Patterns in Plant Development offers an introduction to the development of the whole plant. It is essentially a factual book that describes the complex phenomena of development in vascular plants. The point of view is structural, and emphasis is placed on the experimental approach to development. The book deals with lower vascular plants (e.g. ferns) as well as seed plants, so that the treatment of the plant, beginning with the embryo and continuing through the phase of secondary growth (the vascular cambium) is presented. The book is written so that anyone who has completed a basic first-year university course in biology or botany will be able to use it without difficulty. Sufficient background information is provided so that the reader is not required to have an extensive technical background.

The technique of allometry investigates the effects of size on such variables as food intake, energy requirements, growth rates and age at first reproduction. This book, now available in paperback, brings together much of what is known about the consequences of size and provides a new and mathematically rigorous framework within which many quantitative predictions are made and tested using published and unpublished data. New explanations are proposed for many previously unexplained phenomena such as why in some species females are thousands of times heavier than males, whereas in no species are males more than about eight times heavier than females. The models presented afford a new synthesis of the effects of size and open up more pathways for further theoretical investigation and experimental testing. Care has been taken to give verbal presentations of all the mathematical conclusions to ensure that the text is widely intelligible.

Coverage of the field in Instant Notes in Developmental Biology is current and focuses largely on the principles of embryonic development. It is designed to provide a clear summary of the principles of developmental biology in a compact and easily manageable structure.

A light-hearted look at the nature of academic science, intended for anyone interested in biology but particularly for biology students who want to find out what the future holds in store. The "Egg" of the title refers to the science of developmental biology, which is the speciality of the author, and which provides the material for many of the anecdotes. The "Ego" relates to the vanity of the scientists themselves. Academic scientists have to struggle to maintain their research funding. To do this they must persuade other scientists that they are very good, and that means working at a good institution, publishing papers in the most fashionable journals and giving lectures at the most prestigious meetings. Success often goes to those with the largest egos and it is their style of operation that is described in this book. The author is a well-known scientist who has worked at both universities and research institutes. He has published over 100 scientific papers and an influential book about embryonic development: "From Egg to Embryo".

The editors present, in a single volume, a valuable reference source for students of mammalian embryology, genetics, and physiology, this book provides a thorough overview of the field of embryonic development - its current status along with possible directions in the future.

Why does nature love symmetry? In Asymmetry, Developmental Stability and Evolution, Møller and Swaddle analyse the evolutionary implications of symmetry. They advance and explain their theory that symmetry is related to genetic stability and fitness, and that symmetric individuals appear to have quantifiable and significant advantages over their asymmetric counterparts. When assessing potential mates or competitors, animals may be able to use symmetry as an honest indication of quality. This interdisciplinary book, with its associated Web-site, will be of interest to students and researchers in the fields of ecology, evolutionary biology, genetics, and animal behaviour.

This description of a model system for cell differentiation and organogenesis is written by one of the foremost researchers in the area. The main emphasis is on the mammalian kidney, but the book also deals with the development of the transien excretory organs. It includes discussions of induction, proliferation, early cytodifferentiation and morphogenesis and organogenesis. This authoritative account will be valuable to developmental biologists and also to scientists working in paediatric nephrology. As it gives the background of normal development and of control systems, it will also be of use to nephrologists working on abnormalities in the urinary tract.

Regulation of the Early Development of the Nervous System by Growth Factors; P.F. Bartlett, et al. Polysialic Acid as a Regulator of CellCell Interactions during Muscle Innervation; U. Rutishauser. The O2A Cell Lineage; G. Levi, C. Agresti. Cell Fate in the Cerebral Cortex; J. Price. Hox Genes and the Development of the Branchial Region; P. Hunt, et al. A General Model of Cortical Histogenesis V.S. Caviness, Jr., T. Takahashi. The Use of Experimental Genetics to Study Pattern Formation in the Mammalian CNS; K. Herrup. Comparative and Cellular Aspects of Development of Connections in Cerebral Cortex; G.M. Innocenti. The Developing Mouse Whiskerpad; W. Ourednik, et al. Two Phases of Pattern Formation in the Developing Rodent Trigeminal System; S. Jhaveri, R. Erzurumlu. Andogen-Dependent Plasticity of a Neuromuscular System; C. Cracco, A. Vercelli. 7 additional articles. Index.

This book considers in detail the mechanisms of a major human problem. Chromosome imbalance affects all stages of life in ways ranging from spontaneous abortion and retardation to behavioural problems and malignancy. Charles J. Epstein concerns himself with how and why a particular chromosome imbalance produces a specific phenotype. His fundamental goal is to connect chromosome aberrations with functional abnormalities in terms of gene expression, developmental and cell biology, and metabolism. Through his examination of this relationship, we learn more about normal development and function. The book begins with an exploration of several human autosomal aneuploid phenotypes, with particular emphasis on the relationship between genotype and phenotype. In the next part, broad theoretical considerations of the mechanisms which generate these phenotypes are examined with reference to studies on man and other organisms such as bacteria and mice. Experimental approaches to study the effects of aneuploidy are presented next with special attention paid to the development of model systems for studying human aneuploidy.

Gene Regulatory Networks, Volume 139 in the Current Topics in Developmental Biology series, highlights new advances in the field, with this new volume presenting interesting chapters written by an international board of authors. Topics in this release include Mouse hindbrain GRN, Xenopus endoderm GRN - organogenesis, Vertebrate limb GRN, The notochord gene regulatory network in chordate evolution: conservation and divergence from Ciona to vertebrates, Ciona early embryo GRNs, Boolean logic models, Modeling GRN response to morphogen gradient, GRN architecture, Theory of GRN evolution, Evolution of fly segmentation GRNs, GRN evolution in echinoderms, Evolution of network specificity, and more.

Methods in Cell Biology, Volume 158, the latest release in this series, highlights new advances in the field, with this release covering How to orient cells in micro-cavities for high resolution imaging of cytokinesis and lumen formation, A body-on-a-chip (BOC) system for studying gut-liver interaction, Manipulating cultured mammalian cells for mitosis research, Live-cell FLIM-FRET using a commercially available system, A comparative analysis of methods to measure kinetochore-microtubule attachment stability, A workflow for visualizing human cancer biopsies using large-format electron microscopy, Isolation of stage-specific germ cells using facs in drosophila germarium, Computational analysis of filament polymerization dynamics in cytoskeletal networks, and more.

Ever wondered why your life and health can sometimes be so hard to control? Or why it seems so easy for other people? Mark Hanson and Lucy Green draw on their years of experience as scientists and educators to cut through the usual information on genetics and lifestyle to reveal the secrets of early development which start to make each of us unique, during our first 1,000 days from the moment of conception. Some surprising discoveries, based on little-known new research, show how events during our first 1,000 days make each of us who we are and explain how we control our bodies, processes that go way beyond just the genes which we inherited. Provoking new ways of thinking about being parents, this book empowers individuals and society to give the next generation the gift of a good start to life and future health.

The studies described here were carried out in the Neuroregul ation Group, Department of Physiology, University of Leiden, the Netherlands. Over the last decade, this group, in close collaboration with the Department of Neurosurgery of the Academic Hospital of Leiden, has studied the development of the central nervous system from a neuroanatomical as well as a clinical perspective. During this period, the expression of several morphore gulators in the developing rat spinal cord was extensively investigated. Parallel studies focused on the development of the spinal cord fiber systems, which was studied by means of the intrauterine use of neuronal tracers. The main goal of these studies was to extend our knowledge about the (normal) generation of the spinal cord and to contribute to the under standing of clinical problems related to regeneration and degeneration in the mammalian central nervous system. The studies on morphoregulators, in particular, appeared to benefit two different scientific areas. Firstly, the correlation between morphoregulator expression patterns and known anatomy contributed to our knowledge about spinal cord development. Secondly, the correlation between morpho regulator expression patterns and known developmental processes may help to understand their precise function(s). This volume of Advances in Anatomy, Embryology and Cell Biology presents these particular studies on the development of the rat spinal cord performed over the last decade. As well as integrating the results of the tracer studies, this volume also provides an update on the development of the rat spinal cord.

This unique book looks at the biology of aging from a fundamentally new perspective, one based on evolutionary theory rather than traditional concepts which emphasize molecular and cellular processes. The basis for this approach lies in the fact that natural selection, as a powerful determining force, tends to decline in importance with age. Many of the characteristics we associate with aging, the author argues, are more the result of this decline than any mechanical imperative contained within organic structures. This theory in turn yields the most fruitful avenues for seeking answers to the problem of aging, and should be recognized as the intellectual core of gerontology and the foundation for future research. The author ably surveys the vast literature on aging, presenting mathematical, experimental, and comparative findings to illustrate and support the central thesis. The result is the first complete synthesis of this vital field. Evolutionary biologists, gerontologists, and all those concerned with the science of aging will find it a stimulating, strongly argued account.

In this book, Eric Charnov uses ideas about symmetry, invariance, and scaling laws to explore aspects of population dynamics and the evolution of male and female life histories. Charnov's work is internationally known and will attract great interest among postgraduate students and researchers in ecology, evolution, behaviour, and many other fields within organismal biology.

These Notes grew from my research in evolutionary biology, specifically on the theory of evolutionarily stable strategies (ESS theory), over the past ten years. Personally, evolutionary game theory has given me the opportunity to transfer my enthusiasm for abstract mathematics to more practical pursuits. I was fortunate to have entered this field in its infancy when many biologists recognized its potential but were not prepared to grant it general acceptance. This is no longer the case. ESS theory is now a rapidly expanding (in both applied and theoretical directions) force that no evolutionary biologist can afford to ignore. Perhaps, to continue the life-cycle metaphor, ESS theory is now in its late adolescence and displays much of the optimism and exuberance of this exciting age. There are dangers in writing a text about a theory at this stage of development. A comprehensive treatment would involve too many loose ends for the reader to appreciate the central message. On the other hand, the current central message may soon become obsolete as the theory matures. Although the restricted topics I have chosen for this text reflect my own research bias, I am confident they will remain the theoretical basis of ESS theory. Indeed, I feel the adult maturity of ESS theory is close at hand and I hope the text will play an important role in this achievement.

The North American opossum (Didelphis virginiana) generally is regarded as an important animal, phylogenetically. It is considered to represent a prototype marsupial and closely resembles fossil didelphids (Tyndale-Biscoe 1973). Numerous studies concerning the reproductive biology, embryology, and neurobiology of the opossum have been published. More recently, Didelphis has become popular as an animal model for gastroenterological studies because of the remarkable anatomical and physiological similarities of the esophagus as compared to that of man. Most of the studies of early development have concentrated on early cleavage stages and the formation of the three primary germ layers (Hartman 1916, 1919) and fetal membranes (Selenka 1887; McCrady 1938). The ova of Didelphis remain in the oviduct only for about 24 h before entering the uterus. A corona radiata is absent and each oocyte is surrounded only by a perivitel- line space and a zona pellucida (Talbot and DiCarlantonio 1984). During the short transit period, the egg is fertilized by a single spermatozoon (Rodger and Bedford 1982a,b).

During the last four decades remarkable developments have taken place in instrumentation and techniques for characterizing the microstructure and microcomposition of materials. Some of the most important of these instruments involve the use of electron beams because of the wealth of information that can be obtained from the interaction of electron beams with matter. The principal instruments include the scanning electron microscope, electron probe x-ray microanalyzer, and the analytical transmission electron microscope. The training of students to use these instruments and to apply the new techniques that are possible with them is an important function, which. has been carried out by formal classes in universities and colleges and by special summer courses such as the ones offered for the past 19 years at Lehigh University. Laboratory work, which should be an integral part of such courses, is often hindered by the lack of a suitable laboratory workbook. While laboratory workbooks for transmission electron microscopy have-been in existence for many years, the broad range of topics that must be dealt with in scanning electron microscopy and microanalysis has made it difficult for instructors to devise meaningful experiments. The present workbook provides a series of fundamental experiments to aid in "hands-on" learning of the use of the instrumentation and the techniques. It is written by a group of eminently qualified scientists and educators. The importance of hands-on learning cannot be overemphasized.

This fully-revised new edition of the best-selling Equine Clinical Medicine, Surgery and Reproduction is supported by over 1800 illustrations of the highest quality: colour photographs, diagnostic images including MRI and CT, and diagrams. System-based, the chapters introduce each individual system with precise information on the relevant basic anatomy and physiology, standard clinical examination techniques and useful differential diagnostic aids. This is followed by diseases and disorders that are pertinent to that system, grouped together either anatomically or based on presenting clinical signs. Each condition is described using consistent headings: definition/overview, etiology and pathophysiology, clinical presentation, diagnosis, differential diagnoses, management/treatment, and prognosis. Additional chapters deal with the foal and wounds. New to the second edition: - All chapters are updated throughout - Additional chapters on the axial musculoskeletal system (neck, back and pelvis) and muscle diseases and problems - A whole new section on soft tissue injuries of the foot - More information on diagnostic tests including over-ground endoscopy, chest and liver ultrasonography, head CT, and foot MRI - Material on equine dentistry, neurology, endocrine system, the foal, and the liver has been considerably expanded - All illustrations and photographs have been reviewed and many replaced with higher quality images. The focus throughout remains on providing clinically relevant information required for practical case management, plus sufficient background on causes and disease processes to enable readers to understand the conditions and the rationale for diagnostic and treatment options. An international group of respected clinicians have come together under the editorship of Dr Graham Munroe to create a textbook that will be of lasting value as a teaching and training resource for equine clinical teachers and their students in veterinary medicine and related equine courses, as well as a ready reference for non-specialist mixed or equine clinical practitioners

References ............................................... 59 Subject Index ............................................. 65 6 Introduction The retina as an organ of perception of light, colour, shape and movement has been the subject of numerous and intensive light- and electron-microscopical investigations. To date the interest in these has largely been concentrated on the structure of the ma ture retina and the genesis of its cellular elements. The first exhaustive observations on the development of the retina in vertebrates were made by Babuchin (1863). Using the retinae of chicken embryos, he showed that Millier's radial fibres and the ganglion cells are the first to develop, while the receptor segments are the last. Subsequently, the early differentiation of Millier's radial fibres was often reaffirmed (Cajal, 1893; Meller, 1968; Bhattacharjee and Sanyal, 1975; and others). Furthermore, Babuchin had already indicated that the structural development in the area of the posterior pole is very rapid compared with those regions of the retina which are situated more peripherally. Today, when comparing results of electron-mi croscopical investigations, this fact is of particular importance, since in each case only very limited areas of the retina can be examined. Schultze (1867a, b) pointed out the uniformity of origin and the general classifica tion of light-perceiving elements into inner and outer segments, thus contesting the hitherto generally held opinion that these structures, like the pigment epithelium, ori of the eye cup. In 1881 Ogneff discovered the analogous ginate from the outer leaf mode of formation in birds and mammals."

The placenta of the guinea-pig has assumed exceptional importance among the discoidal hemochorial placentae since the end of the sixties. Up to that date, numerous studies had been published on the functional analysis of the human placenta. One shortcom- ing common to all these studies, however, was the fact, that the human placenta was not absolutely suitable for morphological research, owing to fIxation difficulties, and for experimental investigations virtually unsuitable. Since other hemochorial villous placentae, like that of the anthropoid apes (primates) were practically unobtainable, a possible alternative was sought among the I;tcunal placentae. The numerous studies on the guinea-pig placenta undertaken at the turn of the century favoured the choice of this organ as it also belonged to the discoidal hemochorial type, like that of man. The fact that its structure was not villous but lacunal and therefore showed a different cir- culation seemed even advantageous in this case. The lacunal system facilitates differen- tiation in morphologically distinct areas, which allow independent functional analysis. The morphological and histochemical studies made during the past decade by Enders (1965), Vollrath (1965), Miiller and Fischer (1968), Kaufmann (1969a), Davidoff and Schiebler (1970a, b), King and Enders (1970b, 1971), Davidoff and Gospodinoff (1971), Davidoff (1973), Kaufmann (1974) have led to the discovery of a large amount of new information on this organ, thus rendering it one of the most precisely examined placentae so far.

This study has two related objectives. One is to improve our understanding of the sub- division of the parahippocampal cortex, the other is to investigate the terminal distri- bution of sulphide silver stainable fibre systems (explained below) in this region. The parahippocampal areas (comprising area entorhinalis, parasubiculum, area ret- rosplenialis e and presubiculum) transmit information to and from the hippocampus, a part of the brain which has been the subject of extensive neurobiological research. Much current anatomical work is therefore devoted to the study of the connections of the parahippocampal cortex (see Discussion), an activity which both requires and pro- vides more precise concepts of its subdivision. Recent studies have shown that histochemistry often brings out laminae and areas in this cortical region more clearly than do conventional morphological methods (Storm* Mathisen and Blackstad, 1964; Mellgren and Blackstad, 1967; Geneser Jensen and Blackstad, 1971; Geneser Jensen et aI., 1974 and references therein; Mellgren, 1973 a, b). The sulphide silver method, used here, is particularly valuable in this respect, as will be explained shortly.

References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 Subject Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 Author Index. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 . . . . . . . . . . . 6 Introduction Chondrification of the somitic mesoderm producing the primordia of the vertebrae has been a favourite topic of investigation by those interested in understanding the me chanisms underlying development and differentiation. Study of this tissue involves the investigation of cell proliferation, migration and cytodifferentiation, synthesis of extra cellular matricial products, inductive tissue interactions, and tissue morphogenesi- some of the major unsolved problems of modern developmental biology. The topic is a large one and various aspects have been reviewed in the past, notably by Holtzer (1959; 1961), Lash (1963a), Strudel (1967), Lash (1968a, c), Holtzer (1968), Holtzer and Abbott (1968), Holtzer and Mayne (1973) and Levitt and Dorfman (1974). Feel ing that the time was appropriate for a overview of the whole field of somitic chondro genesis, I have prepared the present monograph. It covers the development of experi mental studies from the initial grafting of somites to avian chorio-allantoic membranes in the 1920's, through the extirpation experiments of the 1940's, the culturing of the 1950's and the search for pure inducers, to the refocussing of attention on the environ ment and matrix procucts which is dominating the studies of the 1970's. Many of the studies have utilized the embryonic chick as the experimental animal."

Principles of Regenerative Medicine, Third Edition, details the technologies and advances applied in recent years to strategies for healing and generating tissue. Contributions from a stellar cast of researchers cover the biological and molecular basis of regenerative medicine, highlighting stem cells, wound healing and cell and tissue development. Advances in cell and tissue therapy, including replacement of tissues and organs damaged by disease and previously untreatable conditions, such as diabetes, heart disease, liver disease and renal failure are also incorporated to provide a view to the future and framework for additional studies.

The discovery of the reversible red far-red control of plant growth and development and the subsequent in vivo identification and isolation of the photoreceptor pigment, phyto chrome, constitutes one of the great achievements in modern biology. It was primarily a group of investigators at the Plant Industry Station, Beltsville, Mary land, headed by the botanist H.A. BORTHWICK and the physical chemist S.B. HENDRICKS, who made the basic discoveries and developed a theoretical framework on which the current progress in the field of phytochrome is still largely based. While the earlier development of the phytochrome concept has been covered by a num ber of excellent articles by the original investigators [104,105,33,238] as well as by others who joined the field of phytochrome research later [72, 109, 219], a comprehensive and up-to-date treatment of photomorphogenesis is not available at present. Since it seems to be needed for teaching as well as for researchers I have tried to summarize the present state of the field, reviewing the historical aspects of the phytochrome story only insofar as they are required to understand the present situation. The emphasis of my treatment will be on developmental physiology ("photomorphogenesis") rather than on phytochrome per se.