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Related Concept Videos

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...
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...
Measuring Reaction Rates03:09

Measuring Reaction Rates

Polarimetry finds application in chemical kinetics to measure the concentration and reaction kinetics of optically active substances during a chemical reaction. Optically active substances have the capability of rotating the plane of polarization of linearly polarized light passing through them—a feature called optical rotation. Optical activity is attributed to the molecular structure of substances. Normal monochromatic light is unpolarized and possesses oscillations of the electrical field in...
Determination of Michaelis Constant and Maximum Elimination Rate01:20

Determination of Michaelis Constant and Maximum Elimination Rate

The Michaelis constant (KM) and the theoretical maximum process rate (Vmax) are vital parameters in the Michaelis-Menten equation, central to many biochemical reactions. They provide essential insights into enzyme kinetics and drug metabolism.
These parameters can be estimated by analyzing plasma concentration data post-drug administration. A notable example of this application is phenytoin, a drug with capacity-limited kinetics. It's recommended that phenytoin should be administered at two...
Introduction to R01:11

Introduction to R

R is a powerful software environment for statistical computing and graphics. Originating as an implementation of the S language, developed at Bell Laboratories, R has evolved into a robust, open-source statistical software favored by statisticians and data scientists worldwide. Its comprehensive suite includes data manipulation, calculation, and graphical display capabilities, making it versatile for data analysis and visualization. Its programming language is at the core of R's functionality,...
Arrhenius Plots02:34

Arrhenius Plots

The Arrhenius equation relates the activation energy and the rate constant, k, for chemical reactions. In the Arrhenius equation, k = Ae−Ea/RT, R is the ideal gas constant, which has a value of 8.314 J/mol·K, T is the temperature on the kelvin scale, Ea is the activation energy in J/mole, e is the constant 2.7183, and A is a constant called the frequency factor, which is related to the frequency of collisions and the orientation of the reacting molecules.
The Arrhenius equation can be used to...

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Related Experiment Video

Updated: Jun 1, 2026

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

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Published on: November 1, 2019

SigrafW: An easy-to-use program for fitting enzyme kinetic data.

Francisco Assis Leone1, José Augusto Baranauskas, Rosa Prazeres Melo Furriel

  • 1Departamento de Química, Universidade de São Paulo, 14040-901 Ribeirão Preto, São Paulo, Brasil. fdaleone@ffclrp.usp.br.

Biochemistry and Molecular Biology Education : a Bimonthly Publication of the International Union of Biochemistry and Molecular Biology
|June 4, 2011
PubMed
Summary
This summary is machine-generated.

SigrafW software provides accurate enzyme kinetic analysis using the Hill equation. It simplifies the determination of key parameters like maximal velocity (V) and dissociation constant (K) for various enzyme types.

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Area of Science:

  • Biochemistry
  • Enzyme Kinetics
  • Computational Biology

Background:

  • Enzyme kinetics analysis is crucial for understanding enzyme mechanisms.
  • Existing software often requires initial parameter estimates and may introduce bias through linear transformations.

Purpose of the Study:

  • To introduce SigrafW, a novel Windows-compatible software for enzyme kinetic data fitting.
  • To highlight SigrafW's advantages over existing kinetic analysis programs.

Main Methods:

  • Utilizes the simplified Hill equation for fitting kinetic data.
  • Employs a modified Fibonacci search to determine kinetic parameters (V, n, K).
  • Performs nonlinear regression using the Wilkinson method for unbiased parameter estimation.

Main Results:

  • SigrafW accurately fits both hyperbolic and nonhyperbolic enzyme saturation curves.
  • Provides goodness-of-fit measures for each calculation.
  • Eliminates the need for initial parameter estimates.

Conclusions:

  • SigrafW offers a robust and user-friendly tool for enzyme kinetic analysis and simulation.
  • The software's advantages include unbiased parameter estimation and ease of use for research and education.