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  • 1
    Online Resource
    Online Resource
    Cham :Springer International Publishing AG,
    Keywords: Neurosciences. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (453 pages)
    Edition: 1st ed.
    ISBN: 9783319296470
    Series Statement: Interdisciplinary Applied Mathematics Series ; v.43
    DDC: 572.5160151
    Language: English
    Note: Intro -- Preface -- Acknowledgements -- Contents -- Acronyms -- Part I Basic Theory -- 1 Some Background Physiology -- 1.1 Introduction -- 1.2 Common Features of Calcium Dynamics:The Calcium Toolbox -- 1.2.1 Agonists, Receptors, and Second Messengers -- 1.2.2 Internal Compartments -- 1.2.3 Internal Calcium Channels: IPR and RyR -- 1.2.4 IP3 Metabolism -- 1.2.5 Calcium Influx -- 1.2.6 Calcium Removal from the Cytoplasm -- 1.2.7 Calcium-Binding Proteins and Fluorescent Dyes -- 1.2.8 Microdomains and Nanodomains -- 1.3 Spatiotemporal and Hierarchical Organisation -- 1.4 Examples of Calcium Signalling -- 1.4.1 Cardiac Myocytes -- 1.4.2 Airway Smooth Muscle -- 1.4.3 Xenopus Oocytes -- 1.4.4 Pancreatic and Parotid Acinar Cells -- 1.4.5 Airway Epithelial Cells -- 2 The Calcium Toolbox -- 2.1 G Protein-Coupled Receptors -- 2.1.1 A Simple GPCR Model -- 2.1.2 More Complex Receptor Models -- 2.1.3 A Kinetic Model of GPCR Signalling -- 2.2 SERCA and PMCA -- 2.2.1 Unidirectional Models -- 2.2.2 Bidirectional Models -- 2.2.3 Coupling to ATP and pH -- 2.3 The Sodium/Calcium Exchanger -- 2.3.1 Unidirectional Enzyme Model -- 2.3.2 Bidirectional Markov Model -- 2.3.3 Modelling an Electrogenic Exchanger -- 2.3.4 Bidirectional Enzyme Model -- 2.3.5 A Model with Variable Stoichiometry -- 2.4 Mitochondria -- 2.4.1 The Mitochondrial Uniporter -- 2.4.2 The Mitochondrial Sodium/Calcium Exchanger -- 2.5 Voltage-Gated Calcium Channels -- 2.5.1 The Simplest Models -- 2.5.2 Permeation Models of Calcium Channels -- 2.5.3 Inactivation of Calcium Channels by Calcium -- 2.5.4 A Two-Mode Model of Calcium-InducedInactivation -- 2.6 Receptor-Operated and Store-Operated Channels -- 2.6.1 Receptor-Operated Channels -- 2.6.2 Store-Operated Channels -- 2.6.3 STIM-Orai Binding -- 2.7 Inositol Trisphosphate Receptors -- 2.7.1 An Eight-State Markov Model. , 2.7.2 Reduction of the Eight-State Markov Model -- 2.7.3 Gating Models -- 2.7.4 Modal Models -- 2.7.5 Simplifying the Modal Model -- 2.7.6 The Question of Local Calcium Concentration -- 2.7.7 Open Probability and Flux -- 2.8 Ryanodine Receptors -- 2.8.1 An Algebraic Model -- 2.8.2 A Markov Model of RyR Inactivation -- 2.8.3 Luminal Gating -- 2.8.4 Markov Models with Adaptation -- 2.8.5 Two-State Models -- 2.8.6 Modal Gating Model -- 2.9 Calcium Buffers -- 2.9.1 Fast Buffers or Excess Buffers -- 2.9.1.1 A Simplifying Transformation -- 2.10 Inositol Trisphosphate Metabolism -- 2.10.1 IP3 Production -- 2.10.2 IP3 Removal -- 3 Basic Modelling Principles: Deterministic Models -- 3.1 Types of Models -- 3.2 Spatially Homogeneous Models -- 3.2.1 A Model Based on IPR Dynamics -- 3.2.1.1 Steady States and Oscillations -- 3.2.2 A Model Based on ER Refilling -- 3.2.3 A Model That Incorporates MicrodomainsAround IPR -- 3.2.4 Calcium Excitability: Calcium-Induced CalciumRelease -- 3.2.5 Open-Cell and Closed-Cell Models -- 3.2.6 The Importance of Calcium Influx -- 3.2.7 IP3 Dynamics: Class I and Class II Models -- 3.2.7.1 Hybrid Models -- 3.2.7.2 Pulse Experiments -- 3.3 Spatially Distributed Models -- 3.3.1 A Brief Note on Terminology -- 3.3.2 Homogenisation -- 3.3.3 Membrane Fluxes -- 3.3.4 Closed-Cell Spatial Models -- 3.4 Microdomains -- 3.4.1 Calcium at the Mouth of an Open Channel -- 3.4.1.1 The Excess Buffer Approximation -- 3.4.1.2 The Rapid Buffer Approximation -- 3.4.2 Incorporating ER Depletion -- 3.4.3 The Channel as a Disk -- 3.4.4 Calcium Concentration Changes Quickly in Microdomains -- 3.4.5 Microdomains Between Organelles -- 3.4.6 Connecting a Microdomain to the Cell -- 3.4.7 Can Microdomains Be Modelled Deterministically? -- 3.5 Calcium Waves -- 3.5.1 The Fire-Diffuse-Fire Model -- 3.5.2 Continuous Release Sites. , 3.5.3 Waves in Multiple Dimensions -- 3.5.4 Phase Waves -- 3.6 Intercellular Waves -- 3.6.1 Mechanisms of Intercellular Wave Propagation -- 3.6.2 Propagation by Gap Junctions -- 3.6.2.1 An Example: Mechanically-Stimulated Waves in Airway Epithelial Cells -- 3.6.3 Regenerative and Partially Regenerative Waves -- 3.6.4 Paracrine Propagation -- 3.7 Connecting the Cytosol to the Membrane -- 3.8 The Effects of Buffers -- 3.8.1 Qualitative Effects -- 3.8.2 Quantitative Effects -- 4 Hierarchical and Stochastic Modelling -- 4.1 Introduction -- 4.1.1 Hierarchical Modelling Across Different Structural Levels -- 4.1.2 Distributions, Blips, and Puffs -- 4.2 Characteristics of Puffs -- 4.2.1 Interpuff Interval Distributions -- 4.2.2 The Coefficient of Variation -- 4.2.3 Puffs are not Periodic -- 4.3 Properties of Sequences of Cellular Spikes -- 4.3.1 Wave Nucleation -- 4.3.2 The Effects of Buffers on Wave Nucleation -- 4.3.3 Information Content and Signal Encoding -- 4.3.4 Summary -- 4.4 Appendix: An Incomplete Theory of Calcium Spiking -- 4.4.1 Semi-Markov Processes -- 4.4.2 Interpuff Interval Distributions, Puff Duration Distributions and Their Dependencies on Cellular Parameters -- 4.4.3 Detailed Derivation of the First Passage TimeDensity -- 4.4.3.1 Calculations Based on the Laplace Transform of Waiting Time Distributions -- 4.4.3.2 Resampling an IPI Distribution to Obtain an ISI Distribution -- 4.4.4 Some Formulae -- 4.4.5 Summary -- 5 Nonlinear Dynamics of Calcium -- 5.1 An Illustrative Model: The Hybrid Model -- 5.2 Bifurcation Analysis for ODE Models -- 5.3 Model Reduction -- 5.3.1 Identifying Time Scales -- 5.3.2 Reduction Based on Timescale Separation -- 5.4 Analysis Based on Timescale Separation -- 5.4.1 Freezing Slow Variables -- 5.4.2 Geometric Singular Perturbation Theory -- 5.5 Understanding Transient Dynamics. , 5.6 Coupled Voltage and Calcium Models -- 5.7 Calcium Waves -- 5.8 Calcium Excitability and the FitzHugh-Nagumo Equations -- Part II Specific Models -- 6 Nonexcitable Cells -- 6.1 Xenopus Oocytes -- 6.1.1 A Heuristic Model for Calcium Oscillationsand Waves -- 6.1.2 Mitochondria and Spiral Wave Stability -- 6.1.3 Bistability and the Fertilisation Calcium Wave -- 6.1.4 Increased IP3 Sensitivity During Egg Maturation -- 6.2 Hepatocytes -- 6.2.1 Effect of IP3 Metabolism on Calcium Oscillations -- 6.2.1.1 Simulation Results -- 6.2.1.2 Testing the Model Predictions -- 6.2.2 Deterministic Versus Stochastic Aspects of Calcium Oscillations -- 6.2.3 Phase Waves Coordinate Calcium Spiking Between Connected Hepatocytes -- 6.2.4 Amplitude-Coded Calcium Oscillations in Fish Hepatocytes -- 6.3 Pancreatic and Parotid Acinar Cells -- 6.3.1 Introduction -- 6.3.2 Calcium Oscillations and Waves in Acinar Cells -- 6.3.3 Calcium Waves and Water Secretion -- 6.3.4 Detailed Spatial Structure of an Acinus -- 6.4 Astrocytes -- 6.4.1 Introduction -- 6.4.2 Calcium Oscillations Induced by Stimulation of mGlu5 Receptors -- 6.4.3 Towards Modelling Calcium Oscillationsin Astrocytes -- 7 Muscle -- 7.1 Introduction -- 7.2 Cardiac Myocytes -- 7.2.1 Cardiac Excitation-Contraction Coupling -- 7.2.2 Common-Pool and Local-Control Models -- 7.2.3 Calcium Sparks -- 7.2.4 The Diadic Cleft Can Be Described by a Continuous and Deterministic Model -- 7.2.5 Integrative Models -- 7.2.6 Simplified Approaches -- 7.2.6.1 The Probability Density Approach -- 7.2.7 Atrial Myocytes -- 7.3 Skeletal Myocytes -- 7.4 Smooth Muscle -- 7.4.1 Airway Smooth Muscle -- 7.4.1.1 Stochastic or Deterministic? -- 7.4.1.2 The Cytosolic Oscillator -- 7.4.1.3 The Interplay Between IP3R and RyR -- 7.4.1.4 Periodic Waves in the Model -- 7.4.1.5 More Detailed Treatment of the Membrane Currents. , 7.4.2 Vascular Smooth Muscle -- 7.5 Calcium and the Generation of Force in Smooth Muscle -- 7.5.1 The Hai-Murphy Model -- 7.5.2 Calcium, Calmodulin, and MLCK -- 7.5.3 The Frequency Response of Airway Smooth Muscle -- 8 Neurons and Other Excitable Cells -- 8.1 Introduction -- 8.2 Pre-synaptic Calcium Dynamics -- 8.2.1 Facilitation -- 8.2.2 A Model of the Residual Bound Calcium Hypothesis -- 8.2.3 A More Complex Version -- 8.3 Post-Synaptic Plasticity -- 8.3.1 Calcium/Calmodulin-Dependent Protein Kinase II as a Bistable Switch -- 8.3.2 Phenomenological Models -- 8.3.3 CaMKII as a Frequency Decoder in the Absence of Dephosphorylation -- 8.4 Pancreatic Beta Cells -- 8.4.1 Bursting in the Pancreatic Beta Cell -- 8.4.1.1 Phase-Plane Analysis -- 8.4.2 ER Calcium as a Slow Controlling Variable -- 8.4.3 Other Models -- 8.5 Pancreatic Alpha Cells -- 8.5.1 Electrical Activity of Pancreatic Alpha Cells -- 8.5.2 Calcium Dynamics in Pancreatic Alpha Cells -- 8.6 Calcium-Mediated Secretion -- 8.6.1 Prototypic Model for Calcium-Mediated Secretion -- 8.6.2 Secretion of Insulin by Pancreatic Beta Cells -- 8.6.3 Secretion of Glucagon by Pancreatic Alpha Cells -- 8.7 Hypothalamic and Pituitary Cells -- 8.7.1 The Gonadotroph -- 8.7.1.1 The Membrane Model -- 8.7.1.2 The Calcium Model -- 8.7.1.3 Results -- 8.7.2 GnRH Neurons -- References -- Index.
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  • 2
    Online Resource
    Online Resource
    Princeton :Princeton University Press,
    Keywords: Electronic books.
    Description / Table of Contents: No detailed description available for "Self-Organization in Biological Systems".
    Type of Medium: Online Resource
    Pages: 1 online resource (548 pages)
    Edition: 1st ed.
    ISBN: 9780691212920
    Series Statement: Princeton Studies in Complexity Series ; v.7
    DDC: 570/.1/1
    Language: English
    Note: Cover page -- Half-title page -- Title page -- Copyright page -- Contents -- Explanation of Color Plates -- Prologue: Aims and Scope of the Book -- Part I: Introduction to Biological Self-Organization -- Chapter 1 - What Is Self-Organization? -- Chapter 2 - How Self-OrganizationWorks -- Chapter 3 - Characteristics of Self-Organizing Systems -- Chapter 4 - Alternatives to Self-Organization -- Chapter 5 - Why Self-Organization? -- Chapter 6 - Investigation of Self-Organization -- Chapter 7 - Misconceptions about Self-Organization -- Part II: Case Studies -- Chapter 8 - Pattern Formation in Slime Molds and Bacteria -- Chapter 9 - Feeding Aggregations of Bark Beetles -- Chapter 10 - Synchronized Flashing among Fireflies -- Chapter 11 - Fish Schooling -- Chapter 12 - Nectar Source Selection by Honey Bees -- Chapter 13 - Trail Formation in Ants -- Chapter 14 - The Swarm Raids of Army Ants -- Chapter 15 - Colony Thermoregulation in Honey Bees -- Chapter 16 - Comb Patterns in Honey Bee Colonies -- Chapter 17 - Wall Building by Ants -- Chapter 18 - Termite Mound Building -- Chapter 19 - Construction Algorithms in Wasps -- Chapter 20 - Dominance Hierarchies in Paper Wasps -- Part III: Conclusions -- Chapter 21 - Lessons, Speculations, and the Future of Self-Organization -- Notes -- References -- Index.
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  • 3
    Online Resource
    Online Resource
    Providence :American Mathematical Society,
    Keywords: Physiology -- Mathematical models -- Congresses. ; Cytology -- Mathematical models -- Congresses. ; Immunology -- Mathematical models -- Congresses. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (194 pages)
    Edition: 1st ed.
    ISBN: 9780821892749
    Series Statement: Proceedings of Symposia in Applied Mathematics ; v.59
    DDC: 612/.001/5118
    Language: English
    Note: Intro -- Contents -- Introduction -- Figure and table credits -- Dynamics of singularly perturbed neuronal networks -- Mathematics in visual neuroscience: The retina -- Arrhythmias by dimension -- Calcium excitability -- Disease gene dynamics in a population isolate -- Modeling viral infections -- Index -- A -- B -- C -- D -- E -- F -- G -- H -- I -- L -- M -- N -- O -- P -- R -- S -- T -- V -- W -- X.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of mathematical biology 30 (1992), S. 281-306 
    ISSN: 1432-1416
    Keywords: Insect societies ; Honey bees ; Mathematical model ; Pattern formation ; Self-organisation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract We present a simplified version of a previously presented model (Camazine et al. (1990)) that generates the characteristic pattern of honey, pollen and brood which develops on combs in honey bee colonies. We demonstrate that the formation of a band of pollen surrounding the brood area is dependent on the assumed form of the honey and pollen removal terms, and that a significant pollen band arises as the parameter controlling the rate of pollen input passes through a bifurcation value. The persistence of the pollen band after a temporary increase in pollen input can be predicted from the model. We also determine conditions on the parameters which ensure the accumulation of honey in the periphery and demonstrate that, although there is an important qualitative difference between the simplified and complete models, an analysis of the simplified version helps us understand many biological aspects of the more complex complete model.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Bulletin of mathematical biology 59 (1997), S. 1191-1201 
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Bulletin of mathematical biology 51 (1989), S. 749-784 
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract Phototransduction is a process which links the absorption of photons by a rod or cone to the modulation of voltage across the cell membrane. An important feature of many vertebrate photoreceptors is a mechanism that adjusts the sensitivity and dynamics of the response to light according to the level of illumination. We construct a system of ordinary differential equations that models what are currently thought to be the important molecule mechanisms involved in phototransduction: this includes consideration of both intracellular enzyme kinetics and the properties of light-insensitive and light-sensitive conductances in the cone membrane. The system contains negative feedback whose functional form is determined by constraining the steady-state behaviour of the system. Despite the highly nonlinear nature of the system of ordinary differential equations, our methods permit us to derive an analytic expression for the first-order frequency response parametric in the steady-state value of only one dynamic variable, the light input. Various unknown kinetic parameters are found by fitting the model to experimental data on the first-order frequency response of cones measured at several mean light levels spanning a range of four log units. Good fits are obtained to the data, and the computed shape of the feedback function agrees qualitatively with recent experiment. Moreover, the model accounts for the dramatic speeding up of the response kinetics and the decrease in response gain with increasing light level.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Bulletin of mathematical biology 55 (1993), S. 315-344 
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract We discuss in detail the behaviour of a model, proposed by Goldbeteret al. (1990.Proc. natn. Acad. Sci. 87, 1461–1465), for intracellular calcium wave propagation by calcium-induced calcium release, focusing our attention on excitability and the propagation of waves in one spatial dimension. The model with no diffusion behaves like a generic excitable system, and threshold behaviour, excitability and oscillations can be understood within this general framework. However, when diffusion is included, the model no longer behaves like a generic excitable system; the fast and slow variables are not distinct and previous results on excitable systems do not necessarily apply. We consider a piecewise linear simplification of the model, and construct travelling pulse and periodic plane wave solutions to the simplified model. The analogous behaviour in the full model is studied numerically. Goldbeter's model for calciuminduced calcium release is an excitable system of a type not previously studied in detail.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Behavioral ecology and sociobiology 28 (1991), S. 277-290 
    ISSN: 1432-0762
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A honey bee colony can skillfully choose among nectar sources. It will selectively exploit the most profitable source in an array and will rapidly shift its foraging efforts following changes in the array. How does this colony-level ability emerge from the behavior of individual bees? The answer lies in understanding how bees modulate their colony's rates of recruitment and abandonment for nectar sources in accordance with the profitability of each source. A forager modulates its behavior in relation to nectar source profitability: as profitability increases, the tempo of foraging increases, the intensity of dancing increases, and the probability of abandoning the source decreases. How does a forager assess the profitability of its nectar source? Bees accomplish this without making comparisons among nectar sources. Neither do the foragers compare different nectar sources to determine the relative profitability of any one source, nor do the food storers compare different nectar loads and indicate the relative profitability of each load to the foragers. Instead, each forager knows only about its particular nectar source and independently calculates the absolute profitability of its source. Even though each of a colony's foragers operates with extremely limited information about the colony's food sources, together they will generate a coherent colonylevel response to different food sources in which better ones are heavily exploited and poorer ones are abandoned. This is shown by a computer simulation of nectar-source selection by a colony in which foragers behave as described above. Nectar-source selection by honey bee colonies is a process of natural selection among alternative nectar sources as foragers from more profitable sources “survive” (continue visiting their source) longer and “reproduce” (recruit other foragers) better than do foragers from less profitable sources. Hence this colonial decision-making is based on decentralized control. We suggest that honey bee colonies possess decentralized decision-making because it combines effectiveness with simplicity of communication and computation within a colony.
    Type of Medium: Electronic Resource
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