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Related Concept Videos

Redox Equilibria: Overview01:23

Redox Equilibria: Overview

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A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
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Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
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Redox Reactions01:27

Redox Reactions

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Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...
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Balancing Redox Equations02:58

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Electrochemistry is the science involved in the interconversion of electrical and chemical reactions. Such reactions are called reduction-oxidation, or redox reactions. These important reactions are defined by changes in oxidation states for one or more reactant elements and include a subset of reactions involving the transfer of electrons between reactant species. Electrochemistry as a field has evolved to yield sufficient insights on the fundamental principles of redox chemistry and multiple...
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Ladder Diagrams: Redox Equilibria01:30

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Ladder diagrams are useful tools for understanding redox equilibrium reactions, especially the effects of concentration changes on the electrochemical potential of the reaction. The vertical axis in the redox ladder diagrams represents the electrochemical potential, E. The area of predominance is demarcated using the Nernst equation.
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Redox Titration: Overview01:21

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Redox titration is a chemical analysis technique used to determine the concentration of an unknown substance by measuring the electron transfer in a redox (reduction-oxidation) reaction. The process involves gradually adding a titrant with a known concentration of an oxidizing or reducing agent, to the analyte, the solution with an unknown concentration, until reaching the endpoint, which indicates the completion of the reaction between the two substances. Ensuring the analyte is in a single...
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Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
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Exploring Coupled Redox and pH Processes with a Force-Field-Based Approach: Applications to Five Different Systems.

Vinícius Wilian D Cruzeiro1, Gustavo Troiano Feliciano2, Adrian E Roitberg1

  • 1Department of Chemistry , University of Florida , Gainesville , Florida 32611 , United States.

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Computational molecular dynamics simulations now account for simultaneous pH and redox changes. This enhanced method provides new insights into biological systems, complementing experimental findings with efficient, GPU-accelerated calculations.

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Area of Science:

  • Biochemistry and Molecular Dynamics
  • Computational Chemistry
  • Bioenergetics

Background:

  • Biological systems rely on coupled redox and pH-driven processes.
  • Accurate simulation of protonation and redox states requires efficient computational tools.
  • Previous work introduced constant pH and redox potential molecular dynamics (C(pH,E)MD) and replica exchange for enhanced convergence.

Purpose of the Study:

  • To improve the C(pH,E)MD method for simultaneous pH- and redox-activity in residues.
  • To apply the enhanced methodology to diverse biological systems.
  • To provide computational insights complementing experimental and theoretical studies.

Main Methods:

  • Developed an improved C(pH,E)MD approach enabling simultaneous pH and redox activity.
  • Employed multidimensional replica exchange to enhance simulation convergence.
  • Utilized a fully force-field-based and GPU-accelerated computational framework.

Main Results:

  • Studied five systems: capped tyrosine dipeptide, maquette systems (α3Y, peptide A), and two heme-containing proteins (cytochrome c3).
  • Generated simulation results offering new insights into these systems.
  • Demonstrated high computational performance through GPU acceleration.

Conclusions:

  • The enhanced C(pH,E)MD method effectively simulates systems with coupled pH and redox activity.
  • The approach provides valuable computational data to support and guide experimental research.
  • GPU acceleration ensures efficient execution of complex molecular dynamics simulations.