the beginnings of human life heidelberg science library

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The Beginnings Of Human Life

Author : E. Blechschmidt
ISBN : 9781461263470
Genre : Science
File Size : 74. 20 MB
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Biokinetics And Biodynamics Of Human Differentiation

Author : Erich Blechschmidt, M.D.
ISBN : 9781583944608
Genre : Medical
File Size : 88. 59 MB
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Fifty years ago the field of human embryology was incomplete; prior to that time the anatomy of early human embryos was still unknown, and there was much to be learned about the older stages of human embryonic development. It is now understood that human organs result from step-by-step differentiations of the growing human embryo. Research by renowned embryologist Erich Blechschmidt, MD, showed that differentiations are not only the result of a gene effect, but are also brought about through growth initiated by extragenetic (occurring outside the gene) information. Without this extragenetic information the differentiation would not begin. Dr. Blechschmidt and coauthor Raymond Gasser, PhD, maintain that Haeckel's biogenetic law (ontogeny recapitulates phylogeny) was an erroneous attempt to explain developmental processes. Blechschmidt's human embryological investigations showed that Darwin's principles (mutation and selection) are likely valid for the origin of the species, but that they cannot explain the ontogenesis of the organs. The ontogenesis of each individual cannot be derived from phylogenetic facts. The authors stress that a clear distinction must be made between the vast field of phylogenetics and the much more exact and understandable field of ontogenetics—particularly the process of differentiation—and their goal is to present not only the abstract biokinetic principles of differentiation, but the originality of embryonic human beings as well. Their knowledge of developmental movements leads to their conclusion that differentiation is an undivided biodynamic process that occurs during development and includes the chemical processes as well. Logically organized into two sections (the first covers early metabolic fields and includes chapters on the one-cell human ovum, the early embryo, blood vessels, the nervous system, head region, trunk, and limbs; the second describes metabolic fields in later developmental stages, distinguishing fields of corrosion, densation, contusion, distusion, retention, dilation, liquation, and detraction), Biokinetics and Biodynamics of Human Differentiation warrants reading by thoughtful professionals in a number of fields concerned with embryonic differentiation. A new preface by Dr. Gasser addresses how the book's principles and findings were and are understood in the field of human embryology.

Darwin Then And Now

Author : Richard William Nelson
ISBN : 9780595618712
Genre : Biography & Autobiography
File Size : 57. 67 MB
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Darwin, Then and Now is a journey through the most amazing story in the history of science; encapsulating who Darwin was, what he said and what scientists have discovered since the publication of The Origin of Species in 1859. While recognized as one of the most influential individuals of the twentieth century, little is widely known about his personal life, interests, and motivations. This book explores Darwin’s driving passion using Darwin’s own words from The Origin of Species, Autobiography, Voyage of the Beagle and letters. In retracing the roots of evolution from the Greeks, Darwin, Then and Now journeys through the dynamics of the eighteenth century that lead to the publication of The Origin of Species and the succeeding role of key players in the emerging evolution revolution. Darwin, Then and Now examines Darwin’s theory with more than three-hundred quotations from The Origin of Species, spotlighting what Darwin said concerning the origin of species and natural selection using the American Museum of Natural History Darwin exhibit format. With over one-thousand referenced quotations from scientists and historians, Darwin, Then and Now explores the scientific evidence over the past 150 years from the fossil record, molecular biology, embryology, and modern genetics. Join the blog at to post your comments and questions.

The Human Central Nervous System

Author : R. Nieuwenhuys
ISBN : 9783662023334
Genre : Medical
File Size : 71. 31 MB
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The particularly good reception enjoyed by our "The Human Central Ner vous System, a Synopsis and Atlas" has made a second edition necessary, hardly more than two years after its first appearance: This new edition enabled us to make a number of corrections, but it was judged premature to undertake a thorough updating of the text. However, a major improvement - suggested by some reviewers and many colleagues - is that in this new edition the abbreviations in the figures have been replaced by the full Latin terms. We want to emphasize that the study of this book can facilitate and deepen but never replace the study of the anatomical preparation. Acquaintance and histology of nervous tissue has been taken for with the basic cytology granted. This book is evidently often consulted with the aim of looking up a particular and its topographical relations. This cer structure together with its name is tainly one of the purposes of the book. We are, however, of the opinion that during a systematic study of the figures showing the functional systems in part IV, perusal of the accompanying text will be necessary. As a matter of fact the spatial representations of the fibre systems are no more than a visualization of the most salient features discussed in the text. The pictures are so to speak a snapshot of the current knowledge of a particular functional system within the central nervous system; no less, but no more either.

Monographic Series

Author : Library of Congress
ISBN : UIUC:30112024897594
Genre : Children's literature in series
File Size : 78. 90 MB
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The Sociology Of Radical Commitment

Author : Gary Backhaus
ISBN : 0739119443
Genre : History
File Size : 41. 2 MB
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This is the first volume to present commentaries on the existential sociology of Kurt H. Wolff_including autobiographical, biographical, exegetic, and creative developmental articulation of his radical thought. The theme of the book connects Wolff to the sociological tradition while at the same time explicates his profound departure from the tradition.

Medical And Health Care Books And Serials In Print

Author :
ISBN : CHI:29738654
Genre : Medicine
File Size : 74. 10 MB
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Medical Books And Serials In Print

Author :
ISBN : CHI:23055387
Genre : Medicine
File Size : 36. 99 MB
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Scientia Rivista Di Scienza

Author :
ISBN : SRLF:A0006324768
Genre : Science
File Size : 77. 49 MB
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Issues for 1909- include "Supplément; traductions françaises des articles dont le texte original n'est pas en langue française" (varies slightly).


Author : George Matsumura
ISBN : 0723418837
Genre : Embryology
File Size : 47. 77 MB
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