Band Vi Kern Und Zellteilung A The Chromosome Complement B John K R Lewis
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The Chromosome Complement
Author | : Bernard John |
Publisher | : Springer Science & Business Media |
Total Pages | : 211 |
Release | : 2012-12-06 |
Genre | : Science |
ISBN | : 3709157811 |
material can serve both autocatalytic and heterocatalytic functions. Thus not only is it unique in itB capacity for self-replication but its base sequence determines the specificity of proteins. And enzyme proteins are immediately responsible for the peripheral metabolism which enables the organism to impose its own kind of order on the raw materials it absorbs. The course of development is determined not only by the nature of the genetic material but by its over-all amount and the relative frequency of the different functional units. Differential rates of epigenetic activity matter also. In theory, therefore, differential development within or even between individuals could be determined by the differential replication of the various genetic elements or by their differential activity. And further variation could arise by the differential transmission of these elements between cells. Indeed it would appear that all these possibilities are exploited by living systems. If like is to beget like, however, any genetic change which occurs during development must be undone, or else germinal units preserved from change must be set aside. As far as is known, genetic changes, even those involving only quantity or relative amounts, are reversible to only a very limited extent so that a change once done cannot be undone. Consequently genetic changes during the development of presumptive germ-lines are either non existant or minor and confined to a small class of un aggregated deter minants.
The Chromosome Cycle
Author | : Bernard John |
Publisher | : Springer Science & Business Media |
Total Pages | : 132 |
Release | : 2012-12-06 |
Genre | : Science |
ISBN | : 3709155908 |
neoessity for making it. Yet, clearly, the problem of development is largely one of filling "the vacuum between determinant and character" (DARLINGTON 1951). Nowadays the chromosome theory can be presented in much greater detail and with utter confidence, but its two main features remain the same. However, while the role of the chromosomes in heredity and development has been appreciated for a long time, the manner in which they perform their genetic and epigenetic functions has become amenable to critical investigation only in recent years. There is, therefore, still an unmistakable tendency to think of chromosomes in terms of the discrete threads of cell division and, in keeping with this conception, the chromosome cycle is gen erally considered in relation to the microscopically visible changes in morphology which occur during the mechanically active phases of mitosis and meiosis. Chromosome phenotype, however, changes not only during division but throughout the cell cycle. The changes which occur during interphase are, of course, scarcely revealed in morphological modifications of the restless "resting" nucleus. Consequently they are less obvious and correspondingly less amenable to investigation. This accounts for the concentration on the countable karyotype, with its visible properties of pairing and pycnosity, and the measurable movements of separation and segregation.
Cells and Tissues in Culture Methods, Biology and Physiology
Author | : E. N. Willmer |
Publisher | : Elsevier |
Total Pages | : 843 |
Release | : 2013-10-02 |
Genre | : Science |
ISBN | : 1483277232 |
Cells and Tissues in Culture: Methods, Biology, and Physiology, Volume 3 focuses on the applications of the methods of tissue culture to various fields of investigation, including virology, immunology, and preventive medicine. The selection first offers information on molecular organization of cells and tissues in culture and tissue culture in radiobiology. Topics include cellular organization at the molecular level, fibrogenesis in tissue culture, effect of radiation on the growth of isolated cells, and irradiation of the selected parts of the cell. The publication then considers the effects of invading organisms on cells and tissues in culture and cell, tissue, and organ cultures in virus research. The book elaborates on antibody production in tissue culture and tissue culture in pharmacology. Discussions focus on early attempts at in vitro studies, tissue culture in the study of pharmacologically active agents, and methods of assessment of drug activity. The text also reviews invertebrate tissue and organ culture in cell research; introduction and methods employed in plant tissue culture; and growth, differentiation and organogenesis in plant tissue and organ cultures. The selection is a vital source of data for readers interested in the culture of cells and tissues.
The Principles of Clinical Cytogenetics
Author | : Steven Gersen |
Publisher | : Humana Press |
Total Pages | : 0 |
Release | : 2010-10-12 |
Genre | : Medical |
ISBN | : 9781617370700 |
This book provides a comprehensive, in-depth explanation of the basic concepts and interpretations involved in chromosome analysis, a critical technique in the diagnosis, prognosis, and monitoring of a wide variety of conditions. Designed for the health care provider who must use and explain the often complex results of these tests, this book details in understandable language the various applications of chromosome analysis in clinical settings and the clinical significance of abnormal results. In addition, the book offers an informative tutorial on basic laboratory procedures (including microscopy, photomicrography, automation, computerized karyotyping, and QA/QC), reports on novel synergistic technologies such as FISH, and discusses issues in genetic counseling. Enlightening and accessible, The Principles of Clinical Cytogenetics constitutes an indispensable reference for today's physicians and managed care practitioners who depend on the cytogenetics laboratory for the diagnosis of their patients' ailments.
Chromosome Structure and Aberrations
Author | : Tariq Ahmad Bhat |
Publisher | : Springer |
Total Pages | : 377 |
Release | : 2017-02-08 |
Genre | : Medical |
ISBN | : 8132236734 |
This book is a compilation of various chapters contributed by a group of leading researchers from different countries and covering up to date information based on published reports and personal experience of authors in the field of cytogenetics. Beginning with the introduction of chromosome, the subsequent chapters on organization of genetic material, karyotype evolution, structural and numerical variations in chromosomes, B-chromosomes and chromosomal aberrations provide an in-depth knowledge and easy understanding of the subject matter. A special feature of the book is the inclusion of a series of chapters on various types of chromosomal aberrations and their impact on breeding behaviour and crop improvement. The possible mechanism, their consequences and role in genetic analysis has been emphasized in these chapters. A few chapters have also been dedicated on various techniques routinely used in the laboratory by students and researchers. Each chapter ends with an extensive bibliography so that the students and researchers may find it relevant to consult more literature on the subject than a book of this size can offer. The book is intended to fulfill the needs of undergraduate and post graduate students of botany, zoology and agriculture besides, teachers and researchers engaged in the field of genetics, cytogenetics, and molecular genetics. In general the readers will find each chapter of the book informative and easy to understand.
Cancer Grading Manual
Author | : Ivan Damjanov |
Publisher | : Springer Science & Business Media |
Total Pages | : 223 |
Release | : 2013-02-26 |
Genre | : Medical |
ISBN | : 3642345166 |
This is the second edition of a practice-oriented, well-illustrated manual on the microscopic grading of tumors. After an introduction on the history and basic tenets of tumor grading, subsequent chapters focus on specific organ systems. In each case, the most widely used system for grading common tumors is presented and discussed. Throughout, careful attention is paid to the principles of microscopic tumor grading, ancillary methods to improve grading, and the latest techniques used in evaluating tumors and formulating prognosis. Since the first edition, all chapters have been updated to reflect revisions in the clinical practice of pathology and to explain the role of novel immunohistochemistry and molecular biology techniques. In addition, a new chapter is devoted to the latest trends in cancer grading, and further illustrations have been included. Cancer Grading Manual is a superb resource for both diagnostic surgical pathologists and pathology residents.