Author: Publisher:
ISBN:
Category : Protoplasm
Languages : en
Pages : 900
Book Description
Protoplasmatologia: Kern- und Zellteilung. A. The chromosome complement, by B. John and K. R. Lewis. B. The chromosome cycle, by B. John and K. R. Lewis. C. Endomitose und endomitotische Polyploidisierung, von L. Geitler. D. Riesenchromosomen, von W. Beermann. E. Amitose. 1. Die Amitose der tierischen und menschlichen Zelle, von O. Bucher. F1. Meiotic system. F2. Les altérations de la méiose chez les animaux parthenogénétiques, par M. Narbel-Hofstetter. F3. Fortpflanzungsmodus und Meiose apomiktischer Blütenpflanzen, von A. Rutishauser. G. Der Kernteilungsmechanismus. 1. The behavior of centrioles
Author: Protoplasmatologia
Author: Lewis Victor HeilbrunnPublisher:
ISBN:
Category : Protoplasm
Languages : de
Pages : 264
Book Description
Comparative Organellography of the Cytoplasm
Author: Albert Frey-WysslingPublisher: Springer
ISBN: 9783211811399
Category : Science
Languages : en
Pages : 122
Book Description
Since the publication of my monograph "Die submikroskopische Struktur des Cytoplasm as" [Protoplasmatologia III A12 (1955)], science has increased our knowledge on this cell constituent in an amazing way. At that time, cytoplasm was still considered as an amorphous colloid with an amicroscopic structure capable of sol/gel transformations. Meanwhile, within the past 18 years, ultrastructure research and molecular biology have shown that it consists of structured organelles, thereby revolutionizing our concept of the cytoplasm. There is an ontogeny of these organelles which deals with their appearance, development, growth and eventual disappearance. Although the results of relevant studies are less spectacular at this time than those concerning nucleic acids, they will become more and more important in the near future, because they touch the basic question of how molecular morphogenesis is realized. Therefore, an attempt is made to portray the actual state of these problems from a biological point of view which involves a comparison of the established organelles. I thank Miss SONIA TURLER and Dr. ELsA HAUSERMANN for their help with the manuscript and my former pupils and assistants Drs. Kopp, KUHN, SCHWARZENBACH, STAEHELIN, STEINMANN, and VOGEL, as well as my colleagues Professors MATILE, MooR, and MUHLETHALER for original electron micro graphs.
International Review of Cytology
Author: Publisher: Academic Press
ISBN: 0080585914
Category : Science
Languages : en
Pages : 389
Book Description
International Review of Cytology
Catalog of Copyright Entries. Third Series
Author: Library of Congress. Copyright OfficePublisher: Copyright Office, Library of Congress
ISBN:
Category : Copyright
Languages : en
Pages : 972
Book Description
Includes Part 1, Number 1: Books and Pamphlets, Including Serials and Contributions to Periodicals (January - June)
The Meiotic System
Author: Bernard JohnPublisher: Springer Science & Business Media
ISBN: 370915748X
Category : Science
Languages : en
Pages : 340
Book Description
Introduction When the study of heredity and variation first came to be treated as a scientific subject-and this, one must remember, was only just over a hundred years ago-there was an unfortunate separation between the disciplines of cytology and experimental breeding. This separation was based partly on a lack of understanding and partly on a lack of the desire to understand. Even WILLIAM BATESON, the first apostle of mendelism in England, had a blind spot for cytology and for many years dogmatically refused to believe that MENDEL'S determinants were transmitted and distributed by the chromosomes. This separation between cytology and experimental breeding is one which persists, in a measure, even today, simply because there are two quite different, though complementary, techniques available for the study of heredity and variation. On the one hand, one can study directly the structure and behaviour of the actual vehicles which transmit the genetic determinants from one generation to the next. This is the method employed by those who study genetics through a microscope. The alternative method is that used by the experimental breeder who, in default of being able to watch the hereditary factors segregate from each other directly, is obliged to examine the constitution of the germ cells indirectly by sampling, and usually at random, the products of a controlled mating.
The Viscosity of Protoplasm
Author: Lewis V. HeilbrunnPublisher: Springer Science & Business Media
ISBN: 3709154588
Category : Science
Languages : en
Pages : 113
Book Description
Plants, Chemicals and Growth
Author: F.C. StewardPublisher: Elsevier
ISBN: 0323159303
Category : Science
Languages : en
Pages : 247
Book Description
Plants, Chemicals and Growth focuses on chemicals that regulate the growth and development of plants. It explores the problems of growth and growth regulation by looking at the roles of chemical substances, natural and synthetic, which affect the behavior of the cells of flowering plants. It also describes the variety of responses triggered by such chemicals, which include herbicides, those that stimulate the rooting of cuttings or cause leaf or fruit abscission, and those associated with fruit setting and artificial parthenocarpy. Comprised of 10 chapters, this volume begins with an overview of examples of chemical regulators and the biological responses they induce in plants, from tropism and chemotropism to nastic responses; rhythmic phenomena in growth and development; initiation of lateral organs and problems of phyllotaxy; periodicities in growth; and effects on the balance between vegetative growth, flowering, and fruiting. It discusses the totipotency and exogenous regulation of cells, history and modern concepts of plant growth regulators, the ways chemicals induce growth in quiescent cells, and growth-regulating effects in free cell systems. The reader is also introduced to biologically active compounds, such as indolyl and triazine compounds; how plant-regulating substances work; concepts and interpretations of plant growth regulation; and problems and prospects of chemical regulation of plant growth and development. This book will be of interest to teachers, biology students, agriculturalists, and researchers.
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