[PDF] Invertebrate Endocrinology And Hormonal Heterophylly eBook

Author : W.J. Burdette
Publisher : Springer Science & Business Media
Page : 381 pages
File Size : 16,5 MB
Release : 2012-12-06
Category : Medical
ISBN : 3642657699

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ull recognition of the important role that hormones play in the growth, F differentiation, and function of insects was preceded by rather advanced information about identity and action of mammalian hormones. However, extirpation and transplantation of endocrine glands in insects and segmental ligation of larvae gradually yielded knowledge about the location of endo crine cells in insects and led to labeling their hormonal product with appropriate names. The development of relatively sensitive assays permitted the separation of active extracts of the hormones associated with meta morphosis and quickened the pace of discovery. Finally, identification of structural formulae of natural hormones now has provided the means for detailed study of biochemical events with which they are associated. In the meantime, better interpretation of the mechanism for morphologic and functional effects of hormones in vertebrates has come about through knowledge of binding of hormones in target tissues, feed-back, and other mechanisms. There has been a prodigious increase in information recently, not only about the structure of molting and juvenile hormones, but also about their molecular action, as well as recognition of problems still posed by their of origin, and relation to genic derepression. biosynthesis, interactions, sites Discovery and study of phytohormones and analogs has added interest and amplified techniques for investigation.

Author : W.J. Burdette
Publisher : Springer
Page : 438 pages
File Size : 21,39 MB
Release : 1974-04-18
Category : Medical
ISBN : 9783540065944

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ull recognition of the important role that hormones play in the growth, F differentiation, and function of insects was preceded by rather advanced information about identity and action of mammalian hormones. However, extirpation and transplantation of endocrine glands in insects and segmental ligation of larvae gradually yielded knowledge about the location of endo crine cells in insects and led to labeling their hormonal product with appropriate names. The development of relatively sensitive assays permitted the separation of active extracts of the hormones associated with meta morphosis and quickened the pace of discovery. Finally, identification of structural formulae of natural hormones now has provided the means for detailed study of biochemical events with which they are associated. In the meantime, better interpretation of the mechanism for morphologic and functional effects of hormones in vertebrates has come about through knowledge of binding of hormones in target tissues, feed-back, and other mechanisms. There has been a prodigious increase in information recently, not only about the structure of molting and juvenile hormones, but also about their molecular action, as well as recognition of problems still posed by their of origin, and relation to genic derepression. biosynthesis, interactions, sites Discovery and study of phytohormones and analogs has added interest and amplified techniques for investigation.

Author : Nate F. Cardarelli
Publisher : CRC Press
Page : 331 pages
File Size : 28,99 MB
Release : 2019-06-04
Category : Medical
ISBN : 1000013278

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First published in 1986. Taken from the Tin and Cell Malignancy Symposium, this volume will help others to appreciate the interdisciplinary nature of this field.

Author : J. Hoffmann
Publisher : Springer
Page : 544 pages
File Size : 10,69 MB
Release : 1984-11
Category : Science
ISBN :

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The neuroendocrine control of reproduction and development of inver­ tebrates has a long tradition as an important area of research in France. The reader of this volume is certainly familiar with the significant con­ tributions to this field made by such outstanding scientific personalities as J ean-J acques Bounhiol, Jean Panouse, Bernard Possompes, Pierre and Line Joly, Helene Charniaux-Cotton,Maurice Durchon, Manfred Gabe, Guy Echalier, Marie Raabe, and others. It is therefore not surprising that the Centre National de la Recherche Scientifique (CNRS) sponsored, in 1975 and 1983, two major inter­ national meetings devoted to this subject. The organizers of the 1975 meeting, which was held in Lille, decided to concentrate on the bio­ synthesis, metabolism, and mode of action of the invertebrate hor­ mones. To some extent, Professors Durchon and J oly wanted to convey the message that they felt that the period of classical invertebrate endo­ crinology had come to an end and that traditional approaches were be­ ing replaced by biochemical analyses. How right they were is illustrated by the present volume. Today biochemistry, molecular biology, and analytical chemistry are tools of the invertebrate endocrinologist, who now starts his morning work by homogenizing his worm, mollusc, insect . . . and by extracting DNA, steroids, or peptides.

Author : Gyorgy Csaba
Publisher : Springer
Page : 0 pages
File Size : 11,36 MB
Release : 2011-12-23
Category : Science
ISBN : 9783642801082

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Comparative endocrinology helps to find the roots of homeostatic regulation in organisms. In this context, many years ago a series of experiments were done, which demonstrated the hormonal regula tion also on the invertebrate level. The mechanisms are partly similar, partly different, from those found in vertebrates. The new receptor era of mammalian endocrinology stimulated research on invertebrate hormone receptors, and sophisticated methods are applied also to determine hormones. The experiments demonstrated the existence and even similar function of these structures and signaling molecules. However, data on hormones and receptors at the lowest level of metazoan life and the highest level of protozoan life were not at our disposal. About two decades ago, first observations on the presence of hormone receptors reacting to vertebrate hormones in protozoa were made. Since the early 1980s we know that hormone-like molecules similar to those of higher vertebrates are present also in unicellular organisms. The presence of some second messengers in Tetrahymena was recognized. Since then, the research has been extended and many structures - previously believed to be solely vertebrate characteristics, such as opiate receptors, similar to mammalian ones - were found in unicellular organisms. These observations justified the assumption of a complete endocrine system at protozoan level, where - considering the unicellularit- this seemed to be not required. However, it became clear that the roots of endocrine communication date back at least 2 billion years.

Author : Nathan F. Cardarelli
Publisher : CRC Press
Page : 352 pages
File Size : 23,60 MB
Release : 2019-07-17
Category : Medical
ISBN : 1000694658

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First published in 1989: This text was written to provide a relatively broad comprehensive study of the thymus in health and disease, including relationships to the endocrine system, immue system, and again.

Author : Frederick D. Obenchain
Publisher : Elsevier
Page : 523 pages
File Size : 44,32 MB
Release : 2013-10-22
Category : Science
ISBN : 1483162346

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Physiology of Ticks focuses on the unique (and probably the most vulnerable) features of tick physiology and the physiological aspects of tick interactions with their hosts. The mechanisms used by non-feeding ticks to maintain their water balance are examined, along with the salivary mechanisms used by feeding ixodid ticks for excreting the enormous excess volumes of water and salts taken in during blood sucking. This book is comprised of 13 chapters and begins with a description of the morphology, deposition, and components of the tick cuticle. The discussion then turns to humidity relationships and water balance of ticks, as well as the sensory basis of tick feeding behavior and the immunological basis of host resistance to ticks. Subsequent chapters explore blood digestion in ticks; tick reproduction, with emphasis on sperm development, cytogenetics, oogenesis, and oviposition; effects of insect hormones and their mimics on tick development and reproduction; and the mechanisms of tick pheromones. The final chapter deals with diapause and biological rhythms in ticks. This monograph will be of value to entomologists, physiologists, biologists, and practitioners of tropical science.

Author : G. A. Kerkut
Publisher : Elsevier
Page : 613 pages
File Size : 30,29 MB
Release : 2013-10-22
Category : Science
ISBN : 1483286215

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Endocrinology II concerns the actions of hormones in insects, complementing Volume 7 which is concerned with the production and chemistry of insect hormones. While the preceding volume is directed mainly towards the insect endocrinologist, this volume has much of intrinsic interest to the general physiologist. It deals with the regulation of metabolism, reproduction, cuticle properties, and certain aspects of behaviour from a systems point of view and amply documents how hormones have provided basic insights into the functioning of such systems. Interference in endocrine regulation could provide future systems for insect control and this volume will provide the foundation on which the future formulation of these strategies is based. More information on diverse aspects of insect hormone action is brought together here than in any previous single work and this volume will therefore be a valuable reference source for many years to come.