Assessing Chemical Mutagens


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ASSESSING CHEMICAL MUTAGENS, THE RISK TO HUMANS (VOLUME 1).


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1 MUTATION AND DISEASE IN HUMANS. 2 STRENGTHS AND WEAKNESSES OF TESTS FOR MUTAGENESIS. 3 BACTERIAL MUTAGENICITY TESTING: SOME PRACTICAL CONSIDERATIONS. 4 THEORY AND DESIGN OF SHORT TERM BACTERIAL TESTS FOR MUTAGENESIS. 5 DNA REPAIR. 6 CYTOGENETIC STUDIES AND RISK ASSESSMENT FOR CHEMICALS AND IONIZING RADIATION. 7 RADIATION INDUCED CANCER. 8 LOW DOSE AND SPECIES TO SPECIES EXTRAPOLATION FOR CHEMICALLY INDUCED CARCINOGENESIS. 9 ESTIMATING RADIATION INDUCED CARCINOGENESIS. 10 RISK ASSESSMENT OF ETHYLENE OXIDE AND OTHER COMPOUNDS. 11 DOSIMETRY OF ALKYLATING AGENTS. 12 ARE BENZENE EFFECTS LIMITED TO THE CHROMOSOMAL LEVEL?. 13 GENERAL ASPECTS OF COMPARATIVE MUTAGENESIS.




Mutagenicity: Assays and Applications


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Mutagenicity: Assays and Applications presents an extensive examination of the detection, assessment and future of mutagenicity, particularly as it concerns human health and the environment. Chapters focused on specific types of mutagens or testing methods for their detection collectively explore the current state of human and environmental mutagenesis, future perspectives and regulatory needs. The test procedures for measuring mutagenicity, their advantages and limitations are described with practical and procedural detail, along with their presentation and data processing aspects. It is an essential reference covering the breadth and depth of the field of mutagenicity studies and regulation. By providing both important introductory material and practical assays and applications, this book is useful to graduate students, academic and industry researchers and regulators at various stages of their careers, leading to improved risk assessment and regulation. - Presents an up-to-date and in-depth review of the current state of mutagenesis research - Draws upon the combined experience and expertise of an international group of highly respected editors and chapter authors - Provides an introduction to the concept of mutagenesis with particular consideration given to novel chemicals and materials




Chemical Mutagens


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As editor I want especially to thank Dr. Ernst Freese for helpful co operation in preparing these volumes, and to express my appreclatlOn to Drs. Kurt Hirschhorn and Marvin Legator, the other members of the editorial board. Alexander Hollaender January 1971 Preface The purpose of these volumes is to encourage the development and ap plication of testing and monitoring procedures to avert significant human exposure to mutagenic agents. The need for protection against exposure to possibly mutagenic chemicals is only now coming to be generally realized. The recently issued Report of the Secretary's Commission on Pesticides and Their Possible Effects on Health (the Mrak Report-U.S. Department of Health, Education and Welfare, December 1969) has made an important start. Its Panel on Mutagenicity recommends that all currently used pesticides be tested for mutagenicity in several recently developed and relatively simple systems. Whether recommendations such as these are actually put into effect will depend on convincing government, industry, and the public that the problem is important, that the proposed tests would be effective, and that they can be conducted at a cost that is not prohibitive. Why is it important to screen environmental agents for mutagenic activity? To those who will read this book, the answer is self-evident. The sine qua non of all that we value and all that we are is our genetic heritage.




Identifying and Estimating the Genetic Impact of Chemical Mutagens


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And conclusions; Introduction; A primer on genetics, mutation, mutagens, and the implications of mutagenesis; Metabolism and pharmacologic disposition of mutagens and promutagens; The nature of test systems; Strategies for risk assessment: the choice and use of test systems to estimative human germinal mututation; Strategies for risk assessment: relation between mutation rate and human welfare; Testing and monitoring human populations; A mutagen assessment program; Some additional issues and research suggestions.




Comparative Chemical Mutagenesis


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Frederick J. de Serres, Ph. D. Office of the Associate Director for Genetics National Institute of Environmental Health Sciences Research Triangle Park, North Carolina (U. S. A. ) 27709 The Workshop on Comparative Chemical Mutagenesis was orga nized to begin the process of problem identification and resolution concerning our needs to evaluate the data on test chemicals arising from assays for mutagenic activity on laboratory organisms. In the past, data on chemical mutagens has been generated and published in the scientific literature on a more or less random basis. Individual chemicals enjoy a brief period of "popularity" that leads to a burst of publications in the same or sometimes related assay systems. The incompleteness of the data base, in many of these cases, makes comparative mutagenesis difficult or impossible. In our attempts to compare the genetic effects of a given chemical over a wide range of assay systems, we are often interested in making quantitative as well as qualitative compari sons. To restate the first comparison: is the chemical under ques tion a weak, moderate or potent mutagen over a wide range of assay systems--or alternatively, does the level of response vary markedly? To make the second comparison, what is needed is information on the spectrum of genetic alterations produced as well as whether this spectrum is consistent over a wide range of organisms.




Diet Nutrition And Cancer


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This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.







Chemical Mutagens


Book Description

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 . . . . . . . . . . . . . . . . . . . . . . . . . .