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Related Concept Videos

Transition State Theory01:25

Transition State Theory

Transition-state theory, also known as activated-complex theory, provides a molecular-level explanation of reaction rates in both gas-phase and solution-phase reactions. It extends earlier kinetic models by considering the formation of a short-lived, high-energy configuration during a reaction.The progress of a chemical reaction can be represented using a reaction profile, which plots potential energy against the reaction coordinate. As two reactant molecules approach one another, their...
Entropy Change in Reversible Processes01:10

Entropy Change in Reversible Processes

In the Carnot engine, which achieves the maximum efficiency between two reservoirs of fixed temperatures, the total change in entropy is zero. The observation can be generalized by considering any reversible cyclic process consisting of many Carnot cycles. Thus, it can be stated that the total entropy change of any ideal reversible cycle is zero.
The statement can be further generalized to prove that entropy is a state function. Take a cyclic process between any two points on a p-V diagram.
The Entropy as a State Function01:14

The Entropy as a State Function

Consider an arbitrary process that moves between two specific states (A and B) in a cyclic manner. This process is reversible and broken down into smaller parts that each follow a Carnot cycle. A Carnot cycle has two isothermal (constant temperature) processes. During these processes, the ratio of the amount of heat transferred to their respective temperature remains constant. The other two processes in the Carnot cycle are also reversible but adiabatic, which means they occur without any heat...
Dynamic Equilibrium02:20

Dynamic Equilibrium

A reversible chemical reaction represents a chemical process that proceeds in both forward (left to right) and reverse (right to left) directions. When the rates of the forward and reverse reactions are equal, the concentrations of the reactant and product species remain constant over time and the system is at equilibrium. A special double arrow is used to emphasize the reversible nature of the reaction. The relative concentrations of reactants and products in equilibrium systems vary greatly;...
Free Energy Changes for Nonstandard States03:25

Free Energy Changes for Nonstandard States

The free energy change for a process taking place with reactants and products present under nonstandard conditions (pressures other than 1 bar; concentrations other than 1 M) is related to the standard free energy change according to this equation:
Reaction Mechanisms: The Steady-State Approximation01:26

Reaction Mechanisms: The Steady-State Approximation

The steady-state approximation, also referred to as the quasi-steady-state approximation to differentiate it from a true steady state, is a widely used method for simplifying calculations in complex reaction mechanisms. This approach is particularly useful when dealing with multi-step reactions that involve reverse reactions or several steps, which can significantly increase mathematical complexity and make the reactions nearly unsolvable analytically.The steady-state approximation operates on...

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Related Experiment Video

Updated: May 18, 2026

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
06:55

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level

Published on: September 26, 2016

Characterizing topological transitions in a Turing-pattern-forming reaction-diffusion system.

Jacobo Guiu-Souto1, Jorge Carballido-Landeira, Alberto P Muñuzuri

  • 1Group of Nonlinear Physics, Department of Physics, University of Santiago de Compostela, Spain. jacobo.guiu@usc.es

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|September 26, 2012
PubMed
Summary
This summary is machine-generated.

We introduce a new parameter to distinguish between different Turing patterns, overcoming limitations of traditional Fourier analysis. This method successfully identifies spatial configurations in reaction-diffusion systems and evolving patterns.

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Area of Science:

  • * Pattern formation in reaction-diffusion systems.
  • * Mathematical modeling of biological and chemical systems.
  • * Nonlinear dynamics and spatial pattern analysis.

Background:

  • * Turing structures, including stripes and spots, arise naturally in various systems.
  • * Fourier transformation is a common tool for analyzing spatial patterns but cannot differentiate configurations.
  • * Existing methods struggle to distinguish between different spatial arrangements and mixed states of Turing patterns.

Purpose of the Study:

  • * To develop a novel parameter for differentiating spatial configurations of Turing structures.
  • * To address the limitations of Fourier transformation in characterizing complex patterns.
  • * To provide a robust method for analyzing pattern transitions and temporal evolution.

Main Methods:

  • * Development of a new quantitative parameter to characterize spatial configurations.
  • * Application of the parameter to a reaction-diffusion system with external forcing.
  • * Validation of the method on temporally evolving patterns.

Main Results:

  • * The proposed parameter effectively distinguishes between different spatial configurations (stripes, spots, mixed states).
  • * The method accurately characterizes pattern transitions induced by external forcing.
  • * Successful application to temporally evolving Turing patterns, demonstrating versatility.

Conclusions:

  • * The new parameter offers a clear and effective way to differentiate Turing structure configurations.
  • * This advancement overcomes limitations of traditional Fourier analysis for pattern characterization.
  • * The method is broadly applicable to reaction-diffusion systems and other pattern-forming systems.