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Chain Reactions

Chain Reactions

Chain reactions involve highly reactive transient species, such as atoms or free radicals, as intermediates. These intermediates facilitate rapid reactions over an extended period. The process includes a series of steps: a reactive intermediate is consumed, reactants are converted to products, and the intermediate is regenerated. This cycle enables continuous repetition, amplifying the production of products with a small amount of intermediate. Chain reactions often utilize free radicals as...

Cationic Chain-Growth Polymerization: Mechanism

Cationic Chain-Growth Polymerization: Mechanism

The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the generated carbocation,...

Anionic Chain-Growth Polymerization: Mechanism

Anionic Chain-Growth Polymerization: Mechanism

The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael acceptor.

Chemical Synapses

Chemical Synapses

Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...

Chemical Synapses

Chemical Synapses

Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...

Radical Chain-Growth Polymerization: Overview

Radical Chain-Growth Polymerization: Overview

Chain-growth or addition polymerization is successive addition reactions of monomers with a polymer chain. In radical chain-growth polymerization, the reaction proceeds via a free-radical intermediate. The free radical is formed from radical initiators, which spontaneously generate free radicals by homolytic fission. Organic peroxides (such as dibenzoyl peroxide, as shown in Figure 1) or azo compounds are popular radical initiators. A low concentration ratio of radical initiator to monomer is...

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Related Experiment Video

Updated: Jun 15, 2026

3D Modeling of Dendritic Spines with Synaptic Plasticity

3D Modeling of Dendritic Spines with Synaptic Plasticity

Published on: May 18, 2020

Two-component dendritic chain reactions: experiment and theory.

Eran Sella¹, Ariel Lubelski, Joseph Klafter

¹Department of Organic Chemistry, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Ramat Aviv, Tel Aviv 69978, Israel.

Journal of the American Chemical Society

|March 3, 2010

Summary

This summary is machine-generated.

A novel two-component dendritic chain reaction offers exponential signal amplification for enhanced diagnostic sensitivity. This new method significantly improves detection of analytes like hydrogen peroxide.

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Area of Science:

Analytical Chemistry
Biochemistry
Nanotechnology

Background:

Improving the sensitivity of diagnostic techniques is crucial for early disease detection and monitoring.
Signal-amplification mechanisms offer a promising route to enhance the detection limits of various analytes.

Purpose of the Study:

To develop a novel two-component dendritic chain reaction for exponential signal amplification.
To demonstrate the system's efficacy in detecting hydrogen peroxide with improved sensitivity.
To create a mathematical model for simulating reaction kinetics.

Main Methods:

Development of a two-component dendritic chain reaction system.
Utilizing the chain reaction to generate the analyte of interest, initiating further diagnostic cycles.
Experimental validation and comparison with classic probe methods.
Mathematical modeling of one-component and two-component reaction disassembly kinetics.

Main Results:

Achieved exponential amplification of the diagnostic signal.
Demonstrated significantly higher signal intensity for hydrogen peroxide detection compared to classic probes.
Developed a mathematical model that accurately correlates with experimental data for reaction kinetics.

Conclusions:

The developed two-component dendritic chain reaction system provides a powerful tool for highly sensitive analyte detection.
The system's modularity and flexibility allow for adaptation to detect a wider range of analytes.
Mathematical modeling aids in understanding and optimizing the reaction dynamics.