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Related Concept Videos

Conservative Site-specific Recombination and Phase Variation02:53

Conservative Site-specific Recombination and Phase Variation

Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
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Reversible or Opposing Reactions01:26

Reversible or Opposing Reactions

Reversible or opposing reactions play a crucial role in understanding the dynamic nature of chemical processes. While kinetics focuses on how reactions proceed, thermodynamics emphasizes that most reactions do not reach completion. Instead, a reverse reaction starts occurring over time, and when its rate equals that of the forward reaction, a dynamic equilibrium is established.For example, consider a simple chemical process where A forms B reversibly. The rate constants for the forward and...
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In an SN2 reaction, the nucleophilic attack on the substrate and departure of the leaving group occurs simultaneously through a transition state. As the nucleophile approaches the substrate from the back-side, the configuration of the substrate carbon changes from tetrahedral to trigonal bipyramidal and then back to tetrahedral, leading to an inversion in the configuration of the product.
If the substrate is an achiral molecule at the α-carbon, the inversion of configuration is not observed.
SN1 Reaction: Stereochemistry02:15

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Woodward–Hoffmann Selection Rules and Microscopic Reversibility01:34

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Principles of Site-Specific Recombinase (SSR) Technology
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Published on: May 29, 2008

Multisite reversible geminate reaction.

Soohyung Park1, Noam Agmon

  • 1Institute of Chemistry and the Fritz Haber Research Center, The Hebrew University of Jerusalem, Jerusalem 91904, Israel.

The Journal of Chemical Physics
|February 26, 2009
PubMed
Summary
This summary is machine-generated.

This study presents an analytic solution for diffusion-influenced reactions with multiple binding sites. The findings describe reaction kinetics at short, intermediate, and long times, applicable to systems like proton transfer and water dynamics.

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Area of Science:

  • Chemical Kinetics
  • Physical Chemistry
  • Theoretical Chemistry

Background:

  • Diffusion-influenced reactions are crucial in chemical and biological processes.
  • Understanding geminate reactions with multiple binding sites is complex.
  • Existing models often lack comprehensive analytical solutions for multisite interactions.

Purpose of the Study:

  • To develop an analytic solution for diffusion-influenced geminate reactions with multiple reversible binding sites.
  • To analyze the time-dependent behavior of particle occupancy across these sites.
  • To provide a model applicable to diverse physical and chemical systems.

Main Methods:

  • Solution in the Laplace domain for overlapping spherical sites with no long-range interactions.
  • Analysis of a characteristic polynomial to determine invertibility into the time domain.
  • Application of Lagrange interpolation for partial-fraction expansion and termwise inversion.

Main Results:

  • Occupancy decays as t(-3/2) at long times for all initial conditions.
  • Short-time binding probability shows distinct power-law dependencies on initial conditions (t(1/2) or t(3/2)).
  • Intermediate-time kinetics exhibit N decaying exponentials, distinguishing between reaction-controlled and diffusion-controlled steps.

Conclusions:

  • The derived analytic solution offers a robust framework for studying complex reaction dynamics.
  • The model accurately captures both diffusion and reaction-limited kinetics in multisite systems.
  • This work has implications for understanding phenomena ranging from molecular binding to the dynamics of liquid water.