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Author: Frédéric Gimbert
Publisher:
ISBN:
Category :
Languages : fr
Pages : 172
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Book Description
Pour répondre aux interrogations sur le devenir et les conséquences environnementales des éléments traces métalliques (ETM), cette thèse vise à améliorer l’évaluation de la biodisponibilité, des transferts et des effets des ETM du sol en étudiant les cinétiques d’accumulation du cadmium (Cd), du plomb (Pb) et du zinc (Zn) chez l’escargot Helix aspera. Le suivi à long terme des concentrations internes offre une image des patterns d’accumulation et d’élimination de ces ETM. Le développement de modèles de toxicocinétiques permet d’obtenir pour la première fois au laboratoire et in situ une estimation des flux internes en ETM chez H. aspera. Les cinétiques contrastées entre Cd, Pb et Zn soulignent l’importance des caractéristiques intrinsèques des ETM et de l’organisme considéré. L’étude du fractionnement subcellulaire de ces ETM permet de comprendre la variabilité des patterns d’accumulation, de stratégies de dépuration et des effets toxiques induits sur la croissance et la reproduction de H. aspera. La séquestration interne des ETM et leur potentiel d’excrétion déterminent l’acquisition d’un état d’équilibre dont le niveau est modulé par l’assimilation, directement liée au comportement de l’ETM dans le sol. Cet état stationnaire, en reflétant l’équilibre entre l’absorption et l’excrétion, constitue un seuil entre biodisponibilités environnementale et toxicologique. Ainsi, le flux d’absorption peut être considéré comme un indicateur de la biodisponibilité des ETM et comme un élément prédictif d’effets sublétaux. Ces travaux devraient contribuer au développement d’une ligne directrice bioaccumulation qui fait encore défaut pour l’évaluation des risques en milieu terrestre.
Author: Frédéric Gimbert
Publisher:
ISBN:
Category :
Languages : fr
Pages : 172
Get Book Here
Book Description
Pour répondre aux interrogations sur le devenir et les conséquences environnementales des éléments traces métalliques (ETM), cette thèse vise à améliorer l’évaluation de la biodisponibilité, des transferts et des effets des ETM du sol en étudiant les cinétiques d’accumulation du cadmium (Cd), du plomb (Pb) et du zinc (Zn) chez l’escargot Helix aspera. Le suivi à long terme des concentrations internes offre une image des patterns d’accumulation et d’élimination de ces ETM. Le développement de modèles de toxicocinétiques permet d’obtenir pour la première fois au laboratoire et in situ une estimation des flux internes en ETM chez H. aspera. Les cinétiques contrastées entre Cd, Pb et Zn soulignent l’importance des caractéristiques intrinsèques des ETM et de l’organisme considéré. L’étude du fractionnement subcellulaire de ces ETM permet de comprendre la variabilité des patterns d’accumulation, de stratégies de dépuration et des effets toxiques induits sur la croissance et la reproduction de H. aspera. La séquestration interne des ETM et leur potentiel d’excrétion déterminent l’acquisition d’un état d’équilibre dont le niveau est modulé par l’assimilation, directement liée au comportement de l’ETM dans le sol. Cet état stationnaire, en reflétant l’équilibre entre l’absorption et l’excrétion, constitue un seuil entre biodisponibilités environnementale et toxicologique. Ainsi, le flux d’absorption peut être considéré comme un indicateur de la biodisponibilité des ETM et comme un élément prédictif d’effets sublétaux. Ces travaux devraient contribuer au développement d’une ligne directrice bioaccumulation qui fait encore défaut pour l’évaluation des risques en milieu terrestre.
Author: Claire Laurent
Publisher: L'Editeur : EDP Sciences
ISBN: 9782868837943
Category : Animals
Languages : fr
Pages : 216
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Book Description
Les diverses crises qui ont affecté la filière agroalimentaire, ont généré la revendication de la part des consommateurs, au droit à la sécurité des aliments. Pour répondre à ces exigences, la nécessité de disposer d'avis rapides, fiables et clairs sur les questions émergeantes, a été relevée par la législation communautaire, législation qui imposera prochainement des évaluations des risques liés à l'alimentation pour toute la population européenne. C'est dans ce contexte que s'inscrit cet ouvrage visant à synthétiser les connaissances du transfert de polluants organiques (PCDD/F, PCB, HAP) et des éléments traces du sol vers l'animal d'élevage.
Author: Edward R. Landa
Publisher: Springer Science & Business Media
ISBN: 9048129605
Category : Technology & Engineering
Languages : en
Pages : 524
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Book Description
SOIL: beneath our feet / food and fiber / ashes to ashes, dust to dust / dirt!Soil has been called the final frontier of environmental research. The critical role of soil in biogeochemical processes is tied to its properties and place—porous, structured, and spatially variable, it serves as a conduit, buffer, and transformer of water, solutes and gases. Yet what is complex, life-giving, and sacred to some, is ordinary, even ugly, to others. This is the enigma that is soil. Soil and Culture explores the perception of soil in ancient, traditional, and modern societies. It looks at the visual arts (painting, textiles, sculpture, architecture, film, comics and stamps), prose & poetry, religion, philosophy, anthropology, archaeology, wine production, health & diet, and disease & warfare. Soil and Culture explores high culture and popular culture—from the paintings of Hieronymus Bosch to the films of Steve McQueen. It looks at ancient societies and contemporary artists. Contributors from a variety of disciplines delve into the mind of Carl Jung and the bellies of soil eaters, and explore Chinese paintings, African mud cloths, Mayan rituals, Japanese films, French comic strips, and Russian poetry.
Author: Lisa H. WEASEL Ph.D.
Publisher: AMACOM Div American Mgmt Assn
ISBN: 0814401783
Category : Technology & Engineering
Languages : en
Pages : 258
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Book Description
More than ten years ago, the first genetically modified foods took their place on the shelves of American supermarkets. But while American consumers remained blissfully unconcerned with the new products that suddenly filled their kitchens, Europeans were much more wary of these “Frankenfoods.” When famine struck Africa in 2002, several nations refused shipments of genetically modified foods, fueling a controversy that put the issue on the world's political agenda for good. In Food Fray, esteemed molecular biologist Dr. Lisa H. Weasel brings readers into the center of this debate, capturing the real-life experiences of the scientists, farmers, policymakers and grassroots activists on the front lines. Here she combines solid scientific knowledge and a gripping narrative to tell the real story behind the headlines and the hype. Seminal and cutting-edge, Food Fray enlightens and informs and will allow readers to make up their own minds about one of the most important issues facing us today.
Author: Jef Caers
Publisher: John Wiley & Sons
ISBN: 1119998719
Category : Science
Languages : en
Pages : 294
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Book Description
Modeling Uncertainty in the Earth Sciences highlights the various issues, techniques and practical modeling tools available for modeling the uncertainty of complex Earth systems and the impact that it has on practical situations. The aim of the book is to provide an introductory overview which covers a broad range of tried-and-tested tools. Descriptions of concepts, philosophies, challenges, methodologies and workflows give the reader an understanding of the best way to make decisions under uncertainty for Earth Science problems. The book covers key issues such as: Spatial and time aspect; large complexity and dimensionality; computation power; costs of 'engineering' the Earth; uncertainty in the modeling and decision process. Focusing on reliable and practical methods this book provides an invaluable primer for the complex area of decision making with uncertainty in the Earth Sciences.
Author: Gerald McNerney
Publisher: AMACOM Div American Mgmt Assn
ISBN: 0814413722
Category : Business & Economics
Languages : en
Pages : 321
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Book Description
Americans are already feeling the pressures of the current energy situation, and many of us are ready to make a change. Clean Energy Nation is a timely and hopeful look at an issue we can't afford to ignore. --Book Jacket.
Author: Pam Helling
Publisher: AMACOM Div American Mgmt Assn
ISBN: 0761214135
Category : Business writing
Languages : en
Pages : 132
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Book Description
Positive, practical techniques for achieving a more professional writing style. Here are the "how to" keys of writing-from putting the first words on paper to the final polishing and proofreading. Readers will learn how to edit their writing for improved clarity, cut excess words, use transitional phrases, recognize and correct run-on sentences and overcome procrastination and impulsive writing. Readers will learn how to: Identify the key components of any well-written business document Cut excess words and phrases from your writing Use transitional words and phrases Avoid misplaced and dangling modifiers and split infinitives Use commas, semicolons, colons, dashes, and parentheses Use slash marks, ellipsis marks, quotation marks, italics, and brackets Recognize and correct run-on sentences Proofread your writing for clarity of meaning Overcome the two common writing problems that waste time and money-procrastination and impulsive writing. This is an ebook version of the AMA Self-Study course. If you want to take the course for credit you need to either purchase a hard copy of the course through amaselfstudy.org or purchase an online version of the course through www.flexstudy.com.
Author: Lawrence WEBBER
Publisher: AMACOM Div American Mgmt Assn
ISBN: 0814414478
Category : Business & Economics
Languages : en
Pages : 306
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Book Description
With today’s electronic systems consuming massive amounts of energy, and improper disposal of old equipment threatening to release dangerous toxicity into the atmosphere, any company whose IT department isn’t actively working to shrink its carbon footprint isn’t just hurting the environment...it is also probably wasting money. Green Tech provides readers with practical, easily implemented strategies for sustainable computing, showing them how to: • build a business case to influence their organization's green strategy • reduce costs and improve equipment utilization while maintaining current customer service levels • identify old equipment at all levels, as well as suitable green replacements • virtualize servers • find alternative methods for data center cooling • conduct an energy audit and establish an energy baseline • determine the best options for recycling or donating old equipment Filled with realistic, cost-efficient ideas, this book shows that going green isn’t just the right thing to do, but also a good business strategy.
Author: Richard A. Swanson
Publisher: Berrett-Koehler Publishers
ISBN: 1609947339
Category : Business & Economics
Languages : en
Pages : 238
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Book Description
Theory matters in applied disciplines—fields that apply scholarly research to professional practice, such as management, social work, health care, human resource development, education, and many others. Because these disciplines deal with human beings in the real world, a flawed theory can result in actual harm to people and institutions. When faced with a professional problem, practitioners resort to the latest fad or simply throw everything and anything at it because of the lack of sound theory. Scholars deal with problems by slicing them into small segments to study them but fail to address the practical implications. What's needed is a way to unite research and practice to create robust theory. This is exactly what Richard Swanson and Thomas Chermack offer here: a complete, five-step method for developing sound, field-tested theory in applied disciplines. Unlike many existing methods, which cover only the initial conceptualization of a theory, the authors offer a complete approach, from conceptualizing a theory to creating relevant assessment criteria, establishing a research agenda to test the theory's validity, applying the theoretical concepts in the real world, and using that experience to further refine and improve the theory. The method is not restricted to any single discipline, nor is it beholden to any research ideology. Swanson and Chermack provide a set of tools for each phase of the process, making this book accessible and applicable to a wide audience. And in addition to examples in each chapter, they offer two extended case examples of complete theory building. With flawed theories impeding the development of many applied disciplines, this book is desperately needed.
Author: Nadya Zhexembayeva
Publisher: Berrett-Koehler Publishers
ISBN: 160994965X
Category : Business & Economics
Languages : en
Pages : 209
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Book Description
"Business is waking up to a global shortage of resources of every kind. Raw materials are running out, whether in Tokyo or Quito. While businesses have toyed with the idea of sustainability as a means to market to eco-minded consumers, this book shows that scarcity must become central to their thinking and the key driver of strategic innovation"--
