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Related Concept Videos

Reaction Mechanisms03:06

Reaction Mechanisms

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Chemical reactions often occur in a stepwise fashion, involving two or more distinct reactions taking place in a sequence. A balanced equation indicates the reacting species and the product species, but it reveals no details about how the reaction occurs at the molecular level. The reaction mechanism (or reaction path) provides details regarding the precise, step-by-step process by which a reaction occurs.
For instance, the decomposition of ozone appears to follow a mechanism with two steps:
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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.
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SNAREs and Membrane Fusion01:43

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Once a transport vesicle has recognized its target organelle, the vesicular membrane needs to fuse with the target membrane to unload the cargo. Transmembrane proteins called SNAREs present on organelle membranes and their vesicles, mediate vesicle fusion.
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Coupled Reactions01:17

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Cellular processes such as building and breaking down complex molecules occur through stepwise chemical reactions. Some of these chemical reactions are spontaneous and release energy, whereas others require energy to proceed. Cells often couple the energy-releasing reaction with the energy-requiring one to carry out important cell functions. 
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Introduction to Chemical Reactions01:23

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All chemical reactions begin with a reactant, the general term for one or more substances entering the reaction. Sodium and chloride ions, for example, are the reactants in the production of table salt. One or more substances produced by a chemical reaction are called the product. Chemical reactions follow the law of conservation of mass, which means that matter cannot be created nor destroyed in a chemical reaction. The components of the reactants—the number of atoms and the...
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Standard Entropy Change for a Reaction03:00

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Entropy is a state function, so the standard entropy change for a chemical reaction (ΔS°rxn) can be calculated from the difference in standard entropy between the products and the reactants.
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Updated: Jun 23, 2025

Author Spotlight: Tackling Challenges in Synthetic Cell Engineering
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A Chemical Reaction Network Drives Complex Population Dynamics in Oscillating Self-Reproducing Vesicles.

Zhiheng Zhang1, Michael G Howlett1, Emma Silvester2,3

  • 1Chemistry Research Laboratory, Department of Chemistry, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, U.K.

Journal of the American Chemical Society
|June 25, 2024
PubMed
Summary
This summary is machine-generated.

Chemically fueled vesicle oscillations were observed, driven by self-reproduction and collapse in a biphasic network. This dynamic behavior mimics cellular reproductive cycles, offering insights into chemical systems.

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Area of Science:

  • Chemical kinetics
  • Supramolecular chemistry
  • Biophysics

Background:

  • Vesicles are crucial in biological systems.
  • Understanding self-reproducing chemical systems is a key challenge.

Purpose of the Study:

  • To investigate chemically fueled oscillations in vesicle populations.
  • To explore the molecular and supramolecular mechanisms driving these oscillations.

Main Methods:

  • Utilized interferometric scattering microscopy to track vesicle populations.
  • Employed dynamic light scattering for temporal analysis.
  • Studied oscillations on both molecular and supramolecular scales.

Main Results:

  • Observed chemically fueled oscillations in vesicle populations.
  • Documented vesicle self-reproduction, growth, and decomposition during oscillations.
  • Noted variations in aggregate number, size, and mass between and within oscillation pulses.

Conclusions:

  • The studied vesicle system exhibits dynamic behavior analogous to cellular reproduction.
  • Biphasic reaction networks can drive complex population cycling in chemical systems.
  • This research provides a model for understanding emergent behaviors in non-living chemical matter.