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Articles 61 à 80 sur 700
Par Joseph Seckbach, Alexander Altenbach. 2011
ANOXIA defines the lack of free molecular oxygen in an environment In the presence of organic matter anaerobic…
prokaryotes produce compounds such as free radicals hydrogen sulfide or methane that are typically toxic to aerobes The concomitance of suppressed respiration and presence of toxic substances suggests these habitats are inhospitable to Eukaryota Ecologists sometimes term such environments Death Zones This book presents however a collection of remarkable adaptations to anoxia observed in Eukaryotes such as protists animals plants and fungi Case studies provide evidence for controlled beneficial use of anoxia by for example modification of free radicals use of alternative electron donors for anaerobic metabolic pathways and employment of anaerobic symbionts The complex interwoven existence of oxic and anoxic conditions in space and time is also highlighted as is the idea that eukaryotic inhabitation of anoxic habitats was established early in Earth historyPar Jack Horner, James Gorman. 2009
A world-renowned paleontologist reveals groundbreaking science that trumps science fiction: how to grow a living dinosaur Over a decade after…
Jurassic Park, Jack Horner and his colleagues in molecular biology labs are in the process of building the technology to create a real dinosaur. Based on new research in evolutionary developmental biology on how a few select cells grow to create arms, legs, eyes, and brains that function together, Jack Horner takes the science a step further in a plan to "reverse evolution" and reveals the awesome, even frightening, power being acquired to recreate the prehistoric past. The key is the dinosaur's genetic code that lives on in modern birds- even chickens. From cutting-edge biology labs to field digs underneath the Montana sun, How to Build a Dinosaur explains and enlightens an awesome new science.Par Tony Waldron. 2009
Paleopathology is designed to help bone specialists with diagnosis of diseases in skeletal assemblages. It suggests an innovative method of…
arriving at a diagnosis in the skeleton by applying what are referred to as "operational definitions. " The aim is to ensure that all those who study bones will use the same criteria for diagnosing disease, which will enable valid comparisons to be made between studies. This book is based on modern clinical knowledge and provides background information so that those who read will understand the natural history of bone diseases, and this will enable them to draw reliable conclusions from their observations. Details of bone metabolism and the fundamentals of basic pathology are also provided, as well as a comprehensive and up-to-date bibliography. A short chapter on epidemiology provides information on how best to analyze and present the results of a study of human remains.Par David J. Bottjer, Warren Allmon. 2001
One of the most important questions we can ask about life is "Does ecology matter?" Most biologists and paleontologists are…
trained to answer "yes," but the exact mechanisms by which ecology matters in the context of patterns that play out over millions of years have never been entirely clear. This book examines these mechanisms and looks at how ancient environments affected evolution, focusing on long-term macroevolutionary changes as seen in the fossil record. Evolutionary paleoecology is not a new discipline. Beginning with Darwin, researchers have attempted to understand how the environment has affected evolutionary history. But as we learn more about these patterns, the search for a new synthetic view of the evolutionary process that integrates species evolution, ecology, and mass extinctions becomes ever more pressing. The present volume is a benchmark sampler of active research in this ever more active field.P.K. Strother, ChoicePar Carl Zimmer, Walter Alvarez. 1997
Sixty-five million years ago, a comet or asteroid larger than Mt. Everest slammed into the Earth, causing an explosion equivalent…
to the detonation of a hundred million hydrogen bombs. Vaporized impactor and debris from the impact site were blasted out through the atmosphere, falling back to Earth all around the globe. Terrible environmental disasters ensued, including a giant tsunami, continent-scale wildfires, darkness, and cold, followed by sweltering greenhouse heat. When conditions returned to normal, half the genera of plants and animals on Earth had perished.This horrific story is now widely accepted as the solution to a great scientific murder mystery what caused the extinction of the dinosaurs? In T. rex and the Crater of Doom, the story of the scientific detective work that went into solving the mystery is told by geologist Walter Alvarez, one of the four Berkeley scientists who discovered the first evidence for the giant impact. It is a saga of high adventure in remote parts of the world, of patient data collection, of lonely intellectual struggle, of long periods of frustration ended by sudden breakthroughs, of intense public debate, of friendships made or lost, of the exhilaration of discovery, and of delight as a fascinating story unfolded.Controversial and widely attacked during the 1980s, the impact theory received confirmation from the discovery of the giant impact crater it predicted, buried deep beneath younger strata at the north coast of the Yucatán Peninsula. The Chicxulub Crater was found by Mexican geologists in 1950 but remained almost unknown to scientists elsewhere until 1991, when it was recognized as the largest impact crater on this planet, dating precisely from the time of the great extinction sixty-five million years ago. Geology and paleontology, sciences that long held that all changes in Earth history have been calm and gradual, have now been forced to recognize the critical role played by rare but devastating catastrophes like the impact that killed the dinosaurs.Par Kenneth Carpenter. 2007
Horns and Beaks completes Ken Carpenter's series on the major dinosaur types. As with his volumes on armored, carnivorous, and…
sauropodomorph dinosaurs, this book collects original and new information, reflecting the latest discoveries and research on these two groups of animals. The Ornithopods include Iguanodon, one of the first dinosaurs ever discovered and analyzed, and perhaps the most common and best-documented group, the hadrosaurs or "duckbilled dinosaurs." The Ceratopsians include Triceratops, known for its distinctive three-horned skull and protective collar.Contributors are Michael K. Brett-Surman, Kathleen Brill, Kenneth Carpenter, Benjamin S. Creisler, Tony DiCroce, Andrew A. Farke, Peter M. Galton, David Gilpin, Thomas M. Lehman, Nate L. Murphy, Christopher J. Ott, Gregory S. Paul, Xabier Pereda Suberbiola, Albert Prieto-Marquez, Bruce Rothschild, José Ignacio Ruiz-Omeñaca, Darren H. Tanke, Mark Thompson, David Trexler, and Jonathan R. Wagner.Par Dale A. Russell. 2009
How is it that we came to be here? The search for answers to that question has preoccupied humans for…
millennia. Scientists have sought clues in the genes of living things, in the physical environments of Earth from mountaintops to the depths of the ocean, in the chemistry of this world and those nearby, in the tiniest particles of matter, and in the deepest reaches of space. In Islands of the Cosmos, Dale A. Russell traces a path from the dawn of the universe to speculations about our future on this planet. He centers his story on the physical and biological processes in evolution, which interact to favor more successful, and eliminate less successful, forms of life. Marvelously, these processes reveal latent possibilities in life's basic structure, and propel a major evolutionary theme: the increasing proficiency of biological function. It remains to be seen whether the human form can survive the dynamic processes that brought it into existence. Yet the emergence of the ability to acquire knowledge from experience, to optimize behavior, to conceptualize, to distinguish "good" from "bad" behavior all hint at an evolutionary outcome that science is only beginning to understand.Par John Foster. 2014
This volume, aimed at the general reader, presents life and times of the amazing animals that inhabited Earth more than…
500 million years ago. The Cambrian Period was a critical time in Earth's history. During this immense span of time nearly every modern group of animals appeared. Although life had been around for more than 2 million millennia, Cambrian rocks preserve the record of the first appearance of complex animals with eyes, protective skeletons, antennae, and complex ecologies. Grazing, predation, and multi-tiered ecosystems with animals living in, on, or above the sea floor became common. The cascade of interaction led to an ever-increasing diversification of animal body types. By the end of the period, the ancestors of sponges, corals, jellyfish, worms, mollusks, brachiopods, arthropods, echinoderms, and vertebrates were all in place. The evidence of this Cambrian "explosion" is preserved in rocks all over the world, including North America, where the seemingly strange animals of the period are preserved in exquisite detail in deposits such as the Burgess Shale in British Columbia. Cambrian Ocean World tells the story of what is, for us, the most important period in our planet's long history.Par Bob Barner. 2001
With a lively rhyming text and vibrant, paper-collage illustrations, author-artist Bob Barner shakes the dust off the dinosaur bones found…
in museums and reminds readers that these fossils once belonged to living, breathing creatures. Filled with fun dinosaur facts (a Tyrannosaurus rex skull can weigh up to 750 pounds!) and an informational "Dinometer," Dinosaur Bones is sure to make young dinosaur enthusiasts roar with delight.Nineteenth-century paleontologists boasted that, shown a single bone, they could identify or even reconstruct the extinct creature it came from…
with infallible certainty--"Show me the bone, and I will describe the animal!" Paleontologists such as Georges Cuvier and Richard Owen were heralded as scientific virtuosos, sometimes even veritable wizards, capable of resurrecting the denizens of an ancient past from a mere glance at a fragmentary bone. Such extraordinary feats of predictive reasoning relied on the law of correlation, which proposed that each element of an animal corresponds mutually with each of the others, so that a carnivorous tooth must be accompanied by a certain kind of jawbone, neck, stomach, limbs, and feet. Show Me the Bone tells the story of the rise and fall of this famous claim, tracing its fortunes from Europe to America and showing how it persisted in popular science and literature and shaped the practices of paleontologists long after the method on which it was based had been refuted. In so doing, Gowan Dawson reveals how decisively the practices of the scientific elite were--and still are--shaped by their interactions with the general public.Par J. M. Bedell. 2015
Have you ever been excited by forensic science or psyched to dig up fossils? This comprehensive guide reveals a whole…
host of careers in the underrated world of the no-longer-living.Covering everything from well known jobs like archaeologists, morticians, coroners, and forensic scientists to the not-so-well-known professions like studying dead stars and planets to playing a zombie on TV, So, You Want to Work With the Ancient and Recent Dead? uncovers a treasure trove of occupational opportunities. In addition to tips and interviews from professionals in the industry, So, You Want to Work With the Ancient and Recent Dead? includes inspiring stories from kids who are working toward an exciting career in the area of "dead things" as well as activities, a glossary, and resources to help you unearth your interests and discover a successful career.Par Fay Robinson. 1999
Found in the Badlands of South Dakota in 1990, "Sue" the dinosaur is the largest and most complete T-Rex fossil…
ever discovered. Young readers can learn about her amazing story, from the beginning to the exciting restoration work leading up to her spring 2000 debut.Par Scott D. Sampson. 2009
Situating the fascinating animals in a broad ecological and evolutionary context, leading dinosaur expert Scott D. Sampson fills us in…
on the exhilarating discoveries of the past twenty-five years, the most active period in the history of dinosaur paleontology, during which more "new" species were named than in all prior history.Par Frank H. Rhodes. 2016
"Fossils are the fragments from which, piece by laborious piece, the great mosaic of the history of life has been…
constructed. Here and there, we can supplement these meager scraps by the use of biochemical markers or geochemical signatures that add useful information, but, even with such additional help, our reconstructions and our models of descent are often tentative. For the fossil record is, as we have seen, as biased as it is incomplete. But fragmentary, selective, and biased though it is, the fossil record, with all its imperfections, is still a treasure. Though whole chapters are missing, many pages lost, and the earliest pages so damaged as to be, as yet, virtually unreadable, this—the greatest biography of all—is one in whose closing pages we find ourselves."—from OriginsIn Origins, Frank H. T. Rhodes explores the origin and evolution of living things, the changing environments in which they have developed, and the challenges we now face on an increasingly crowded and polluted planet. Rhodes argues that the future well-being of our burgeoning population depends in no small part on our understanding of life's past, its long and slow development, and its intricate interdependencies.Rhodes’s accessible and extensively illustrated treatment of the origins narrative describes the nature of the search for prehistoric life, the significance of geologic time, the origin of life, the emergence and spread of flora and fauna, the evolution of primates, and the emergence of modern humans.Par Pratul Kumar Saraswati, M. S. Srinivasan. 2016
This book will help readers learn the basic skills needed to study microfossils especially those without a formal background in…
paleontology. It details key principles, explains how to identify different groups of microfossils, and provides insight into their potential applications in solving geologic problems. Basic principles are addressed with examples that explore the strengths and limitations of microfossils and their geological records. This overview provides an understanding of taphonomy and quality of the fossil records, biomineralization and biogeochemistry, taxonomy, concepts of species, and basic concepts of ecology. Readers learn about the major groups of microfossils, including their morphology, ecology, and geologic history. Coverage includes: foraminifera, ostracoda, coccolithophores, pteropods, radiolaria, diatoms, silicoflagellates, conodonts, dinoflagellates, acritarch, and spores and pollens. In this coverage, marine microfossils, and particularly foraminifera, are discussed in more detail compared with the other groups as they continue to play a major role in most scientific investigations. Among the various tracers of earth history, microfossils provide the most diverse kinds of information to earth scientists. This richly illustrated volume will help students and professionals understand microfossils, and provide insight on how to work with them to better understand evolution of life, and age and the paleoenvironment of sedimentary strata.Par Donald R. Prothero. 2007
Over the past twenty years, paleontologists have made tremendous fossil discoveries, including fossils that mark the growth of whales, manatees,…
and seals from land mammals and the origins of elephants, horses, and rhinos. Today there exists an amazing diversity of fossil humans, suggesting we walked upright long before we acquired large brains, and new evidence from molecules that enable scientists to decipher the tree of life as never before. The fossil record is now one of the strongest lines of evidence for evolution. In this engaging and richly illustrated book, Donald R. Prothero weaves an entertaining though intellectually rigorous history out of the transitional forms and series that dot the fossil record. Beginning with a brief discussion of the nature of science and the "monkey business of creationism," Prothero tackles subjects ranging from flood geology and rock dating to neo-Darwinism and macroevolution. He covers the ingredients of the primordial soup, the effects of communal living, invertebrate transitions, the development of the backbone, the reign of the dinosaurs, the mammalian explosion, and the leap from chimpanzee to human. Prothero pays particular attention to the recent discovery of "missing links" that complete the fossil timeline and details the debate between biologists over the mechanisms driving the evolutionary process. Evolution is an absorbing combination of firsthand observation, scientific discovery, and trenchant analysis. With the teaching of evolution still an issue, there couldn't be a better moment for a book clarifying the nature and value of fossil evidence. Widely recognized as a leading expert in his field, Prothero demonstrates that the transformation of life on this planet is far more awe inspiring than the narrow view of extremists.Par Thomas W. Swetnam, Malcolm K. Hughes, Henry F. Diaz. 2011
A top priority in climate research is obtaining broad-extent and long-term data to support analyses of historical patterns and trends,…
and for model development and evaluation. Along with directly measured climate data from the present and recent past, it is important to obtain estimates of long past climate variations spanning multiple centuries and millennia. These longer time perspectives are needed for assessing the unusualness of recent climate changes, as well as for providing insight on the range, variation and overall dynamics of the climate system over time spans exceeding available records from instruments, such as rain gauges and thermometers. Tree rings have become increasingly valuable in providing this long-term information because extensive data networks have been developed in temperate and boreal zones of the Earth, and quantitative methods for analyzing these data have advanced. Tree rings are among the most useful paleoclimate information sources available because they provide a high degree of chronological accuracy, high replication, and extensive spatial coverage spanning recent centuries. With the expansion and extension of tree-ring data and analytical capacity new climatic insights from tree rings are being used in a variety of applications, including for interpretation of past changes in ecosystems and human societies. This volume presents an overview of the current state of dendroclimatology, its contributions over the last 30 years, and its future potential. The material included is useful not only to those who generate tree-ring records of past climate-dendroclimatologists, but also to users of their results-climatologists, hydrologists, ecologists and archeologists. 'With the pressing climatic questions of the 21st century demanding a deeper understanding of the climate system and our impact upon it, this thoughtful volume comes at critical moment. It will be of fundamental importance in not only guiding researchers, but in educating scientists and the interested lay person on the both incredible power and potential pitfalls of reconstructing climate using tree-ring analysis.', Glen M. MacDonald, UCLA Institute of the Environment, CA, USA 'This is an up-to-date treatment of all branches of tree-ring science, by the world's experts in the field, reminding us that tree rings are the most important source of proxy data on climate change. Should be read by all budding dendrochronology scientists.', Alan Robock, Rutgers University, NJ, USAPar Ian Tattersall, Winfried Henke. 2015
This extensive, three-volume handbook, intensively updated and enlarged, is a superb new resource for students, researchers, and practitioners in paleoanthropology.…
A baseline storehouse covering the full extent of current knowledge, the volume features an online e-reference work that will be updated with future developments in this fascinating discipline. Often cited as the most multidisciplinary of all the sciences, paleoanthropology encompasses a vast range of techniques drawn from geology, evolutionary biology, and archaeology, among many others. Guided by an editorial team of global stature, the contributions reflect the best of today's scholarship. Each volume covers core constituents of the subject: basic principles and methods, primate evolution and human origins, and the phylogeny of hominins. The editors have ensured that the entries uphold a key principle of paleoanthropology, requiring historical assessments to be updated with developing knowledge of the living world. The handbook's first volume incorporates the enormous advances made in such areas as phylogenetic analysis, paleoecology and evolutionary theory and philosophy. Volume II integrates primate fossil data with the vast amount that is now known of the behavior and ecology of living primates in natural environments. The third volume deals with the fossil and molecular evidence for the evolution of Homo sapiens and its fossil relatives. Paleoanthropology is characterized by its many live and unresolved academic debates, which are reflected in the heterogeneity of intellectual standpoints in this handbook. This planned diversity ensures that the Springer Handbook of Paleoanthropology is a multilayered, comprehensive companion of inestimable value to students, academics, and working professionals alike.Par Florentin Paris, Mary L. Droser, Ian G. Percival, Barry D. Webby. 2004
Two of the greatest evolutionary events in the history of life on Earth occurred during Early Paleozoic time. The first…
was the Cambrian explosion of skeletonized marine animals about 540 million years ago. The second was the "Great Ordovician Biodiversification Event," which is the focus of this book. This is the first book devoted specifically to establishing the global patterns of differentiation of Ordovician biotas through time and space. It provides extensive genus- and species-level diversity data for the many Ordovician fossil groups and presents an evaluation of how each group diversified, with assessments of patterns of change, and rates of origination and extinction.Par Friðgeir Grimsson, Leifur A. Símonarson, Reinhard Zetter, Thomas Denk. 2010
Being the only place in the northern North Atlantic yielding late Cainozoic terrestrial sediments rich in plant fossils, Iceland provides…
a unique archive for vegetation and climate development in this region. This book includes the complete plant fossil record from Iceland spanning the past 15 million years. Eleven sedimentary rock formations containing over 320 plant taxa are described. For each flora, palaeoecology and floristic affinities within the Northern Hemisphere are established. The exceptional fossil record allows a deeper understanding of the role of the "North Atlantic Land Bridge" for intercontinental plant migration and of the Gulf Stream-North Atlantic Current system for regional climatic evolution. 'Iceland sits as a "fossil trap" on one of the most interesting biogeographic exchange routes on the planet - the North Atlantic. The fossil floras of Iceland document both local vegetational response to global climate change, and more importantly, help to document the nature of biotic migration across the North Atlantic in the last 15 million years. In this state-of-the-art volume, the authors place sequential floras in their paleogeographic, paleoclimatic and geologic context, and extract a detailed history of biotic response to the dynamics of physical change.' Bruce H. Tiffney, University of California, Santa Barbara 'This beautifully-illustrated monograph of the macro- and microfloras from the late Cenozoic of Iceland is a worthy successor to Oswald Heer's "Flora fossilis arctica". Its broad scope makes it a must for all scientists interested in climatic change and palaeobiogeography in the North Atlantic region. It will remain a classic for years to come.' David K. Ferguson, University of Vienna