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| define concentration gradient in biology: Encyclopedia of Astrobiology Ricardo Amils, Muriel Gargaud, José Cernicharo Quintanilla, Henderson James Cleaves, William M. Irvine, Daniele Pinti, Michel Viso, 2021-01-14 The interdisciplinary field of Astrobiology constitutes a joint arena where provocative discoveries are coalescing concerning, e.g. the prevalence of exoplanets, the diversity and hardiness of life, and its increasingly likely chances for its emergence. Biologists, astrophysicists, biochemists, geoscientists and space scientists share this exciting mission of revealing the origin and commonality of life in the Universe. The members of the different disciplines are used to their own terminology and technical language. In the interdisciplinary environment many terms either have redundant meanings or are completely unfamiliar to members of other disciplines. The Encyclopedia of Astrobiology serves as the key to a common understanding. Each new or experienced researcher and graduate student in adjacent fields of astrobiology will appreciate this reference work in the quest to understand the big picture. The carefully selected group of active researchers contributing to this work and the expert field editors intend for their contributions, from an internationally comprehensive perspective, to accelerate the interdisciplinary advance of astrobiology. |
| define concentration gradient in biology: Concepts of Biology Samantha Fowler, Rebecca Roush, James Wise, 2023-05-12 Black & white print. Concepts of Biology is designed for the typical introductory biology course for nonmajors, covering standard scope and sequence requirements. The text includes interesting applications and conveys the major themes of biology, with content that is meaningful and easy to understand. The book is designed to demonstrate biology concepts and to promote scientific literacy. |
| define concentration gradient in biology: Molecular Biology of the Cell , 2002 |
| define concentration gradient in biology: Cell Biology by the Numbers Ron Milo, Rob Phillips, 2015-12-07 A Top 25 CHOICE 2016 Title, and recipient of the CHOICE Outstanding Academic Title (OAT) Award. How much energy is released in ATP hydrolysis? How many mRNAs are in a cell? How genetically similar are two random people? What is faster, transcription or translation?Cell Biology by the Numbers explores these questions and dozens of others provid |
| define concentration gradient in biology: Exocytosis and Endocytosis Andrei I. Ivanov, 2008 In this book, skilled experts provide the most up-to-date, step-by-step laboratory protocols for examining molecular machinery and biological functions of exocytosis and endocytosis in vitro and in vivo. The book is insightful to both newcomers and seasoned professionals. It offers a unique and highly practical guide to versatile laboratory tools developed to study various aspects of intracellular vesicle trafficking in simple model systems and living organisms. |
| define concentration gradient in biology: Principles of Biology Lisa Bartee, Walter Shiner, Catherine Creech, 2017 The Principles of Biology sequence (BI 211, 212 and 213) introduces biology as a scientific discipline for students planning to major in biology and other science disciplines. Laboratories and classroom activities introduce techniques used to study biological processes and provide opportunities for students to develop their ability to conduct research. |
| define concentration gradient in biology: The Core Concepts of Physiology Joel Michael, William Cliff, Jenny McFarland, Harold Modell, Ann Wright, 2017-02-20 This book offers physiology teachers a new approach to teaching their subject that will lead to increased student understanding and retention of the most important ideas. By integrating the core concepts of physiology into individual courses and across the entire curriculum, it provides students with tools that will help them learn more easily and fully understand the physiology content they are asked to learn. The authors present examples of how the core concepts can be used to teach individual topics, design learning resources, assess student understanding, and structure a physiology curriculum. |
| define concentration gradient in biology: Cells: Molecules and Mechanisms Eric Wong, 2009 Yet another cell and molecular biology book? At the very least, you would think that if I was going to write a textbook, I should write one in an area that really needs one instead of a subject that already has multiple excellent and definitive books. So, why write this book, then? First, it's a course that I have enjoyed teaching for many years, so I am very familiar with what a student really needs to take away from this class within the time constraints of a semester. Second, because it is a course that many students take, there is a greater opportunity to make an impact on more students' pocketbooks than if I were to start off writing a book for a highly specialized upper- level course. And finally, it was fun to research and write, and can be revised easily for inclusion as part of our next textbook, High School Biology.--Open Textbook Library. |
| define concentration gradient in biology: Fractals in Physics L. Pietronero, E. Tosatti, 2012-12-02 Fractals in Physics |
| define concentration gradient in biology: Signal Processing for Neuroscientists Wim van Drongelen, 2006-12-18 Signal Processing for Neuroscientists introduces analysis techniques primarily aimed at neuroscientists and biomedical engineering students with a reasonable but modest background in mathematics, physics, and computer programming. The focus of this text is on what can be considered the 'golden trio' in the signal processing field: averaging, Fourier analysis, and filtering. Techniques such as convolution, correlation, coherence, and wavelet analysis are considered in the context of time and frequency domain analysis. The whole spectrum of signal analysis is covered, ranging from data acquisition to data processing; and from the mathematical background of the analysis to the practical application of processing algorithms. Overall, the approach to the mathematics is informal with a focus on basic understanding of the methods and their interrelationships rather than detailed proofs or derivations. One of the principle goals is to provide the reader with the background required to understand the principles of commercially available analyses software, and to allow him/her to construct his/her own analysis tools in an environment such as MATLAB®. - Multiple color illustrations are integrated in the text - Includes an introduction to biomedical signals, noise characteristics, and recording techniques - Basics and background for more advanced topics can be found in extensive notes and appendices - A Companion Website hosts the MATLAB scripts and several data files: http://www.elsevierdirect.com/companion.jsp?ISBN=9780123708670 |
| define concentration gradient in biology: The Mathematics of Diffusion John Crank, 1979 Though it incorporates much new material, this new edition preserves the general character of the book in providing a collection of solutions of the equations of diffusion and describing how these solutions may be obtained. |
| define concentration gradient in biology: Etching of III-V Semiconductors Peter H. L. Notten, John J. Kelly, 1991 |
| define concentration gradient in biology: Anatomy & Physiology Lindsay Biga, Devon Quick, Sierra Dawson, Amy Harwell, Robin Hopkins, Joel Kaufmann, Mike LeMaster, Philip Matern, Katie Morrison-Graham, Jon Runyeon, 2019-09-26 A version of the OpenStax text |
| define concentration gradient in biology: Electrons in Solids 2e Richard Bube, 2012-12-02 Electrons in Solids, Second Edition: An Introductory Survey introduces the reader to electrons in solids and covers topics ranging from particles and waves to the free electron model, energy bands, and junctions. Optical and electrical properties are also discussed, along with magnetic properties. The wavelike properties of all of matter are chosen as an integrating theme into which to weave such themes as crystal lattice vibrations (with their effect on electron mobility and electrical and thermal conductivity), electromagnetic waves (with their effect on optical reflection and absorption), and electronic transport in solids (with its dependence on the wavelike properties of electrons). This book is comprised of 11 chapters and begins with an overview of particles and waves, together with classical views of electrons, light, and energy. The general properties of waves are then discussed, with particular reference to traveling waves, standing waves, transverse waves, and longitudinal waves. Lattice waves, light waves, and matter waves are also considered. The reader is also introduced to wave equations, boundary conditions, and general wave properties. The remaining chapters are devoted to optical, electrical, and magnetic properties as well as junctions, including metal-metal junctions, metal-semiconductor junctions, and metal-semiconductor junctions. This monograph is intended for undergraduates and first-year graduate students with a background primarily in materials science, metallurgy, or one of the other engineering disciplines. |
| define concentration gradient in biology: Micro and Nano Systems for Biophysical Studies of Cells and Small Organisms Xinyu Liu, Yu Sun, 2021-08-14 Micro and Nano Systems for Biophysical Studies of Cells and Small Organisms provides a comprehensive introduction to the state-of-the-art micro and nano systems that have recently been developed and applied to biophysical studies of cells and small organisms. These micro and nano systems span from microelectromechanical systems (MEMS) and microfluidic devices to robotic micro-nanomanipulation systems. These biophysical studies range from cell mechanics to the neural science of worms and Drosophila. This book will help readers understand the fundamentals surrounding the development of these tools and teach them the most recent advances in cellular and organismal biophysics enabled by these technologies. - Comprehensive coverage of micro and nano-system technology and application to biophysical studies of cells and small organisms. - Highlights the most recent advances in cellular and organismal biophysics enabled by micro and nano systems. - Insightful outlook on future directions and trends in each chapter covering a sub-area of the book topic. |
| define concentration gradient in biology: Biology for AP ® Courses Julianne Zedalis, John Eggebrecht, 2017-10-16 Biology for AP® courses covers the scope and sequence requirements of a typical two-semester Advanced Placement® biology course. The text provides comprehensive coverage of foundational research and core biology concepts through an evolutionary lens. Biology for AP® Courses was designed to meet and exceed the requirements of the College Board’s AP® Biology framework while allowing significant flexibility for instructors. Each section of the book includes an introduction based on the AP® curriculum and includes rich features that engage students in scientific practice and AP® test preparation; it also highlights careers and research opportunities in biological sciences. |
| define concentration gradient in biology: Principles of Environmental Physics John Monteith, M. H. Unsworth, 1990-02-15 Thoroughly revised and up-dated edition of a highly successful textbook. |
| define concentration gradient in biology: 24th European Symposium on Computer Aided Process Engineering , 2014-06-20 The 24th European Symposium on Computer Aided Process Engineering creates an international forum where scientific and industrial contributions of computer-aided techniques are presented with applications in process modeling and simulation, process synthesis and design, operation, and process optimization. The organizers have broadened the boundaries of Process Systems Engineering by inviting contributions at different scales of modeling and demonstrating vertical and horizontal integration. Contributions range from applications at the molecular level to the strategic level of the supply chain and sustainable development. They cover major classical themes, at the same time exploring a new range of applications that address the production of renewable forms of energy, environmental footprints and sustainable use of resources and water. |
| define concentration gradient in biology: Membrane Physiology Thomas E. Andreoli, Darrell D. Fanestil, Joseph F. Hoffman, Stanley G. Schultz, 2012-12-06 Membrane Physiology (Second Edition) is a soft-cover book containing portions of Physiology of Membrane Disorders (Second Edition). The parent volume contains six major sections. This text encompasses the first three sections: The Nature of Biological Membranes, Methods for Studying Membranes, and General Problems in Membrane Biology. We hope that this smaller volume will be helpful to individuals interested in general physiology and the methods for studying general physiology. THOMAS E. ANDREOLI JOSEPH F. HOFFMAN DARRELL D. FANESTIL STANLEY G. SCHULTZ vii Preface to the Second Edition The second edition of Physiology of Membrane Disorders represents an extensive revision and a considerable expansion of the first edition. Yet the purpose of the second edition is identical to that of its predecessor, namely, to provide a rational analysis of membrane transport processes in individual membranes, cells, tissues, and organs, which in tum serves as a frame of reference for rationalizing disorders in which derangements of membrane transport processes playa cardinal role in the clinical expression of disease. As in the first edition, this book is divided into a number of individual, but closely related, sections. Part V represents a new section where the problem of transport across epithelia is treated in some detail. Finally, Part VI, which analyzes clinical derangements, has been enlarged appreciably. |
| define concentration gradient in biology: Cellular and Molecular Neurophysiology Constance Hammond, 2014-12-30 Cellular and Molecular Neurophysiology, Fourth Edition, is the only up-to-date textbook on the market that focuses on the molecular and cellular physiology of neurons and synapses. Hypothesis-driven rather than a dry presentation of the facts, the book promotes a real understanding of the function of nerve cells that is useful for practicing neurophysiologists and students in a graduate-level course on the topic alike. This new edition explains the molecular properties and functions of excitable cells in detail and teaches students how to construct and conduct intelligent research experiments. The content is firmly based on numerous experiments performed by top experts in the field This book will be a useful resource for neurophysiologists, neurobiologists, neurologists, and students taking graduate-level courses on neurophysiology. - 70% new or updated material in full color throughout, with more than 350 carefully selected and constructed illustrations - Fifteen appendices describing neurobiological techniques are interspersed in the text |
| define concentration gradient in biology: Everyday Applied Geophysics 1 Nicolas Florsch, Frederic Muhlach, 2017-11-24 Everyday Applied Geophysics 1 covers the physical methods permitting the environmental exploration of the sub-surface in 1, 2, 3 or 4 dimensions (the last is for time-lapse in terms of physical environmental state and geometry). The ground is transparent to electrical currents, electromagnetic induction, magnetic fields and seismic (acoustic) waves. All extend our senses by using the propagation of these phenomena through underground materials. The book specifically addresses the methods feasible, accessible and affordable to all users, and provides simple apparatus electronic diagrams. The book also features open-source and free software links for data interpretation. - Covers physical methods permitting the environmental exploration of the sub-surface in 1, 2, 3 or 4 dimensions - Addresses the methods feasible, accessible and affordable to all users - Provides simple apparatus electronic diagrams, as well as open-source and free software links for data interpretation |
| define concentration gradient in biology: Advances in Membrane Technologies for Water Treatment Angelo Basile, Alfredo Cassano, Navin Kumar Rastogi, 2015-02-28 Advances in Membrane Technologies for Water Treatment: Materials, Processes and Applications provides a detailed overview of advanced water treatment methods involving membranes, which are increasingly seen as effective replacements for a range of conventional water treatment methods. The text begins with reviews of novel membrane materials and advances in membrane operations, then examines the processes involved with improving membrane performance. Final chapters cover the application of membrane technologies for use in water treatment, with detailed discussions on municipal wastewater and reuse in the textile and paper industries. - Provides a detailed overview of advanced water treatment methods involving membranes - Coverage includes advancements in membrane materials, improvement in membrane performance, and their applications in water treatment - Discusses the use of membrane technologies in the production of drinking water, desalination, wastewater treatment, and recovery |
| define concentration gradient in biology: An Invitation to Applied Mathematics Carmen Chicone, 2016-09-24 An Invitation to Applied Mathematics: Differential Equations, Modeling, and Computation introduces the reader to the methodology of modern applied mathematics in modeling, analysis, and scientific computing with emphasis on the use of ordinary and partial differential equations. Each topic is introduced with an attractive physical problem, where a mathematical model is constructed using physical and constitutive laws arising from the conservation of mass, conservation of momentum, or Maxwell's electrodynamics. Relevant mathematical analysis (which might employ vector calculus, Fourier series, nonlinear ODEs, bifurcation theory, perturbation theory, potential theory, control theory, or probability theory) or scientific computing (which might include Newton's method, the method of lines, finite differences, finite elements, finite volumes, boundary elements, projection methods, smoothed particle hydrodynamics, or Lagrangian methods) is developed in context and used to make physically significant predictions. The target audience is advanced undergraduates (who have at least a working knowledge of vector calculus and linear ordinary differential equations) or beginning graduate students. Readers will gain a solid and exciting introduction to modeling, mathematical analysis, and computation that provides the key ideas and skills needed to enter the wider world of modern applied mathematics. - Presents an integrated wealth of modeling, analysis, and numerical methods in one volume - Provides practical and comprehensible introductions to complex subjects, for example, conservation laws, CFD, SPH, BEM, and FEM - Includes a rich set of applications, with more appealing problems and projects suggested |
| define concentration gradient in biology: Voltage Gated Sodium Channels Peter C. Ruben, 2014-04-15 A number of techniques to study ion channels have been developed since the electrical basis of excitability was first discovered. Ion channel biophysicists have at their disposal a rich and ever-growing array of instruments and reagents to explore the biophysical and structural basis of sodium channel behavior. Armed with these tools, researchers have made increasingly dramatic discoveries about sodium channels, culminating most recently in crystal structures of voltage-gated sodium channels from bacteria. These structures, along with those from other channels, give unprecedented insight into the structural basis of sodium channel function. This volume of the Handbook of Experimental Pharmacology will explore sodium channels from the perspectives of their biophysical behavior, their structure, the drugs and toxins with which they are known to interact, acquired and inherited diseases that affect sodium channels and the techniques with which their biophysical and structural properties are studied. |
| define concentration gradient in biology: Fusion Technology 1990 B.E. Keen, M. Huguet, R.M. Hemsworth, 2012-12-02 The aim of the biennial series of symposia on Fusion Technology, organized by the European Fusion Laboratories, is the exchange of information on the design, construction and operation of fusion experiments. The coverage of the volume includes the technology aspects of fusion reactors to provide a link to the technology of new developments and form a guideline for the definition of future work. These proceedings comprise two volumes and contain both the invited lectures and contributed papers presented at the Symposium, which was attended by 556 participants from around the globe. The 312 papers in this volume, including 17 invited papers, give a broad and current overview of the progress and trends fusion technology is experiencing now, and the future for fusion devices. |
| define concentration gradient in biology: The Extracellular Matrix: an Overview Robert Mecham, 2011-02-16 Knowledge of the extracellular matrix (ECM) is essential to understand cellular differentiation, tissue development, and tissue remodeling. This volume of the series “Biology of Extracellular Matrix” provides a timely overview of the structure, regulation, and function of the major macromolecules that make up the extracellular matrix. It covers topics such as collagen types and assembly of collagen-containing suprastructures, basement membrane, fibronectin and other cell-adhesive glycoproteins, proteoglycans, microfibrils, elastin, fibulins and matricellular proteins, such as thrombospondin. It also explores the concept that ECM components together with their cell surface receptors can be viewed as intricate nano-devices that allow cells to physically organize their 3-D-environment. Further, the role of the ECM in human disease and pathogenesis is discussed as well as the use of model organisms in elucidating ECM function. |
| define concentration gradient in biology: Comprehensive Biophysics , 2012-04-12 Biophysics is a rapidly-evolving interdisciplinary science that applies theories and methods of the physical sciences to questions of biology. Biophysics encompasses many disciplines, including physics, chemistry, mathematics, biology, biochemistry, medicine, pharmacology, physiology, and neuroscience, and it is essential that scientists working in these varied fields are able to understand each other's research. Comprehensive Biophysics, Nine Volume Set will help bridge that communication gap. Written by a team of researchers at the forefront of their respective fields, under the guidance of Chief Editor Edward Egelman, Comprehensive Biophysics, Nine Volume Set provides definitive introductions to a broad array of topics, uniting different areas of biophysics research - from the physical techniques for studying macromolecular structure to protein folding, muscle and molecular motors, cell biophysics, bioenergetics and more. The result is this comprehensive scientific resource - a valuable tool both for helping researchers come to grips quickly with material from related biophysics fields outside their areas of expertise, and for reinforcing their existing knowledge. Biophysical research today encompasses many areas of biology. These studies do not necessarily share a unique identifying factor. This work unites the different areas of research and allows users, regardless of their background, to navigate through the most essential concepts with ease, saving them time and vastly improving their understanding The field of biophysics counts several journals that are directly and indirectly concerned with the field. There is no reference work that encompasses the entire field and unites the different areas of research through deep foundational reviews. Comprehensive Biophysics fills this vacuum, being a definitive work on biophysics. It will help users apply context to the diverse journal literature offering, and aid them in identifying areas for further research Chief Editor Edward Egelman (E-I-C, Biophysical Journal) has assembled an impressive, world-class team of Volume Editors and Contributing Authors. Each chapter has been painstakingly reviewed and checked for consistent high quality. The result is an authoritative overview which ties the literature together and provides the user with a reliable background information and citation resource |
| define concentration gradient in biology: Anatomy and Physiology J. Gordon Betts, Peter DeSaix, Jody E. Johnson, Oksana Korol, Dean H. Kruse, Brandon Poe, James A. Wise, Mark Womble, Kelly A. Young, 2013-04-25 |
| define concentration gradient in biology: Biophysics William Bialek, 2012-12-17 A physicist's guide to the phenomena of life Interactions between the fields of physics and biology reach back over a century, and some of the most significant developments in biology—from the discovery of DNA's structure to imaging of the human brain—have involved collaboration across this disciplinary boundary. For a new generation of physicists, the phenomena of life pose exciting challenges to physics itself, and biophysics has emerged as an important subfield of this discipline. Here, William Bialek provides the first graduate-level introduction to biophysics aimed at physics students. Bialek begins by exploring how photon counting in vision offers important lessons about the opportunities for quantitative, physics-style experiments on diverse biological phenomena. He draws from these lessons three general physical principles—the importance of noise, the need to understand the extraordinary performance of living systems without appealing to finely tuned parameters, and the critical role of the representation and flow of information in the business of life. Bialek then applies these principles to a broad range of phenomena, including the control of gene expression, perception and memory, protein folding, the mechanics of the inner ear, the dynamics of biochemical reactions, and pattern formation in developing embryos. Featuring numerous problems and exercises throughout, Biophysics emphasizes the unifying power of abstract physical principles to motivate new and novel experiments on biological systems. Covers a range of biological phenomena from the physicist's perspective Features 200 problems Draws on statistical mechanics, quantum mechanics, and related mathematical concepts Includes an annotated bibliography and detailed appendixes |
| define concentration gradient in biology: Principles and Models of Biological Transport Morton H. Friedman, 2012-12-06 This text is designed for a first course in biological mass transport, and the material in it is presented at a level that is appropriate to advanced undergraduates or early graduate level students. Its orientation is somewhat more physical and mathematical than a biology or standard physiology text, reflecting its origins in a transport course that I teach to undergraduate (and occasional graduate) biomedical engineering students in the Whiting School of Engineering at Johns Hopkins. The audience for my cours- and presumably for this text - also includes chemical engineering undergraduates concentrating in biotechnology, and graduate students in biophysics. The organization of this book differs from most texts that at tempt to present an engineering approach to biological transport. What distinguishes biological transport from other mass transfer processes is the fact that biological transport is biological. Thus, we do not start with the engineering principles of mass transport (which are well presented elsewhere) and then seek biological ap plications of these principles; rather, we begin with the biological processes themselves, and then develop the tools that are needed to describe them. As a result, more physiology is presented in this text than is often found in books dealing with engineering applica tions in the life sciences. |
| define concentration gradient in biology: Why Evolution is True Jerry A. Coyne, 2010-01-14 For all the discussion in the media about creationism and 'Intelligent Design', virtually nothing has been said about the evidence in question - the evidence for evolution by natural selection. Yet, as this succinct and important book shows, that evidence is vast, varied, and magnificent, and drawn from many disparate fields of science. The very latest research is uncovering a stream of evidence revealing evolution in action - from the actual observation of a species splitting into two, to new fossil discoveries, to the deciphering of the evidence stored in our genome. Why Evolution is True weaves together the many threads of modern work in genetics, palaeontology, geology, molecular biology, anatomy, and development to demonstrate the 'indelible stamp' of the processes first proposed by Darwin. It is a crisp, lucid, and accessible statement that will leave no one with an open mind in any doubt about the truth of evolution. |
| define concentration gradient in biology: Introduction to Basics of Pharmacology and Toxicology Gerard Marshall Raj, Ramasamy Raveendran, 2019-11-16 This book illustrates, in a comprehensive manner, the most crucial principles involved in pharmacology and allied sciences. The title begins by discussing the historical aspects of drug discovery, with up to date knowledge on Nobel Laureates in pharmacology and their significant discoveries. It then examines the general pharmacological principles - pharmacokinetics and pharmacodynamics, with in-depth information on drug transporters and interactions. In the remaining chapters, the book covers a definitive collection of topics containing essential information on the basic principles of pharmacology and how they are employed for the treatment of diseases. Readers will learn about special topics in pharmacology that are hard to find elsewhere, including issues related to environmental toxicology and the latest information on drug poisoning and treatment, analytical toxicology, toxicovigilance, and the use of molecular biology techniques in pharmacology. The book offers a valuable resource for researchers in the fields of pharmacology and toxicology, as well as students pursuing a degree in or with an interest in pharmacology. |
| define concentration gradient in biology: Microbiology Nina Parker, OpenStax, Mark Schneegurt, AnhHue Thi Tu, Brian M. Forster, Philip Lister, 2016-05-30 Microbiology covers the scope and sequence requirements for a single-semester microbiology course for non-majors. The book presents the core concepts of microbiology with a focus on applications for careers in allied health. The pedagogical features of the text make the material interesting and accessible while maintaining the career-application focus and scientific rigor inherent in the subject matter. Microbiology's art program enhances students' understanding of concepts through clear and effective illustrations, diagrams, and photographs. Microbiology is produced through a collaborative publishing agreement between OpenStax and the American Society for Microbiology Press. The book aligns with the curriculum guidelines of the American Society for Microbiology.--BC Campus website. |
| define concentration gradient in biology: Diffusion Fundamentals Jörg Kärger, 2005 |
| define concentration gradient in biology: Stomatal Physiology Paul Gordon Jarvis, T. A. Mansfield, 1981-08-13 This volume contains papers on anatomy, physiology and action of stomata. |
| define concentration gradient in biology: Transport in Plants II U. Lüttge, M.G. Pitman, 1976-05-01 As plant physiology increased steadily in the latter half of the 19th century, problems of absorption and transport of water and of mineral nutrients and problems of the passage of metabolites from one cell to another were investigated, especially in Germany. JUSTUS VON LIEBIG, who was born in Darmstadt in 1803, founded agricultural chemistry and developed the techniques of mineral nutrition in agricul ture during the 70 years of his life. The discovery of plasmolysis by NAGEL! (1851), the investigation of permeability problems of artificial membranes by TRAUBE (1867) and the classical work on osmosis by PFEFFER (1877) laid the foundations for our understanding of soluble substances and osmosis in cell growth and cell mechanisms. Since living membranes were responsible for controlling both water movement and the substances in solution, permeability became a major topic for investigation and speculation. The problems then discussed under that heading included passive permeation by diffusion, Donnan equilibrium adjustments, active transport processes and antagonism between ions. In that era, when organelle isolation by differential centrifugation was unknown and the electron microscope had not been invented, the number of cell membranes, their thickness and their composition, were matters for conjecture. The nature of cell surface membranes was deduced with remarkable accuracy from the reactions of cells to substances in solution. In 1895, OVERTON, in U. S. A. , published the hypothesis that membranes were probably lipid in nature because of the greater penetration by substances with higher fat solubility. |
| define concentration gradient in biology: Biological Physics Philip Nelson, 2013-12-16 Biological Physics focuses on new results in molecular motors, self-assembly, and single-molecule manipulation that have revolutionized the field in recent years, and integrates these topics with classical results. The text also provides foundational material for the emerging field of nanotechnology. |
| define concentration gradient in biology: Encyclopedia of Spectroscopy and Spectrometry , 2016-09-22 This third edition of the Encyclopedia of Spectroscopy and Spectrometry, Three Volume Set provides authoritative and comprehensive coverage of all aspects of spectroscopy and closely related subjects that use the same fundamental principles, including mass spectrometry, imaging techniques and applications. It includes the history, theoretical background, details of instrumentation and technology, and current applications of the key areas of spectroscopy. The new edition will include over 80 new articles across the field. These will complement those from the previous edition, which have been brought up-to-date to reflect the latest trends in the field. Coverage in the third edition includes: Atomic spectroscopy Electronic spectroscopy Fundamentals in spectroscopy High-Energy spectroscopy Magnetic resonance Mass spectrometry Spatially-resolved spectroscopic analysis Vibrational, rotational and Raman spectroscopies The new edition is aimed at professional scientists seeking to familiarize themselves with particular topics quickly and easily. This major reference work continues to be clear and accessible and focus on the fundamental principles, techniques and applications of spectroscopy and spectrometry. Incorporates more than 150 color figures, 5,000 references, and 300 articles for a thorough examination of the field Highlights new research and promotes innovation in applied areas ranging from food science and forensics to biomedicine and health Presents a one-stop resource for quick access to answers and an in-depth examination of topics in the spectroscopy and spectrometry arenas |
| define concentration gradient in biology: Transport And Diffusion Across Cell Membranes Wilfred Stein, 2012-12-02 Transport and Diffusion across Cell Membranes is a comprehensive treatment of the transport and diffusion of molecules and ions across cell membranes. This book shows that the same kinetic equations (with appropriate modification) can describe all the specialized membrane transport systems: the pores, the carriers, and the two classes of pumps. The kinetic formalism is developed step by step and the features that make a system effective in carrying out its biological role are highlighted. This book is organized into six chapters and begins with an introduction to the structure and dynamics of cell membranes, followed by a discussion on how the membrane acts as a barrier to the transmembrane diffusion of molecules and ions. The following chapters focus on the role of the membrane's protein components in facilitating transmembrane diffusion of specific molecules and ions, measurements of diffusion through pores and the kinetics of diffusion, and the structure of such pores and their biological regulation. This book methodically introduces the reader to the carriers of cell membranes, the kinetics of facilitated diffusion, and cotransport systems. The primary active transport systems are considered, emphasizing the pumping of an ion (sodium, potassium, calcium, or proton) against its electrochemical gradient during the coupled progress of a chemical reaction while a conformational change of the pump enzyme takes place. This book is of interest to advanced undergraduate students, as well as to graduate students and researchers in biochemistry, physiology, pharmacology, and biophysics. |
| define concentration gradient in biology: Oral Drug Absorption Jennifer B. Dressman, Christos Reppas, 2016-04-19 Oral Drug Absorption, Second Edition thoroughly examines the special equipment and methods used to test whether drugs are released adequately when administered orally. The contributors discuss methods for accurately establishing and validating in vitro/in vivo correlations for both MR and IR formulations, as well as alternative approaches for MR an |
Lab 4 Diffusion, Osmosis, and Tonicity - Community College …
Be able to define molarity, osmolarity, tonicity, isotonic, hypotonic, hypertonic, crenate, lyse, concentration gradient, diffusion, osmosis, and osmotic pressure and hydrostatic pressure. …
Cambridge IGCSE Biology - ScienceSauceOnline
• Define diffusion as the net movement of particles from a region of their higher concentration to a region of their lower concentration down a concentration gradient, as a result of random …
AP Biology Lab 4: Diffusion and Osmosis - WELCOME TO AP …
Like solutes, water moves down its concentration gradient. Water moves from areas of high potential (high free water concentration) and low solute concentration to areas of low potential …
Moving with the Concentration Gradient - Biology by Napier
“Moving with the flow” (i.e. going with the concentration gradient) is the direction of flow in passive transport. Show this in the diagram on right by drawing in 10 total circles (to represent …
CHAPTER 7 MEMBRANE STUCTURE AND FUNCTION Learning …
Explain why a concentration gradient of a substance across a membrane represents potential energy. 13. Distinguish between solutions that are hypertonic, hypotonic, and isotonic to cell …
AQA GCSE Topic 1 Cell Biology – Transport in Cells Key Words
concentration gradient between the water and blood, blood flows through the lamellae in the opposite direction to water flowing over the lamellae so the concentration of oxygen in the …
Osmosis and Diffusion IS3001 - STEM Library Lab
occurs when there is an unequal concentration of molecules in an environment, known as a concentration gradient. These molecules have energy and are constantly in motion, bouncing …
MINISTRY OF EDUCATION SECONDARY ENGAGEMENT …
A diffusion gradient or concentration gradient occurs when there is a difference in the number of molecules, or the concentration of molecules between the two regions. For example, when a …
Osmosis and Diffusion Audience - University of Pennsylvania
We can understand biological phenomena by analyzing them at multiple levels. 1. Molecules move into and out of cells along a concentration gradient. 2. Cells have semi-permeable …
Diffusion and Osmosis – Exercise 4 - PBworks
In biology, the most common type of diffusion is down a concentration gradient from higher to lower concentration. Selectively permeable membrane: Some substances can cross the …
) Biology GCSE - Physics & Maths Tutor
A large concentration gradient - molecules will diffuse from an area of high concentration to an area of low concentration more quickly if there is a large difference in the concentrations. A …
FACTFILE: GCSE BIOLOGY: UNIT 1 - CCEA
• Concentration Gradient – the movement (by diffusion) of particles from a high to a low concentration as long as there is a difference in concentration between two regions. • Diffusion …
Evidence 3: Cell Transport Option 2: Mini Lab
1. Define diffusion – 2. Define concentration gradient – 3. Explain how the food coloring activity demonstrated diffusion. 4. Why can you smell what is INSIDE the balloon? 5. If the odor …
PRENTICE HALL - Virtual Osmosis Lab Activity …
If the concentration of water molecules is greater outside a cell, then the solution is hypotonic to the cell. Water will move into the cell by osmosis. The pressure against the inside of the cell …
Transport Mechanisms through Cell Membranes - rocklinusd.org
Explain how facilitated diffusion differs from diffusion in general. energy. 1. Diffusion. Movement of molecules from high concentration to low concentration. Why can you smell popcorn from …
Virtual Lab 4 Diffusion and Osmosis - burkesci.weebly.com
http://www.phschool.com/science/biology_place/labbench/lab1/intro.html 1) Define diffusion 2) Define concentration gradient 3) Define osmosis Click on a closer look Click on animate and …
1. Cells structure and Organisation - PapaCambridge
Concentration gradient: The difference in concentration between a region of a solution or gas that has a high density of particles and a region that has a relatively lower density of
Lab 05 - Enzymes & Diffusion - PCC
Understand and diagram how a concentration gradient drives diffusion. Understand and diagram how a water concentration gradient drives osmosis. Know what enzymes are and what …
0610/41 BIOLOGY November 2019 - XtremePapers
BIOLOGY 0610/41 Paper 4 Theory (Extended) October/November 2019 1 hour 15 minutes Candidates answer on the Question Paper. No Additional Materials are required. READ …
Protein concentration gradients and switching diffusions
In this paper, we extend our analysis of switching diffusiv-ities to determine its role in protein concentration gradient formation. In particular, we determine how switching diffusivities …
Lab 4 Diffusion, Osmosis, and Tonicity - Community College …
Be able to define molarity, osmolarity, tonicity, isotonic, hypotonic, hypertonic, crenate, lyse, concentration gradient, diffusion, osmosis, and osmotic pressure and hydrostatic pressure. …
Cambridge IGCSE Biology - ScienceSauceOnline
• Define diffusion as the net movement of particles from a region of their higher concentration to a region of their lower concentration down a concentration gradient, as a result of random …
AP Biology Lab 4: Diffusion and Osmosis - WELCOME TO AP …
Like solutes, water moves down its concentration gradient. Water moves from areas of high potential (high free water concentration) and low solute concentration to areas of low potential …
Moving with the Concentration Gradient - Biology by Napier
“Moving with the flow” (i.e. going with the concentration gradient) is the direction of flow in passive transport. Show this in the diagram on right by drawing in 10 total circles (to represent …
CHAPTER 7 MEMBRANE STUCTURE AND FUNCTION Learning …
Explain why a concentration gradient of a substance across a membrane represents potential energy. 13. Distinguish between solutions that are hypertonic, hypotonic, and isotonic to cell …
AQA GCSE Topic 1 Cell Biology – Transport in Cells Key Words
concentration gradient between the water and blood, blood flows through the lamellae in the opposite direction to water flowing over the lamellae so the concentration of oxygen in the …
Osmosis and Diffusion IS3001 - STEM Library Lab
occurs when there is an unequal concentration of molecules in an environment, known as a concentration gradient. These molecules have energy and are constantly in motion, bouncing …
MINISTRY OF EDUCATION SECONDARY ENGAGEMENT …
A diffusion gradient or concentration gradient occurs when there is a difference in the number of molecules, or the concentration of molecules between the two regions. For example, when a …
Osmosis and Diffusion Audience - University of Pennsylvania
We can understand biological phenomena by analyzing them at multiple levels. 1. Molecules move into and out of cells along a concentration gradient. 2. Cells have semi-permeable …
Diffusion and Osmosis – Exercise 4 - PBworks
In biology, the most common type of diffusion is down a concentration gradient from higher to lower concentration. Selectively permeable membrane: Some substances can cross the …
) Biology GCSE - Physics & Maths Tutor
A large concentration gradient - molecules will diffuse from an area of high concentration to an area of low concentration more quickly if there is a large difference in the concentrations. A …
FACTFILE: GCSE BIOLOGY: UNIT 1 - CCEA
• Concentration Gradient – the movement (by diffusion) of particles from a high to a low concentration as long as there is a difference in concentration between two regions. • Diffusion …
Evidence 3: Cell Transport Option 2: Mini Lab
1. Define diffusion – 2. Define concentration gradient – 3. Explain how the food coloring activity demonstrated diffusion. 4. Why can you smell what is INSIDE the balloon? 5. If the odor …
PRENTICE HALL - Virtual Osmosis Lab Activity …
If the concentration of water molecules is greater outside a cell, then the solution is hypotonic to the cell. Water will move into the cell by osmosis. The pressure against the inside of the cell …
Transport Mechanisms through Cell Membranes - rocklinusd.org
Explain how facilitated diffusion differs from diffusion in general. energy. 1. Diffusion. Movement of molecules from high concentration to low concentration. Why can you smell popcorn from …
Virtual Lab 4 Diffusion and Osmosis - burkesci.weebly.com
http://www.phschool.com/science/biology_place/labbench/lab1/intro.html 1) Define diffusion 2) Define concentration gradient 3) Define osmosis Click on a closer look Click on animate and …
1. Cells structure and Organisation - PapaCambridge
Concentration gradient: The difference in concentration between a region of a solution or gas that has a high density of particles and a region that has a relatively lower density of
Lab 05 - Enzymes & Diffusion - PCC
Understand and diagram how a concentration gradient drives diffusion. Understand and diagram how a water concentration gradient drives osmosis. Know what enzymes are and what …
0610/41 BIOLOGY November 2019 - XtremePapers
BIOLOGY 0610/41 Paper 4 Theory (Extended) October/November 2019 1 hour 15 minutes Candidates answer on the Question Paper. No Additional Materials are required. READ …
Protein concentration gradients and switching diffusions
In this paper, we extend our analysis of switching diffusiv-ities to determine its role in protein concentration gradient formation. In particular, we determine how switching diffusivities …
