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Related Concept Videos

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The free energy change for a reaction that occurs under the standard conditions of 1 bar pressure and at 298 K is called the standard free energy change. Since free energy is a state function, its value depends only on the conditions of the initial and final states of the system. A convenient and common approach to the calculation of free energy changes for physical and chemical reactions is by use of widely available compilations of standard state thermodynamic data. One method involves the...
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Force can be calculated from the expression for potential energy, which is a function of position. The component of a conservative force, in a particular direction, equals the negative of the derivative of the corresponding potential energy with respect to the displacement in that direction. For regions where potential energy changes rapidly with displacement, the work done and force is maximum. Also, when force is applied along the positive coordinate axis, the potential energy decreases with...
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When an object is acted upon by a variable force, the amount of work done and the change in energy of the object can be more complex to calculate compared to when a constant force is applied. Work is the product of force and displacement, while energy is the capacity of a system to do work. When a constant force is applied to an object, the work done can be calculated as the product of the force and the distance moved in the direction of the force. However, when a variable force is applied, the...
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Calculating Free-Energy Differences Using an Average Force: A Tutorial for Adaptive Biasing Force Simulations.

Radu A Talmazan1, Haohao Fu2, Mengchen Zhou2

  • 1Laboratoire International Associé Centre National de la Recherche Scientifique et University of Illinois at Urbana-Champaign, Unité Mixte de Recherche no7019, Université de Lorraine, Vandœ uvre-lès-Nancy, Cedex 54506, France.

The Journal of Physical Chemistry. B
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Summary
This summary is machine-generated.

This tutorial demonstrates calculating free-energy changes using adaptive biasing force algorithms. Applications include ion pairing, peptide folding, and molecular transfer, providing insights into chemical processes.

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Area of Science:

  • Computational Chemistry
  • Physical Chemistry
  • Biophysics

Background:

  • Free-energy calculations are crucial for understanding molecular processes.
  • Adaptive biasing force (ABF) algorithms offer a powerful approach for exploring free-energy landscapes.
  • Reaction-coordinate (RC) models simplify complex molecular systems.

Purpose of the Study:

  • To familiarize readers with calculating free-energy changes along a reaction-coordinate (RC) model.
  • To showcase applications of importance-sampling adaptive biasing force (ABF) algorithms.
  • To provide a practical guide for computational chemists and biophysicists.

Main Methods:

  • Importance-sampling adaptive biasing force (ABF) algorithm variants.
  • Reaction-coordinate (RC) modeling.
  • Collective variable definition for conformational analysis.
  • Free-energy perturbation (FEP) calculations for comparison.

Main Results:

  • Demonstrated calculation of free-energy change for sodium-chloride ion pairing in water.
  • Mapped the conformational free-energy landscape of deca-alanine using alternative collective variables.
  • Estimated ethanol hydration free energy across the water liquid-vapor interface.
  • Determined the 2D Ramachandran free-energy surface for N-methyl-N'-acetylalanylamide.

Conclusions:

  • The ABF algorithm is versatile for diverse free-energy calculations.
  • Comparison with FEP validates the accuracy of the ABF approach.
  • The study provides a comprehensive tutorial for applying advanced computational methods to chemical and biological systems.