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Author: John Tor-Agbidye Publisher: ISBN: Category : Lolium perenne Languages : en Pages : 246
Book Description
Endophytic fungi (A. coenophialum and A. lolii) which infect grasses produce ergot alkaloids that serve as the grasses' chemical defenses and enhance the vigor of the grass. Turf-type tall fescue with high endophyte levels has been deliberately developed to produce a greener, more vigorous, pest-resistant turf. Consumption of endophyte-infected grass causes various toxicity symptoms in livestock. Cattle in the southeastern and midwestern United States, where tall fescue is grown on 14 million hectares, often develop signs of toxicosis during summer months from grazing plants in fected by A. coenophialum. A more severe form of the disease, fescue foot, has been associated with cold environment and reported in late fall and winter months not only in the southeastern United States but also in the northwest United States. In New Zealand, where perennial ryegrass is grown on 7 million hectares of pasture, sheep often develop a condition called ryegrass staggers from grazing plants infected by A. lolii. New Zealand reports economic losses grazing plants infected by A. lolii. New Zealand reports economic losses associated with the sheep industry of $205 million per year. In the United States, economic losses associated with the beef cattle industry alone is estimated at $600 million per year. Range finding experiments and case studies of fescue foot and perennial ryegrass staggers (PRGS) were conducted on cattle and sheep under grazing and barn conditions. The main objective was to determine threshold levels of the endophyte toxins, ergovaline (EV) (appendix 1) and lolitrem B (appendix 2), associated with the diseases of fescue foot and PRGS respectively. Fescue foot was experimentally induced in cattle under barn studies in the spring with 825 ppb ergovaline. The ergovaline contaminated feed was given for a period of 42 days. Similar barn studies in sheep in spring to early summer did not produce clinical fescue foot with up to 1215 ppb. Field studies of natural fescue foot in a herd of sheep were conducted, (ie 540 ppb) values of ergovaline in the feed, but clinical disease was not produced in late fall through winter. A case study from a herd of sheep revealed 813 ppb dietary ergovaline had produced fescue foot in the months of fall (November). Fields of perennial ryegrass (PRG) where sheep received 2,135 ppb lolitrem B toxin were associated with clinical cases of PRGS in 42 sheep of 237 sheep (18 percent incidence rate) in the Willamette Valley of Oregon. Three months later, sheep on this same field which then had 1,465 ppb lolitrem B, did not have PRGS. These were the first range finding experiments undertaken in this locale to document threshold levels of endophyte toxins associated with fescue foot and PRGS.
Author: John Tor-Agbidye Publisher: ISBN: Category : Lolium perenne Languages : en Pages : 246
Book Description
Endophytic fungi (A. coenophialum and A. lolii) which infect grasses produce ergot alkaloids that serve as the grasses' chemical defenses and enhance the vigor of the grass. Turf-type tall fescue with high endophyte levels has been deliberately developed to produce a greener, more vigorous, pest-resistant turf. Consumption of endophyte-infected grass causes various toxicity symptoms in livestock. Cattle in the southeastern and midwestern United States, where tall fescue is grown on 14 million hectares, often develop signs of toxicosis during summer months from grazing plants in fected by A. coenophialum. A more severe form of the disease, fescue foot, has been associated with cold environment and reported in late fall and winter months not only in the southeastern United States but also in the northwest United States. In New Zealand, where perennial ryegrass is grown on 7 million hectares of pasture, sheep often develop a condition called ryegrass staggers from grazing plants infected by A. lolii. New Zealand reports economic losses grazing plants infected by A. lolii. New Zealand reports economic losses associated with the sheep industry of $205 million per year. In the United States, economic losses associated with the beef cattle industry alone is estimated at $600 million per year. Range finding experiments and case studies of fescue foot and perennial ryegrass staggers (PRGS) were conducted on cattle and sheep under grazing and barn conditions. The main objective was to determine threshold levels of the endophyte toxins, ergovaline (EV) (appendix 1) and lolitrem B (appendix 2), associated with the diseases of fescue foot and PRGS respectively. Fescue foot was experimentally induced in cattle under barn studies in the spring with 825 ppb ergovaline. The ergovaline contaminated feed was given for a period of 42 days. Similar barn studies in sheep in spring to early summer did not produce clinical fescue foot with up to 1215 ppb. Field studies of natural fescue foot in a herd of sheep were conducted, (ie 540 ppb) values of ergovaline in the feed, but clinical disease was not produced in late fall through winter. A case study from a herd of sheep revealed 813 ppb dietary ergovaline had produced fescue foot in the months of fall (November). Fields of perennial ryegrass (PRG) where sheep received 2,135 ppb lolitrem B toxin were associated with clinical cases of PRGS in 42 sheep of 237 sheep (18 percent incidence rate) in the Willamette Valley of Oregon. Three months later, sheep on this same field which then had 1,465 ppb lolitrem B, did not have PRGS. These were the first range finding experiments undertaken in this locale to document threshold levels of endophyte toxins associated with fescue foot and PRGS.
Author: David R Gang Publisher: Springer Science & Business Media ISBN: 1461440661 Category : Science Languages : en Pages : 179
Book Description
This is the second volume since the reintroduction of the Recent Advances in Phytochemistry (RAP) series, an annual journal supported by the Phytochemical Society of North America. Topics appropriate for RAP include the biosynthesis of natural products and regulation of metabolism, the ecology of specialized metabolites and the evolution of their pathways, and the effects of natural products or plants on human health. Research appropriate for RAP involves genomics, proteomics, metabolomics, natural product structural determination and new technology development, medicinal chemistry and metabolic engineering, or any of the myriad of fields that are now closely associated with what may be called “traditional phytochemistry” and plant biochemistry. The advent of post-genomics-based ways of thinking, of systems biology, of synthetic biology, of comparative genomics/ proteomics/ transcriptomics/ metabolomics and especially of the introduction and establishment of a mentality that leads to support of large collaborative projects, has opened up many new doors to scientists interested and versed in the (bio)chemistry of plants. The goal of RAP is to highlight these developments. Two main types of articles are printed in RAP: Perspectives and Communications. Perspectives in RAP are expected to synthesize results from the primary literature and perhaps from new/novel results and place these in perspective relative to the broader field. These articles may be similar to review articles, but also are intended to present important ideas and hypotheses, and may present proposals for interesting directions in the field. It is the hope of the Editorial Board that these articles will be of great value to a large audience. Communications are intended to represent new advances in the field that will be of interest to a large audience. Articles of both types are typically solicited from the Society membership based on the content of the annual meeting talks, but in keeping with the title “Recent Advances in Phytochemistry” the editorial board reserves the right to solicit additional Perspectives and/or Communications from non-attendees as well (e.g., where an editorial board member has knowledge of an interesting recent advancement that would be of general interest to the society membership). All submissions to RAP go through a rigorous peer review process, overseen by the Editorial Board, which includes external review. RAP is indexed with Springer published journals. All RAP papers are available not only in the published volume form, but also electronically through Springer’s online literature services. This marks a significant change from past volumes of RAP and it is the hope of the Editorial Board that this will lead to broader dissemination of the contents of and greater interest in RAP. This 42nd volume of RAP includes a total of seven articles, many, but not all, based on talks presented at the 50th annual meeting of the PSNA. As was seen in RAP volume 41, These seven Perspectives give a very good picture of the breadth of plant (bio)chemistry research in North America, which is also indicative of the state of the field worldwide. Each of these articles describes the integration of several different approaches to ask and then answer interesting questions regarding the function of interesting plant metabolites, either in the plant itself or in interactions with the environment (natural setting or human health application). Many of these Perspectives have a strong ecological focus. McCormick et al. review the discovery of the biosynthetic pathway leading to production of trichothecene mycotoxins such as the T-2 toxin in plant pathogenic and other fungi. These compounds play very important roles in plant-pathogen interaction, and are very significant from a human health perspective. In a complementary paper, Duringer et al. describe recent technological advances in monitoring mycotoxins such as ergovaline and lysergic acid in forage crops, using state of the art and highly sensitive mass spectrometric means. Gross reviews the current understanding of how infochemicals mediate interactions between plants and insects, and highlights how such knowledge can be used to mitigate crop losses by pests. Two Perspectives discuss how recent technological advances are making an impact on our understanding of the role of plant hormones in plant growth and development. Gouthu et al. outline highly sensitive methods for measurement of plant hormones in tissues such as developing grape berry. In contrast, McDowell and Gang outline how new transcriptional profiling techniques are shedding light on old questions, such as how rhizome development is regulated by different plant growth regulators. The last two Perspectives outline the role of biotechnology in modern plant biochemistry research. Makhzoum et al. review the long history of use of hairy roots and provide perspective on future utility of this tissue type in continuing to uncover mechanisms of plant natural product biosynthesis, among other apolications. Dalton et al. outline, on the other hand, recent efforts to produce non-native polymers of human interest in plants and outline many of the challenges associated with such investigations. We hope that you will find these Perspectives to be interesting, informative, and timely. It is our goal that RAP will act not only as the voice of the PSNA, but that it will serve as an authoritative, up-to-date resource that helps to set the gold standard for thought and research in fields related to plant biochemistry.
Author: Vijay C. Verma Publisher: Springer Science & Business Media ISBN: 8132215753 Category : Science Languages : en Pages : 460
Book Description
In recent years there has been significant attention paid on the endophytic research by various groups working within this domain. Mutualistic endophytic microbes with an emphasis on the relatively understudied fungal endophytes are the focus of this special book. Plants are associated with micro-organisms: endophytic bacteria and fungi, which live inter- and intra-cellularly without inducing pathogenic symptoms, but have active biochemical and genetic interactions with their host. Endophytes play vital roles as plant growth promoters, biocontrol agents, biosurfactant producers, enzymes and secondary metabolite producers, as well as providing a new hidden repertoire of bioactive natural products with uses in pharmaceutical, agrochemical and other biotechnological applications. The increasing interest in endophytic research generates significant progress in our understanding of the host-endophyte relationship at molecular and genetic level. The bio-prospection of microbial endophytes has led to exciting possibilities for their biotechnological application as biocontrol agent, bioactive metabolites, and other useful traits. Apart from these virtues, the microbial endophytes may be adapted to the complex metabolism of many desired molecules that can be of significant industrial applications. These microbes can be a useful alternative for sustainable solutions for ecological control of pests and diseases, and can reduce the burden of excess of chemical fertilizers for this purpose. This book is an attempt to review the recent development in the understanding of microbial endophytes and their potential biotechnological applications. This is a collection of literature authored by noted researchers having signatory status in endophytic research and summarizes the development achieved so far, and future prospects for further research in this fascinating area of research.
Author: George E. Burrows Publisher: John Wiley & Sons ISBN: 0813820340 Category : Medical Languages : en Pages : 1391
Book Description
Toxic Plants of North America, Second Edition is an up-to-date, comprehensive reference for both wild and cultivated toxic plants on the North American continent. In addition to compiling and presenting information about the toxicology and classification of these plants published in the years since the appearance of the first edition, this edition significantly expands coverage of human and wildlife—both free-roaming and captive—intoxications and the roles of secondary compounds and fungal endophytes in plant intoxications. More than 2,700 new literature citations document identification of previously unknown toxicants, mechanisms of intoxication, additional reports of intoxication problems, and significant changes in the classification of plant families and genera and associated changes in plant nomenclature. Toxic Plants of North America, Second Edition is a comprehensive, essential resource for veterinarians, toxicologists, agricultural extension agents, animal scientists, and poison control professionals.
Author: Wanda M Haschek Publisher: Academic Press ISBN: 0124157653 Category : Medical Languages : en Pages : 3055
Book Description
Haschek and Rousseaux's Handbook of Toxicologic Pathology is a key reference on the integration of structure and functional changes in tissues associated with the response to pharmaceuticals, chemicals and biologics. The 3e has been expanded by a full volume, and covers aspects of safety assessment not discussed in the 2e. Completely revised with many new chapters, it remains the most authoritative reference on toxicologic pathology for scientists and researchers studying and making decisions on drugs, biologics, medical devices and other chemicals, including agrochemicals and environmental contaminants. New topics include safety assessment, the drug life cycle, risk assessment, communication and management, carcinogenicity assessment, pharmacology and pharmacokinetics, biomarkers in toxicologic pathology, quality assurance, peer review, agrochemicals, nanotechnology, food and toxicologic pathology, the environment and toxicologic pathology and more. - Provides new chapters and in-depth discussion of timely topics in the area of toxicologic pathology and broadens the scope of the audience to include toxicologists and pathologists working in a variety of settings - Offers high-quality and trusted content in a multi-contributed work written by leading international authorities in all areas of toxicologic pathology - Features hundreds of full color images in both the print and electronic versions of the book to highlight difficult concepts with clear illustrations
Author: Bradford P. Smith Publisher: Elsevier Health Sciences ISBN: 032355444X Category : Medical Languages : en Pages : 2279
Book Description
**Selected for Doody’s Core Titles® 2024 with "Essential Purchase" designation in Veterinary Medicine** Utilize a problem-oriented approach to the diagnosis of diseases of horses, cattle, sheep, and goats. Large Animal Internal Medicine, 6th Edition covers the diagnosis and management of disease in both ruminant and equine internal medicine. As the first veterinary internal medicine text to use a problem-based approach, it offers discussions of over 150 clinical signs and manifestations, as well as comprehensive coverage of laboratory and diagnostic testing. New to this edition is a versatile online reference platform and coverage of conditions that exist in Europe, Central and South America, Australia, and New Zealand. In addition, thoroughly revised and updated content includes new vaccines and vaccination protocols; the most current laboratories for DNA, genetic, and PCR testing; and colostrum supplements and replacers. It’s everything you need to stay up to date with the latest information on preventing and treating disease in large animals. Discussions of over 150 clinical signs or manifestations of disease provide you with a problem-based approach to diagnosis based on what you’ve observed and what laboratory tests reveal. Causes of Presenting Signs boxes offer quick access to the common, less common, and uncommon diseases associated with manifestations or signs of disease. Causes of Abnormal Laboratory Values boxes highlight the possible interpretations of abnormalities in clinical chemistry, hematology, blood proteins, and clotting tests. More than 200 expert authors contribute information in their areas of expertise for the most current, authoritative information on each topic. NEW! Expert Consult platform provides a versatile digital resource including bonus content, useful references, and videos to meet the needs of practicing equine and large animal veterinarians. NEW! Global conditions of importance are covered, including those previously not discussed, that exist in Europe, Central and South America, Australia, and New Zealand. NEW! Coverage of emerging and re-emerging diseases includes the new pathogen discovery. NEW! Assessment of vaccination status and susceptibility to infection discusses how antibody titers can predict protection for some pathogens. NEW! Description of epigenetics and metagenomics provides detailed coverage of these emerging areas of interest. NEW! Table of zoonoses obtained from large animals includes symptoms and disinfection needs. NEW! Videos demonstrate how to perform ultrasound imaging on an equine and cow abdomen clearly showing where to position the probe, and what depth to use for scans of the kidneys, liver, and bowel. NEW! Coverage of genetic disorders, Hydrocephalus in Fresians and Pulmonary hypoplasia with Anasarca in Dexter cattle help you to treat these disorders. NEW! Extensively updated content clarifies the latest research and clinical findings on the West Nile Virus, therapeutic drug monitoring, muscle disorders, GI microbiota, the genetic basis for Immune-mediated myositis in Quarter Horses, discoveries in antimicrobial drugs, anthelmintic, and vaccines, and more!
Author: Pradeep Kumar Publisher: CRC Press ISBN: 1000818292 Category : Technology & Engineering Languages : en Pages : 429
Book Description
Mycotoxins represent an assorted range of secondary fungal metabolites that extensively occur in numerous food and feed ingredients at any stage during pre- and post-harvest conditions. Mycotoxin contamination in food and feed cause acute and chronic mycotoxicosis, including teratogenic, carcinogenic, oestrogenic, neurotoxic, and immunosuppressive effects and several others health issues. Mycotoxins in Food and Feed presents an overview of all the major mycotoxins, sources of production, chemistry and biosynthesis, occurrence in food and feed, effect on agriculture, effect on human health, detection technique, masked mycotoxins, and management and control strategies. Key Features Provides broad coverage of mycotoxins and their effects on food and feed Includes comprehensive information of occurrence, chemistry, detections methods and management strategies for each toxin Discusses the recent development in detection technologies for major mycotoxins Explores agricultural practices and post-harvest management strategies for managing mycotoxin infestations
Author: Konnie Plumlee Publisher: Elsevier Health Sciences ISBN: 0323058345 Category : Medical Languages : en Pages : 495
Book Description
This book covers all aspects of toxicology, including toxic diseases of large animals, small animals, and exotic pets. It provides key information on how poisons affect the body, how the body responds to a foreign substance, how poisonings are diagnosed, and how poisonings are treated. Coverage includes every organ system of every species of animal with details on each body system's susceptibility to poison. Poisons affect animals differently depending on species, breed, age, gender, health status, and reproductive status. This resource addresses these differences, allowing the veterinarian to determine the class of toxicant, the mechanism of action, and the proper course of treatment. If confronted with an unknown poison, the information in this book will assist the veterinarian in formulating a list of potential poisons based on the clinical signs that the animal is exhibiting, and in choosing the appropriate tests to narrow the list to one or a few possible poisons. - Most comprehensive toxicology book available - Written in a user-friendly style that makes it easy to master the content - Covers poisonings in both large and small domestic animals - The Principles of Toxicology section provides comprehensive coverage of concepts & terminology, toxicokinetics, treatments, and regulatory information - The Manifestations of Toxicoses section is devoted to differentiating between poisons based on lesions and clinical signs - The Classes of Toxicants section offers detailed information on each poison, including sources, risk factors, pathophysiology, clinical signs and lesions, diagnostic testing, and treatment - The author is board-certified in toxicology, and the contributors are all toxicologists and educators, ensuring authoritative, up-to-date clinical information
Author: Stephen C. Bishop Publisher: CABI ISBN: 1845935551 Category : Technology & Engineering Languages : en Pages : 370
Book Description
Addressing principles associated with breeding animals for enhanced health and resistance to specific diseases, this book provides a review of the field illustrated with examples covering many diseases of importance to livestock production, across all major livestock species. Authored by experts in the field, this updated edition covers techniques and approaches, viruses, TSEs, bacteria, parasites, vectors, and broader health issues seen in production systems, including metabolic diseases. The book will be an essential reference for professionals in the field, scientists and researchers, students, breeders, veterinarians, agricultural advisors and policy makers.
Author: John Tor-Agbidye
Author: John Tor-Agbidye
Author: David R Gang
Author: Vijay C. Verma
Author: George E. Burrows
Author: 
Author: Wanda M Haschek
Author: Bradford P. Smith
Author: Pradeep Kumar
Author: Konnie Plumlee
Author: Stephen C. Bishop