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Author : Byron E. Butterworth
Publisher : Unknown
Page : 170 pages
File Size : 42,9 Mb
Release : 1979
Category : Medical
ISBN : UCAL:B4456694
Author : Byron E. Butterworth
Publisher : Unknown
Page : 128 pages
File Size : 45,5 Mb
Release : 1979
Category : Electronic
ISBN : OCLC:476410469
Author : Anne Trontell
Publisher : Unknown
Page : 40 pages
File Size : 51,5 Mb
Release : 1979
Category : Carcinogenicity testing
ISBN : UOM:39015041308043
Author : H.F. Stich,R.H.C. San
Publisher : Springer
Page : 518 pages
File Size : 51,8 Mb
Release : 2011-10-08
Category : Medical
ISBN : 1461258499
The recent surge of interest in designing, validating, and implementing short-term tests for carcinogens has been spurred by the fairly convincing correlation be tween the carcinogenicity and mutagenicity of chemicals and physical agents and by the assumption that DNA alteration, mutations, and chromosome aberrations are somehow involved in neoplastic transformation. Moreover, it has been tacitly assumed that the mutagenic capacity alone of compounds would induce regulatory agencies to pass rules for their removal from the environment and would lead the public to avoid them. The actual response, however, is quite different. Governmental departments shy away from making any decisions on the basis of in vitro test systems. The public at large is becoming irritated by daily an nouncements that many of their cherished habits could adversely affect their health. Industry appears to feel threatened and may reduce its search for new beneficial chemicals. The reluctance to accept wholeheartedly the mutagenicity tests for the detection of carcinogens is partly due to uncertainty about the in volvement of mutations in neoplastic transformation, partly due to the present difficulty of extrapolating results from various endpoints obtained on numerous organisms to man, and partly due to a multitude of complex events that lead in vivo to the evolvement of benign or malignant tumors.
Author : Anne Trontell
Publisher : Unknown
Page : 36 pages
File Size : 42,8 Mb
Release : 1979
Category : Carcinogenicity testing
ISBN : UCR:31210012791180
Author : John Ashby
Publisher : Unknown
Page : 472 pages
File Size : 52,8 Mb
Release : 1988
Category : Medical
ISBN : CORNELL:31924050734106
Author : Byron E. Butterworth
Publisher : Unknown
Page : 168 pages
File Size : 52,5 Mb
Release : 1979
Category : Medical
ISBN : UOM:39015004350883
Author : J. F. Douglas
Publisher : Springer Science & Business Media
Page : 339 pages
File Size : 44,7 Mb
Release : 2012-12-06
Category : Medical
ISBN : 9781461251644
Cancer has become the most critical health problem in the United States. It is expected that 25% of the people will develop this dread disease, and many of these will die from the malady. The causes of cancer are varied, but the best estimate available is that 70--90% arise from environmental factors. These statistics have triggered widespread governmental action along two lines: (l) An effort to identify those chemicals and conditions that give rise to malignant processes has been mounted by the Carcino genesis Testing Program, the National Cancer Program, and subse quently, the National Toxicology Program. (2) Regulatory laws have been enacted that are administered by agencies such as TSCA, FIFRA, EPA, FDA, OSHA, and so on, whose mission is to minimize public ex posure to carcinogens. Since direct verification that specific chemicals induce cancer in hu of unanticipated expo mans is necessarily limited to known incidences sure and is therefore rare, most chemicals are identified as carcinogens only by laboratory experiments. At present, the only accepted procedure is long-term animal bioassay, and not only are these studies expensive and time-consuming, but current worldwide resources permit the evalua tion of only 300-400 chemicals per year, a miniscule amount compared to what is available in the commercial world: 30,000 existing chemicals, with approximately 700 new such materials being introduced every year.
Author : Alexander Hollaender,Frederick J. de Serres
Publisher : Springer Science & Business Media
Page : 316 pages
File Size : 43,9 Mb
Release : 2012-12-06
Category : Medical
ISBN : 9781461321477
Volume 9 of Chemical Mutagens consists mainly of chapters discussing the development and validation of short-term assays to detect the mutagenic effects of environmental chemicals. These chapters include an assay with the grasshopper neuroblast, a comparison of mutagenic responses of human lung-derived and skin-derived diploid fibroblasts, a forward-mutation assay in Salmonella, a multigene sporulation test in Bacillus subtilis, a specific locus assay in mouse lymphoma cells, a study of the induction of bacteriophage lambda, and the granuloma pouch assay. In addition, there are two chapters on the identification of mutagens in cooked food and in human feces. Frederick 1. de Serres Research Triangle Park, North Carolina vii Contents Chapter 1 The Grasshopper Neuroblast Short-Term Assay for Evaluating the Effects of Environmental Chemicals on Chromosomes and Cell Kinetics 1 Mary Esther Gaulden, Jan C. Liang, and Martha J. Ferguson 1. Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2. Embryo Supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2. 1. Species. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2. 2. Origin of Colonies . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2. 3. Life Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2. 4. Colony Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . 6 2. 5. Pathology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 2. 6. Allergy to Grasshoppers . . . . . . . . . . . . . . . . . . . . . . 14 3. Grasshopper Egg, Embryo, and Cells . . . . . . . . . . . . . . . . . 14 3. 1. The Egg Shell and Membranes . . . . . . . . . . . . . . . . . 14 3. 2. Embryonic Development . . . . . . . . . . . . . . . . . . . . . . 17 3. 3. Cells . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 4. Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 4. 1. Exposure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 4. 2. Preparation of Embryos for Cell Analysis . . . . . . . . . 34 4. 3. Analysis of Mutagen Effects. . . . . . . . . . . . . . . . . 40 . . . 5. Response of the Grasshopper Neuroblast to Mutagens . . . . 50 5. 1. Reproducibility of Data . . . . . . . . . . . . . . . . . . . . . . . 50 5. 2. Radiation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 5. 3. Chemical Mutagens . . . . . . . . . . . . . . . . . . . . . . . . . .
Author : Peter B. Farmer,John M. Walker
Publisher : Springer Science & Business Media
Page : 338 pages
File Size : 53,5 Mb
Release : 2012-12-06
Category : Science
ISBN : 9781468473131
This book aims to describe the current state of knowledge and possible future developments in a number of major areas of research into the nature, causes and treatment of cancer. The contributing authors have been encouraged to discuss their subjects at the molecular level. It will become apparent to the reader that considerable developments in the understanding of the fundamental nature of cancer, in molecular terms, are constantly being made. This is particularly the case in the area of oncogene research where differences between tumour and normal cells can now be defined in terms of altered expression of DNA sequences. An understanding of the methods available for detecting cancer, of the process of carcinogenesis and of the means available for treating cancer can only be achieved with a precise knowledge of the basic biochemical and molecular processes involved. Since it is all to easy for the research scientist to become totally absorbed within the specialised area of research in which he is involved, the first chapter is an attempt to encourage a broader field of vision by introducing the clinician's view of the cancer problem, which illustrates the broad spectrum of basic problems that need to be solved by the cancer researcher.
Author : William M. Wardell
Publisher : Springer Science & Business Media
Page : 339 pages
File Size : 40,6 Mb
Release : 2012-12-06
Category : Medical
ISBN : 9781468440553
This volume is the outcome of the International School of Phar macology course sponsored as a NATO Advanced Study Institute and held in Erice (Sicily) at the Ettore Majorana Centre for Scientific Culture from October 3 through 12, 1980. The course, which consisted of lectures and teaching seminars, examined issues of international importance in all phases of drug development, assessment, and regu lation. In order to recreate both the atmosphere and substance of the meeting, a variety of materials are included here: the papers pre sented by the lecturers, a selection of key items from the supple mentary materials provided by the lecturers to the participants, notes on issues raised during the discussions, and accounts of certain special sessions arranged in response to interests expressed by those attending. The course covered two broad areas represented here by parts of the book. Part I, "Drug Assessment and Regulation," is based on the nine sessions of the course that ranged in focus from recent developments in the science of clinical pharmacology and drug development to discussions of whether and how the regulation of drug development can (or should) be harmonized internationally. In Part 11, "Postmarketing Surveillance," many aspects of this important subject are presented. Arguments outlining the potential benefits of national and international postmarketing surveillance systems are qualified by consideration of the problems inherent in devising and using these systems.
Author : National Research Council,Division on Earth and Life Studies,Commission on Life Sciences,Committee on Comparative Toxicity of Naturally Occurring Carcinogens
Publisher : National Academies Press
Page : 433 pages
File Size : 51,7 Mb
Release : 1996-02-12
Category : Nature
ISBN : 9780309175715
Despite increasing knowledge of human nutrition, the dietary contribution to cancer remains a troubling question. Carcinogens and Anticarcinogens assembles the best available information on the magnitude of potential cancer riskâ€"and potential anticarcinogenic effectâ€"from naturally occurring chemicals compared with risk from synthetic chemical constituents. The committee draws important conclusions about diet and cancer, including the carcinogenic role of excess calories and fat, the anticarcinogenic benefit of fiber and other substances, and the impact of food additive regulation. The book offers recommendations for epidemiological and diet research. Carcinogens and Anticarcinogens provides a readable overview of issues and addresses critical questions: Does diet contribute to an appreciable proportion of human cancer? Are there significant interactions between carcinogens and anticarcinogens in the diet? The volume discusses the mechanisms of carcinogenic and anticarcinogenic properties and considers whether techniques used to evaluate the carcinogenic potential of synthetics can be used with naturally occurring chemicals. The committee provides criteria for prioritizing the vast number of substances that need to be tested. Carcinogens and Anticarcinogens clarifies the issues and sets the direction for further investigations into diet and cancer. This volume will be of interest to anyone involved in food and health issues: policymakers, regulators, researchers, nutrition professionals, and health advocates.
Author : Anonim
Publisher : Unknown
Page : 1576 pages
File Size : 46,6 Mb
Release : 1980-12-09
Category : Administrative law
ISBN : UIUC:30112059134632
Author : United States. Congress. House. Committee on Government Operations. Intergovernmental Relations and Human Resources Subcommittee
Publisher : Unknown
Page : 524 pages
File Size : 50,5 Mb
Release : 1984
Category : Contraceptives
ISBN : UCR:31210012875710
Author : H.F. Stich,R.H.C. San
Publisher : Springer Science & Business Media
Page : 535 pages
File Size : 51,7 Mb
Release : 2012-12-06
Category : Medical
ISBN : 9781461258476
The recent surge of interest in designing, validating, and implementing short-term tests for carcinogens has been spurred by the fairly convincing correlation be tween the carcinogenicity and mutagenicity of chemicals and physical agents and by the assumption that DNA alteration, mutations, and chromosome aberrations are somehow involved in neoplastic transformation. Moreover, it has been tacitly assumed that the mutagenic capacity alone of compounds would induce regulatory agencies to pass rules for their removal from the environment and would lead the public to avoid them. The actual response, however, is quite different. Governmental departments shy away from making any decisions on the basis of in vitro test systems. The public at large is becoming irritated by daily an nouncements that many of their cherished habits could adversely affect their health. Industry appears to feel threatened and may reduce its search for new beneficial chemicals. The reluctance to accept wholeheartedly the mutagenicity tests for the detection of carcinogens is partly due to uncertainty about the in volvement of mutations in neoplastic transformation, partly due to the present difficulty of extrapolating results from various endpoints obtained on numerous organisms to man, and partly due to a multitude of complex events that lead in vivo to the evolvement of benign or malignant tumors.