The Internal Influences that Determine the Relative Size of Double Structures in Planaria Lugubris
Author: Thomas Hunt Morgan
Publisher:
Published: 1902
Total Pages:
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Author: Thomas Hunt Morgan
Publisher:
Published: 1902
Total Pages:
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DOWNLOAD EBOOKAuthor: Frank Rattray Lillie
Publisher:
Published: 1902
Total Pages: 330
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DOWNLOAD EBOOKVols. 17, 21-105 contain Annual reports of the Marine Biological Laboratory for 1907/08-1952.
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Published: 1915
Total Pages: 864
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Published: 1904
Total Pages: 1284
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DOWNLOAD EBOOKAuthor: Thomas Hunt Morgan
Publisher:
Published: 1910
Total Pages: 516
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Published: 1903
Total Pages: 1302
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DOWNLOAD EBOOKIndexes the world's zoological and animal science literature, covering all research from biochemistry to veterinary medicine. The database provides a collection of references from over 4,500 international serial publications, plus books, meetings, reviews and other no- serial literature from over 100 countries. It is the oldest continuing database of animal biology, indexing literature published from 1864 to the present. Zoological Record has long been recognized as the "unofficial register" for taxonomy and systematics, but other topics in animal biology are also covered.
Author: Seth Tyler
Publisher: Springer Science & Business Media
Published: 2012-12-06
Total Pages: 396
ISBN-13: 9401127751
DOWNLOAD EBOOKTurbellarian platyhelminths (or, as they are known now among cladistic systematists, free-living Platyhelminthes) comprise a widely distributed assemblage of lower worms found in marine, freshwater, and even occasionally in terrestrial habitats. The phylum Platyhelminthes may be more widely known for its parasitic members since the major parasitic groups of the tapeworms, flukes, and their relatives are more speciose and have greater impact on everyday human life; but the turbellarians are more diverse and, as inhabitants of virtually any aquatic habitat, are more widespread as well. Many of the lower turbellarians are rather simple in morphology and have served as models for ancestors of the Bilateria, i.e., the bulk of the animal phyla. Others are quite complex organisms, especially in the morphology of their reproductive systems which are highly specialized. The majority are free-living in aquatic habitats but a number of interesting parasitic and commensal species are found scattered among the higher turbellarian taxa. But turbellarians are more than just taxonomic curiosities. They have served as illustrative models in research on a variety of basic life processes. For example, their high capacity for regeneration has made them the subject of a large literature in developmental biology, the occurrence of mixoploidy and other karyological oddities among turbellarians has been important in understanding evolution of the genome, and the fine structure and biochemistry of the nervous system in turbellarians is revealing important principles of the organization of so-called primitive neural systems.
Author: H. V. Brøndsted
Publisher: Elsevier
Published: 2013-10-22
Total Pages: 311
ISBN-13: 1483186296
DOWNLOAD EBOOKPlanarian Regeneration deals with regeneration problems including embryogenesis and morphogenesis. The book compares the principles involved in the regeneration processes with those in ontogenesis from the egg. The author also reviews the works of Thomas H. Morgan and Charles M. Child which became the basis for systematic scientific investigation of regeneration. The head regenerates vigorously, with a faster rate behind the eyes, then at various levels along the longitudinal axis of the planarian body. A time-graded regeneration includes inhibitory forces and some genetic codes that determine such rate. The time-graded field has been proven by transplantation experiments; the author addresses the morphological structure to which biochemical factors or processes determine the different rate of regeneration. He notes that the nervous system conforms to these processes as shown by studies of Lender and Klein (1961). The author suggests that the study of regeneration in planarians should involve time considerations quantitatively to explain some substance, if any, from the nervous system that activates the cytoplasm of neoblasts, and then the genome. This book will prove valuable for zoologists and researchers in genetics, biochemistry or molecular biology.
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Published: 1902
Total Pages: 1154
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Published: 1905
Total Pages: 1038
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