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Author: Georgiĭ Leonidovich Saksaganskiĭ Publisher: Taylor & Francis ISBN: 9783718656684 Category : Science Languages : en Pages : 388
Book Description
This unique monograph discusses all aspects of the design and operation of electrophysical ultrahigh-vacuum pumps (EUVP). The adsorption-diffusion model of interaction of gas molecules with metal getters is presented, together with the getter films sorption characteristics. A mathematical model of molecular transfer in electrophysical pumps and the
Author: Georgiĭ Leonidovich Saksaganskiĭ Publisher: Taylor & Francis ISBN: 9783718656684 Category : Science Languages : en Pages : 388
Book Description
This unique monograph discusses all aspects of the design and operation of electrophysical ultrahigh-vacuum pumps (EUVP). The adsorption-diffusion model of interaction of gas molecules with metal getters is presented, together with the getter films sorption characteristics. A mathematical model of molecular transfer in electrophysical pumps and the
Author: Armin Kargol Publisher: Morgan & Claypool Publishers ISBN: 1643274104 Category : Science Languages : en Pages : 117
Book Description
All living matter is comprised of cells, small compartments isolated from the environment by a cell membrane and filled with concentrated solutions of various organic and inorganic compounds. Some organisms are single-cell, where all life functions are performed by that cell. Others have groups of cells, or entire organs, specializing in one particular function. The survival of the entire organism depends on all of its cells and organs fulfilling their roles. While the cells are studied by different sciences, they are seen differently by biologists, chemists, or physicists. Biologists concentrate their attention on cell structure and function. What does the cell consist of? Where are its organelles? What function does each organelle fulfil? From a chemists' point of view, a cell is a complex chemical reaction chamber where various molecules are synthesized or degraded. The main question is how these, sometimes very complicated chains of reactions are controlled. Finally, from a physics standpoint, one of the main questions is the physical movement of all these molecules between organelles within the cell, as well as their exchange with the extracellular medium. The aim of this book is to look into the basic physical phenomena occurring in cells. These physical transport processes facilitate chemical reactions in the cell and that in turn leads to the biological functions necessary for the cell to satisfy its role in the mother organism. Ultimately, the goals of every cell are to stay alive and to fulfil its function as a part of a larger organ or organism. This book is an inventory of physical transport processes occurring in cells while the second volume will be a closer look at how complex biological and physiological cell phenomena result from these very basic physical processes.
Author: J.P. Andersen Publisher: Elsevier ISBN: 0080877079 Category : Science Languages : en Pages : 273
Book Description
Both eukaryotic and prokaryotic cells depend strongly on the function of ion pumps present in their membranes. The term ion pump, synonymous with active ion-transport system, refers to a membrane-associated protein that translocates ions uphill against an electrochemical potential gradient. Primary ion pumps utilize energy derived from chemical reactions or from the absorption of light, while secondary ion pumps derive the energy for uphill movement of one ionic species from the downhill movement of another species. In the present volume, various aspects of ion pump structure, mechanism, and regulation are treated using mostly the ion-transporting ATPases as examples. One chapter has been devoted to a secondary ion pump, the Na+-Ca2+ exchanger, not only because of the vital role played by this transport system in regulation of cardiac contractility, but also because it exemplifies the interesting mechanistic and structural similarities between primary and secondary pumps.
Author: Piero P. Foa Publisher: Springer Science & Business Media ISBN: 1461225965 Category : Science Languages : en Pages : 605
Book Description
Omnis cellula e cellula, "every cell from a cell," was dogma to the 19th century cellular physiologist and the cornerstone of Virchow's Cellular pathologie. "Spread out a cell into a layer and you will find that, in ceasing to be a cell, it has ceased to act as such," wrote the British 1 physiologist G . R. Lewes more than a century age. "The cell remains vital as long as its wall remains intact . . . " keeping its content "pure and clear" and thus preserving the "vital principle" within, echoed Claude 2 Bernard a few years later. The notion of the cell membrane as a pro tecting envelope held sway until it became clear that it could not account for the "coalescence" of poorly differentiated embryonic "vesicles" and for their transformation into "cell-like structures" capable of auto regulation and yet subject to what the grandfather of one of us defined as the "federal obligations imposed by the whole organism. ,,3 A new concept was needed, and soon the membrane was described as a structure capable of uniting as well as separating adjacent cells. Morphologic evidence for this dual function was obtained several years later when the electron microscope revealed the existence of tight and gap junc tions which, acting as intercellular bonds and channels, allowed the cells to communicate with one another and thus coordinate their biologic activities.
Author: Hiromu Yawo Publisher: Springer Nature ISBN: 9811587639 Category : Medical Languages : en Pages : 648
Book Description
This book, now in a thoroughly revised second edition, offers a comprehensive review of the rapidly growing field of optogenetics, in which light-sensing proteins are genetically engineered into cells in order to acquire information on cellular physiology in optical form or to enable control of specific network in the brain upon activation by light. Light-sensing proteins of various living organisms are now available to be exogenously expressed in neurons and other target cells both in vivo and in vitro. Cellular functions can thus be manipulated or probed by light. The new edition documents fully the extensive progress since publication of the first edition to provide an up-to-date overview of the physical, chemical, and biological properties of light-sensing proteins and their application in biological systems, particularly in neuroscience but also in medicine and the optical sciences. Underlying principles are explained and detailed information provided on a wide range of optogenetic tools for the observation and control of cellular signaling and physiology, gene targeting technologies, and optical methods for biological applications. In presenting the current status of optogenetics and emerging directions, this milestone publication will be a “must read” for all involved in research in any way related to optogenetics.
Author: Wilfred D. Stein Publisher: Elsevier ISBN: 0124165834 Category : Science Languages : en Pages : 423
Book Description
An introduction to the principles of membrane transport: How molecules and ions move across the cell membrane by simple diffusion and by making use of specialized membrane components (channels, carriers, and pumps). The text emphasizes the quantitative aspects of such movement and its interpretation in terms of transport kinetics. Molecular studies of channels, carriers, and pumps are described in detail as well as structural principles and the fundamental similarities between the various transporters and their evolutionary interrelationships. The regulation of transporters and their role in health and disease are also considered. Provides an introduction to the properties of transport proteins: channels, carriers, and pumps Presents up-to-date information on the structure of transport proteins and on their function and regulation Includes introductions to transport kinetics and to the cloning of genes that code transport proteins Furnishes a link between the experimental basis of the subject and theoretical model building
Author: Jens Peter Andersen Publisher: ISBN: 9780762302871 Category : Electronic books Languages : en Pages : 501
Book Description
Both eukaryotic and prokaryotic cells depend strongly on the function of ion pumps present in their membranes. The term ion pump, synonymous with active ion-transport system, refers to a membrane-associated protein that translocates ions uphill against an electrochemical potential gradient. Primary ion pumps utilize energy derived from chemical reactions or from the absorption of light, while secondary ion pumps derive the energy for uphill movement of one ionic species from the downhill movement of another species. In the present volume, various aspects of ion pump structure, mechanism, and regulation are treated using mostly the ion-transporting ATPases as examples. One chapter has been devoted to a secondary ion pump, the Na+-Ca2+ exchanger, not only because of the vital role played by this transport system in regulation of cardiac contractility, but also because it exemplifies the interesting mechanistic and structural similarities between primary and secondary pumps.
Author: Tom Wujec Publisher: ISBN: 9780385251136 Category : Thought and thinking Languages : en Pages : 0
Book Description
Does your mind wander when you think through a problem at home or at work? Do you have trouble remembering vital names, dates, facts? Instead of making creative leaps, are you all too often confronted with mental blocks? It may be that your mind is suffering from lack of exercise. In "Pumping Ions author Tom Wujec shows you how to strengthen, flex, tone, and coordinate you "mental muscles," conditioning the brain just as you do the body. Perfect for the student, business person, or anyone who feels their mind has grown "flabby," this fully-illustrated guide provides dozens of easy exercises designed to: -increase attention span -improve memory -enhance creativity -Stretch imagination -build up powers of deduction and analysis -hone decision-making skills It also exlains many invaluable techniques for relaxation, visualization, verbalization, and learning. Packed with intriguing puzzles, provocative ideas, and suggestions, this fascinating book can help you develop your very own mental fitness program--and gain the ultimate competitive edge in business, school, or recreation.
Author: Georgiĭ Leonidovich Saksaganskiĭ
Author: Georgiĭ Leonidovich Saksaganskiĭ
Author: Armin Kargol
Author: Bruce Alberts
Author: J.P. Andersen
Author: Piero P. Foa
Author: Hiromu Yawo
Author: Wilfred D. Stein
Author: Jens Peter Andersen
Author: Tom Wujec
Author: Wilfred D. Stein