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Author: F. Keibel Publisher: Forgotten Books ISBN: 9780656215058 Category : Science Languages : en Pages : 50
Book Description
Excerpt from Normentafeln Zur Entwicklungsgeschichte Der Wirbeltiere, Vol. 10: Normal Plates of the Development of Lepidosiren Paradoxa and Protopterus Annectens Conspicuous features in these stages are the cement organ a crescentic structure on the ventral side and the external gill rudiments situated on visceral arches III - VI. About stage 23 in Lepidosiren a vascular network is seen over the surface of the yolk, its cavities filled with colourless blood there being for some time after its appearance no haemoglobin present. About the time of hatching (stage 27) the larva has a somewhat tadpole-like shape the hinder tail ]ike region of the trunk being flexed ventrally. In Protopterus a larger proportion of the yolk is con centrated in the anterior swollen part which as a consequence bulges more prominently and the rudiments of various organs external gills and eyes are also seen to be relatively larger than in Lepidosiren. Within a short space of time after hatching (stage 28) the trunk becomes straightened out and the pinnae of the external gills appear as two rows of little knobs on their external surface. The myotomes are seen to be growing actively in dorsiventral direction. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Author: F. Keibel Publisher: Forgotten Books ISBN: 9780656215058 Category : Science Languages : en Pages : 50
Book Description
Excerpt from Normentafeln Zur Entwicklungsgeschichte Der Wirbeltiere, Vol. 10: Normal Plates of the Development of Lepidosiren Paradoxa and Protopterus Annectens Conspicuous features in these stages are the cement organ a crescentic structure on the ventral side and the external gill rudiments situated on visceral arches III - VI. About stage 23 in Lepidosiren a vascular network is seen over the surface of the yolk, its cavities filled with colourless blood there being for some time after its appearance no haemoglobin present. About the time of hatching (stage 27) the larva has a somewhat tadpole-like shape the hinder tail ]ike region of the trunk being flexed ventrally. In Protopterus a larger proportion of the yolk is con centrated in the anterior swollen part which as a consequence bulges more prominently and the rudiments of various organs external gills and eyes are also seen to be relatively larger than in Lepidosiren. Within a short space of time after hatching (stage 28) the trunk becomes straightened out and the pinnae of the external gills appear as two rows of little knobs on their external surface. The myotomes are seen to be growing actively in dorsiventral direction. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Author: Ruth Bellairs Publisher: Elsevier ISBN: 0080454755 Category : Science Languages : en Pages : 495
Book Description
This outstanding work is the only modern book devoted to the chick embryo and has been an essential resource for geneticists, molecular and developmental biologists, and other life scientists who use the chick embryo as their research model. This new enlarged and updated second edition is published in response to continuing demand. The text provides a detailed description of development, from fertilization to hatching, with emphasis on the earlier stages though also covering individual organ systems in detail. There are reviews of the more recent molecular research and a new section highlighting the important landmarks in the history of chick embryology which have had an impact on our understanding of developmental processes. The book is beautifully illustrated with 74 text-figures and over 500 photographs, including nearly 200 new scanning electron micrographs. Updated and expanded text to accompany diagrams More than 200 new labelled scanning electron micrographs showing individual tissues in great detail Reviews of recent molecular research Discusses the roles of genes such as Hox genes, BMPs, and sonic hedgehog during early development New sections on genetical anomalies, techniques, and the poultry industry
Author: A.A.M. Gribnau Publisher: Springer ISBN: 9783540104698 Category : Medical Languages : en Pages : 86
Book Description
In the past decennia nonhuman primates have been increasingly used for research purposes in various scientific fields. Much interest has been focused on this group of animals in general and on the rhesus monkey in particular because of its close phylo genetic relationship with man. In some fields of research, however, such as embryology and microscopic anatomy, much less attention has been paid to nonhuman primates, probably because of the expense involved in the collection of the extensive material needed. On the other hand, teratological and experimental embryologic studies must be based upon a thorough knowledge of the normal ontogenesis since only in that way can a reliable distinction be made between normal and abnormal or induced develop ment. Each ontogenetic study essentially consists of a comparison of different deve lopmental stages. In most reports dealing with the development of individual organs or their subunits the material used is classified according to the estimated age or the length of the embryos. These criteria, however, are not valid, since considerable varia tion in developmental stage occurs between animals of the same age even between littermates and between animals of the same length. Therefore a method is needed for assigning embryos to successive developmental stages that are defmed on the basis of extemal and internal characteristics. This type of classification was elaborated by Stree ter (1942, 1945, 1948,1951), who arranged human embryos into developmental hori zons numbered XI through XXIII.
Author: Rudolf A. Raff Publisher: University of Chicago Press ISBN: 022625657X Category : Science Languages : en Pages : 545
Book Description
Rudolf Raff is recognized as a pioneer in evolutionary developmental biology. In their 1983 book, Embryos, Genes, and Evolution, Raff and co-author Thomas Kaufman proposed a synthesis of developmental and evolutionary biology. In The Shape of Life, Raff analyzes the rise of this new experimental discipline and lays out new research questions, hypotheses, and approaches to guide its development. Raff uses the evolution of animal body plans to exemplify the interplay between developmental mechanisms and evolutionary patterns. Animal body plans emerged half a billion years ago. Evolution within these body plans during this span of time has resulted in the tremendous diversity of living animal forms. Raff argues for an integrated approach to the study of the intertwined roles of development and evolution involving phylogenetic, comparative, and functional biology. This new synthesis will interest not only scientists working in these areas, but also paleontologists, zoologists, morphologists, molecular biologists, and geneticists.
Author: Evelyn Fox Keller Publisher: Columbia University Press ISBN: 9780231102056 Category : Philosophy Languages : en Pages : 164
Book Description
Refiguring Life begins with the history of genetics and embryology, showing how discipline-based metaphors have directed scientists' search for evidence. Keller continues with an exploration of the border traffic between biology and physics, focusing on the question of life and the law of increasing entropy. In a final section she traces the impact of new metaphors, born of the computer revolution, on the course of biological research. Keller shows how these metaphors began as objects of contestation between competing visions of the life sciences, how they came to be recast and appropriated by already established research agendas, and how in the process they ultimately came to subvert those same agendas. Refiguring Life explains how the metaphors and machinery of research are not merely the products of scientific discovery but actually work together to map out the territory along which new metaphors and machines can be constructed. Through their dynamic interaction, Keller points out, they define the realm of the possible in science. Drawing on a remarkable spectrum of theoretical work ranging from Schroedinger to French psychoanalyst Jacques Lacan, Refiguring Life fuses issues already prominent in the humanities and social sciences with those in the physical and natural sciences, transgressing disciplinary boundaries to offer a broad view of the natural sciences as a whole. Moving gracefully from genetics to embryology, from physics to biology, from cyberscience to molecular biology, Evelyn Fox Keller demonstrates that scientific inquiry cannot pretend to stand apart from the issues and concerns of the larger society in which it exists.
Author: F. Keibel
Author: F. Keibel
Author: Library of Congress
Author: Ruth Bellairs
Author: Thomas Hunt Morgan
Author: Emil Witschi
Author: A.A.M. Gribnau
Author: Rudolf A. Raff
Author: Lynn K. Nyhart
Author: Ronan O'Rahilly
Author: Evelyn Fox Keller