منابع مشابه
The Formation of the Aster in Artificial Parthenogenesis
In normally fertilized eggs the development of the aster is attributed to a substance carried into the egg by the spermatozoon. The aster first makes its appearance in the form of diminutive radiations surrounding the neck-piece of the spermatozoon within a few minutes after it has entered the egg. The writer 1 has shown that the formation of the radiations is accompanied by a jellying of the c...
متن کاملArtificial Parthenogenesis and Fertilization (1913), by Jacques Loeb
Jacques Loeb [5] is best known for his embryological work investigating parthenogenesis in invertebrates. Artificial Parthenogenesis and Fertilization [4] is a revised and English-translated work from his earlier book, Die chemische Entwicklungserregung des tierischen Eies (1900). Artificial Parthenogenesis [6] describes Loeb?s many and varied methodical experiments to initiate egg [7] developm...
متن کاملA Cytological Study of Artificial Parthenogenesis in the Sea Urchin Arbacia Punctulata
Eggs of the sea urchin Arbacia punctulata were artificially activated with hypertonic seawater. The artificially activated eggs undergo the cortical reaction which is not distinguished by a wavelike progression as in the case of inseminated eggs. The cortical granules are released at random loci at the surface of the egg and result in spaces separated by large cytoplasmic projections. Unreacted...
متن کاملautopolyploidy and parthenogenesis in animals
6 1 Division of Epigenetics, DKFZ-ZMBH Alliance, German Cancer Research Center (DKFZ), 7 Im Neuenheimer Feld 580, 69120 Heidelberg, Germany 8 2 Institute for Environmental Sciences, University of Koblenz-Landau, Forststrasse 7, 76829 9 Landau, Germany 10 3 Institute of Pharmacy and Biochemistry, Johannes Gutenberg-University Mainz, 11 Staudingerweg 5, 55128 Mainz, Germany 12 * present address: ...
متن کاملPhenotypic evolution and parthenogenesis
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ژورنال
عنوان ژورنال: Parasitology
سال: 1915
ISSN: 0031-1820,1469-8161
DOI: 10.1017/s0031182000009811