Hans R. Kricheldorf – författare

An in-depth review of important preparative methods for the synthesis and chemical modification of polymers, this authoritative second edition examines the advantages and limitations of various polymerization applications and procedures. It features new approaches and innovative strategies from the most prominent industry and academic laboratories, reflecting the burgeoning role of polymers in modern science and technology. The book analyzes biodegradable polymers for biomedical applications; investigates the use of polyolefins, polymeric dienes, aromatic polyethers, polymides, and metal-containing macromolecules; and covers polymers of acrylic acid, methacrylic acid, and maleic acid.

This book advocates the importance and value of errors for the progress of scientific research! It compares natural sciences with other scientific disciplines, such as historical research or sociology, and examines the question if scientific research can generate knowledge of permanent validity.

This book advocates the importance and value of errors for the progress of scientific research! It compares natural sciences with other scientific disciplines, such as historical research or sociology, and examines the question if scientific research can generate knowledge of permanent validity.

In 1906, Hermann Leuchs, a student of Emil Fischer, discovered the class of N-Carboxy-aminoacid-anhydrides, also known as Leuch's anhydrides, or abbreviated NCAs. These compounds are, even 80 years after their discovery, valuable intermediates in organic synthesis due to their reactivity: NCAs polymerize with the elimination of carbondioxide to yield polypeptides, model compounds for proteins. They can be used as starting material for a variety of pharmaceutically interesting products and for synthetic polymers (fibres and films). Ralph Hirschmann demonstrated the step by step synthesis of ribonuclease utilizing NCAs as monomers. The author of this monograph, Hans R. Kricheldorf, University Hamburg, is, on account of his own research in Freiburg and Hamburg, predestined to give the reader an insight into the organic chemistry of NCAs and related heterocycles as well as macromolecular chemistry, that is the synthesis of polypeptides and the structure-reactivity relationship. I predict a good accept- ance of this book about the class of cyclic aminoacid derivatives by scientists in various areas.Aachen, September 1986 Helmut Zahn Acknowledgment The author would like to express his gratitude to the american chemical society, the royal society of chemistry, Marcel Dekker Inc., John Wiley & Sons, Hiithig & Wepf Verlag and Kobunshi Gakkai for the permission to reproduce figures from their journals.

Wer neue Ideen hat, stößt oftmals erst auf Ablehnung. Das ist in den Naturwissenschaften und in der Medizin nicht anders als im alltäglichen Leben.​ Wie der Autor eindrucksvoll darstellt, haben viele wissenschaftliche Erkenntnisse und heute allgemein anerkannte Theorien mitunter Jahrzehnte oder gar Jahrhunderte benötigt, ehe sie von den Koryphäen der damaligen Zeit endlich akzeptiert wurden. Manche Entdecker wurden gar erst posthum gefeiert, und so manch großer Name erscheint in wenig strahlendem Licht, wenn man seine Irrtümer genauer unter die Lupe nimmt. Und das versteht der Autor vorzüglich, ohne dabei Schadenfreude aufkommen zu lassen. Ein kurzweiliges Lesevergnügen nicht nur für wissenschaftlich oder historisch Interessierte!

In diesem Buch werden experimentelle Ergebnisse zum Konzept der molekularen Evolution geschildert und kritisch bewertet. Dies geschieht erstmals aus der Sicht eines Polymerchemikers.

This book provides an in-depth analysis of the hypothesis of chemical evolution that may have led to the origin of life, serving three main purposes: it provides a comprehensive summary of hundreds of chemical experiments and analytical studies from the past 70 years, evaluates their significance in supporting the hypothesis of chemical evolution, and offers a critical review of these experiments and hypotheses. The book is particularly valuable for students, postdocs, and scientists engaged in experimental work in this field. This book outlines the latest experimental and theoretical achievements in chemical evolution research, addressing fundamental questions such as “How to define life?” and “Why life by chemical evolution?”. It explores various hypotheses and covers topics like polymerization processes, model syntheses of amino acids, saccharides, and nucleotides, and the chemistry of interstellar clouds and meteorites. In this book, readers will discover a thorough examination of the problem of homochirality and its implications for the origin of life. The book also invites readers to think through critical questions such as the likelihood of life emerging elsewhere in the universe and the role of race­mization in early biochemical processes. This volume is an essential resource for researchers and scholars in biochemistry, as­trobiology, and evolutionary biology, as well as students and interested laypersons. Offering valuable insights into the chemical foundations of life, this book appeals to all who are curious about how life began.

Dieses Buch beschäftigt sich mit der Frage, inwieweit das Vorhandensein oder das Fehlen wichtiger Rohstoffe den Lauf der deutschen Geschichte beeinflusst hat. Ferner wird dargelegt, dass Deutschland eine einmalige Rolle in der Weltgeschichte dadurch einnimmt, dass chemische Erfindungen und die Entstehung einer potenten chemischen Industrie einen entscheidenden Einfluss auf das Schicksal des Landes hatten.

This book explores the extent to which the presence—or absence—of important raw materials has influenced the course of German history. It also explains that Germany occupies a unique position in world history because chemical inventions and the rise of a powerful chemical industry had a decisive impact on the country’s destiny.