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Related Concept Videos

The Electrical Double Layer01:30

The Electrical Double Layer

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In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
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The Debye–Hückel Theory of Electrolyte Solutions01:27

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The Debye–Hückel theory, established by Peter Debye and Erich Hückel in 1923, is a fundamental concept in physical chemistry. It provides an understanding of the behavior of strong electrolytes in solution, particularly explaining their deviations from ideal behavior.The theory is based on Coulombic interactions (the attraction or repulsion between charged particles) between ions in solution. In an ionic solution, oppositely charged ions tend to attract each other. This means...
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Imagine a bucket of water. It contains many molecules, of the order of 1026 molecules. Thus, although it contains discrete elements (molecules) at the microscopic level, macroscopically, it can be considered continuous. Small volume elements of water, infinitesimal compared to the bulk of the bucket's volume, still contain many molecules. Under this framework, quantized matter is approximated as continuous for practical purposes.
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Potential Due to a Polarized Object01:29

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A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
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Theory of Strong Electrolytes01:23

Theory of Strong Electrolytes

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The interionic forces of the strong electrolytes depend on the solvent's dielectric constant, which is the ability of a solvent to store electrical energy, based on its polarizability. and the solution's concentration. In high-dielectric solvents and in dilute solutions, weak electrostatic forces keep ions apart. However, in low-dielectric solvents or concentrated solutions, stronger interionic forces may cause ions to pair up as ionic doublets despite being fully ionized. The theory of strong...
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Electric Dipoles and Dipole Moment01:30

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Consider two charges of equal magnitude but opposite signs. If they cannot be separated by an external electric field, the system is called a permanent dipole. For example, the water molecule is a dipole, making it a good solvent.
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Finite Element Modelling of a Cellular Electric Microenvironment
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A simple model for electrical charge in globular macromolecules and linear polyelectrolytes in solution.

M Krishnan1

  • 1Department of Chemistry, University of Zurich, Winterthurerstrasse 190, CH 8057 Zurich, Switzerland and Department of Physics, University of Zurich, Winterthurerstrasse 190, CH 8057 Zurich, Switzerland.

The Journal of Chemical Physics
|June 3, 2017
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Summary

This study introduces a model to calculate the electrical charge of biomolecules like proteins and DNA. It accurately predicts molecular charge and interactions in solution, linking structure, charge, and electrostatics.

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Area of Science:

  • Biophysics
  • Computational Biology
  • Physical Chemistry

Background:

  • Understanding biomolecular electrostatics is crucial for molecular interactions.
  • Charge regulation and renormalization phenomena influence biomolecule behavior in solution.
  • Accurate prediction of molecular charge is essential for various biological processes.

Purpose of the Study:

  • To develop a model for calculating the net and effective electrical charge of macromolecules.
  • To simultaneously address charge regulation and renormalization in biomolecules.
  • To provide a framework linking molecular structure, charge, and electrostatic interactions.

Main Methods:

  • Numerical solution of the non-linear Poisson-Boltzmann equation.
  • Finite element discretized continuum approach.
  • Incorporation of acid-base equilibria and local electrical potential calculations.

Main Results:

  • The model accurately predicts the "interaction charge" and "effective charge" of molecules.
  • Predictions align with experimental measurements for nucleic acids and disordered proteins.
  • Model captures pKa shifts in globular proteins with an adjustable dielectric constant.

Conclusions:

  • The model offers a straightforward framework for biomolecular electrostatics.
  • It bridges theory and experiment, aiding understanding of structure-charge-interaction relationships.
  • Useful for predicting electrostatics when crystal structures are unavailable.