Author: Edwin Grant ConklinPublisher:
ISBN:
Category : Embryology
Languages : en
Pages : 0
Book Description
The Organization and Cell-lineage of the Ascidian Egg
Author: Edwin Grant ConklinPublisher:
ISBN:
Category : Embryology
Languages : en
Pages : 0
Book Description
The Organization and Cell-lineage of the Ascidian Egg
Author: Edwin Grant ConklinPublisher:
ISBN:
Category : Embryology
Languages : en
Pages : 186
Book Description
The Organization and Cell-Lineage of the Ascidian Egg (Classic Reprint)
Author: Edwin G. ConklinPublisher:
ISBN: 9781332305292
Category : Science
Languages : en
Pages : 174
Book Description
Excerpt from The Organization and Cell-Lineage of the Ascidian Egg May not these differentiations appear at still earlier stages and "organ-forming germ regions" be marked out in the egg before cleavage begins. Finally does the organization of the egg arise de novo in the ovary, or may a certain part of it be carried over from generation to generation, and is this early organization of the egg in any way different from the organization of any cell? These are problems of profound importance which lie at the basis of any thorough study of development, inheritance and evolution. B. Ascidian Embryology. - Anyone who has observed the ascidian egg will understand why it has been such a favorite object of study. The cleavage of the egg is so beautifully regular and can be observed so readily in life that it is not surprising that ascidians were among the first animals to which the "cell-lineage" method was applied. It is surprising, however, to find such diversity of opinion with regard to the development of these animals; even in some of the most important points in the early development, such as the relation of the poles of the egg to those of the gastrula, or the cell origin of the germ layers, scarcely two authors agree, in spite of the fact that these eggs are perhaps as favorable as any others in the whole animal kingdom for the stud of these problems. Under the circumstances it is impossible to avoid the conclusion that a large amount of very careless work has been done in this field. Accuracy is ever the avowed aim of science, and when one finds scientific work unpardonably inaccurate he may justly feel indignant. For some reason or other ascidian embryology has ever been a field of conflict and confusion. In some cases controversy has raged for years around a mere blunder which has thus gained a sort of immortality rarely attained by accurate work. But ascidian embryology furnishes illustrations not only of inaccurate work; it also affords some of the most classical examples of accurate and substantial research. Considering the time when the- were written, Kowalevsky's papers (1866, 1871) are models of accuracy. The beautiful studies of Van Beneden and Julin on the segmentation of the ascidian egg and on the morphology of the tunicates (1884, 1886) surpass in excellence anything which had been done up to that time, and in some respects they have not been equalled by an more recent work on the development of these animals. Chabry's (1887) classical paper on the normal and teratological embryology of ascidians is a masterpiece, - one of the first and best illustrations of the application of the experimental method to the study of embryology. After this, the most important work dealing with the early development of ascidians is that of Castle (1894, 1896), although it is marred by some fundamental mistakes; he has applied in detail the method of cell lineage to the study of the development of Ciona intestinalis, and has followed the history of the individual cleavage cells farther than had any of his predecessors. Other work which deserves mention has been done by Kupffer (1870), Seeliger (1885), Davidoff (1889), Samassa (1894) and others, and will be referred to later in the body of this work. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com
Development of Sea Urchins, Ascidians, and Other Invertebrate Deuterostomes: Experimental Approaches
Author: Charles A. EttensohnPublisher: Gulf Professional Publishing
ISBN: 9780124802797
Category : Science
Languages : en
Pages : 948
Book Description
This book provides a practical guide to experimental methods for studying the development of invertebrate deuterostomes, such as sea urchins, ascidians, hemichordates, and amphioxus. These model organisms are of contemporary and historical importance to the study of developmental biology, particularly genomic research. The chapters provide detailed experimental protocols that cover a broad range of topics in modern experimental methods. Topics covered range from rearing embryos to the care of adult animals, while also presenting the basic experimental methods including light and electron microscopy, used to study gene expression, transgenics, reverse genetics, and genomic approaches. * Covers a wide range of methods, from classical embryology through modern genomics * Discusses animals related to vertebrates, providing a valuable evolutionary perspective * Includes a practical guide to the use of sea urchins in the teaching laboratory
Cell Lineage and Embryo Patterning
Author: Publisher: Elsevier
ISBN: 008048915X
Category : Science
Languages : en
Pages : 643
Book Description
International Review of Cytology presents current advances and comprehensive reviews in cell biology, both plant and animal. Articles address structure and control of gene expression, nucleocytoplasmic interactions, control of cell development and differentiation, and cell transformation and growth. Authored by some of the foremost scientists in the field, each volume provides up-to-date information and directions for future research.This volume brings together current information on the localization and roles of RNAs in cell-lineage determination and subsequent patterning in embryonic development. Guest co-editor Lawrence Etkin is one of the leading researchers in molecular genetics of Xenopus.Key Features* A number of important concepts are discussed, including:* How polarity is established during oogenesis* How germ cell determinants become organized in the establishment of the germ cell lineage* Different strategies used by organisms to establish the germ cell lineage* Similarities and differences between the mechanisms used in embryonic patterning* The mechanisms and machinery by which molecules such as RNA become asymmetrically segregated* The use of similar signaling pathways in patterning of the dorsal-ventral and right-left asymmetries, embryonic germ layers, limb, and nervous system* The link between fundamental biological processes such as RNA translation and localization in the regulation of axis specification
The Biology of Ascidians
Author: H. SawadaPublisher: Springer Science & Business Media
ISBN: 4431669825
Category : Science
Languages : en
Pages : 477
Book Description
Ascidians are the invertebrate group that gave rise to vertebrates, thus the biology of ascidians provides an essential key to understanding both invertebrates and vertebrates. This book is the first to cover all areas of ascidian biology, including development, evolution, biologically active substances, heavy metal accumulation, asexual reproduction, host-defense mechanisms, allorecognition mechanisms, comparative immunology, neuroscience, taxonomy, ecology, genome science, and food science. The 69 articles that make up the collection were contributed by leading ascidiologists from all over the world who participated in the First International Symposium on the Biology of Ascidians, held in June 2000 in Sapporo, Japan. For scientists and students alike, the book is an invaluable source of information from the latest, most comprehensive studies of ascidian biology.
Cell Lineage and Fate Determination
Author: Sally A. MoodyPublisher: Elsevier
ISBN: 0080528783
Category : Science
Languages : en
Pages : 661
Book Description
Cell Lineage and Fate Determination provides a comprehensive view of the mechanisms regulating cell lineage and fate determination in an effort to understand how the fertilized egg is transformed into a complex of specialized tissues. It presents basic information on eight different animal models and recent developmental biological research done in each model. The book provides a focused forum presenting key information for researchers studying various aspects of developmental and cellular biology. Extensive use of tables and black-and-white and color figures helps illustrate each model. The book concludes by discussing future goals for bringing cellular, molecular, and genetic research to clinical applications and tissue replacement therapies.Key Features* Presents eight different animal models* Provides a focused forum on cell fate determination that provides comprehensive and key information for researchers* Illustrates the transitional relationship between researchers and clinicians* Includes the extensive use of tables and color figures
Developmental Genomics of Ascidians
Author: Noriyuki SatohPublisher: John Wiley & Sons
ISBN: 1118656245
Category : Science
Languages : en
Pages : 313
Book Description
The simplicity and lack of redundancy in their regulatory genes have made ascidians one of the most useful species in studying developmental genomics. In Developmental Genomics of Ascidians, Dr. Noriyuki Satoh explains the developmental genomics of ascidians, stresses the simplicity of Ciona developmental system, and emphasizes single-cell level analyses. This book actively accentuates the advantages of using ascidians as model organisms in an up-and-coming field of developmental genomics.
The Molecular Biology of Cell Determination and Cell Differentiation
Author: Leon W. BrowderPublisher: Springer Science & Business Media
ISBN: 146156817X
Category : Science
Languages : en
Pages : 448
Book Description
This series was established to create comprehensive treatises on specific topics in developmental biology. Such volumes serve a useful role in developmental biology, which is a very diverse field that receives contributions from a wide variety of disciplines. This series is a meeting ground for the various practi tioners of this science, facilitating an integration of heterogeneous information on specific topics. Each volume is comprised of chapters selected to provide the conceptual basis for a comprehensive understanding of its topic as well as an analysis of the key experiments upon which that understanding is based. The specialist in any aspect of developmental biology should understand the experimental back ground of the specialty and be able to place that body of information in context, in order to ascertain where additional research would be fruitful. The creative process then generates new experiments. This series is intended to be a vital link in that ongoing process of learning and discovery.
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