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Elsevier

Libros en Ciencias Agrícolas y Biológicas

The Agricultural and Biological Sciences collection advances science-based knowledge for the improvement of animal and plant life and for secure food systems that produce nutritious, novel, sustainable foods with minimal environmental impact. Food Science titles include not only those products from agriculture but all other aspects from food production to nutrition, health and safety, chemistry to security, policy, law and regulation. Biological Sciences address animal behaviour and biodiversity, organismal and evolutionary biology, entomology, marine biology and aquaculture, plant science and forestry.

  • Horse Feeding and Nutrition

    • 2 Edición
    • Tony J. Cunha
    • Inglés
    This is the second edition of Horse Feeding and Nutrition which was originally published in 1980. It provides the latest information available for those interested in the feeding and nutrition of horses. This new edition has been entirely revised to include the large amount of new research information that has become available since publication of the first edition. Three new chapters have been added, entitled Feeding and Health-Related Problems, The Complexity of Proper Bone Formation, and Exercise Physiology. New feed and food crops, improved methods of production and processing, increased productivity of animals and crops, changes in animal products including more lean and less fat in meat and less fat in milk, longer shelf-life requirements of animal food products, and a myriad of new technological developments have resulted in a need to continually re-evaluate nutrient requirements and supplementation. Sample diets are given, useful as guides in developing diets for horses. Suggested levels of protein, minerals, and vitamins for use in horse diets are presented. These can be used as guides which can be modified to suit the various feeding situations encountered in horse farms. The volume of scientific literature is increasing rapidly each year. Moreover, its interpretation is becoming more complex. This increases the need for summarizing and interpreting these new developments in up-to-date books such as in this one.

  • Intermediary Nitrogen Metabolism

    • 1 Edición
    • Volumen 16
    • P. Michael Conn + 1 más
    • Inglés
    This volume covers the most significant advances of the last ten years in understanding intermediary nitrogen metabolism in plants. The eight chapters comprise aspects of nitrate and nitrogen assimilation, symbiotic nitrogen fixation, glutamine and glutamate enzymology, amino acid biosynthesis, ureides, and polyamine and sulfur metabolism. The volume emphasizes molecular and genetic advances as well as biochemistry and physiology. Intermediary Nitrogen Metabolism will be of interest to all plant biochemists and molecular geneticists who study nitrogen metabolism, enzymology, and amino acids.

  • Immunomodulation in Domestic Food Animals

    Advances in Veterinary Science and Comparative Medicine
    • 1 Edición
    • Bernald Charley
    • Inglés
    Immunomodulation in Domestic Food Animals covers the developments in the immunology and regulation of the immune response in domestic food animals. This book is organized into four parts encompassing 12 chapters that describe numerous factors affecting an immune response of animals and the management of these factors for food animal production. Part I provides an overview of the basic concepts of immunomodulation and the rationale for manipulating the immune response in food animals. Part II contains information on immunopotentiation using chemicals and a thorough discussion of adjuvant use. The molecular biology and in vivo use of cytokines in food animals is presented in Part III. Lastly, Part IV discusses physiologically regulated immunomodulation, including nutritional modulation of the immune response and neuroendocrine-immun... interactions. This book is of great value to immunologists, microbiologists, and feed scientists and researchers.

  • Dietary Fibre

    Chemical and Biological Aspects
    • 1 Edición
    • D A T Southgate + 3 más
    • Inglés
    Advances made in the last two decades have provided increasing insights into the chemical complexity of dietary fibre and this important book reviews the current state of knowledge on the role of fibre in the diet. It covers such areas as the chemistry of dietary fibre, health benefits to the consumer, effects on the small and large intestine, effect on lipid metabolism, implications to the industry and more…Dietary fibre: Chemical and biological aspects will prove essential reading for food chemists and technologists, nutritionists, biological scientist, clinicians, the food pharmaceutical industries, and regulatory bodies.

  • Advances in Marine Biology

    • 1 Edición
    • Volumen 26
    • Inglés
    Volume 26 of this important series will be of particular interest to fish biologists. Haug's review of Atlantic halibut presents a complete summary of this important species both as a subject of a pelagic fishery and a developing aquaculture industry. Kjorsvik and his colleagues focus on the importance of egg quality for the mass production of fish fry. They point to a number of characters that may be indicative of egg quality and which may help to assess their likelihood of producing good fry.****Neilson and Perry review the studies of diel movements in fish and conclude that they are often facultative in nature. The implications for fish sampling are discussed.****Finall... Burd and Nemec examine the development of practical approaches towards the methods of analyzing benthic infauna, pointing out the assumptions and limitations of each.

  • Advances in Botanical Research

    • 1 Edición
    • Volumen 17
    • Inglés
    This latest volume in the series focuses on evolution and palaeobotany, plant-microbe interactions, and biomechanics.Collins... reviews the Early Tertiary floras and presents new evidence on the evolution and diversification of land plants using computer analysis of plant assemblages and reconstructions of fossil plants and plant communities. Fries and Endress combine the skills of palaeobotanists and neobotanists to more closely examine the evolution and morphology of angiosperm flowers.Miller turns his attention to the bacteria symbiotic in the leaf nodules of plants. This most complex of relationships between bacteria and higher plants involves a close and lifelong interaction at the deepest cellular level and is a fascinating system only poorly understood as of yet. Vincent deals with the fracture properties of plants--an important subject both for the plant trying to survive in a hostile environment and for its implications for agriculture and the palatability of food.

  • Elsevier's Dictionary of Horticultural and Agricultural Plant Production

    In English, Dutch, French, German, Danish, Swedish, Italian, Spanish, Portuguese and Latin
    • 1 Edición
    • Jason Hort + 1 más
    • Inglés
    The first edition of this dictionary, Elsevier's Dictionary of Horticulture, edited by J. Nydam and A. de Jong was published in 1970. Since that time horticulture has expanded and developed spectacularly and the aim of this second edition is to meet a worldwide need to develop close contacts and to keep up with the developments in the horticultural world. Numerous terms have been introduced, covering a far broader field than the previous dictionary.Again English was chosen as the basic language and Portuguese has been added with Latin for the scientific names of organisms. Apart from the traditional subjects like vegetables, fruits, arboriculture, floriculture, mushrooms, crop science, plant breeding, botany and soil science, it now also includes tropical and subtropical horticulture, herbs and spices, landscaping, arable farming and grasses. More attention has been paid to market planning, economics, education, and extension and labour management. A number of terms relating to apiculture, meteorology and informatics have been introduced. Technology has been given more prominence, but so many new terms have been coined in this field that a selection had to be made. Regarding plant diseases, only general terms are mentioned; specific pests and diseases are not listed in view of the existence of specialized dictionaries. The same goes for weeds. A list of international organizations is included, with translations in English and French.

  • Soils on a Warmer Earth

    Effects of Expected Climate Change on Soil Processes, with Emphasis on the Tropics and Sub-Tropics
    • 1 Edición
    • Volumen 20
    • H.W. Scharpenseel + 2 más
    • Inglés
    The theme of this book is a far reaching one and should attract great interest, both in industrialized as well as in less developed countries. Although the question of climate change and its effects on soil productivity is overshadowed by so many current events, it is almost certain that this subject will remain on the international agenda for the years to come; not only as science and research are concerned but also in relation to development policies, agricultural policies and others, especially since poor, rich, developed and developing countries are equally threatened by these problems.

  • Biochemistry of Foods

    • 2 Edición
    • N.A. Michael Eskin
    • Inglés

  • Analysis of Wildlife Radio-Tracking Data

    • 1 Edición
    • Gary C. White + 1 más
    • Inglés
    With the substantial advances in the miniaturization of electronic components, wildlife biologists now routinely monitor the movements of free-ranging animals with radio-tracking devices. This book explicates the many analytical techniques and computer programs available to extract biological information from the radio tracking data.

  • Soil Micromorphology

    A Basic and Applied Science
    • 1 Edición
    • Volumen 19
    • L.A. Douglas
    • Inglés
    The book includes selected papers from those presented at the International Working Meeting on Soil Micromorphology in San Antonio, Texas, July 1988. Each section of the book is introduced with an invited plenary paper followed by selected contributed manuscripts. The volume is intended to give the reader insight into the more recent research work involving soil micromorphology and an evaluation of the present day state of the science. New applications of micromorphology to both lunar pedology and archeology are presented. Recently developed methods for staining of microorganisms and thin section fluorescence microscopy are presented. The volume presents a summary of the research findings of the major practitioners of soil morphology and will give the reader insight as to the present state of the discipline. New methods and techniques will be made available to the reader.The book is intended for students, practicing micromorphologists, soil scientists, geologists, and geomorphologists.

  • Physical Properties of Foods and Food Processing Systems

    • 1 Edición
    • M J Lewis
    • Inglés
    This book is an invaluable introduction to the physical properties of foods and the physics involved in food processing. It provides descriptions and data that are needed for selecting the most appropriate equipment in food technology and for making food processing calculations.

  • Vitamins and Minerals in Health and Nutrition

    • 1 Edición
    • M Tolonen
    • Inglés
    This book is an excellent introduction to the increasingly complex field of nutrition and health for food technologists and health professionals. It includes individual entries for all major vitamins, minerals and trace elements. Information is provided on nutritional medicine and cell protective mechanisms, together with the role of vitamins, minerals, trace elements and essential fatty acids in treating and preventing disorders.

  • Advances in Botanical Research

    • 1 Edición
    • Volumen 16
    • Inglés
    The latest volume in the series continues to serve botanists with a wide range of interests.

  • Aphids

    • 1 Edición
    • Volumen 2C
    • Bozzano G Luisa
    • Inglés

  • Interrelationships Between Microorganisms and Plants in Soil

    • 1 Edición
    • Volumen 18
    • Inglés
    These proceedings present the most up-to-date information on the interrelations between microorganisms and plants in the rhizosphere, and the possibility of utilizing these relationships to improve plant growth, health and yields. The application of some biological preparations may in the future partially replace the use of agrochemicals and thus contribute to environmental improvement and enhancement of the quality of soil, water and foodstuffs.The Symposium brought together specialists from fifteen countries to assess the advances in a field which has recently attracted considerable interest and is also important for society at large. The book contains over sixty contributions from rhizosphere microbiologists, focusing on the study of the function of microorganisms in the root system of crop plants and in its immediate vicinity, the effect of the plants themselves on this function, the interrelationships among different microorganisms in the rhizosphere and the elucidation of the mechanisms of microbial action in the agroecosystem. All these lines of research are intimately associated with the problems of soil fertility and crop yields, which in turn have a direct bearing on the nutrition of mankind and on environmental protection. The papers have been divided into four topics: symbiotic microorganisms in the root system; associative microorganisms in the root system; soil-borne phytopathogenic and phytotoxic microorganisms; and microbial preparations stimulating growth and improving the plant health. Each section starts with invited lectures from outstanding specialists. The work includes numerous tables, figures and references.The volume is primarily directed at soil microbiologists, plant pathologists and physiologists, ecologists as well as specialists in agronomy and environmental protection.

  • Advances in Marine Biology

    • 1 Edición
    • Volumen 25
    • Inglés
    Volume 25 of this authoritative review series continues the high standard set by the editors in the past. Marine biologists everywhere have come to value and enjoy the wide variety of thought-provoking papers written by invited experts.In this volume are reviews of four animal groups which span the entire range of the marine food chain. The role of parasites in ecology is a growing interest and the parasites of zooplankton are described in detail for the first time. Aspects of thegastropods, cephalopods and fish life are also examined in detail.

  • Advances in Agronomy

    • 1 Edición
    • Volumen 42
    • Inglés

  • Armored Scale Insects

    • 1 Edición
    • Volumen 4A
    • Bozzano G Luisa
    • Inglés
    This volume presents an up-to-date account of armored scale insects (Homoptera: Diaspididas), a family of highly specialized insects, many of which are important agricultural pests. Being sedentary, colonial and rather cryptic, many species have invaded new countries with important host plants. This has made them prime targets for biological control by natural enemies.No other book has attempted to present such a rounded picture of this important group. It covers all aspects: morphology, systematics, phylogeny, biology, ecology, natural enemies (pathogens, predators, parasites), pest status, control measures (quarantine, eradication, monitoring, chemical control, biological control, mechanical control, integrated control), as well as pest problems and control on specific crops, from a worldwide perspective.The armored scale insects: their morphology, systematics and phylogeny; reproductive biology and genetics; development biology and physiology; ecology; and techiques for their study is handled in Volume A.The book is intended for a broad audience: professional entomologists, extension specialists, pest control operators and advanced horticulturists and agriculturists, as well as biologists, naturalists and environmentalists (the latter should find the strong emphasis on natural enemies and biological control of interest).

  • Advances in Food Research

    • 1 Edición
    • Volumen 32
    • Inglés

  • Pesticide Chemistry

    • 1 Edición
    • Volumen 32
    • G. Matolcsy + 2 más
    • Inglés
    This book provides an overview of the major chemical aspects of pesticides giving detailed descriptions of the various groups of pesticides in current use - insecticides, acaricides, nematocides, rodenticides, fungicides and herbicides. The organic syntheses are discussed in detail, as are the biochemical aspects of the effectiveness and mechanisms of action of these chemical agents. The ecological aspects of the use of pesticides - nowadays an important consideration - are also discussed.The main trends of development in the field are also dealt with, e.g. the development of insecticides which present less of a threat to human beings and animals than the ones presently used, whose point of attack is the nervous system. Research is now concentrated on developing chemical compounds which affect the biochemistry or the special behavioural features of insects, instead of acting upon their nervous system. Newly discovered chemicals with selective action which are still in the developmental and experimentational stages are also described.Because of its comprehensive character, the book will be a useful source of information to those engaged in practical work in this field, as well as to researchers in the agricultural sciences.

  • Advances in Botanical Research

    • 1 Edición
    • Volumen 15
    • Inglés
    The latest volume in this series continues as a detailed review in botanical science to a wide audience. The papers in this volume are of general interest and present fascinating updates of important aspects of plant growth, physiology, and reproduction.

  • Advances in Insect Physiology

    • 1 Edición
    • Volumen 21
    • Inglés
    This latest volume in this series contains articles on a variety of insect physiological topics from the nervous system to the cuticle and circulatory system.

  • The Ecology of Social Behavior

    • 1 Edición
    • Bozzano G Luisa
    • Inglés
    The chapters in this book discuss and summarize the ecological factors affecting and effecting the formation of animal social groups and thereby address one of the central issues confronting researchers and students in sociobiology. The objectives are to review what is known about the impact of ecological factors in the formation and maintenance of social groups. Numerous examples have been drawn from a variety of phyla.

  • Advances in Food Research

    • 1 Edición
    • Volumen 31
    • Inglés

  • Advances in Agronomy

    • 1 Edición
    • Volumen 41
    • Inglés

  • Advances in Botanical Research

    • 1 Edición
    • Volumen 14
    • Inglés

  • Chemistry of Soil Organic Matter

    • 1 Edición
    • Volumen 17
    • K. Kumada
    • Inglés
    Despite the large number of papers and books published on soil organic matter (humus), our knowledge of the subject is still very limited, as is our knowledge of humic acid. The author of this book began to study humus at the end of the 1940s and continued until 1984 when he retired from Nagoya University. With the intention of establishing a systematic understanding of soil organic matter, he has compiled facts and a discussion of humus based on his extensive experimental results during the past 40 years.In this book, humic acids are classified into A, B, Rp and P types, based on their optical properties. The elementary composition and other chemical properties of humic acid types are shown to be regularly different from each other. A new method for humus composition analysis applied to various kinds of soils in Japan and several other countries indicates that the diversity of humus compositions of soils is systematically understandable. These findings lead the author to novel theories on the chemical configuration and formation of humic acids and humic substances. Diagenesis of humus under terrestrial conditions is illustrated as to the buried humic horizons of Black soil (Andosol).The book will be useful not only to soil scientists and agronomists but also to geochemists, oceanographers, limnologists, water scientists, biologists and chemists who are dealing with organic matter in terrestrial, aquatic, and sedimentary environments.

  • Trace Elements in Human and Animal Nutrition

    • 5 Edición
    • Walter Mertz
    • Inglés
    The major change in the format of the fifth edition is the presentation of the book in two volumes, necessitated by the rapidly increasing knowledge of metabolism, interactions, and requirements of trace elements. The guiding principle was to present the minimum of results that would serve as a logical foundation for the description of the present state of knowledge.

  • Advances in Marine Biology

    • 1 Edición
    • Volumen 24
    • Inglés

  • Advances in Ecological Research

    • 1 Edición
    • Volumen 17
    • Inglés

  • Laboratory Hamsters

    • 1 Edición
    • G. L. Van Hoosier Jr.
    • Inglés

  • Towards Holistic Agriculture

    A Scientific Approach
    • 1 Edición
    • R.W. Widdowson
    • Inglés
    This book explains the use of an ecological way of farming, with modern practical applications, to make the fullest use of land resources and the best utilization of available capital and labour. In analyzing the vital relationship between soil, plant, animal and man, the author discusses the best care of land itself, its components, grassland management and the most efficient use of crops to maximize yield, food quality and profitability without the extensive use of chemicals and without damaging the ecology. Widdowson also covers the holistic approach to animal farming, the welfare and health of poultry, cattle, sheep and goats, their nutritional needs through the various stages of their lives, and the best way to balance their diets.

  • Photosynthesis

    • 1 Edición
    • Volumen 15
    • J. Amesz
    • Inglés
    Photosynthesis is an active area of research in which many exciting developments have taken place in the last few years. This book gives an overview of the present understanding of all areas of molecular processes of photosynthesis. It is based on the international literature available in the summer of 1986 and much unpublished material. The new material contained in this book, together with a basic framework of established concepts, provide a useful source of reference on the biochemical and biophysical aspects of photosynthesis in plants and bacteria. The book is written by specialists in the various areas of photosynthesis and is useful both for workers in these areas as a source of specialized information as well as for non-photosynthesists who want to become informed about recent developments and basic concepts in this area.

  • Antarctica: Soils, Weathering Processes and Environment

    • 1 Edición
    • Volumen 16
    • I.B. Campbell + 1 más
    • Inglés

  • Remote Sensing in Soil Science

    • 1 Edición
    • Volumen 15
    • M.A. Mulders
    • Inglés
    This book provides comprehensive coverage of remote sensing techniques and their application in soil science. A clear, step-by-step approach to the various aspects ensures that the reader will gain a good grasp of the subject so that he can apply the techniques to his own field of study.The book opens with a thorough introduction to the physical aspects of electromagnetic radiation and the technical aspects of remote sensing and image processing. This is followed by a discussion of the methods for interpreting remote sensing data, and their application to soils, vegetation, and land as a whole.As the interpretation of soil conditions is based on many aspects (i.e. soil surface, vegetation, land use, land form), the scope of the book is correspondingly broad. It will therefore provide much useful information for students and scientists in soil science, geography, geology, hydrology, ecology, agriculture and civil engineering.

  • Advances in Botanical Research

    • 1 Edición
    • Volumen 13
    • Inglés

  • Food Emulsions and Foams

    • 1 Edición
    • E. Dickinson
    • Inglés
    This text explains how properties of the system are affected by such factors as the crystallisation of the fat, the surface behaviour of the proteins, and presence of various small molecules and ions in the aqueous phase.

  • Food Structure

    Creation and Evaluation
    • 1 Edición
    • J. R. Mitchell + 1 más
    • Inglés
    The book considers fundamental concepts and discusses dispersed food systems such as gels, emulsions and foams and chemical properties of food polymers. It examines structured food systems such as fibrous and non-fibrous systems, and concludes with and evaluation of food structure by microscopic, rheologic and sensor means.

  • Plant Polymeric Carbohydrates

    • 1 Edición
    • F Meuser + 2 más
    • Inglés
    The International Symposium on Plant Polymeric Carbohydrates, which was held as a satellite symposium of the International Carbohydrate Meeting, has become a symposium in its own right, bringing together an number of experts to exchange knowledge. This has been achieved by placing the emphasis on specific aspects of carbohydrate research in the selection and organization of the items on the programme. The aim of the symposium was to present the latest research in sub-branches of the biosynthesis and structure of polymeric carbohydrates, their rheological properties, both as pure substances and in complex bonds with other natural materials, their nutritional importance with respect to their physicochemical and nutritive properties, and their industrial applications in food and non-food.

  • Advances in Marine Biology

    • 1 Edición
    • Volumen 23
    • Inglés

  • Advances in Agronomy

    • 1 Edición
    • Volumen 40
    • Inglés

  • Advances in Food Research

    • 1 Edición
    • Volumen 30
    • Inglés

  • Trace Elements in Human and Animal Nutrition

    Volume 2
    • 5 Edición
    • Inglés
    The major change in the format of the fifth edition is the presentation of the book in two volumes, necessitated by the rapidly increasing knowledge of metabolism, interactions, and requirements of trace elements ... The guiding principle was to present the minimum of results that would serve as a logical foundation for the description of the present state of knowledge. Recent results of research were accommodated by devoting new chapters to the subjects "Methodology of Trace Element Research" and "Quality Assurance for Trace Element Analysis" and by expanding the discussion of lithium and aluminum in separate, new chapters. The first two subjects are of outstanding importance as determinants of future progress. The concern for the quality of analytical data motivated the authors of the individual chapters to review critically and, where necessary, revise analytical data presented in the previous editions. The rapid progress of trace analytical methodology since the mid-1970s has changed what had been accepted as normal for the concentrations of many trace elements in tissues and foods. The new data reflect the present state of the art in trace element analysis, but they may be subject to future revision.

  • Spider Mites

    • 1 Edición
    • Volumen 1B
    • Bozzano G Luisa
    • Inglés
    This two-part volume with contributions from more than 50 international specialists, provides an up-to-date text and brings together facts and views of acarologists specialized in various aspects of the biology of spider mites. The need for such a treatment of scientific progress and recommended topics for future research exists among students, commencing in the study of acarology and plant protection, as well as among those engaged in acarological research and teaching. Both books will serve to provide a synthesis of much of the knowledge on basic and applied aspects of the biology of spider mites and their natural enemies; stimulate students to analyse critically the views propounded by the authors of the book, and instigate research into environmentally safe and cost effective means of pest control.

  • Nitrogen and Energy Nutrition of Ruminants

    • 1 Edición
    • Inglés
    This comprehensive volume examines the interrelationships of nitrogen and energy nutrition of ruminants. It provides exhaustive coverage of basic concepts, applications, and new research developments.Rumen microbial activity is emphasized. The author, an expert in animal nutrition, discusses new systems of determining dietary energy requirements, the effect of processing feedstuffs, and stress factors. He reviews the availability of nutrients in grains, distillers' grain residues, oilseed meals, molasses, silages, pastures, crop residues, and aquatic plants. Growth stimulants, nutritional management of ruminants in feedlots and pastures, and the value of feed additives are also among the topics considered.The scope of coverage provided by this volume will make it the leading reference for teachers, researchers, consultants, livestock producers, feed manufacturers, and all others who are involved in ruminant feeding and nutrition.From the Preface: This volume covers research on various nitrogen and energy feedstuffs and defines terminology commonly utilized in nitrogen and energy nutrition. The utilization of nitrogen and energy in oilseed meals, fish meals, cereal grains, distillers' residues, molasses, silages, grasses, hays, crop residues, animal waste, and nonprotein nitrogen sources is discussed. Details are given on development and utilization of net energy systems, systems for balancing total nitrogen, and nonprotein nitrogen with total digestible nutrients (TDN) or energy components of ruminant diets. Discussions are presented on metabolism, feedlot, milking, and grazing trials. Growth stimulants, processing of feedstuffs, type of animal, and environmental and management factors that affect feed intake, growth, feed efficiency, and quality of product are reviewed.Emphasis is given to the contributions of ruminal microbes in upgrading forage and nonprotein nitrogen sources to higher-quality bacterial protein, as well as their ability to downgrade high-quality protein and waste nitrogen when protein is fed in excess of microbial needs. Research is presented on means to increase bypassing of the rumen to prevent nitrogen wastage when ruminants are fed concentrate diets. Contributions of ruminal microbes in utilizing cellulosic materials as lignocellulose and hemicellulose as well as starch and other carbohydrates are discussed.

  • Advances in Botanical Research

    • 1 Edición
    • Volumen 12
    • Inglés
    Advances in Botanical Research provides an up-to-date source of information for students, lecturing staff and research workers in plant sciences. The topics discussed in Volume 12 span a wide area, ranging from the biochemical mechanisms involved in the light modulation of enzyme activity, to the phylogenetic significance of the dinoflagellate chromosome. This series specializes in articles evaluating particular areas of advanced botany and as such continues to be of interest to botanists in a variety of research areas.From the Preface:The changes in enzyme activity in green plants caused by the transition from light to dark are now regarded as important regulatory processes directing metabolism towards synthesis of sugars and storage compounds in the light, and their breakdown in the dark. Light affects chloroplast enzyme activity in a number of diverse ways, through alteration of stromal pH, ion and metabolite levels. However, there are also changes in activity in some enzymes that involve post-translation (probably covalent) modification of the enzyme protein, and these are generally referred to as 'light modulation'. In her article, Anderson reviews such plant enzyme systems, the biochemical mechanisms involved (probably by reduction of a disulphide bond), their potential molecular basis and the function of modulation in photosynthetic carbon metabolism.One of the most important developments in plant molecular genetics is the rapid improvement of our understanding of the nature and mechanisms of mutation induced by transposable elements. It is interesting to reflect that the origins of this lie in our fascination for variegated plants as horticultural curiosities! Because of our increasing interest in transposable elements for exploring the genetic origins of variation, or as systems for molecular biology and genetic engineering, the review of Plant Transposable Elements by the group at the Max-Planck Institute, K"ln (Nevers, Shepherd and Saedler) is particularly welcome. How transposons will be used to isolate genes known only for their phenotypic effects will be seen in the future.The unicellular dinoflagellates are major components of marine and freshwater ecosystems. Apart from their general ecological importance, there are a number of reasons why they are of interest to biologists. In this volume we consider two such aspects. The article by Sigee discusses the very high level of DNA possessed by these organisms, the particular configuration of their chromatin and their nuclear organisation. These are of phylogenetic significance, and to summarise the position as presented in Sigee's article, it now seems that dinoflagellates are to be regarded as true eukaryotes with some prokaryote features, and that probably they are 'primitive' rather than degenerate forms of more advanced ancestors.Algae that can produce toxins effective against animals are found in three of the eight algal divisions, including the dinoflagellates. Carmichael reviews various apsects of biology and chemistry of these chemically diverse toxins, some of which can exert potent effects on humans, and considers their potential natural role. Few ideas of such ecological roles appear to have been subject to critical experimentation, and this article should provide a framework for such future work.

  • Advances in Agronomy

    • 1 Edición
    • Volumen 38
    • Inglés

  • Cell Growth, Nutrition, Cytodifferentiation, and Cryopreservation

    • 1 Edición
    • Indra Vasil
    • Inglés

  • Soil Physics with BASIC

    Transport Models for Soil-Plant Systems
    • 1 Edición
    • Volumen 14
    • G.S. Campbell
    • Inglés
    This book covers material taught in a graduate-level soil physics course at Washington State University. While most soil physics courses dwell mainly on deriving rather than solving the differential equations for transport, the author's approach is to focus on solutions. Graduate students in agricultural and biological sciences usually have a good working knowledge of algebra and calculus, but not of differential equations. In order to teach methods for solving very difficult differential equations with difficult boundary conditions using fairly simple mathematical tools, the author uses numerical procedures on microcomputers to solve the differential equations. Numerical methods convert differential equations into algebraic equations which can be solved using conventional methods of linear algebra.This book reflects the philosophy used in the course. Each chapter introduces soil physics concepts, generally in the conventional way. Most chapters then go on to develop simple computer programs to solve the equations and illustrate the points made in the discussion. Problems at the end of each chapter help the reader practice using the concepts introduced in the chapter. The problems and computer programs are an integral part of the presentation, and readers are strongly encouraged to experiment with each model until both the working of the model and the concepts it teaches are familiar. Although the programs are generally short and relatively simple, they are suitable for use as submodels in large, general-purpose models of the soil-plant-atmospher... system, and have been used in this way by the author and by several of his students.Teachers and students alike will welcome this new textbook. It will enable graduate students to understand and solve transport problems which exist in field situations, and will provide them with a good working knowledge of soil physics - fundamental to so many other areas in soil, plant and engineering sciences.

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