Resultados de Pesquisa

INGLÊS

Plasmids Of Eukaryotes - Fundamentals And Applications

de Christine Lang-Hinrichs, Heinz D. Osiewacz, Karl Esser, Paul Lemke, Paul Tudzynski, Ulf Stahl e Ulrich Kuck

118,59€ + 10% EM CARTÃO

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 This review will not consider plasmids of prokaryotic origin, even though certain bacterial plasmids, such as the tumor-inducing (Ti) plasmids of Agrobacterium tumefaciens, may be intimately associated with transformation of the eukaryotic host.
INGLÊS

Introduction To Molecular Embryology

de Henri Alexandre e Jean Brachet

59,61€ + 10% EM CARTÃO

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 Nearly 10 years have elapsed since I finished writing the first edition of Intro duction to Molecular Embryology. During this period, molecular embryology has made great strides forward, but without undergoing a major revolution; there fore, the general philosophy and outline of the book have remained almost un changed. However, all the chapters had to be almost completely rewritten in or der to introduce new facts and to eliminate findings which have lost interest or have been disproved. There was a major gap in the first edition of this book: very little was said about mammalian eggs despite their obvious interest for mankind. Research on mammalian eggs and embryos is so active today that this important topic deserves a full chapter in a book concerned with molecular embryology. Therefore, I am very thankful to my colleague Dr. Henri Alexandre, who has written a chapter on mammalian embryology (Chap. 9) and has prepared all the illustrations for this book.
INGLÊS

On The Texture Of Brains - An Introduction To Neuroanatomy For The Cybernetically Minded

de Valentin Braitenberg

59,61€ + 10% EM CARTÃO

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 I believe that the most intriguing thing in the world, be sides the world itself, is the human brain. Moreover, I am sure that a coherent natural philosophy will only be possible once we have understood how the brain, itself an object of physics, generates the description of the physical word. Therefore a book on the brain, be it the fly''s or the mouse''s brain, needs no justification. It is important, however, to point out the limits of its ambi tions. The first three Chapters are introductory and are written in a lighthearted philosophical vein. An idea is introduced that turns up repeatedly in the rest of the book, namely, that the structure of brains is information about the world. Chapter 4 is didactic: in it the neuron and its function are sketched as the element of the nerv ous tissue. Chapters 5 to 8 are a collection of essays loosely tied together mainly by the vagaries of my own interests. They do not intend to be definitive statements about the cerebellum, the cerebral cortex, or the visual ganglia of insects but rather illuminate these structures from a personal point of view. Accordingly, many au thors will find their own contributions only insufficiently represented in the text and frequently without explicit quotation. I beg their pardon and remind the reader that enough competent reviews are available in the fields that I touch upon, easily accessible through the references.
INGLÊS

Vegetation Of The Earth And Ecological Systems Of The Geo-Biosphere

de Heinrich Walter

95,40€ + 10% EM CARTÃO

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 We shall limit our observations to the conditions in natural ecosystems, since it would be beyond the scope of this book to embark upon a consideration of secondary, man-made ecosystems. 2. Classification of the Geo-biosphere into Zonobiomes The biosphere is the thin layer of the earth''s surface to which the phenomena connected with living matter are confined. On land, this comprises the lowest layer of the atmosphere permanently inhabited by living organisms and into which plants extend, as well as the root-containing portion of the lithosphere, which we term the soil. Living organisms are also found in all bodies of water, to the very depths of the oceans. In a watery medium, however, cycling of material is achieved by means other than those on land, and the organisms (plankton) are so different that aquatic ecosystems have to be dealt with separately. The biosphere is therefore subdivided into (a) the geo-biosphere comprising terrestrial ecosystems, and (b) the hydro-biosphere, comprising aquatic ecosystems, which is the field of hydrobiologists (oceanographers and limnologists) . Our studies are confined to the geo-biosphere (Walter 1976), which constitutes the habitat of man and is, therefore, of special interest. The prevailing climate, being the primary independent factor in the environment, can be used as a basis for further subdivision of the geo-biosphere since the formation of soil and type of vegetation are dependent upon it (see p. 3), and it has not yet been substantially influenced by man.
INGLÊS

New Cosmos

de Albrecht Unsold e Bodo Baschek

95,40€ + 10% EM CARTÃO

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 Astronomy, astrophysics and space research have developed extensively and rapidly in the last few decades. The new opportunities for observation afforded by space travel, the development of high-sensitivity light detectors and the use of powerful computers have revealed new aspects of the fascinating world of galaxies and quasars, stars and planets. The fourth, completely revised edition of The New Cosmos bears witness to this explosive development. It provides a comprehensive but concise introduction to all of astronomy and astrophysics. It stresses observations and theoretical principles equally, requiring of the reader only basic mathematical and scientific background knowledge. Like its predecessors, this edition of The New Cosmos will be welcomed by students and researchers in the fields of astronomy, physics and earth sciences, as well as by serious amateur astronomers.
INGLÊS

Physiological Clock - Endogenous Diurnal Rhythms And Biological Chronometry

de Erwin Bunning

95,40€ + 10% EM CARTÃO

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 This book is a translation of the second Gennan edition (1963). In a few places modifications have been made to take into account important works that have since appeared. The aim has not been an all-embracing survey of experimental facts on the subject, but rather to emphasize the physiological kinship of phenomena having a wide variety of names, and to show thereby the great extent to which the physio logical clock influences quite different phenomena in the "behaviour" of uni cellular organisms, of higher plants, of animals, and of human beings. Furthennore, an attempt has been made to make as thorough an analysis of the mechanism of the clock as is possible at the present time. The first draft of the translation was made by Dr. LARS LORCHER (now of the of Radiation and Organisms, Smithsonian Institution, Washington, D. C.). Division The whole script was then thoroughly revised and corrected by Prof. Dr. FRANK SALISBURY (Department of Botany, Colorado State University, Fort Collins, Colorado). Finally, I made amendments and additions to the presentation, as they seemed to me to be necessary, in order to keep abreast of recent developments. Mr. DEREK MCCULLOCH (at present Lecturer in English Language in the Uni versity of Tiibingen) then checked the manuscript. I should like to thank all those involved in the translation for their efforts.
INGLÊS

Physics In My Generation

de Max Born

59,61€ + 10% EM CARTÃO

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 THE idea of collecting these essays occurred to me when, in the leisure of retire- ment, I scanned some of my own books and found that two of the more widely read show a startling change of attitude to some of the fundamental concepts of science.
INGLÊS

Facing Reality - Philosophical Adventures By A Brain Scientist

de J. C. Eccles

59,61€ + 10% EM CARTÃO

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 The titling of this book - "Facing Reality" - came to me unbidden, presumably from my subconscious! But, when it came, it seemed to be right, because that essentially is what I am trying to do in this book. " Facing" is to be understood in the sense of "looking at in a steadfast and unflinching manner". It thus contrasts with "Confronting" which has the sense of "looking at with hostility and defiance". As I face life with its joys and its sorrows, its successes and its failures, its peace and its turmoil, my attitude is one of serene acceptance and gratitude and not one of angry and arrogant confrontation and rejection. The other component of the title - "Reality" - is the ultimate reality for each of us as conscious beings - our birth - our self-hood in its long stream of becoming throughout our life - our death and apparent annihilation. This is the Reality that we each of us must face if we are to live and adventure as free and responsible beings and not as mere playthings of chance and circumstance, going through a mean- ingless farce from birth to death with the search ever for distraction and self-forgetfulness. As a brain scientist I have specialist knowledge of that wonderful part of the body that is alone concerned in the whole Iife-Iong interplay between the conscious self and the extern al world, including other selves.
INGLÊS

Introduction To Environmental Biophysics

de Gaylon S. Campbell

95,40€ + 10% EM CARTÃO

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 The study of environmental biophysics probably began earlier in man''s history than that of any other science. The study of organism-environment interaction provided a key to survival and progress. Systematic study of the science and recording of experimental results goes back many hundreds of years. Ben jamin Franklin, the early American statesman, inventor, printer, and scientist studied conduction, evaporation, and radiation. One of his observations is as follows: My desk on which I now write, and the lock of my desk, are both exposed to the same temperature of the air, and have therefore the same degree of heat or cold; yet if I lay my hand successively on the wood and on the metal, the latter feels much the coldest, not that it is really so, but being a better conductor, it more readily than the wood takes away and draws into itself the fire that was in my skin. 1 Franklin probably was not the first to discover this principle, and certainly was not the last. Modem researchers rediscover this principle frequently in their own work. It is sometimes surprising how slowly progress is made. Progress in environmental biophysics, since the observa tions of Franklin and others, has been mainly in two areas: use of mathematical models to quantify rates of heat and mass transfer and use of the continuity equation that has led to energy budget analyses.
INGLÊS

Computers, Chess And Long-Range Planning

de Michail M. Botvinnik

59,61€ + 10% EM CARTÃO

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 Mihail Moiseevich Botvinnik is an electrical engineer by profession; during World War II he headed a high-tension laboratory in the Urals and was decorated by the USSR for his accomplishments. At present, he is the head of the alternating-current machine laboratory at the Moscow Institute of Power Engineering. He is also a world-renowned chess player. He was born in 1911, and by 1935 had become a Grandmaster of Soviet chess. In 1948 he won the world chess championship and held the title until 1963 (except for a two-year break). His chess style has been characterized as deep, objective, serious, and courageous. In this book, the quality of his thinking is revealed in his study of the basic thought processes of master chess players, and his reduction of these processes to mathematical form. This formalization of thought processes is a contribution to science at three levels: at the immediate level, it provides a basis for a computer program that seems likely to succeed in playing chess; at the middle level, game-playing programs help us to study and rationalize the processes of planning and decision-making; and, at the highest level, the study of the mind in action, as in the game of chess, leads to an understanding of human thought and of the human psyche.
INGLÊS

Genetic Counseling

de Friedrich Vogel e Walter Fuhrmann

95,40€ + 10% EM CARTÃO

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 viii From discussions with our colleagues, we know that they recognize the problems and worry about them, but simply do not have the time to thoroughly study the highly specialized genetic literature available. This book is an attempt to fill this void. We have made an effort to keep it as short and clear as possible and to limit it to the important and most frequent genetic abnor malities. In particular, we have tried to take into consid eration the difficulties of the average student in under standing genetic logic and to eliminate the most common errors. This guide is not designed to provide more than basic information. No reader will arise from the study of this volume as an expert genetic counselor. That requires, in this as in all other sciences, knowledge of the highly spe cialized literature as well as extensive experience. Some geneticists therefore take the position that the general practitioner (or specialist in any other field of medicine) cannot possibly give proper genetic counsel to his patients. Because he is not a genetics expert, he should, without exception, refer all such cases to the geneticist. This point of view would condemn this guide as potentially more harmful than helpful in that it might increase the cases of well-meaning error as well as encouraging those who are not competent in this field to deal with problems which are beyond their capacity. We, obviously, do not share this pessimistic standpoint.
INGLÊS

Physics In My Generation

de Max Born

95,40€ + 10% EM CARTÃO

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 Professor Born, one of the most distinguished physicists of our time, has selected some of his most popular writings covering a period of thirty years, framed between his introduction to Einstein's Theory of Relativity (1921) and the postscript to the American edition of The Restless Universe (1951). It includes several discussions of Einstein's work, a short autobiography and articles dealing with the philosophical background of physics and its revolutionary changes during Professor Born's lifetime. Each treatment of a problem illuminates it from a different angle - all of them from a personal point of view.
INGLÊS

Concepts Of Applied Ecology

de R. S. Desanto

59,61€ + 10% EM CARTÃO

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 This book represents the interests and attitudes, the information, and the philosophy that define my work and career as it has evolved over the years.
INGLÊS

Dealing With Dilemma - A Manual For Genetic Counselors

de P. T. Kelly

59,61€ + 10% EM CARTÃO

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 The aim of DEALING WITH DILEMMA is to inte- grate medical and genetic information with the psychoso- cial aspects of genetic counseling, in order to provide a working manual for genetic counselors.
INGLÊS

Elements Of Optimization - With Applications In Economics And Business

de Delia Koo

59,61€ + 10% EM CARTÃO

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 This book attempts to present the concepts which underlie the various optimization procedures which are commonly used. It is written primarily for those scientists such as economists, operations researchers, and en gineers whose main tools of analysis involve optimization techniques and who possess a (not very sharp) knowledge of one or one-and-a-half year''s calculus through partial differentiation and Taylor''s theorem and some acquaintance with elementary vector and matrix terminology. Such a scientist is frequently confronted with expressions such as Lagrange multi pliers, first-and second-order conditions, linear programming and activity analysis, duality, the Kuhn-Tucker conditions, and, more recently, dy namic programming and optimal control. He or she uses or needs to use these optimization techniques, and would like to feel more comfortable with them through better understanding of their underlying mathematical concepts, but has no immediate use for a formal theorem-proof treatment which quickly abstracts to a general case of n variables and uses a style and terminology that are discouraging to people who are not mathematics majors. The emphasis of this book is on clarity and plausibility. Through examples which are worked out step by step in detail, I hope to illustrate some tools which will be useful to scientists when they apply optimization techniques to their problems. Most of the chapters may be read independently of each other-with the exception of Chapter 6, which depends on Chapter 5. For instance, the reader will find little or no difficulty in reading Chapter 8 without having read the previous chapters.
INGLÊS

Valency

de J.E. Kent, M.F. O'Dwyer e R.D. Brown

59,61€ + 10% EM CARTÃO

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 , energy levels of electrons in atoms, energetic considerations of bonding in diatomic molecules, and packing of ions in the simplest solid state structures- we believe form a good basis for students to progress to more complicated systems in a qualitative way.
INGLÊS

Human And Mammalian Cytogenetics - An Historical Perspective

de T. C. Hsu

118,59€ + 10% EM CARTÃO

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 The history of science is mostly written retrospec- tively, a generation or two after the actual events being discussed.
INGLÊS

Human Biosociology - From Cell To Culture

de P.B. Porterfield e W.W. Spradlin

59,61€ + 10% EM CARTÃO

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 There is growing evidence that an amalgamation of systems theories and communication and information theories will become the leading conceptual model for addressing human behavior.
INGLÊS

Simple Non-Euclidean Geometry And Its Physical Basis - An Elementary Account Of Galilean Geometry And The Galilean Principle Of Relativity

de I.M. Yaglom

92,74€ + 10% EM CARTÃO

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 This geometry, also called hyperbolic geometry, is part of the required subject matter of many mathematics departments in universities and teachers' colleges-a reflec- tion of the view that familiarity with the elements of hyperbolic geometry is a useful part of the background of future high school teachers.
INGLÊS

Introduction To Macromolecules

de L. Mandelkern

59,61€ + 10% EM CARTÃO

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 The reception of the original volume by students, pedagogues, and reviewers has been most gratifying. It appears to have both satisfied a need and served a useful educational purpose. Hence, some ten years later it has been deemed advisable to bring it up to date, if only in a slightly expanded form. The purpose for writing this book and its level remain the same. Many new polymers have been synthesized in the last decade that have found meaningful and novel uses. Examples of these applications are included in this new edition. Major advances have also been made in biophysics and in molecular biology, as well as in our understanding of natural processes on a molecular level. Foremost among these has been the development of recombinant DNA technology. With it has come the potential for large scale synthesis of hormones and proteins. These new developments have also been incorporated into the present volume. It is my hope that this new edition will still have a widespread appeal to students in all of the natural sciences whatever their major interest. It should also be of use and inter est to those starting industrial or academic careers who have not had an extensive background in macromolecular science.
INGLÊS

Genetic Counseling - A Guide For The Practicing Physician

de Friedrich Vogel e Walter Fuhrmann

7,94€ + 10% EM CARTÃO

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 "An ounce of prevention is worth a pound of cure" In medicine the truth of this statement is so self-evident that it is simply taken for granted; and yet it has become mere lip-service for many a doctor, since his work is almost exclusively concerned with the treatment of those who are already ill. This applies not only to the treatment of patients but even more to that of entire families. Many doctors are as yet unaware that the appearance of serious, sometimes fatal diseases can be avoided by preventing the concep tion of sick human beings. Our knowledge of genetics permits the relatively accurate prediction, based on statistical probability, of the recurrence of genetic defects (anomalies) and diseases within families. Our patients are frequently aware that such predictions are pos sible. In an effort to prevent the birth of defective children they try to inform themselves. However, in the practice of the individual doctor this sort of inquiry does not occur with such frequency that he is forced to concern himself systematically with these problems.
INGLÊS

New Cosmos

de A. Unsold e B. Baschek

95,40€ + 10% EM CARTÃO

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 to the Second Edition The development of astronomy in the last ten years has been nothing short of explosive. This second edition of The New Cosmos, considerably revised and enlarged, tries to share this development with its readers. Let us mention a few key words: from mo on landings, planetary probes, aild continental drift through pulsars, X-ray and y-ray sources, interstellar molecules, quasars, and the structure and evolution of stars and stellar systems right up to cosmological models. As before, the most important task of this book is to give a not too difficult introduction to present-day astronomy and astrophysics, both to the student of astronomy and to the specialist from a neighboring discipline. We therefore draw to the attention of the reader, as an essential part of our description, the numerous illustrations-many of them new-and their detailed captions. As far as possible we link a description of important observations with basic features of the theory. On the other hand, when it comes to detail we often content ourselves with abrief description, leaving the detailed explanation to the specialist literature. The transition to the specialist literature should be eased by the Bibliography at the end of the book. Important new investigations are noted in the text by their year, not so much for historical reasons as to enable the original work to be found in the Astronomy and Astrophysics Abstracts (1969 on).
INGLÊS

New Cosmos.

de A. Unsold

95,40€ + 10% EM CARTÃO

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 This book may serve to present the modern view of the universe to a large number of readers whose over-full professional commit ments leave them no time for the study of larger monographs ... Such a book should not be too compendious. Accordingly, the author has been at pains to allow the leading ideas of the various domains of astronomical investigation to stand out plainly in their scientific and historical settings; the introductory chapters of the three parts of the book ... , in the framework of historical surveys, should assist the general review. With that in mind, the title was chosen following Alexander von Humboldt''s well known book "Kosmos, Entwurf einer physischen Weltbeschreibung" (1827-1859). On the other hand, particular results - which admittedly first lend colour to the picture - are often simply stated without attempting any thorough justification. The reader seeking further information will find guidance in the Bibliography. This makes no pretentions to completeness or historical balance. References in the text or in captions for the figures, by quoting authors and years, make it possible for the reader to trace the relevant publications through the standard abstracting journals. I wish to thank my colleagues V. WEIDEMANN, E. RICHTER and B. BASCHEK for their critical reading of the book and for much helpful counsel, and H. HOLWEGER for his tireless collaboration with the proofs. Similarly, my thanks are due to Miss ANTJE WAGNER for the careful preparation of the typescript.
INGLÊS

Molecular Radiation Biology - The Action Of Ionizing Radiation On Elementary Biological Objects

de Hermann Dertinger e Horst Jung

59,61€ + 10% EM CARTÃO

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 There can hardly be any doubt that radiation will continue to be an im portant factor in our lives. Present and future advances in atomic tech nology urgently require further work on research and development in the field of radiation biology if the maximum benefit is to be obtained at minimal risk from the various kinds of radiation that form a major by product of nuclear processes. Consequently, it is also necessary to prepare students and younger scientists for doing such work. The present book originates from teaching experience gained in lectures, seminars, and discussion groups started by the undersigned in 1957 and more recently held together with Drs. Dertinger and Jung. The friendly comments given to the German edition made us feel that it might be worth while to put the results of our efforts at the disposal of those to whom English is more familiar. In agreement with the view, based on well-known facts, that most if not aIl of the more striking practical achievements have resulted from patient and careful investigations into some basic problem, the book aims at introducing the reader to the methods of thought and experiment used in molecular radiation biology as weIl as to the results obtained thereby.
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