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Force On A Current Loop In A Magnetic Field01:17

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Magnetic forces on wires carrying current are most frequently applied in motors. A DC motor is a device that converts electrical energy into mechanical work. In motors, wire loops are enclosed in a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate. The direction of the current is reversed once the loop's surface area is lined up with the magnetic field, causing a constant torque on the loop. During the process, commutators...
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Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
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Electricity is generated by either electrons or ions flowing through a solution or a conducting medium. This flow of electrons or specifically electrical charge is defined as an electric current. When electrons move through a wire, they generate an electric current. It can be recalled  that in a redox reaction, electrons are lost and gained. In the spontaneous redox reaction of zinc  with copper, when zinc is immersed in a copper ion solution, a transfer of electrons from one substance to...
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Force Spectroscopy of Single Protein Molecules Using an Atomic Force Microscope
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Force Fields for Small Molecules.

Fang-Yu Lin1, Alexander D MacKerell2

  • 1Department of Pharmaceutical Sciences, Computer-Aided Drug Design Center, School of Pharmacy, University of Maryland, Baltimore, MD, USA.

Methods in Molecular Biology (Clifton, N.J.)
|August 10, 2019
PubMed
Summary
This summary is machine-generated.

Developing polarizable force fields improves molecular dynamics (MD) simulations for drug design. These models, unlike nonpolarizable ones, better represent molecular interactions and properties, enhancing accuracy in computer-aided drug design (CADD).

Keywords:
Additive force fieldCHARMMComputer-aided drug designDrude oscillator modelMolecular dynamics simulationsPolarizable force field

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Area of Science:

  • Computational Chemistry
  • Molecular Modeling
  • Drug Design

Background:

  • Molecular dynamics (MD) simulations are vital in computer-aided drug design (CADD).
  • The accuracy of MD simulations heavily relies on the chosen force field, especially for small molecules.
  • Existing nonpolarizable force fields have limitations, lacking electronic polarization response, which is crucial for accurate simulations.

Purpose of the Study:

  • To explore the development and importance of polarizable force fields for small molecules.
  • To highlight the advantages of polarizable models over traditional nonpolarizable force fields in CADD.
  • To discuss the application of polarizable force fields in biological systems.

Main Methods:

  • Focus on the evolution of small molecule force fields from additive to polarizable models.
  • Detailed examination of the CHARMM General Force Field (CGenFF) as an additive model.
  • In-depth analysis of the classical Drude oscillator model for polarizable force fields.

Main Results:

  • Polarizable force fields provide a more accurate physical representation of intermolecular interactions.
  • The Drude oscillator model demonstrates significant improvements over additive models for small molecules.
  • Polarizable force fields show better agreement with experimental properties compared to nonpolarizable force fields.

Conclusions:

  • Incorporating polarization effects is a critical advancement for molecular force fields.
  • Polarizable force fields enhance the accuracy and reliability of MD simulations in CADD.
  • These advanced models hold significant potential for diverse biological applications and drug discovery.