springer us apr 1988 (20 resultados)

Buch. Condición: Neu. Neuware -A Cross-National Study of Adolescent Self-Image Adolescence is not, as has been previously assumed, a developmental stage that was defined after the industrial revolution. There is substan tial historical evidence to suggest that adolescence and youth, as a stage, was recognized by the ancient Romans, Greeks, and even Egyp tians. The concept survived through the Dark Ages. In Le Grand Pro prietaire, written in 1556, it is stated: 'The third age, which is called adolescence, . . . ends in the twenty-first year . . . and it can go on till thirty or thirty-five. The age is called adolescence because the person is big enough to beget children. In this age the limbs are soft and able to grow and receive strength and vigor from natural heat' (Aries, 1962, p. 21). The span of years devoted to adolescent development varies in different cultures and with different definitions. The term adolescence is no longer equivalent to pubescence. 'Adolescence' is a psycho social-biological stage of development that corresponds to changes in many areas which accompany the transition from childhood to adult hood. The working definition of adolescence we use is the stage of life that starts with puberty and ends at the time when the person has attained a reasonable degree of independence from his parents. Once in high school or its equivalent, the vast majority of teenagers have al ready undergone the biological changes of puberty.Springer Verlag GmbH, Tiergartenstr. 17, 69121 Heidelberg 288 pp. Englisch.

Buch. Condición: Neu. Neuware -Although the origins of parallel computing go back to the last century, it was only in the 1970s that parallel and vector computers became available to the scientific community. The first of these machines-the 64 processor llliac IV and the vector computers built by Texas Instruments, Control Data Corporation, and then CRA Y Research Corporation-had a somewhat limited impact. They were few in number and available mostly to workers in a few government laboratories. By now, however, the trickle has become a flood. There are over 200 large-scale vector computers now installed, not only in government laboratories but also in universities and in an increasing diversity of industries. Moreover, the National Science Foundation's Super computing Centers have made large vector computers widely available to the academic community. In addition, smaller, very cost-effective vector computers are being manufactured by a number of companies. Parallelism in computers has also progressed rapidly. The largest super computers now consist of several vector processors working in parallel. Although the number of processors in such machines is still relatively small (up to 8), it is expected that an increasing number of processors will be added in the near future (to a total of 16 or 32). Moreover, there are a myriad of research projects to build machines with hundreds, thousands, or even more processors. Indeed, several companies are now selling parallel machines, some with as many as hundreds, or even tens of thousands, of processors.Springer Verlag GmbH, Tiergartenstr. 17, 69121 Heidelberg 324 pp. Englisch.

Buch. Condición: Neu. Neuware -Species of aspergilli are common in man's environment and are responsible for a wide spectrum of human and animal disease, ranging in animals from mycotic abortion to aflatoxicosis and in humans from localized colonization of the ear or skin to life-threatening systemic infection of neutropenic patients. In recent times, invasive aspergillosis has become increasingly important as a cause of morbidity and death, initially in patients receiving immunosuppression prior to organ transplantation, and latterly in haematologic patients rendered neutropenic by underlying disease or chemotherapy. In some centres, the condition has been recorded in more than 40% of patients dying with acute leukaemia. Laboratory diagnostic procedures are not always helpful and the diagnosis depends largely on clinical parameters. The clinician is faced with yet another problem, that of management. At present, antifungal therapy of invasive aspergillosis can be largely ineffectual, and the mortality rate remains unacceptably high. Since Aspergillus fumigatus was first described almost 125 years ago, several other pathogenic species have been recognized. The marked biosynthetic abilities and varied mechanisms of gene recombination of aspergilli have long commanded attention in food technology and genetics. Their equally varied abilities to cause disease have attracted the interest of toxicologists, allergists and physicians concerned with infectious diseases.Springer Verlag GmbH, Tiergartenstr. 17, 69121 Heidelberg 332 pp. Englisch.

Buch. Condición: Neu. Neuware - Prostaglandins, Leukotrienes, and Cancer is a multi-volume series that will focus on an emerging area of cancer research. In 1968, R.H. Williams first reported that elevated prostaglandin levels are present in human medullary car cinoma. Since that time, the concept that arachidonic acid metabolites may be in volved in cancer has expanded to include every aspect of the disease from cell transformation through metastasis. Prostaglandins and leukotrienes are generic terms used to describe a family of bioactive lipids produced from unsaturated fatty acids (principally from arachidonic acid) via the cyclooxygenase and lipoxygenase pathways, respec tively. Cyclooxygenase products consist of diverse products such as prosta glandin Ez (PGEz), prostacyclin (PGIz) and thromboxane Az (TXAz), whereas lipoxygenase products consist of hydroperoxy fatty acids and mono-, di- and tri-hydroxy acids including leukotrienes. The precursor fatty acids for the cyclooxygenase and lipoxygenase pathways are present in cellular phospholipids. This finding established an important control point in their biosynthesis-the release of substrate. This occurs in response to numerous stimuli that act at the cell surface. Dr. Bengt Samuelsson's extensive study of the metabolism of pros taglandins indicated that they are rapidly inactivated on a single pass through pulmonary circulation. Thus, they cannot act as circulating hormones and appear to be made on demand in or in the vicinity of target tissues leading to the concept that prostaglandins are local hormones or autocoids.

Buch. Condición: Neu. Neuware - Field work, supplemented by laboratory studies, is a cornerstone for the geological sciences. This volume provides an introduction to general field work through selected topics that illustrate specific techniques and methodologies. One hundred and twenty-three main entries prepared by leading authorities from around the world deal with aspects of exploration surveys, geotechnical engineering, environmental management. field techniques, mapping, prospecting, and mining.Special efforts were made to include topics that consider aspects of environmental geology in particular those subjects that involve field inspections related to, for example, the placement of artificial fills, sediment control in canals and waterways, the geologic effects of cities, or the importance of expansive soils to environmental management and engineering. In addition, some widely ranging topics dealing with legal affairs, geological methodology, the scope and organization of geology, report writing, and other concepts, such as those related to plate tectonics and continental drift, provide a necessary perspective to the arena of field geology.

Taschenbuch. Condición: Neu. This item is printed on demand - Print on Demand Titel. Neuware -Language and Learning in the Cooperative Classroom reports the results of an experiment on the effects of cooperative learning. The authors address the following questions in detail: Is the effect of cooperative learning on achievement more salient for pupils from the majority or minority ethnic groups Do pupils who study with the Group-Investigation method display more extensive verbal interaction with their peers than pupils who study with the Whole-Class method Is the pupil's verbal interaction in groups related to his/her academic achievement The findings are discussed in terms of their relevance for classroom instruction, for different theories of language behavior and language research, and for issues regarding ethnic relations in multi-ethnic classrooms.Springer Verlag GmbH, Tiergartenstr. 17, 69121 Heidelberg 196 pp. Englisch.

Buch. Condición: Neu. This item is printed on demand - Print on Demand Titel. Neuware -The study of artificial intelligence (AI) is indeed a strange pursuit. Unlike most other disciplines, few AI researchers even agree on a mutually acceptable definition of their chosen field of study. Some see AI as a sub field of computer science, others see AI as a computationally oriented branch of psychology or linguistics, while still others see it as a bag of tricks to be applied to an entire spectrum of diverse domains. This lack of unified purpose among the AI community makes this a very exciting time for AI research: new and diverse projects are springing up literally every day. As one might imagine, however, this diversity also leads to genuine difficulties in assessing the significance and validity of AI research. These difficulties are an indication that AI has not yet matured as a science: it is still at the point where people are attempting to lay down (hopefully sound) foundations. Ritchie and Hanna [1] posit the following categorization as an aid in assessing the validity of an AI research endeavor: (1) The project could introduce, in outline, a novel (or partly novel) idea or set of ideas. (2) The project could elaborate the details of some approach. Starting with the kind of idea in (1), the research could criticize it or fill in further details (3) The project could be an AI experiment, where a theory as in (1) and (2) is applied to some domain. Such experiments are usually computer programs that implement a particular theory.Springer Verlag GmbH, Tiergartenstr. 17, 69121 Heidelberg 256 pp. Englisch.

Buch. Condición: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Developments in the field of instrumentation of innovative instrumentation. Although laser applications have permeated nearly every aspect are among the major contributions to human advancement. The history of surgery has seen of surgical therapy, the expectations have fre many revolutionary developments cause quantum quently been unrealistic and the evaluation of leaps in progress. Electrocautery, the anesthesia technological development has always been machine, computed axial tomography, and the painfully slow. The properties of vaporization, surgical microscope are all revolutionary in coagulation, and cutting unified in an invisible struments that have irrevocably changed the shaft of light have enabled the neurosurgeon to direction of neurological surgery. vaporize inaccessible tumors of brain and spinal In the early stages of application, there are cord, harness recalcitrant bleeding sites, and cut always detractors and valid controversy concern through the most formidable calcified tumors. ing the value of a new instrument. Some will The application of this new energy form in remember those who argued that the magnifica tandem with the surgical microscope has, in my tion and illumination provided by the micro opinion, extended the scope of all aspects of scope were not valuable to the skilled surgeon neurosurgery. We have much more work to do. and would prolong the operative time and in lt is necessary to document improved results and crease infection rates. Others may recall that demand technological advances and safe inno Cushing was told to abandon the blood pressure vations. 182 pp. Englisch.

Buch. Condición: Neu. This item is printed on demand - Print on Demand Titel. Neuware -The field of catheter ablation has grown In a rather helter-skelter fashion. Ablative techniques were applied in patients before basic bioelectric and cellular electrophysiologic effects were fully defined. Since the introduction of this technique into clinical medicine in 1982, happily, a wealth of basic information has become available, and it was thought prudent to summarize existing data in the form of a text. The purpose of this text is to provide for a concise summary of both the basic and clinical experiences to date. It was simply not possible to include chapters from many workers who have made outstanding contributions in this area. For this, I offer my profound apolo gies. I do wish, however, to acknowledge the outstanding work of Drs. Bharati and Lev who provided us with a sound understanding of the histolo gic effects of various energy delivery systems. Their seminal observations allowed us to bring this technique to clinical fruition.Springer Verlag GmbH, Tiergartenstr. 17, 69121 Heidelberg 226 pp. Englisch.

Buch. Condición: Neu. This item is printed on demand - Print on Demand Titel. Neuware -This volume and future ones in the series, which is now under new editorship. depart from the pattern established by previous volumes in containing chapters loosely related to one another. It is thus appropriate that each volume should have a relevant subtitle. In the present volume the underlying theme is immu nology and its application to the study of a number of different biochemical systems. Almost inevitably, the study of the cell-surface antigens and glycoproteins of a number of different tissues tends to dominate the contents, but considerable emphasis is also placed on subcellular organelles and enzymes. Undoubtedly, it is the impact of readily available monoclonal antibodies that dominates work in the field. The epitope specificity provided by monoclonal antibodies gives the biochemist a powerful lever with which to probe the location, structure, and function of cellular protein and glycoprotein antigens. A number of the chapters included in this volume have a strong biomedical emphasis. This is indeed intentional, as it is now the policy of the series to cover the more applied aspects ofthe subject, while in no way neglecting more fundamentaltopics in subcellular biochemistry.Springer Verlag GmbH, Tiergartenstr. 17, 69121 Heidelberg 404 pp. Englisch.

Buch. Condición: Neu. This item is printed on demand - Print on Demand Titel. Neuware -Conjugated polymers suoh as polyaoetylene (CH)x polyphenylene (C6H4)x' poly thiophene (C4H2S)x' etc. , which are insulators in their pristine state, can be brought to the metallic state after 'doping' with ohemioal speoies whioh oan be either eleotron donors or I aoceptors. . This doping prooess involves a oharge transfer between the dopant moleoule and the polymer ohain whioh are then supposed to be spatially olose to each other. It follows that the meohanism of doping must be oonsidered as an aotual interoalation process, which will greatly affeot the struotural oharacteristios of the starting material, as well as its morphology, as has been observed during the 2 intercalation of graphite and layered compounds . In parallel with these modifioations, the band struoture of the system changes yielding a new set of eleotronio properties. It is evident therefore that the struotural and eleotronio properties are intimately related, and must be studied simultaneously in the same system to give reliable information. A great number of studies have been devoted to the structural and electronic properties of conjugated polymers after a chemical or 2 electrochemical doping process . Most of these concern the properties of the system for a given dopant concentration. With this approach a universal pioture of the polymer/dopant system is very diffioult to obtain, as a comparison between different experiments is very hazardous. On the other hand, only a small number of measurements have been performed during the continuous electroohemioal doping of various polymers.Springer Verlag GmbH, Tiergartenstr. 17, 69121 Heidelberg 540 pp. Englisch.

Buch. Condición: Neu. This item is printed on demand - Print on Demand Titel. Neuware -Some 25 years ago, the coronary care unit concentrated high technology and the acutely ill patients who might benefit from it in a single, recognizable space. Since then, that space and its technical equipment have changed, as has part of its population. Acute ischemia, silent and manifest, occurs within and outside of the coronary care unit as pain, arrhythmia, or pump failure. Its detection and treatment require the utilization of many diagnostic techniques and skills, not the least of which is two-dimensional Doppler echocardio graphy, which is gaining importance. Future developments, in tandem with computer technology, may add to this importance by enabling tissue identification, spatial representation, and Doppler flow mapping. This book describes the state of the art for the practicing clinician using Doppler echocardi graphy at the bedside of patients with acute ischemic manifestations of coronary heart disease. The first requirement is to move from the echo laboratory to the coronary care unit, emergency department, operating room, or catheterization laboratory, using equipment suited for that purpose. The second, more trying imperative is to secure good cooper Ition between those treating the acutely ill patient and the investigator who interferes with his probes. If successful ceeding in both, rewarding results can be obtained, since echocardiography is a very sensitive and specific tool for recognizing and quantifying early ischemia. 288 pp. Englisch.