation coccygeal veins concrescence cyclopia differentiated efferent aortic arch eggs electroplax endothelial endothelium erythrocytes experimental experiments fish formed gorgonians half disk Half with S. O. Half without S. O. head and pharynx Hyoidean artery independent and discontinuous independent anlagen injected embryo intra-embryonic Jour lateral pharyngeal lymphatic lymph vesicles lymphatic system medial pharyngeal lymphatic membrane mesenchymal cells metabolism nerve-cells normal nucleus observed otic communication otic lymph sac otocyst phatic phosphoresce photogen plasmosome polar bodies Precardinal or jugular precardinal vein pulsation rainbow trout rainbow trout embryo rate of regeneration reef region sea water sense organs shown side solution specimens spermatozoon stages stained steelhead trout Stockard subocular lymph sacs substance teleost thoracic duct tion Torpedo ocellata transverse section vascular venous yolk-sac
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Página 5 - Guanica by the writer during the latter part of May and the early part of June 1915, the fishes, batrachians, and reptiles have proven to be most interesting.
Página 607 - ... The bulk of the gorgonians varied from 1.5 pounds to 25.0 pounds, the spicule content from 0.45 pounds to 6.94 pounds, for the different squares. The average for all determinations was 7.746 pounds of gorgonian colonies containing 2.1225 pounds of spicules. 2. Distribution of gorgonians on the reefs about Tortugas. To determine the distribution of the species of gorgonians included in the foregoing analyses on the reefs about Tortugas a series of lines were laid out extending over a number of...
Página 5 - Upper jaw projecting; teeth sharp, more or less irregular on maxilla and vomer, indicating two series; series more or less single on mandible. Eye 2 in width of snout between anterior nostrils. Vertical fins well developed; dorsal beginning two-thirds length of head in front of vent, anal beginning directly behind vent; both continuous into caudal, which is wider and completely surrounds end of tail. Anterior nostril tube-like, near end of snout; large pore above this on top of snout. Posterior nostril,...
Página 11 - IV. Certain Dynamic Factors in the Regulatory Morphogenesis of Planaria dorotocephala in Relation to the Axial Gradient, Ibid., 13 (1912).
Página 487 - January 22. 1916 If the eggs of the marine gasteropod Crepidula plana are subjected to centrifugal force of approximately two thousand times gravity the yolk is thrown to the distal or centrifugal pole, the oil and other light substances to the centripetal pole, while the nucleus and centrosphere together with most of the cytoplasm occupy the middle zone between the other two. In eggs centrifuged after fertilization and before the first cleavage the yolk zone comprises a little more than three-quarters...
Página 490 - ... radiations are well developed without destroying the power of further development. On the other hand if nucleus and centrosphere are displaced from their normal positions during non-divisional stages and are prevented from returning by prolonged centrifuging they undergo division in these new positions and give rise to cells which are more or less removed from their normal places. Thus polar bodies and ectoderm cells may be caused to form at the vegetative pole or at any other point on the surface...
Página 200 - HaSO^ and acetic acid, and the purple color returns when the acid is washed out; nor is the cell killed, as protoplasmic rotation also returns. The same result has been obtained by Ruhland.6 It is difficult to judge of these results because exact molecular concentrations are not given, but they seem opposed to Bethe's experiment on medusae. Plant pigments are difficult to work with for two reasons: (1) The plant cell is usually cuticularized and is not readily wet by the acid solution; (2) anthocyan...
Página 72 - An examination of the methods used in the study of the development of the lymphatic system. Anat. Rec., vol. 5.
Página 485 - Zool., vol. 1. . 1905. Studies on regulation, IX. The positions and proportions of parts during regulation in Cestoplana in the presence of the cephalic ganglia.
Página 614 - C, figure 1, is not nearly as great as when a half-disk without rhopalia is compared with one on which the rhopalia remain (curves A and C, figure 1) . When the fact that the rate of pulsation of a half-disk contracting under the influence of an entrapped wave is on the average more than three times the normal rate for a disk of the same size is taken into account it is at once apparent that some factor other than muscular activity must be the most important influence in determining the rate of regeneration....