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Related Concept Videos

Enzyme Kinetics01:19

Enzyme Kinetics

Enzymes speed up reactions by lowering the activation energy of the reactants. The speed at which the enzyme turns reactants into products is called the rate of reaction. Several factors impact the rate of reaction, including the number of available reactants. Enzyme kinetics is the study of how an enzyme changes the rate of a reaction.
Scientists typically study enzyme kinetics with a fixed amount of enzyme in the controlled environment of a test tube. When more reactant, or substrate, is...
Introduction to Enzyme Kinetics01:19

Introduction to Enzyme Kinetics

Enzyme kinetics studies the rates of biochemical reactions. Scientists monitor the reaction rates for a particular enzymatic reaction at various substrate concentrations. Additional trials with inhibitors or other molecules that affect the reaction rate may also be performed.
The experimenter can then plot the initial reaction rate or velocity (Vo) of a given trial against the substrate concentration ([S]) to obtain a graph of the reaction properties. For many enzymatic reactions involving a...
Nonlinear Pharmacokinetics: Michaelis-Menten Equation01:18

Nonlinear Pharmacokinetics: Michaelis-Menten Equation

The Michaelis–Menten equation is a fundamental model for describing capacity-limited kinetics in drug metabolism. It offers insights into the rate of decline of plasma drug concentration Cp over time, with Vmax and KM as pivotal parameters.
Vmax represents the maximum achievable process rate, while KM, known as the Michaelis constant, signifies the drug concentration at which the process rate reaches half its maximum. This relationship between Vmax, KM, and Cp gives rise to three distinct...
Fundamental Mathematical Principles in Pharmacokinetics: Rate and Order of Reaction01:15

Fundamental Mathematical Principles in Pharmacokinetics: Rate and Order of Reaction

In pharmacokinetics, the rates and order of reactions play a crucial role in understanding how the body processes drugs and help us comprehend drug absorption, distribution, metabolism, and elimination. A critical concept in pharmacokinetics is the rate constant, which quantifies the speed of a reaction. It provides valuable information about the kinetics of drug elimination. The rate constant allows us to determine the rate at which drugs are eliminated from the body.
Pharmacokinetic reactions...
Elimination Kinetics: First-Order and Zero-Order01:05

Elimination Kinetics: First-Order and Zero-Order

Eliminating drugs from the body is a vital process that occurs through excretion or metabolism. Understanding the kinetics of drug elimination is crucial for drug development, dosage determination, and optimizing patient outcomes.
Drug clearance depends on the rate of drug elimination and its plasma concentration. Another important parameter is a drug's half-life, which is the time required for its concentration to decrease by half. In most cases, drug clearance follows first-order kinetics,...
The Integrated Rate Law: The Dependence of Concentration on Time02:39

The Integrated Rate Law: The Dependence of Concentration on Time

While the differential rate law relates the rate and concentrations of reactants, a second form of rate law called the integrated rate law relates concentrations of reactants and time. Integrated rate laws can be used to determine the amount of reactant or product present after a period of time or to estimate the time required for a reaction to proceed to a certain extent. For example, an integrated rate law helps determine the length of time a radioactive material must be stored for its...

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Related Experiment Video

Updated: Jun 12, 2026

Steady-state, Pre-steady-state, and Single-turnover Kinetic Measurement for DNA Glycosylase Activity
14:27

Steady-state, Pre-steady-state, and Single-turnover Kinetic Measurement for DNA Glycosylase Activity

Published on: August 19, 2013

Geometry-controlled kinetics.

O Bénichou1, C Chevalier, J Klafter

  • 1UPMC Univ Paris 06, CNRS-UMR 7600 Laboratoire de Physique Théorique de la Matière Condensée, 4 Place Jussieu, F-75005 Paris, France. benichou@lptmc.jussieu.fr

Nature Chemistry
|May 22, 2010
PubMed
Summary
This summary is machine-generated.

Transport properties influence reaction speed, measured by first-passage time (FPT). This study analytically determines FPT distributions in complex geometries, revealing universal classes for various diffusion types and introducing geometry-controlled kinetics.

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Kinetic Screening of Nuclease Activity using Nucleic Acid Probes
06:52

Kinetic Screening of Nuclease Activity using Nucleic Acid Probes

Published on: November 1, 2019

Related Experiment Videos

Last Updated: Jun 12, 2026

Steady-state, Pre-steady-state, and Single-turnover Kinetic Measurement for DNA Glycosylase Activity
14:27

Steady-state, Pre-steady-state, and Single-turnover Kinetic Measurement for DNA Glycosylase Activity

Published on: August 19, 2013

Kinetic Screening of Nuclease Activity using Nucleic Acid Probes
06:52

Kinetic Screening of Nuclease Activity using Nucleic Acid Probes

Published on: November 1, 2019

Area of Science:

  • Physical Chemistry
  • Chemical Physics
  • Theoretical Chemistry

Background:

  • Molecular transport properties significantly influence reaction kinetics.
  • First-passage time (FPT) quantifies the time for a diffusing molecule to reach a target.
  • Calculating FPT distributions in complex confined geometries has been a significant challenge.

Purpose of the Study:

  • To analytically determine the first-passage time (FPT) distribution in realistic confined geometries.
  • To demonstrate that diverse transport processes fall into common universality classes.
  • To introduce and explore the concept of 'geometry-controlled kinetics'.

Main Methods:

  • Analytical calculation of first-passage time (FPT) distributions.
  • Investigation of various transport processes including regular diffusion, anomalous diffusion, and diffusion in disordered media and fractals.
  • Analysis of the impact of geometric constraints and initial reactant distances on reaction kinetics.

Main Results:

  • The FPT distribution in realistic confined geometries can be calculated analytically.
  • Regular diffusion, anomalous diffusion, and diffusion in disordered media/fractals share the same universality classes.
  • Geometry, particularly the initial distance between reactants, emerges as a key parameter in 'compact' systems.

Conclusions:

  • The study provides a framework for understanding reaction kinetics influenced by molecular transport in complex environments.
  • The concept of 'geometry-controlled kinetics' offers new insights into diffusion-limited reactions.
  • Findings have implications for understanding gene regulation and other spatially organized biological processes.