Helmut Greim – författare
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22 produkter
22 produkter
Inbunden, Engelska, 1996
2 239 kr
Skickas inom 10-15 vardagar
Much of organic chemistry is based on the ability of suitably structured chemicals to bind together through the formation of covalent bonds. Biochemistry is replete with exam ples of enzymatically catalyzed reactions in which normal body constituents can be linked through covalent bonds during the process of intermediary metabolism. The finding that xenobiotic chemicals that enter the body from the environment, are metabolized to highly reactive species, and then covalently react with cellular macromolecules to induce toxic and carcinogenic effects was an observation that spawned the research featured in the Fifth International Symposium on Biological Reactive Intermediates (BRI V). The group of investigators that became fascinated with this process and its signifi cance in terms of human health began their discussions in Turku, Finland (J 975), and continued them at Guildford, England (1980), College Park, Maryland (1985), Tucson, Arizona (1990), and Munich, Germany (1995). Among the results were a series of reports listed below, as well as the book for which this serves as the Preface. • Jollow, DJ., Kocsis, J.J., Snyder, R. and Vainio, H. (eds), Biological Reactive Intermediates: Formation, Toxicity and Inactivation, Plenum Press, NY, 1975. • Snyder, R., Park, D.V., Kocsis, J.J., Jollow, D.V., Gibson, G.G. and Witmer, C.M. (eds), Biological Reactive Intermediates II: Chemical Mechanisms and Biological Effects, Plenum Press, N.Y., 1982.
Inbunden, Engelska, 2001
2 239 kr
Skickas inom 10-15 vardagar
Historically we have separated the disciplines of Chemistry and Biochemistry by recognizing that the distinguishing characteristic of Biochemistry is the catalysis of reactions by enzymes. Enzymes permit metabolic reactions which would otherwise require extremes of temperature, pressure or pH, often associated with Chemistry, to proceed under ambient conditions of the body. Under some conditions chemical reactions occur in vivo in which products of enzymatic reactions proceed to undergo further reactions non- enzymatically with cellular macromolecules. The results can often be seen as toxic or carcinogenic responses. The chemicals that initiate these reactions are termed "biological reactive intermediates. " The International Symposia on Biological Reactive Intermediates (BRI) began in 1975 at the University of Turku, Finland and have since convened at the University of Surrey, Guildford, The United Kingdom (1980), the University of Maryland, College Park, Maryland (1985), the University of Arizona, Tucson, Arizona (1990), the GSF Forschungszentrum and Technical University of Munich (1995) and, most recently, at the Universite Rene Descartes, Paris, France (2000).The Symposium was organized by an International Planning Committee co-chaired by P. Dansette (Paris, France) and TJ. Monks (Austin, Texas). The committee included: P. H. Beaune (Paris, France), M. De\aforge (Saclay, France), G. P. Gervasi (Pisa, Italy), G. G. Gibson (Guildford, UK), H. Greim (Munich, Germany), DJ. Jollow (Charleston, South Carolina), P. Moldeus (Sodertalje, Sweden), I. G. Sipes (Tucson, Arizona), R. Snyder PJ. van Bladderen (Zeist, The Netherlands). They were (Piscataway, New Jersey), and assisted by an International Scientific Program Advisory Committee which included: TJ.
E-bok
PDF, Engelska, 20081 860 kr
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This new book, written by two outstanding scientists in the field, describes the basic principles of toxic mechanisms and organ toxicity, providing detailed information on specific mechanisms or chemicals for exemplification. The goal is to provide sufficient information that the reader becomes familiar with the basic concepts in toxicology to enable him or her to understand the basic principles in toxicology and to evaluate the risks at given exposures. With this basic understanding the reader also will be able to critically evaluate the available information on a chemical and to identify data gaps.
In addition to the introductory chapters the book will offer the following systematic information, presented in six special sections:
Principles in Toxicology Organ Toxicology Methods in Toxicology Risk Assessment Risk Management Toxicity of ChemicalsFulfilling a demand for such a book, this will be a welcomed introductory text for students and non-experts alike to focus on and understand the principles of hazard identification and risk assessment of toxicants. Relevant to all those studying toxicology, biochemistry, biology, medicine and chemistry, as well as toxicologists in hospitals, universities and in industry.
E-bok
PDF, Engelska, 20182 061 kr
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Provides a complete understanding of how our bodies respond to toxicants, and the principles used to assess the health risks of specific exposure scenarios
Toxicology and Risk Assessment: A Comprehensive Introduction, Second Edition reflects recent advances in science and technology, and provides the scientific background and methodological issues to enable the reader to understand the basic principles in toxicology and to evaluate the health risks of specific exposure scenarios.
Completely updated with the latest information, this book offers a concise introduction to the subject. It is divided into five sections: Principles in Toxicology, Organ Toxicology, Methods in Toxicology, Regulatory Toxicology, and Specific Toxicity. The 2nd Edition adds new chapters that cover recent scientific and technological advances and current topics including the endocrine system, alternatives to animal testing, risk assessment and thresholds for carcinogens, European and international regulation, nanomaterials, fuels, fragrances, and agrochemicals.
Concentrates on the basic concepts of toxicology and provides sufficient information for the reader to become familiar with them in order to understand the principles and to evaluate the risks at given exposures 30% new chapters cover recent scientific and technological advances including alternatives to animal testing; genotoxic carcinogens; REACH regulations; nanomaterials; fuels; fragrances; PAHs; and agrochemicals Written by a team of international specialists, and edited by two outstanding scientists in the fieldFully updated and expanded, Toxicology and Risk Assessment: A Comprehensive Introduction, Second Edition is an essential text for any student or researcher with an interest in toxicology and related risk assessments.
E-bok
Engelska, 20182 061 kr
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Provides a complete understanding of how our bodies respond to toxicants, and the principles used to assess the health risks of specific exposure scenarios
Toxicology and Risk Assessment: A Comprehensive Introduction, Second Edition reflects recent advances in science and technology, and provides the scientific background and methodological issues to enable the reader to understand the basic principles in toxicology and to evaluate the health risks of specific exposure scenarios.
Completely updated with the latest information, this book offers a concise introduction to the subject. It is divided into five sections: Principles in Toxicology, Organ Toxicology, Methods in Toxicology, Regulatory Toxicology, and Specific Toxicity. The 2nd Edition adds new chapters that cover recent scientific and technological advances and current topics including the endocrine system, alternatives to animal testing, risk assessment and thresholds for carcinogens, European and international regulation, nanomaterials, fuels, fragrances, and agrochemicals.
Concentrates on the basic concepts of toxicology and provides sufficient information for the reader to become familiar with them in order to understand the principles and to evaluate the risks at given exposures 30% new chapters cover recent scientific and technological advances including alternatives to animal testing; genotoxic carcinogens; REACH regulations; nanomaterials; fuels; fragrances; PAHs; and agrochemicals Written by a team of international specialists, and edited by two outstanding scientists in the fieldFully updated and expanded, Toxicology and Risk Assessment: A Comprehensive Introduction, Second Edition is an essential text for any student or researcher with an interest in toxicology and related risk assessments.
Inbunden, Engelska, 2024
34 749 kr
Skickas inom 5-8 vardagar
The leading source for industrial and occupational toxicology for over 75 years. Patty's Toxicology was originally published as Patty's Industrial Hygiene and Toxicology in 1948 and has long been recognized as the premier reference for toxicological information on a large number of industrial chemicals. It includes comprehensive toxicological data for industrial compounds, including CAS numbers, physical and chemical properties, exposure limits, and biological tolerance values for occupational exposures. The new edition provides updates for 90 chapters and features 20 new chapters. New Editors-in-Chief, and for the first time a group of Associate editors, bring a diverse new perspective and a more international focus. Expanded with close to 1,000 more pages than the previous editionNew chapters added to the introductory volume of the book include Biotransformation of Xenobiotics, Toxicokinetics, Genetic Toxicology, Cancer Risk Assessment, Reproductive and Developmental Toxicology, and the setting of Occupational Exposure LimitsSeveral sections are reorganized and expanded including Agricultural Chemicals and Nanomaterials which covers Insecticides, Herbicides, Agricultural Triazole Fungicide, Rodenticides, Insect Repellents (DEET) and Others, and Combined Pesticide ExposureOther new chapters include Diesel Exhaust, Occupational Biomonitoring, Toxicokinetics, Computational Toxicology, Genetic Toxicology, Immunotoxicology, Genetic Susceptibility in Occupational Health, Formaldehyde, Acrylates, and SiliconesAn essential reference for industrial hygienists, toxicologists, occupational physicians, chemical hygiene officers, chemical plant managers, and reference libraries.
Häftad, Engelska, 2012
2 239 kr
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Historically we have separated the disciplines of Chemistry and Biochemistry by recognizing that the distinguishing characteristic of Biochemistry is the catalysis of reactions by enzymes. Enzymes permit metabolic reactions which would otherwise require extremes of temperature, pressure or pH, often associated with Chemistry, to proceed under ambient conditions of the body. Under some conditions chemical reactions occur in vivo in which products of enzymatic reactions proceed to undergo further reactions non- enzymatically with cellular macromolecules. The results can often be seen as toxic or carcinogenic responses. The chemicals that initiate these reactions are termed "biological reactive intermediates. " The International Symposia on Biological Reactive Intermediates (BRI) began in 1975 at the University of Turku, Finland and have since convened at the University of Surrey, Guildford, The United Kingdom (1980), the University of Maryland, College Park, Maryland (1985), the University of Arizona, Tucson, Arizona (1990), the GSF Forschungszentrum and Technical University of Munich (1995) and, most recently, at the Universite Rene Descartes, Paris, France (2000).The Symposium was organized by an International Planning Committee co-chaired by P. Dansette (Paris, France) and TJ. Monks (Austin, Texas). The committee included: P. H. Beaune (Paris, France), M. De\aforge (Saclay, France), G. P. Gervasi (Pisa, Italy), G. G. Gibson (Guildford, UK), H. Greim (Munich, Germany), DJ. Jollow (Charleston, South Carolina), P. Moldeus (Sodertalje, Sweden), I. G. Sipes (Tucson, Arizona), R. Snyder PJ. van Bladderen (Zeist, The Netherlands). They were (Piscataway, New Jersey), and assisted by an International Scientific Program Advisory Committee which included: TJ.
E-bok
PDF, Engelska, 20122 822 kr
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E-bok
PDF, Engelska, 20132 822 kr
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Much of organic chemistry is based on the ability of suitably structured chemicals to bind together through the formation of covalent bonds. Biochemistry is replete with exam ples of enzymatically catalyzed reactions in which normal body constituents can be linked through covalent bonds during the process of intermediary metabolism. The finding that xenobiotic chemicals that enter the body from the environment, are metabolized to highly reactive species, and then covalently react with cellular macromolecules to induce toxic and carcinogenic effects was an observation that spawned the research featured in the Fifth International Symposium on Biological Reactive Intermediates (BRI V). The group of investigators that became fascinated with this process and its signifi cance in terms of human health began their discussions in Turku, Finland (J 975), and continued them at Guildford, England (1980), College Park, Maryland (1985), Tucson, Arizona (1990), and Munich, Germany (1995). Among the results were a series of reports listed below, as well as the book for which this serves as the Preface. • Jollow, DJ., Kocsis, J.J., Snyder, R. and Vainio, H. (eds), Biological Reactive Intermediates: Formation, Toxicity and Inactivation, Plenum Press, NY, 1975. • Snyder, R., Park, D.V., Kocsis, J.J., Jollow, D.V., Gibson, G.G. and Witmer, C.M. (eds), Biological Reactive Intermediates II: Chemical Mechanisms and Biological Effects, Plenum Press, N.Y., 1982.
Häftad, Engelska, 2013
2 241 kr
Skickas inom 10-15 vardagar
Much of organic chemistry is based on the ability of suitably structured chemicals to bind together through the formation of covalent bonds. Biochemistry is replete with exam ples of enzymatically catalyzed reactions in which normal body constituents can be linked through covalent bonds during the process of intermediary metabolism. The finding that xenobiotic chemicals that enter the body from the environment, are metabolized to highly reactive species, and then covalently react with cellular macromolecules to induce toxic and carcinogenic effects was an observation that spawned the research featured in the Fifth International Symposium on Biological Reactive Intermediates (BRI V). The group of investigators that became fascinated with this process and its signifi cance in terms of human health began their discussions in Turku, Finland (J 975), and continued them at Guildford, England (1980), College Park, Maryland (1985), Tucson, Arizona (1990), and Munich, Germany (1995). Among the results were a series of reports listed below, as well as the book for which this serves as the Preface. • Jollow, DJ., Kocsis, J.J., Snyder, R. and Vainio, H. (eds), Biological Reactive Intermediates: Formation, Toxicity and Inactivation, Plenum Press, NY, 1975. • Snyder, R., Park, D.V., Kocsis, J.J., Jollow, D.V., Gibson, G.G. and Witmer, C.M. (eds), Biological Reactive Intermediates II: Chemical Mechanisms and Biological Effects, Plenum Press, N.Y., 1982.
E-bok
PDF, Engelska, 20122 107 kr
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Genotoxic carcinogens can lead to DNA mutations with the potential to cause cancer. Typically, a series of mutation events are needed before malignancy occurs so a single, small exposure may not result in disease. Also, cells have an armoury of defence mechanisms which, to a degree, counter the effects of mutagens. Distinguishing the point at which exposure to a carcinogen increases mutation rates beyond the background level is challenging. In fact, there is now general agreement that, for genotoxic carcinogens, no specific threshold can be identified. However, NOAELs (No Observed Adverse Effect Levels) may be used in the process of establishing a dose-response relationship. These denote the level of exposure at which there is no significant increase in adverse effects in the exposed population when compared to an appropriate control. Such a scientifically defendable threshold allows us to propose health based exposure limits for genotoxic carcinogens. This book describes the various cellular defence mechanisms individually and explains how they are regulated. The processes covered include metabolic inactivation, epigenetic regulation, scavenging mechanisms, DNA-repair and apoptosis. It also considers dose-dependent threshold mechanisms of carcinogenesis and the rate limiting parameters. Aimed at graduate level and above, the book discusses the consequences of genotoxic evaluation and urges readers to question the idea that even low exposures present a cancer risk.
Inbunden, Tyska, 2017
1 902 kr
Skickas inom 5-8 vardagar
Ein internationales Expertenteam unter Leitung eines der renommiertesten deutschen Toxikologen beschreibt die Toxikologie in ihrer gesamten Breite, von grundlegenden Aspekten der molekularen Wirkung von Toxinen über die Wechselwirkung des menschlichen Organismus mit Fremdstoffen bis hin zu Fragen des Schutzes vor und der Risikobewertung von Schadstoffen.Der toxikologische Dreiklang von Stoff, Organismus und Untersuchungsmethode wird in drei großen Teilen mit zahlreichen Querverweisen umfassend und systematisch dargestellt. Der Abchnitt "Regulatorische Toxikologie" erläutert die nationalen und internationalen Rechtsgrundlagen für die Untersuchung, Bewertung und Kontrolle toxischer Stoffe. Aktuelle methodische Entwicklungen, etwa im Bereich der Hochdurchsatzverfahren und der Alternativmethoden zum klassichen Tierversuch werden ebenso beschrieben wie neuere Forschungsergebnisse zur Toxizität von Nanomaterialien, Duftstoffen und Abbauprodukten von Medikamenten in der Umwelt.Dieses Handbuch ist ein zuverlässiger Begleiter für alle toxikologischen Fragestellungen in Ausbildung, Lehre und beruflicher Praxis.
Häftad, Tyska, 2022
371 kr
Skickas inom 3-6 vardagar
Was man über Giftstoffe, deren Wirkung und Bewertung wissen muss: Zwei erfahrene Toxikologen erklären allgemeinverständlich, wann ein Stoff zum Schadstoff wird.Der Schwerpunkt liegt dabei auf den allgemeinen Grundlagen einer toxikologischen Untersuchung und Bewertung von Schadstoffen, sowie den daraus abgeleiteten Handlungsempfehlungen. Anhand bekannter Beispiele aus den letzten Jahren, u. a. des Unkrautvernichters Glyphosat oder des Insektizids Fipronil, die beide in Nahrungsmitteln nachgewiesen wurden, wird erläutert, wie konkrete Gesundheitsgefährdungen anhand toxikologischer Daten und Verfahren ermittelt und welche Maßnahmen zum Schutz der Gesundheit daraus abgeleitet werden. Die Anwendung der toxikologischen Verfahren für die Bewertung von Gesundheitsrisiken wird anhand von Beispielen aus dem Alltag anschaulich dargestellt, von Lebensmitteln über Kosmetika bis hin zu Arzneimitteln und Alltagsprodukten.Ein kompakter, aber fundierter Einstieg in ein wichtiges und oft kontrovers diskutiertes Thema - für alle, die Toxine und deren Wirkungen auf Mensch und Umwelt verstehen wollen.
E-bok
PDF, Tyska, 20172 229 kr
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Ein internationales Expertenteam unter Leitung eines der renommiertesten deutschen Toxikologen beschreibt die Toxikologie in ihrer gesamten Breite, von grundlegenden Aspekten der molekularen Wirkung von Toxinen über die Wechselwirkung des menschlichen Organismus mit Fremdstoffen bis hin zu Fragen des Schutzes vor und der Risikobewertung von Schadstoffen. Der toxikologische Dreiklang von Stoff, Organismus und Untersuchungsmethode wird in drei großen Teilen mit zahlreichen Querverweisen umfassend und systematisch dargestellt. Der Abchnitt "Regulatorische Toxikologie" erläutert die nationalen und internationalen Rechtsgrundlagen für die Untersuchung, Bewertung und Kontrolle toxischer Stoffe. Aktuelle methodische Entwicklungen, etwa im Bereich der Hochdurchsatzverfahren und der Alternativmethoden zum klassichen Tierversuch werden ebenso beschrieben wie neuere Forschungsergebnisse zur Toxizität von Nanomaterialien, Duftstoffen und Abbauprodukten von Medikamenten in der Umwelt. Dieses Handbuch ist ein zuverlässiger Begleiter für alle toxikologischen Fragestellungen in Ausbildung, Lehre und beruflicher Praxis.
E-bok
Tyska, 20172 061 kr
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Ein internationales Expertenteam unter Leitung eines der renommiertesten deutschen Toxikologen beschreibt die Toxikologie in ihrer gesamten Breite, von grundlegenden Aspekten der molekularen Wirkung von Toxinen über die Wechselwirkung des menschlichen Organismus mit Fremdstoffen bis hin zu Fragen des Schutzes vor und der Risikobewertung von Schadstoffen. Der toxikologische Dreiklang von Stoff, Organismus und Untersuchungsmethode wird in drei großen Teilen mit zahlreichen Querverweisen umfassend und systematisch dargestellt. Der Abchnitt "Regulatorische Toxikologie" erläutert die nationalen und internationalen Rechtsgrundlagen für die Untersuchung, Bewertung und Kontrolle toxischer Stoffe. Aktuelle methodische Entwicklungen, etwa im Bereich der Hochdurchsatzverfahren und der Alternativmethoden zum klassichen Tierversuch werden ebenso beschrieben wie neuere Forschungsergebnisse zur Toxizität von Nanomaterialien, Duftstoffen und Abbauprodukten von Medikamenten in der Umwelt. Dieses Handbuch ist ein zuverlässiger Begleiter für alle toxikologischen Fragestellungen in Ausbildung, Lehre und beruflicher Praxis.
E-bok
Tyska, 2022358 kr
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Was man über Giftstoffe, deren Wirkung und Bewertung wissen muss: Zwei erfahrene Toxikologen erklären allgemeinverständlich, wann ein Stoff zum Schadstoff wird. Der Schwerpunkt liegt dabei auf den allgemeinen Grundlagen einer toxikologischen Untersuchung und Bewertung von Schadstoffen, sowie den daraus abgeleiteten Handlungsempfehlungen. Anhand bekannter Beispiele aus den letzten Jahren, u. a. des Unkrautvernichters Glyphosat oder des Insektizids Fipronil, die beide in Nahrungsmitteln nachgewiesen wurden, wird erläutert, wie konkrete Gesundheitsgefährdungen anhand toxikologischer Daten und Verfahren ermittelt und welche Maßnahmen zum Schutz der Gesundheit daraus abgeleitet werden. Die Anwendung der toxikologischen Verfahren für die Bewertung von Gesundheitsrisiken wird anhand von Beispielen aus dem Alltag anschaulich dargestellt, von Lebensmitteln über Kosmetika bis hin zu Arzneimitteln und Alltagsprodukten. Ein kompakter, aber fundierter Einstieg in ein wichtiges und oft kontrovers diskutiertes Thema - für alle, die Toxine und deren Wirkungen auf Mensch und Umwelt verstehen wollen.
E-bok
PDF, Tyska, 2022373 kr
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Was man über Giftstoffe, deren Wirkung und Bewertung wissen muss: Zwei erfahrene Toxikologen erklären allgemeinverständlich, wann ein Stoff zum Schadstoff wird. Der Schwerpunkt liegt dabei auf den allgemeinen Grundlagen einer toxikologischen Untersuchung und Bewertung von Schadstoffen, sowie den daraus abgeleiteten Handlungsempfehlungen. Anhand bekannter Beispiele aus den letzten Jahren, u. a. des Unkrautvernichters Glyphosat oder des Insektizids Fipronil, die beide in Nahrungsmitteln nachgewiesen wurden, wird erläutert, wie konkrete Gesundheitsgefährdungen anhand toxikologischer Daten und Verfahren ermittelt und welche Maßnahmen zum Schutz der Gesundheit daraus abgeleitet werden. Die Anwendung der toxikologischen Verfahren für die Bewertung von Gesundheitsrisiken wird anhand von Beispielen aus dem Alltag anschaulich dargestellt, von Lebensmitteln über Kosmetika bis hin zu Arzneimitteln und Alltagsprodukten. Ein kompakter, aber fundierter Einstieg in ein wichtiges und oft kontrovers diskutiertes Thema - für alle, die Toxine und deren Wirkungen auf Mensch und Umwelt verstehen wollen.
Häftad, Engelska, 1989
563 kr
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This supplement contains the papers submitted at EUROTOX 88, the joint Congress of the European Society of Toxicology and the Federation of the European Societies of Toxicology. The theme was one of monitoring and examining the effects of toxic substances in the biological response at the subcellular level. Mechanisms of metal carcinogenicity are discussed as well as the biomonitoring of chemical exposure. Reports are provided on the role of individual differences in man and the effect of risk assessment. Papers appear dealing with the genetic control of drug metabolizing enzymes. The role of metabolism in organic specific toxicity is discussed. Information is included on the toxicological impact of chemicals interfering with the endocrine system as well as on the effects of toxicants on the immune system. Presentations deal with the current status of risk assessment in environmental toxicology.
E-bok
PDF, Engelska, 2012708 kr
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This supplement contains the papers submitted at EUROTOX 88, the joint Congress of the European Society of Toxicology and the Federation of the European Societies of Toxicology. The theme was one of monitoring and examining the effects of toxic substances in the biological response at the subcellular level. Mechanisms of metal carcinogenicity are discussed as well as the biomonitoring of chemical exposure. Reports are provided on the role of individual differences in man and the effect of risk assessment. Papers appear dealing with the genetic control of drug metabolizing enzymes. The role of metabolism in organic specific toxicity is discussed. Information is included on the toxicological impact of chemicals interfering with the endocrine system as well as on the effects of toxicants on the immune system. Presentations deal with the current status of risk assessment in environmental toxicology.
Inbunden, Engelska, 2018
1 452 kr
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Provides a complete understanding of how our bodies respond to toxicants, and the principles used to assess the health risks of specific exposure scenariosToxicology and Risk Assessment: A Comprehensive Introduction, Second Edition reflects recent advances in science and technology, and provides the scientific background and methodological issues to enable the reader to understand the basic principles in toxicology and to evaluate the health risks of specific exposure scenarios.Completely updated with the latest information, this book offers a concise introduction to the subject. It is divided into five sections: Principles in Toxicology, Organ Toxicology, Methods in Toxicology, Regulatory Toxicology, and Specific Toxicity. The 2nd Edition adds new chapters that cover recent scientific and technological advances and current topics including the endocrine system, alternatives to animal testing, risk assessment and thresholds for carcinogens, European and international regulation, nanomaterials, fuels, fragrances, and agrochemicals. Concentrates on the basic concepts of toxicology and provides sufficient information for the reader to become familiar with them in order to understand the principles and to evaluate the risks at given exposures30% new chapters cover recent scientific and technological advances including alternatives to animal testing; genotoxic carcinogens; REACH regulations; nanomaterials; fuels; fragrances; PAHs; and agrochemicalsWritten by a team of international specialists, and edited by two outstanding scientists in the fieldFully updated and expanded, Toxicology and Risk Assessment: A Comprehensive Introduction, Second Edition is an essential text for any student or researcher with an interest in toxicology and related risk assessments.
Inbunden, Engelska, 2012
2 408 kr
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Genotoxic carcinogens can lead to DNA mutations with the potential to cause cancer. Typically, a series of mutation events are needed before malignancy occurs so a single, small exposure may not result in disease. Also, cells have an armoury of defence mechanisms which, to a degree, counter the effects of mutagens. Distinguishing the point at which exposure to a carcinogen increases mutation rates beyond the background level is challenging. In fact, there is now general agreement that, for genotoxic carcinogens, no specific threshold can be identified. However, NOAELs (No Observed Adverse Effect Levels) may be used in the process of establishing a dose-response relationship. These denote the level of exposure at which there is no significant increase in adverse effects in the exposed population when compared to an appropriate control. Such a scientifically defendable threshold allows us to propose health based exposure limits for genotoxic carcinogens. This book describes the various cellular defence mechanisms individually and explains how they are regulated. The processes covered include metabolic inactivation, epigenetic regulation, scavenging mechanisms, DNA-repair and apoptosis. It also considers dose-dependent threshold mechanisms of carcinogenesis and the rate limiting parameters. Aimed at graduate level and above, the book discusses the consequences of genotoxic evaluation and urges readers to question the idea that even low exposures present a cancer risk.
13 428 kr
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