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Related Concept Videos

Catalysis01:27

Catalysis

Catalysis influences the rate of chemical reactions by providing an alternative reaction pathway with lower activation energy. A catalyst speeds up a reaction, but it is not consumed during the process. The fundamental principle of catalysis is the ability of a catalyst to alter the reaction mechanism, often introducing a more efficient pathway than the uncatalyzed process.In a catalyzed reaction, the catalyst participates directly in the reaction mechanism. It interacts with reactants to form...
Catalysis02:50

Catalysis

The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
Factors Influencing the Rate of Chemical Reactions01:22

Factors Influencing the Rate of Chemical Reactions

A variety of factors influence the rate of chemical reactions. For a chemical reaction to happen, atoms must collide with enough energy to overcome the repulsion between their electrons. This energy is called activation energy. Factors influencing the rate of reaction either lower the activation energy or increase the likelihood of a successful collision.
Concentration and Pressure:
The more particles present within a given space, the more likely those particles are to bump into one another.
Introduction to Mechanisms of Enzyme Catalysis01:13

Introduction to Mechanisms of Enzyme Catalysis

For many years, scientists thought that enzyme-substrate binding took place in a simple "lock-and-key" fashion. This model stated that the enzyme and substrate fit together perfectly in one instantaneous step. However, current research supports a more refined view scientists call induced fit. The induced-fit model expands upon the lock-and-key model by describing a more dynamic interaction between enzyme and substrate. As the enzyme and substrate come together, their interaction causes a mild...
Introduction to Mechanisms of Enzyme Catalysis01:13

Introduction to Mechanisms of Enzyme Catalysis

For many years, scientists thought that enzyme-substrate binding took place in a simple "lock-and-key" fashion. This model stated that the enzyme and substrate fit together perfectly in one instantaneous step. However, current research supports a more refined view scientists call induced fit. The induced-fit model expands upon the lock-and-key model by describing a more dynamic interaction between enzyme and substrate. As the enzyme and substrate come together, their interaction causes a mild...
Heterogeneous Catalysis01:22

Heterogeneous Catalysis

Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...

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Updated: Jun 2, 2026

Mizoroki-Heck Cross-coupling Reactions Catalyzed by Dichloro{bis[1,1',1''-(phosphinetriyl)tripiperidine]}palladium Under Mild Reaction Conditions
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Mizoroki-Heck Cross-coupling Reactions Catalyzed by Dichloro{bis[1,1',1''-(phosphinetriyl)tripiperidine]}palladium Under Mild Reaction Conditions

Published on: March 20, 2014

Catalysis in reaction networks.

Manoj Gopalkrishnan1

  • 1School of Technology and Computer Science, Tata Institute of Fundamental Research, Mumbai, India. manoj@tcs.tifr.res.in

Bulletin of Mathematical Biology
|April 20, 2011
PubMed
Summary
This summary is machine-generated.

Catalytic networks, essential for DNA molecular circuits, are defined by pathways activated by catalysts. Weakly-reversible networks with critical siphons are proven to be catalytic, offering new insights into chemical reaction systems.

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Area of Science:

  • Biochemistry
  • Systems Biology
  • Chemical Reaction Networks

Background:

  • Catalytic networks are chemical reaction networks with pathways sensitive to catalyst presence.
  • Synthetic DNA molecular circuits exemplify catalytic networks, demonstrating signal amplification and molecular logic.
  • Critical siphons are defined as subsets of species in a network whose absence is forward invariant and stoichiometrically compatible with a positive point.

Purpose of the Study:

  • To define and characterize catalytic networks within the framework of chemical reaction systems.
  • To establish a theorem linking weakly-reversible networks with critical siphons to catalytic behavior.
  • To provide new proofs for the persistence of specific chemical reaction systems, including atomic event-systems and normal networks.

Main Methods:

  • Formal definition of catalytic networks based on catalyst-dependent reaction pathways.
  • Mathematical analysis of chemical reaction networks, focusing on weak reversibility and critical siphons.
  • Application of network theory to prove the catalytic nature of weakly-reversible networks possessing critical siphons.

Main Results:

  • A main theorem is presented: all weakly-reversible networks with critical siphons are catalytic.
  • The study provides novel proofs for the persistence of atomic event-systems and normal networks.
  • Autocatalytic networks are defined, and a conjecture is proposed regarding their equivalence to weakly-reversible networks with critical siphons.

Conclusions:

  • Weakly-reversible networks with critical siphons are definitively catalytic.
  • The findings offer a deeper understanding of catalytic networks and their properties.
  • The proposed conjecture on autocatalytic networks warrants further investigation.