Springer nature sep 2011 (111 resultados)

Taschenbuch. Condición: Neu. Neuware - The relationship between thought, language, and the world is an intimate one. When we have an idea or thought about the world and we wish to express that idea or thought to others we utter a sentence or make a statement. If the statement correctly describes the world then it is true. Moreover, it seems as though our ability to have more complex or sophisticated thoughts about the world increases as the complexity of our language or our ability to use the language increases. Understanding the complex relationship between language, thought, and the world is one of the central aims of philosophy. This book is an attempt to increase our understanding of this complex relationship by focusing on certain philosophical issues that arise from our ability to refer to objects in the world though the use of language. In particular, it is an attempt to solve the puzzles of reference and belief that Frege and Russell presented within the context of a theory of direct reference for proper names.…

Taschenbuch. Condición: Neu. Neuware - Volume 8 of Advances in Nutritional Research deals with several topics of prime current interest in nutritional research, including the role of nutrition in hypertension, in the infections associated with protein-energy malnu trition, and in pathological conditions associated with the generation of oxygen radicals in the tissues, as well as with topics of ongoing interest. Recent research indicates that reduction of obesity, of alcohol intake, and of sodium intake by salt-sensitive individuals, are the most effective non pharmacological means of reducing high blood pressure. A new approach to therapy for infections caused by protein-energy malnutrition, based on restoration of immunocompetence by administration of thyroid and anti glucocorticoid hormones, is presented. Current research into the role of nutrition in modulating tissue damage caused by oxygen radicals generated in various pathologies is reviewed. Two chapters deal with perinatal nutrition, one with the transfer of nutrients across the placenta and the other with the energy requirements of term and preterm infants. Another dicusses methods of assessing the nutritional status of hospitalized patients. vii Contents Chapter 1. The Transfer of Nutrients across the Perfused Human Placenta . . Joseph Dands 1. Introduction. 1 2. Comments on Comparative Placentology . . . . . . . . . . .- . . 1 . 3. The Perfusion Technique . . . . . . . . . . . . . . . . . . . . 3 . . . . 4. Review of Transfer Experiments . 3 4.1. Transfer of Glutamic Acid . 3 4.2. Transfer of Riboflavin . . . . . . . . . . . . . . . -. . . 6 . . . 5. Potentials and Umltations . . . . . . . . . . . . . . . . . . . 9 . . . .References . . . . . . . . . . . . . . . . . . . . . . . . . . 10 . . . . . .…

Taschenbuch. Condición: Neu. Neuware - Computing systems researchers confront two serious problems. (1) The increasingly monolithic, or pseudo-monolithic, integration of complex com puting functions and systems imposes an environment which integrates ad vanced principles and techniques from a broad variety of fields. Researchers not only must confront the increased complexity of topics in their specialty field but also must develop a deeper general understanding of a broadening number of fields. (2) There has been a proliferation of journals, books, workshops and conferences through which research results are reported. Remaining familiar with recent advances in our specific fields is a major challenge. Casually browsing through journals and conference proceedings to remain aware of developments in areas outside our specialization has become an even greater challenge. Frontiers of Computing Systems Research has been established to ad dress these two issues. With the assistance of an advisory board of experts from a wide variety of specialized areas, we hope to provide roughly annual volumes of invited chapters on a broad range of topics and designed for an interdisciplinary research audience. No single volume can cover all the rel evant topics and no single article can convey the full set of directions being pursued within a given topic. For this reason, a chapter listing technical reports available from universities is also included. Often, such unpub lished reports are designed for a general research audience and provide a good, informal look at trends in specialized research topics.…

Taschenbuch. Condición: Neu. Neuware - For some time now, the study of cognitive development has been far and away the most active discipline within developmental psychology. Although there would be much disagreement as to the exact proportion of papers published in develop mental journals that could be considered cognitive, 50% seems like a conserva tive estimate. Hence, a series of scholarly books devoted to work in cognitive development is especially appropriate at this time. The Springer Series in Cognitive Development contains two basic types of books, namely, edited collections of original chapters by several autbors, and original volumes written by one author or a small group of authors. The flagship for the Springer Series is a serial publication of the 'advances' types, carrying the sub title Progress in Cognitive Development Research. Each volume in the Progress sequence is strongly thematic, in that it is limited to some well-defmed domain of cognitive-developmental research (e. g. , logical and mathematical development, development of learning). All Progress volumes will be edited collections. Editors of such collections, upon consultation with the Series Editor, may elect to have their books published either as contributions to the Progress sequence or as sepa rate volumes. All books written by one author or a small group of authors are being published as separate volumes within the series. A fairly broad defmition of cognitive development is being used in the selec tion of books for this series.…

Taschenbuch. Condición: Neu. Neuware - Carnivores have always fascinated us, even though they make up only 10% of all mammalian genera and only about 2 % of all mammalian biomass. In Greek mythology most of the gods adorned their robes and helmets with depictions of carnivores, and the great hero Hercules' most famous feat was killing the 'invulnerable' lion with his bare hands. Part of our fascination with carnivores stems from fright and intrigue, and sometimes even hatred because of our direct competition with them. Cases of 'man-eating' lions, bears, and wolves, as well as carnivores' reputation as killers of livestock and game, provoke communities and govermllents to adopt sweeping policies to exterminate them. Even President Theodore Roosevelt, proclaimer of a new wildlife protectionism, described the wolf as 'the beast of waste and desolation. ' The sheer presence and power of carnivores is daunt- ing: they can move quickly yet silently through forests, attaining rapid bursts of speed when necessary; their massive muscles are aligned to deliver powerful attacks, their large canines and strong jaws rip open carcasses, and their scis- sor-like carnassials slice meat. Partly because of our fear of these attributes, trophy hunting of carnivores has been, and to a certain extent still is, a sign of bravery and skill. Among some Alaskan Inuit, for example, a man is not eligible for marriage until he has killed a succession of animals of increasing size and dangerousness, culminating with the most menacing, the polar bear.…

Taschenbuch. Condición: Neu. Neuware - I. Introduction.- 1. Law and Economics and the Economics of Legal Regulation.- II. Law and Economics.- 2. Efficiency, Equity and Inalienability.- 3. Negotiated Settlement.- 4. Economic Efficiency and the Common Law: A Critical Survey.- 5. Default Risk and the Optimal Pricing of Court Enforcement Services.- 6. Transaction Cost and Communication.- III. Economics of Legal Regulation.- 7. Regulatory Measures to Enforce Quality Production of Self- Employed Professionals - a theoretical study of a dynamic market process.- 8. Controlling Insider Trading in Europe and America: The Economics of the Politics.- 9. The Regulation of Shop Opening Hours in the United Kingdom.- 10. Belgian Pulbic Policy Towards the Retailing Trade.- 11. Assessing the Effectiveness of Economic Efficiency of an E.E.C. Pollution Control Directive: The Control of Discharges of Mercury to the Aquatic Environment.- Participants of the Conference on Law and Economics, Berlin.…

Taschenbuch. Condición: Neu. Neuware - The old ways break down, times change, and new life blossoms from the ruins. Frederich Schiller These words of a great poet express a basic fact of life-the inevitability of change. If marketers were asked to envision the future, they would not hesitate to answer that the entire globe is involved in a human revolution like no other in history. The changes now taking place, in both industrially developed and developing nations, are indications of the problems, chal lenges, and opportunities confronting future economic growth and development. Perhaps the most prominent characteristic of this change is the growing economic interdependence of all nations. Today it seems quite unnecessary to point out that any nation's problems and opportunities anywhere are now every nation's problems and opportunities everywhere. This economic and business interdependence on a global scale is the new reality, regardless of whether we want to accept it. The task ahead for all corporate managers becomes one of adapting to this new international business reality. It also requires them to assume the leadership role in helping individuals of all nations to become more and more aware of their mutual need for another's products and services. Today every corporation, whether confined within one nation or not, operates in this dynamic, changing, international business environment.…

Taschenbuch. Condición: Neu. Neuware - The relationship between inputs and outputs of nitrogen in intensive grassland systems.- The response to nitrogen fertilizer from a cut perennial ryegrass (Lolium perenne L.) pasture in the Scottish uplands relative to efficiency of fertilizer use and provision of herbage for animals.- Efficient use of fertilizer nitrogen on grass swards: effects of timing, cutting management and secondary grasses.- Nitrogen supply and the persistence of grasses.- Sources and transformations of organic nitrogen in intensively managed grassland soils.- Gaseous losses of nitrogen from grassland.- Relationships between soil mineral nitrogen content and denitrification, following application of slurry and calcium nitrate to grassland.- Losses of nitrogen from intensive grassland systems by leaching and surface runoff.- Nitrate loss through leaching and surface runoff from grassland: effects of water supply, soil type and management.…

Taschenbuch. Condición: Neu. Neuware - This publication contains proceedings of a Seminar on GLUCOSINOLATES IN RAPESEEDS - Analytical Aspects, held in Gembloux (Belgium) from 1 to 3 October 1986. The meeting was organized by request of the Commission of the European Communities in the context of the CEC Programme of Research on Plant Productivity. The main aim of the Seminar was to contribute to the elaboration of reliable quantitative methods for glucosinolate determination in rapeseeds. Fourty Experts from thirteen countries participated in this Seminar. Original contributions which were considered of special importance for the subject covered by the Seminar were presented and discussed. Thanks are due to the Chairmen, Dr. Heaney R., Dr. Biston R., Dr. Ri baillier D., Prof. Dr. Robbelen G., authors and participants in the meeting for their contributions, friendliness and cooperation. Special thanks go to Dr. Mc Gregor (Canada) and Dr. Uppstrom B. (Swe den) who gave Members the benefit of their knowledge. Finally, I would also like to thank those who have helped in organizing this Seminar Director Lecomte R. (Centre de Recherches Agronomiques de l'Etat, Gembloux), Rector Ledent A. (Faculte des Sciences Agronomiques de l'Etat, Gembloux), Prof. Severin M., Dr. Biston R., Mrs Bock and all my colleagues.…

Taschenbuch. Condición: Neu. Neuware - Most papers published in this volume are based on lectures presented at the Chico Conference on Semigroups held on the Chico campus of the Cal ifornia State University on April 10-12, 1986. The conference was spon sored by the California State University, Chico in cooperation with the Engineering Computer Sciences Department of the Pacific Gas and Electric Company. The program included seven 50-minute addresses and seventeen 30-minute lectures. Speakers were invited by the organizing committee consisting of S. M. Goberstein and P. M. Higgins. The purpose of the conference was to bring together some of the leading researchers in the area of semigroup theory for a discussion of major recent developments in the field. The algebraic theory of semigroups is growing so rapidly and new important results are being produced at such a rate that the need for another meeting was well justified. It was hoped that the conference would help to disseminate new results more rapidly among those working in semi groups and related areas and that the exchange of ideas would stimulate research in the subject even further. These hopes were realized beyond all expectations.…

Taschenbuch. Condición: Neu. Neuware - Interest and initiatives in agroforestry education and training, as in other aspects of agroforestry development, have increased tremendously during the past decade. Coordination of such educational activities was initiated by the first international workshop on education in agroforestry organized by the International Council for Research in Agroforestry (ICRAF) in Decem ber 1982, at Nairobi, Kenya. Since then, agroforestry has been incorporated into the curricula of many educational and training institutions around the world. Moreover, several institutions have developed entire academic programs specifically in agroforestry. However, most of these activities are still isolated initiatives, without common strategies or philosophies. This second international agroforestry workshop was therefore planned to pro vide a forum for reviewing progress, sharing programs and experiences, and planning and coordinating future directions in agroforestry education and training. The main objectives were to review the on-going programs, to assess the scope of professional education and training in relation to the perceived needs of trained personnel, to recommend guidelines for further program development, and to establish networking among institutions and agencies involved in agroforestry education and training. These proceedings contain the keynote papers, regional/country presenta tions and conclusions and recommendations of the International Workshop on Education and Training in Agroforestry held at the University of Florida, Gainesville, USA in December, 1988. The strategy of the workshop was to facilitate focused discussion on identified issues by an invited group of world leaders in agroforestry education and training.…

Taschenbuch. Condición: Neu. Neuware - 1 A Paean to the Follow-up.- I Follow-up Studies.- 2 Risks for Alcoholism by Age and Class among Males.- 3 Children of Alcoholic Fathers-A Longitudinal Prospective Study.- 4 The Longitudinal Course of Alcoholism among Women Criminals: A Six-Year Follow-up.- 5 Natural History of Male Alcoholism.- 6 Causal Models of Personality, Peer Culture Characteristics, Drug Use, and Criminal Behaviors over a Five-year Span.- II High-Risk Studies.- 7 Studies of Familial Alcoholism: A Growth Industry.- 8 A Danish Prospective Study of Young Males at High Risk for Alcoholism.- 9 A Prospective Study of Alcoholism: Electroencephalographic Findings.- 10 Prospective Markers for Alcoholism.- III Typological Studies.- 11 Subtyping Alcoholics by Coexisting Psychiatric Syndromes: Course, Family History, Outcome.- 12 Antisocial Behavior, Psychopathology, and Problem Drinking in the Natural History of Alcoholism.…

Taschenbuch. Condición: Neu. Neuware - Karl Brunner Monetary affairs have preoccupied observers over the ages. In the middle of the 14th century, the chaos in the French currency system after many rounds of currency debasement attracted comments expressing helpless confusion. Goethe's Mephistopheles convinced the imperial court to inflate with paper money 'for the benefit of the public' and to satisfy all the demands on the government's largesse. Our century is no exception. The massive technological improvement in creating money has contributed to hyperinflationary experiences never before recorded in history. These events occurred, however, in the political disarray following major wars. More important are the persistent pe ace time failures of our monetary institutions. A massive worldwide deflation, centered in the United States and Germany, imposed a tragic social and political fate on Western societies. Similarly, the sequence of a worldwide inflation followed by deflation observed over the past 15 years has fostered disruptive economic and political conditions. The monetary disarray experienced throughout history was crucially influenced by the prevailing monetary arrangements. These arrangements determine the level and movement of the nation's money stock over time. Under the circumstances, the political issue confronting us bears on the useful choice of monetary arrangements. This choice should involve institutions that prohibit both massive deflation and persistent inflation.…

Taschenbuch. Condición: Neu. Neuware - Reviews of Environmental Contamination and Toxicology contains timely review articles concerned with all aspects of chemical contaminants (including pesticides) in the total environment, including toxicological considerations and consequences. It attempts to provide concise, critical reviews of advances, philosophy, and significant areas of accomplished or needed endeavor in the total field of residues of these and other foreign chemicals in any segment of the environment, as well as toxicological implications.…

Taschenbuch. Condición: Neu. Neuware - Wireless personal communications, or wireless as it is now being called, has arrived. The hype is starting to fade, and the hard work of deploying new systems and services for personal communications is underway. In the United States, the FCC propelled the wireless era from infancy to mainstream with a $7.7 billion auction of 60 MHz of radio spectrum in the 180011900 MHz band. With the largest single sale of public property in the history of mankind mostly complete, the resources of the entire world are being called upon to develop inexpensive, rapidly deployable wireless systems and sub scriber units for an industry that is adding subscribers at greater than 50% annual rate. This growth is commonplace for wireless service companies throughout the world, and in the U.S., where as many as 7 licensed wireless service providers may be competing for cellularfPCS customers within the next couple of years, differentiators in cost, qual ity, service, and coverage will become critical to customer acceptance and use. Many of these issues are discussed in the papers included in this book.…

Taschenbuch. Condición: Neu. Neuware - Computer vision researchers have been frustrated in their attempts to automatically derive depth information from conventional two-dimensional intensity images. Research on 'shape from texture', 'shape from shading', and 'shape from focus' is still in a laboratory stage and had not seen much use in commercial machine vision systems. A range image or a depth map contains explicit information about the distance from the sensor to the object surfaces within the field of view in the scene. Information about 'surface geometry' which is important for, say, three-dimensional object recognition is more easily extracted from '2 1/2 D' range images than from '2D' intensity images. As a result, both active sensors such as laser range finders and passive techniques such as multi-camera stereo vision are being increasingly utilized by vision researchers to solve a variety of problems. This book contains chapters written by distinguished computer vision researchers covering the following areas: Overview of 3D Vision Range Sensing Geometric Processing Object Recognition Navigation Inspection Multisensor Fusion A workshop report, written by the editors, also appears in the book. It summarizes the state of the art and proposes future research directions in range image sensing, processing, interpretation, and applications. The book also contains an extensive, up-to-date bibliography on the above topics. This book provides a unique perspective on the problem of three-dimensional sensing and processing; it is the only comprehensive collection of papers devoted to range images. Both academic researchers interested in research issues in 3D vision and industrial engineers in search of solutions to particular problems will find this a useful reference book.…

Taschenbuch. Condición: Neu. Neuware - Ever since the early 1960s, the medical ical records. Expert assistance in di issue might contain a review of an office agnosis and treatment selection will be world has awaited the promise of com practice management system-of in as close as the nearest telephone, which terest to the physician, nurse, and office puterization. Many of us were fasci will provide an immediate link to the nated by the efforts of the pioneers: practice manager. Next to it might be Homer Warner's computerized diag office computer. found a detailed article about a language nosis system, Octo Barnett's medical Since 1983, M,D. Computing has such as LISP and how it could be ap information system, Howard Bleich's explored and explained all of these as plied to medical problems, or a tutorial pects. Our magazine's major focus is on about real-time monitoring of a patient's automated acid/base consultant' and Warner Slack's history-taking program computer systems that serve the health physiological state, along with book re were foretastes of what was to come. provider in the home or office environ views and departments reporting on At first, however, physicians and hos ment. M. D, Computing has also ex pertinent computer news. pital personnel resisted the computer amined more general computer appli In several cases, a distinct theme because it was too slow, too fragile, too cations in medical care.…

Taschenbuch. Condición: Neu. Neuware - Cytological screening for the identification of intraepithelial neoplasia of the cervix as a precursor lesion for cervical cancer has been well established as an effective means for decreasing the incidence of invasive carcinoma. Despite these screening efforts, carcinoma of the cervix remains one of the more common malignancies in women and it is the leading cause of cancer death in many countries in the western hemisphere. It is estimated that in 1986 there will still be 14,000 new cases of invasive cancer, with 6,800 deaths in the United States alone. Unfortunately, many of these patients present with advanced disease, posing difficult management problems for the clinician responsible for their care. The treatment of early stage invasive carcinoma of the cervix (lesions confined to the cervix and vagina) remains either radical surgery, radical radiation therapy or a combination thereof This approach is extraordinarily effective in the vast majority of patients. However, there remains a subset of patients with early stage disease that are at high risk for recurrence. Dr Kjorstad (Chapter 2) has identified adenocarcinomas and adenosqua mous carcinomas as having a particularly poor prognosis. In addition, patients with more than three positive lymph nodes or with involvement of lymph nodes outside of the pelvis have a very poor prognosis. He has iden tified the CEA as a potentially predictive marker for these patients with poor prognosis, especially in patients with adenocarcinomas.…

Taschenbuch. Condición: Neu. Neuware - Trends in the life-history styles of vertebrates: an introduction to the second ALHS volume.- Editorial.- Underwater observations of piranhas in western Brazil.- Invited reviews.- Alternative life-history styles of cartilaginous fishes in time and space.- Clupeoid life-history styles in variable environments.- Alternative life-history styles of some African cichlid fishes.- Alternative life-history styles of Japanese freshwater sculpins revisited.- Alternative reproductive styles in seabreams (Pisces: Sparidae).- Patterns of gonad structure in hermaphroditic gobies (Teleostei: Gobiidae).- Comparisons between the roles played by estuaries in the life cycles of fishes in temperate Western Australia and Southern Africa.- Full papers.- The proportion of different eco-ethological sections of reproductive guilds of fishes in some African inland waters.- A functional analysis of grazing in parrotfishes (family Scaridae): the ecological implications.- The reproductive biology and early development of the African pike, Hepsetus odoe, in the Okavango Delta, Botswana.- Reproductive and habitat isolation between two populations of the striated spined loach.- Alternative reproductive behaviour in fishes, with particular reference to Lepomis macrochira and Pseudocrenilabrus philander.- Genetic divergence between the sibling species of river-sculpin, Cottus amblystomopsis and C. nozawae, with special reference to speciation.- Life-history styles and somatic allocation in iteroparous arctic charr and semelparous pink salmon.- Sexual selection, reproductive behavior, and speciation in the mbuna species flock of Lake Malawi (Pisces: Cichlidae).- A preliminary investigation of sex change in Pseudotropheus lombardoi (Pisces: Cichlidae).- Life-history styles of fishes in South African estuaries.- Conclusion.- The conservation of alternative life-history styles: a conclusion to the second ALHS volume.- Species and subject index.- Advertisement of the 'ALHS of Animals' Volume 1. …

Taschenbuch. Condición: Neu. Neuware - In recent years there has been a growing interest in and concern for the development of a sound spatial statistical body of theory. This work has been undertaken by geographers, statisticians, regional scientists, econometricians, and others (e. g. , sociologists). It has led to the publication of a number of books, including Cliff and Ord's Spatial Processes (1981), Bartlett's The Statistical Analysis of Spatial Pattern (1975), Ripley's Spatial Statistics (1981), Paelinck and Klaassen's Spatial Economet~ics (1979), Ahuja and Schachter's Pattern Models (1983), and Upton and Fingleton's Spatial Data Analysis by Example (1985). The first of these books presents a useful introduction to the topic of spatial autocorrelation, focusing on autocorrelation indices and their sampling distributions. The second of these books is quite brief, but nevertheless furnishes an eloquent introduction to the rela tionship between spatial autoregressive and two-dimensional spectral models. Ripley's book virtually ignores autoregressive and trend surface modelling, and focuses almost solely on point pattern analysis. Paelinck and Klaassen's book closely follows an econometric textbook format, and as a result overlooks much of the important material necessary for successful spatial data analy sis. It almost exclusively addresses distance and gravity models, with some treatment of autoregressive modelling. Pattern Models supplements Cliff and Ord's book, which in combination provide a good introduction to spatial data analysis. Its basic limitation is a preoccupation with the geometry of planar patterns, and hence is very narrow in scope. …

Taschenbuch. Condición: Neu. Neuware - Fundamental unsolved problems of stellar astrophysics include the effects of angular momentum on stellar structure and evolution, the nature and efficiency of the processes by which angular momentum is redistributed within and lost from stars, and the role that stellar rotation plays in enhancing or driving stellar mass loss. There appears to be a qualitative change in the nature and efficiency of these mechanisms near spectral type FO: hotter (more massive) stars typically retain more angular momentum at least until they reach the main sequence, while cooler stars typically spin down quickly. For the hotter stars, recent work suggests a strong link between the type of pulsation behavior, the mass loss rates, and the rotation velocity. If the same mechanisms are able to drive mass loss from the main sequence A stars, as has recently been proposed, then the current interpretations of a number of observations will be drastically affected: e. g. the ages of clusters may be incorrect by up to a factor of two, and the surface abundances of isotopes of He, Li and Be may no longer give constraints on cosmological nucleosynthesis. There are also effects on the evolution of the abundances of elements in the interstellar medium and on the general evolution of populations of stars. Thus the questions of the mechanisms of angular momentum and mass loss of stars more massive than the sun is important not only for stellar studies but for the foundations of much of modern astrophysics.…

Taschenbuch. Condición: Neu. Neuware - This book is divided into Sections. Each Section is devoted to a particular theme in Motor Development and comprises two or more contributions. The order of presentation is largely fortuitous and does not reflect any value judgement on the part of the editors as to the importance of anyone theme in comparison to others addressed' in the book. This volume is to be seen as a companion volume to 'Motor Development in Children: Aspects of coordination and control' in which the more general issues in motor development presented during the Institute are published. Together, the two volumes provide both a general and a theme specific approach to this expanding field of knowledge. XI PREFACE Books and conferences, on what in North America is euphemistically termed motor development, have been few and far between in the past 25 years. This is not to say that the study of how children acquire and develop motor skills has not been a subject on which scientists have focused their attention. In the United States in the 1930's and 1940's, Bayley (1935) and Gesell and Amatruda (1947) described and scaled the rates at which young children acquired motor skills. In Europe, the development of childrens' motor behaviour was of theoretical interest to Piaget (1952).…

Taschenbuch. Condición: Neu. Neuware - Topics for the Beltsville Symposia are selected to highlight specific areas of research and science policy that are of concern to scientists in the Beltsville Area as well as to the general scientific community. Each sympo sium in the series is structured to provide a realistic appraisal of current findings, research progress, and relevant policy issues within the constraints established by the organizing committee. Thus, the presentations and dis cussions that have marked these symposia have had a strong appeal to the broad community of scientists. Knowledge of the diversity of living organisms is still quite limited. Since the time of Linnaeus, about 1.7 million species have been described. The actual number has been estimated between 5-50 million. Many species, land races, and strains are vanishing. Clearly, the world's scientific institutions are inadequately equipped to attain sufficient knowledge of a significant fraction of the diverse living forms. Also, efforts in the collection and preservation of germplasm of plants and animals urgently need to be strengthened. These mattes are critically important to future generations. This symposium addresses vital concerns of biotic diversity and germ plasm preservation from diverse perspectives. Many of the parts provide concrete recommendations for action, and they call attention to areas of research that must be pursued with intensity.…

Taschenbuch. Condición: Neu. Neuware - The need for adequate means by which to improve urine output is very old. Even in the 'Scuola Salernitana', the oldest medieval medical school in Western Europe, about 1000 years ago it was taught how to improve urine output. The list of known 'diuretica' included herbs, plants, roots, vegetables, in particular asparagus, fennel and carrot. The first diuretic drugs, however, were mercurial compounds. Thus, calomel, mercurous chloride, was initially used as a diuretic in the sixteenth century by Paracelsus, being one of the ingredients of the so-called 'Guy's Hospital pill'. But calomel had a cathartic effect so that it was replaced by organic mercurial compounds. These diuretics were clearly toxic. After the discovery of the car bonic anhydrase, in the early 1930s, and the introduction of sulfanilamide as a chemotherapeutic agent, it was observed that this drug was inhibiting carbonic anhydrase in vitro and urinary acidification in vivo thereby causing metabolic acidosis; urine output, however, appeared to increase. Subsequent studies led to the synthesis of more potent analogs, in particular acetazolamide. Studies on car bonic anhydrase inhibitors led to the synthesis of benzothiadiazides which disclosed much less inactivating action on carbonic anhydrase and much more diuretic effect through an inhibition of tubular transport of sodium and chloride. Chlorothiazide was the first member of this class of diuretics. Thiazides are still used in clinical practice. …

Taschenbuch. Condición: Neu. Neuware - On a mountainside in sunny Tuscany, in October 1989, 96 people from 23 countries on five continents gathered to learn and teach about the problems of managing contemporary science. The diversity of economic and political systems represented in the group was matched by our occupations, which stretched from science policy practitioners, through research scientists and engineers, through academic observers of science and science policy. It was this diversity, along with the opportunities for infonnal discussion provided by long meals and remote location, that made the conference a special learning experience. Except at lecture time, it was impossible to distinguish the 'students' at this event from the 'teachers,' and even the most senior members of the teaching staff went away with a sense that they had learned more from this group than from many a standard conference on science policy they had attended. The flavor of the conference experience cannot be captured adequately in a proceedings volume, and so we have not tried to create a historical record in this book. Instead, we have attempted to illustrate the core problems the panicipants at the conference shared, discussed, and debated, using both lectures delivered by the fonnal teaching staff and summaries of panel discussions, which extended to other panicipants and therefore increased the range of experiences reponed.…

Taschenbuch. Condición: Neu. Neuware - Butterflyfishes of the family Chaetodontidae are conspicuous members of almost all tropical reefs. These colorful fishes have attracted a great deal of attention from both the scientific community and especially the aquarium fish industry. At first one is tempted to say that butterflyfishes are abundant worldwide, but the evidence does not support this statement. The biomass of chaetodontids on reefs may range from 0.02-0.80%, and in terms of numbers they comprise only 0.04-0.61 % of the individuals on the reef. Yet in spite of these relatively small numbers they have been extensively studied. A quick census shows some 170 articles on or about butterfly fishes, with 78% of them being published since the 1970's. Along with the cichlids and damselfishes they might be one of the most studied and well published family of tropical fishes. Why then have chaetodontids attracted so much attention The butterflyfishes are mostly shallow water inhabitants that are approachable and easily recognizable, making their study very feasible. Their bright coloration has provoked many hypotheses but has posed more questions about coloration than it has provided answers. And despite their apparent overall morphological similarity, their highly structured and varied social systems have made them an ideal model for such studies. The reasons for choosing these organisms are indeed as diverse as the studies themselves.…

Taschenbuch. Condición: Neu. Neuware - The impact of Helicobacter pylori on basic science and the clinical management of patients with the complications of this infection is bewildering. The explosion of new information both in the laboratory and at the bedside has progressed at an unprecedented rate. Our main objective in furthering this progress has been to integrate this new information and organize a series of top-quality presentations and discussions between investigators and clinicians on all aspects of H. pylori research and to review the current position and future research directions. To that end, the second meeting 'Helicobacter pylori: Basic Mechanisms to Clinical Cure' was organized in June 1996 in Ottawa, Canada, following the successful format of the first such meeting held in Amelia Island, Florida, in 1993. The meeting again focused on all timely aspects of H. pylori research. Internationally renowned basic and clinical scientists, all experts in their respective fields, explored in depth the spectrum of H. pylori infection and the related complications of gastritis, peptic ulcer, gastric cancer and lymphoma.…

Taschenbuch. Condición: Neu. Neuware - Most fluid flows of practical importance are fully three-dimensional, so the non-linear instability properties of three-dimensional flows are of particular interest. In some cases the three-dimensionality may have been caused by a finite amplitude disturbance whilst, more usually, the unperturbed state is three-dimensional. Practical applications where transition is thought to be associated with non-linearity in a three- dimensional flow arise, for example, in aerodynamics (swept wings, engine nacelles, etc.), turbines and aortic blood flow. Here inviscid `cross-flow' disturbances as well as Tollmien-Schlichting and Görtler vortices can all occur simultaneously and their mutual non-linear behaviour must be understood if transition is to be predicted. The non-linear interactions are so complex that usually fully numerical or combined asymptotic/numerical methods must be used. Moreover, in view of the complexity of the instability processes, there is also a growing need for detailed and accurate experimental information. Carefully conducted tests allow us to identify those elements of a particular problem which are dominant. This assists in both the formulation of a relevant theoretical problem and the subsequent physical validation of predictions. It should be noted that the demands made upon the skills of the experimentalist are high and that the tests can be extremely sophisticated - often making use of the latest developments in flow diagnostic techniques, automated high speed data gathering, data analysis, fast processing and presentation.…

Taschenbuch. Condición: Neu. Neuware - About 2. 5 million individuals have congestive heart fai lure in the United States with over 400,000 new cases expected annually. Congestive heart failure also is one of the commonest causes for hospital admissions accounting for over 5 million hospital days per year. Despite the early recognition of this condition and active medical research into both mechanisms and therapy, prognosis continues to remain dismal wi th less than a 50% expected five year survival. In the last decade we have seen many new medical and therapeutic options for patients with congestive heart failure which extend beyond the use of bed rest, sodium restriction, digitalis and diuretics. These include vasodilators of a variety of types including the angiotensin conventional enzyme (ACE) inhibitors. Also, many new inotropes are under active investigation both in oral and intravenous forms. In March of 1984 a survey of over 5000 physicians was performed under the auspices of the American Heart Association (reported in: JAOC 8:966, 1986). That survey showed that there was no universally accepted defini tion for congestive heart fai lure and that a wide spectrum of diagnostic cri teria for this common condi tion existed even among academic cardiologists. There was no clear standard as to even the mos t bas ic treatment of conges t i ve heart fai lure. For example, exercise restriction was recommended by 19% of physicians, 31% recommended no change in activity, and 50% either light exercise or an exercise conditioning program.…

Taschenbuch. Condición: Neu. Neuware - Colour Vision Deficiences VIII brings together information on the latest trends in the following areas of research: -Visual effects of intense lights; -Effects of intoxications on colour vision; -Ageing and vision; -Methods of examination; -Congenital defects; -Acquired defects; -Practical aspects; -Physiological bases. This volume is a natural follow-up on Volumes VI and VII published in 1981 and 1983 respectively by Dr. W. Junk Publishers. …