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Related Concept Videos

Cycloaddition Reactions: Overview01:16

Cycloaddition Reactions: Overview

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Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.
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Synthetic Biology02:55

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Synthetic biology is an interdisciplinary science that involves using principles from disciplines such as engineering, molecular biology, cell biology, and systems biology. It involves remodeling existing organisms from nature or constructing completely new synthetic organisms for applications such as protein or enzyme production, bioremediation, value-added macromolecule production, and the addition of desirable traits to crops, to name a few.
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Pericyclic Reactions: Introduction01:17

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Pericyclic reactions are organic reactions that occur via a concerted mechanism without generating any intermediates. The reactions proceed through the movement of electrons in a closed loop to form a cyclic transition state, where rearrangement of the σ and π bonds yields specific products.
Pericyclic reactions can be classified into three categories: electrocyclic reactions, cycloaddition reactions, and sigmatropic rearrangements. Electrocyclic reactions and sigmatropic...
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Radical Chain-Growth Polymerization: Overview01:10

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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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ATP and Macromolecule Synthesis01:28

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Biological macromolecules are organic compounds, predominantly composed of carbon atoms. The carbon atoms are covalently bonded with hydrogen, oxygen, nitrogen, and other minor elements. There are four major biological macromolecule classes: carbohydrates, lipids, proteins, and nucleic acids.
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Ziegler–Natta Chain-Growth Polymerization: Overview01:17

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Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
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Updated: Sep 9, 2025

Stable DNA Motifs, 1D and 2D Nanostructures Constructed from Small Circular DNA Molecules
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CircRNA Synthesis and Applications.

Adam Greasley1,2, Shuailong Li1,3, KeXiang Liu3

  • 1Department of Pathology and Laboratory Medicine, Western University, London, ON, Canada.

Advances in Experimental Medicine and Biology
|August 31, 2025
PubMed
Summary
This summary is machine-generated.

Generating pure circular RNA (circRNA) is crucial for research and clinical applications. This chapter summarizes various in vitro and in vivo synthesis methods, detailing their advantages and limitations for optimal circRNA production.

Keywords:
Enzymatic ligationIn vitro transcriptionPermuted intron–exoncircRNA vector

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • RNA Therapeutics

Background:

  • Circular RNA (circRNA) research is rapidly expanding, driving demand for efficient circRNA generation.
  • Existing methods for circRNA synthesis include in vitro chemical ligation, in vitro enzymatic synthesis, and in vivo vector-based systems.
  • Each method presents unique benefits and drawbacks influencing its suitability for specific applications.

Purpose of the Study:

  • To explore and summarize diverse methods for generating pure circular RNA constructs.
  • To provide guidance on selecting the most appropriate circRNA synthesis strategy based on application needs.
  • To highlight key considerations for optimizing circRNA yield and purity.

Main Methods:

  • In vitro chemical ligation techniques.
  • In vitro enzymatic synthesis approaches.
  • In vivo vector-based systems for circRNA production.

Main Results:

  • Detailed comparison of different circRNA synthesis methodologies.
  • Identification of critical factors influencing circRNA yield and purity.
  • Evaluation of method-specific functionalities for various research and clinical uses.

Conclusions:

  • Understanding the nuances of each circRNA synthesis method is vital for successful application.
  • Selection of an appropriate method ensures high-purity circRNA suitable for research and clinical settings.
  • This chapter offers a comprehensive overview to guide researchers in synthesizing and utilizing circRNA effectively.