autocatalysis

/,ɔ:toukə'tælisis/

Thân thiện

A chemical reaction demonstrates autocatalysis as its product accelerates the process.

Definition

1. Noun:
   • A chemical process in which a reaction product itself acts as a catalyst for the same reaction: Autocatalysis describes a specific type of catalysis where one of the substances produced by the reaction accelerates the rate of the reaction itself, leading to a self-accelerating process.

Usage

• Autocatalysis is a fundamental concept in chemistry and biochemistry. It explains how certain reactions can start slowly and then rapidly increase in speed as the catalytic product accumulates.
• It is often discussed in contexts like reaction kinetics, the origin of life (e.g., self-replicating molecules), and systems chemistry.

Examples

• Noun:
  • The hydrolysis of ethyl acetate is a classic example of autocatalysis, where the acetic acid produced catalyzes further reaction.
  • Researchers studied the autocatalysis in the formose reaction to understand prebiotic chemistry.
  • The reaction exhibited autocatalysis, so its rate increased dramatically over time.

Advanced Usage

• Mathematical modeling: Autocatalysis is often modeled using differential equations (e.g., logistic growth equations) to describe the non-linear increase in reaction rate.
  • The model incorporated autocatalysis to accurately predict the system's explosive growth phase.
• Systems-level behavior: In complex systems, autocatalysis can lead to phenomena like bistability, oscillations, and pattern formation.
  • The network's sustained oscillations were driven by a core cycle of autocatalysis.

Variants and Related Words

• Autocatalytic (adj): Exhibiting or involving autocatalysis.
  • The process follows an autocatalytic pathway.
• Autocatalyst (n): A less common term for the substance that acts as the catalyst in an autocatalytic reaction.
• Cross-catalysis (n): A related process where the product of one reaction catalyzes a different reaction, often in a cyclic network.

Synonyms

• Self-catalysis: (A direct synonym, though less commonly used than "autocatalysis").
• Autoactivation: (Used in some biochemical contexts for processes where a product activates its own production, closely related but not always identical).

Related Concepts (Not Phrasal Verbs or Idioms)

• Positive feedback loop: A broader systems concept of which autocatalysis is a specific chemical/kinetic example.
• Chain reaction: A reaction where intermediates cause subsequent steps; some chain reactions can be autocatalytic.
• Reaction kinetics: The study of reaction rates, within which autocatalysis is a key mechanism.

Học thuật

Noun

1. catalysis in which the catalyst is one of the products of the reaction