Toxic Substances in Crop Plants


Book Description

This volume reviews current knowledge of toxic substances in crop plants with particular reference to their anti-nutritional effects in animals and man and the potential for detoxification. The distribution and ecological significance of these compounds is also addressed. Continuing disquiet over the use of animal by-products in livestock nutrition has provided renewed impetus for the greater exploitation of conventional and novel crop plants both as food and as industrial raw materials. However, a major factor restricting the utilisation of such crops in animal nutrition is the presence of a diverse array of toxic substances capable of inducing effects ranging from loss of hair and wool to severe neurological disorders and even death. Significant advances have been made to establish the nature of these compounds and to assess their effects in animals and man. As in other branches of biomedical research, these developments have been achieved through the multidisciplinary efforts of chemists, biochemists, toxicologists, nutritionists and molecular geneticists. This volume reviews current knowledge of toxic substances in crop plants with particular reference to their anti-nutritional effects in animals and man and the potential for detoxification. The distribution and ecological significance of these compounds is also addressed.




Toxic Constituents of Plant Foodstuffs


Book Description

Toxic Constituents of Plant Foodstuffs focuses on toxic substances in foods of plant origin, including protease inhibitors, hemagglutinins, goitrogens, cyanogens, saponins, gossypol, lathyrogens, and allergens. The book also considers adventitious toxic factors in processed foods and miscellaneous toxic factors such as stimulants and depressants, hypoglycemic agents, toxic amino acids, metal-binding constituents, and hepatotoxins. This volume is organized into 13 chapters and begins with an overview of protease inhibitors, including their distribution in the plant kingdom, physical and chemical properties, and mechanism of interaction with proteases. The next chapters focus on the adventitious introduction of toxic factors into processed plant foods; the inactivation of the trypsin inhibitor and hemagglutinin found in legumes by cooking; and the extraction of a nontoxic, edible starch from cycads. The reader is also introduced to lathyrism, the toxicity of agglutinins, occurrence of goitrogens in thioglucoside-containing plants, and dietary sources of cyanogen. This book will be of interest and value to food scientists who are concerned with the safety of food supply and public health officials tasked with enforcing regulations necessary to ensure the safety of a particular food.




Pesticides in the Diets of Infants and Children


Book Description

Many of the pesticides applied to food crops in this country are present in foods and may pose risks to human health. Current regulations are intended to protect the health of the general population by controlling pesticide use. This book explores whether the present regulatory approaches adequately protect infants and children, who may differ from adults in susceptibility and in dietary exposures to pesticide residues. The committee focuses on four major areas: Susceptibility: Are children more susceptible or less susceptible than adults to the effects of dietary exposure to pesticides? Exposure: What foods do infants and children eat, and which pesticides and how much of them are present in those foods? Is the current information on consumption and residues adequate to estimate exposure? Toxicity: Are toxicity tests in laboratory animals adequate to predict toxicity in human infants and children? Do the extent and type of toxicity of some chemicals vary by species and by age? Assessing risk: How is dietary exposure to pesticide residues associated with response? How can laboratory data on lifetime exposures of animals be used to derive meaningful estimates of risk to children? Does risk accumulate more rapidly during the early years of life? This book will be of interest to policymakers, administrators of research in the public and private sectors, toxicologists, pediatricians and other health professionals, and the pesticide industry.




Toxic Chemicals Used in Agriculture


Book Description




Effects of Poisonous Plants on Livestock


Book Description

Effects of Poisonous Plants on Livestock documents the proceedings of a U.S.-Australian symposium on the effects of poisonous plants on domestic livestock. The symposium was held at Utah State University in Logan, Utah, on 19-24 June 1977. The volume is organized into eight parts. Part I discusses poisonous plant problems in the United States and Australia. Part II contains papers on general topics such as inorganic toxicants and poisonous plants; the hazard of plant toxicities to the human population; and selenium in plants as a cause of livestock poisoning. Part III examines the effects of simple phytotoxins such as selenium and oxalate on livestock. Part IV focuses on the effects of plant hepatotoxins, including pyrrolizidine alkaloids, Artemisia nova, and Tetradymia spp. Part V deals with plant cardio/pulmonary toxins such as Myoporum spp. and Pimelea spp. Part VI tales up plant neurotoxins while Part VII discusses plant teratogens and toxins affecting reproduction. Part VII presents studies on other toxic substances. It includes studies on oak poisoning and pine needle abortion in cattle.




Toxic Plants of North America


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.




Plant Toxins


Book Description




Chemical Remediation Studies for Al-Induced Toxicity in Crop Plants


Book Description

Phyototoxicity of aluminium is a serious problem limiting crop production on acid soils. Present studies on a crop plant Brassica juncea L. Czernj & Cosson exposed to Al elicited many visual symptoms, which were typical of mineral deficiency leading to loss of vigour. The ameliorative effect of Ca on Al toxicity was investigated on Brassica that involved an affordable and practical method to contain the toxicity through soil amendments with some salts of Ca, which is available locally and plentifully. It was found that a dose of 1200 g g-1 of Ca as calcium carbonate was sufficient to protect the crop from rhizotoxicity induced at 500 g g-1 of Al. A comparative pot-culture study of different salts of calcium was made to find out its most suitable anionic moiety. It was revealed that the salt of calcium carbonate worked the best, as it increased soil pH more than other two salts tested. Our study further revealed that Brassica plants irrigated with local tube-well water were free from Al-induced toxic effects even at much less of Ca-salt applied to the soil.




Chemical Pesticides Mode of Action and Toxicology


Book Description

Environmental-friendliness, issues of public health, and the pros and cons of genetically-modified crops all receive regular coverage in the world's media. This, in turn, has led to increased questioning and investigation of chemical pesticides. Stenersen's concise and timely introduction to chemical pesticides describes these compounds according to their mode of action at the cellular and biochemical level. Chemical Pesticides provides answers to questions such as why pesticides are toxic to the target organism and why pesticides are toxic to some organisms and not others. It describes how various poisons interfere with biochemical processes in organisms. The book also explores how resistance to pesticides develops, how resistance can be used to illustrate the theory of evolution, and how it can be used to produce herbicide-resistant crop plants. Legal matters and potential environmental problems are also discussed. By providing an integrated, yet simple description of modern chemical pesticides, the author provides a relevant text for professionals and students in biological disciplines such as biochemistry, medicine, agriculture, and veterinary science.




Toxicity of Houseplants


Book Description

This comprehensive volume discusses the various classes of toxic substances found in plants, and includes a series of monographs on specific species. Filled with figures and illustrations, this important reference presents information on clinical effects, the various common and botanic names, specific or class of toxin, case reports, mechanism of action, and risk assessment. The easy-to-read text provides a glossary of terms along with photographs of selected species. Everyone who comes into contact with plants will want this one-of-a-kind monograph at their fingertips. This resourceful book informs the non-botanist as well as health care practitioners, gardeners, poison center specialists, and nurserymen of the possible risks involving exposures to specific indoor plants.