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Related Concept Videos

SN2 Reaction: Kinetics

S_N2 Reaction: Kinetics

Kinetic Studies and Significance
In a chemical reaction, a relationship exists between the concentration of reactants and the rate at which the reaction proceeds. The study to measure this relationship is known as the kinetics of a chemical reaction. Kinetic studies are used to deduce the rate law of a chemical reaction, which provides information about the species involved during the transition state of the rate-determining step. Thus, kinetic studies help to derive the mechanism of a...

SN2 Reaction: Mechanism

S_N2 Reaction: Mechanism

The kinetic studies of SN2 reactions suggest an essential feature of its mechanism: it is a single-step process without intermediates. Here, both the nucleophile and the substrate participate in the rate-determining step.
The presence of the more electronegative halogen in the substrate creates a polarized carbon-halide bond. The halide pulls the electron cloud generating an electrophilic center at the carbon atom. Thus, the carbon atom carries a partial positive charge while the halide has a...

SN2 Reaction: Transition State

S_N2 Reaction: Transition State

An SN2 reaction of an alkyl halide is a single-step process in which bond formation between the nucleophile and the substrate and bond breaking between the substrate and the halide occurs simultaneously through a transition state without forming an intermediate.
When the nucleophile approaches the electrophilic carbon with its lone pairs, the halide acts as a leaving group and moves away with the electron-pair bonded to the carbon. Dotted partial bonds represent the bonds being formed or broken...

SN2 Reaction: Stereochemistry

S_N2 Reaction: Stereochemistry

In an SN2 reaction, the nucleophilic attack on the substrate and departure of the leaving group occurs simultaneously through a transition state. As the nucleophile approaches the substrate from the back-side, the configuration of the substrate carbon changes from tetrahedral to trigonal bipyramidal and then back to tetrahedral, leading to an inversion in the configuration of the product.
If the substrate is an achiral molecule at the α-carbon, the inversion of configuration is not...

2° Amines to N-Nitrosamines: Reaction with NaNO2

2° Amines to N-Nitrosamines: Reaction with NaNO₂

Secondary amines react with nitrous acid to form N-nitrosamines, as depicted in Figure 1. Nitrous acid, a weak and unstable acid, is formed in situ from an aqueous solution of sodium nitrite and strong acids, such as hydrochloric acid or sulfuric acid, in cold conditions. In the presence of an acid, the nitrous acid gets protonated. The subsequent loss of water results in the formation of the electrophile known as nitrosonium ion.

The Nucleosome Core Particle

The Nucleosome Core Particle

Nucleosomes are the DNA-histone complex, where the DNA strand is wound around the histone core. The histone core is an octamer containing two copies of H2A, H2B, H3, and H4 histone proteins.
The paradox
Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their main responsibility is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. While on the other hand, they must allow polymerase enzymes to access DNA...

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Related Experiment Video

Updated: Jan 28, 2026

Dynamic Pore-scale Reservoir-condition Imaging of Reaction in Carbonates Using Synchrotron Fast Tomography

Dynamic Pore-scale Reservoir-condition Imaging of Reaction in Carbonates Using Synchrotron Fast Tomography

Published on: February 21, 2017

ReaDDy 2: Fast and flexible software framework for interacting-particle reaction dynamics.

Moritz Hoffmann¹, Christoph Fröhner¹, Frank Noé¹

¹Department of Mathematics and Computer Science, Freie Universität Berlin, Berlin, Germany.

Plos Computational Biology

|March 1, 2019

Summary

Interacting-particle reaction dynamics (iPRD) simulations, now enhanced with ReaDDy 2 software, model complex chemical reactions in crowded environments. This tool simulates particle behavior, reactions, and kinetics for detailed spatiotemporal analysis.

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Dynamic Pore-scale Reservoir-condition Imaging of Reaction in Carbonates Using Synchrotron Fast Tomography

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Area of Science:

Computational Chemistry
Biophysics
Chemical Engineering

Background:

Simulating complex reaction kinetics in dense environments, like cellular membranes or microreactors, is challenging.
Existing methods often struggle with intricate molecular geometries and reaction mechanisms, such as polymer dynamics.

Purpose of the Study:

Introduce ReaDDy 2, a new software for Interacting-particle reaction dynamics (iPRD) simulations.
Provide a user-friendly Python interface for defining simulation parameters, particle interactions, and reaction rules.
Develop a flexible and efficient simulation framework capable of handling complex reaction mechanisms.

Main Methods:

ReaDDy 2 combines molecular dynamics (MD) principles with reaction kinetics.
Utilizes a Python interface for defining simulation environments, particle interactions, and reaction rules.
Employs hardware-specific simulation kernels (CPU, with future GPU/multi-node support) for computational efficiency.

Main Results:

ReaDDy 2 enables convenient definition and execution of iPRD simulations.
The software architecture supports efficient computation through specialized kernels.
Demonstrated efficiency and validity using benchmark examples.

Conclusions:

ReaDDy 2 provides a powerful and accessible tool for simulating complex reaction dynamics.
Facilitates detailed spatiotemporal analysis in crowded and complex biological or chemical systems.
The software's architecture is designed for future scalability and performance enhancements.