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Related Concept Videos

Chain Reactions01:29

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...
Radical Chain-Growth Polymerization: Overview01:10

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...
Radical Chain-Growth Polymerization: Chain Branching01:17

Radical Chain-Growth Polymerization: Chain Branching

The skeletal structure of polymers synthesized via radical polymerization is always branched. For example, the polymerization of ethylene by radical polymerization results in a low-density grade of polyethylene with a heavily branched skeletal structure. Here, the radical site abstracts hydrogen from the growing chain, and the radical site shifts from the end (a primary carbon center) to anywhere within the growing chain (a secondary carbon center). Consequently, the part of the chain from the...
Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this species into the...
Cationic Chain-Growth Polymerization: Mechanism00:57

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: Mechanism01:04

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.

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Patterned Photostimulation with Digital Micromirror Devices to Investigate Dendritic Integration Across Branch Points
09:30

Patterned Photostimulation with Digital Micromirror Devices to Investigate Dendritic Integration Across Branch Points

Published on: March 2, 2011

Dendritic chain reaction.

Eran Sella1, Doron Shabat

  • 1School of Chemistry, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel-Aviv University, Tel Aviv 69978, Israel.

Journal of the American Chemical Society
|July 3, 2009
PubMed
Summary
This summary is machine-generated.

This study introduces a novel, non-PCR-based dendritic chain reaction (DCR) for exponential signal amplification in aqueous environments. This method enhances diagnostic sensitivity by generating a strong signal from a single analyte molecule.

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Area of Science:

  • Biochemistry
  • Analytical Chemistry
  • Molecular Diagnostics

Background:

  • Signal amplification is crucial for improving analyte detection sensitivity in diagnostics.
  • Existing methods often rely on Polymerase Chain Reaction (PCR) or require non-aqueous conditions.
  • There is a need for sensitive, PCR-free amplification techniques in aqueous environments.

Purpose of the Study:

  • To develop a novel, non-PCR-based modular technique for exponential signal amplification.
  • To demonstrate signal amplification in an aqueous environment.
  • To assess the sensitivity of the technique for diagnostic purposes.

Main Methods:

  • Development of a dendritic chain reaction (DCR) based on the disassembly of self-immolative dendrimers.
  • Release of chromogenic molecules upon dendrimer disassembly to generate a detectable signal.
  • Coupling the DCR technique with a protease diagnostic probe.

Main Results:

  • The DCR technique enables exponential amplification of diagnostic signals under aqueous conditions.
  • A single analyte molecule can initiate the DCR, leading to a strong signal.
  • High sensitivity was achieved in detecting the activity of penicillin-G-amidase using the DCR method.

Conclusions:

  • The developed DCR technique offers a novel approach for sensitive, PCR-free signal amplification.
  • This method is suitable for diagnostic applications in aqueous environments.
  • The technique represents a significant advancement in non-PCR-based diagnostic signal amplification.