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• W2070932504 abstract "Computation of living processes creates great promise for the everyday life of mankind and great challenges for physical scientists. Simulations of molecular dynamics have great appeal to biologists as a natural extension of structural biology. Once a biologist sees a structure, she/he wants to see it move. Molecular biology has shown that a small number of atoms, sometimes even one messenger ion, like Ca2+, can control biological function on the scale of cells, organs, tissues, and organisms. Enormously concentrated ions, at number densities of ∼20 M, in protein channels and enzymes are responsible for many of the characteristics of living systems, just as highly concentrated ions near electrodes are responsible for many of the characteristics of electrochemical systems. Here we confront the reality of the scale differences of ions. We show that the scale differences needed to simulate all the atoms of biological cells are 107 in linear dimension, 1021 in three dimensions, 109 in resolution, 1011 in time, and 1013 in particle number (to deal with concentrations of Ca2+). These scales must be dealt with simultaneously if the simulation is to deal with most biological functions. Biological function extends across all of them, all at once in most cases. We suggest a computational approach using explicit multiscale analysis instead of implicit simulation of all scales. The approach is based on an energy variational principle EnVarA introduced by Chun Liu to deal with complex fluids. Variational methods deal automatically with multiple interacting components and scales. When an additional component is added to the system, the resulting Euler−Lagrange field equations change form automatically, by algebra alone, without additional unknown parameters. Multifaceted interactions are solutions of the resulting equations. We suggest that ionic solutions should be viewed as complex fluids with simple components. Highly concentrated solutions, dominated by interactions of components, are easily computed by EnVarA. Successful computation of ions concentrated in special places may be a significant step to understanding the defining characteristics of biological and electrochemical systems. Indeed, computing ions near proteins and nucleic acids may prove as important to molecular biology and chemical technology as computing holes and electrons has been to our semiconductor and digital technology." @default.
• W2070932504 created "2016-06-24" @default.
• W2070932504 creator A5091003144 @default.
• W2070932504 date "2010-10-21" @default.
• W2070932504 modified "2023-10-17" @default.
• W2070932504 title "Multiple Scales in the Simulation of Ion Channels and Proteins" @default.
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• W2070932504 doi "https://doi.org/10.1021/jp106760t" @default.
• W2070932504 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2996618" @default.
• W2070932504 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/21135913" @default.
• W2070932504 hasPublicationYear "2010" @default.
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