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Related Concept Videos

Phylogenetic Trees03:21

Phylogenetic Trees

Phylogenetic trees come in many forms. It matters in which sequence the organisms are arranged from the bottom to the top of the tree, but the branches can rotate at their nodes without altering the information. The lines connecting individual nodes can be straight, angled, or even curved.The length of the branches can depict time or the relative amount of change among organisms. For instance, the branch length might indicate the number of amino acid changes in the sequence that underlies the...
Phylogenetic Trees03:21

Phylogenetic Trees

Phylogenetic trees come in many forms. It matters in which sequence the organisms are arranged from the bottom to the top of the tree, but the branches can rotate at their nodes without altering the information. The lines connecting individual nodes can be straight, angled, or even curved.The length of the branches can depict time or the relative amount of change among organisms. For instance, the branch length might indicate the number of amino acid changes in the sequence that underlies the...
Woodward–Hoffmann Selection Rules and Microscopic Reversibility01:34

Woodward–Hoffmann Selection Rules and Microscopic Reversibility

Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
Survival Tree01:19

Survival Tree

Survival trees are a non-parametric method used in survival analysis to model the relationship between a set of covariates and the time until an event of interest occurs, often referred to as the "time-to-event" or "survival time." This method is particularly useful when dealing with censored data, where the event has not occurred for some individuals by the end of the study period, or when the exact time of the event is unknown.
 Building a Survival Tree
Constructing a survival tree begins...
Midpoint Rule01:20

Midpoint Rule

Approximating areas under curved boundaries is a common problem in applied mathematics, particularly when an exact calculation is difficult or impractical. One effective numerical method for this purpose is the Midpoint Rule, which provides an estimate of the area under a curve by using rectangular approximations over a specified interval.Description of the Midpoint RuleThe Midpoint Rule begins by dividing the given interval into a number of equal subintervals. For each subinterval, the...
Kirchoff's Rules: Application01:22

Kirchoff's Rules: Application

Kirchhoff's rules quantify the current flowing through a circuit and the voltage variations around the loop in a circuit. Applying Kirchhoff's rules generates a set of linear equations that allow us to find the unknown values in circuits. These may be currents, voltages, or resistances.
When applying Kirchhoff's first rule, the junction rule, label the current in each branch and decide its direction. If the chosen direction is wrong, it will have the correct magnitude, although the current will...

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Related Experiment Video

Updated: Jun 10, 2026

Creating and Applying a Reference to Facilitate the Discussion and Classification of Proteins in a Diverse Group
07:49

Creating and Applying a Reference to Facilitate the Discussion and Classification of Proteins in a Diverse Group

Published on: August 16, 2017

Majority-rule (+) consensus trees.

Jianrong Dong1, David Fernández-Baca, F R McMorris

  • 1Department of Computer Science, Iowa State University, Ames, IA 50011, USA.

Mathematical Biosciences
|August 17, 2010
PubMed
Summary
This summary is machine-generated.

This study introduces a novel consensus method that refines majority-rule consensus trees in phylogenetics. The new approach enhances summary tree accuracy by incorporating additional compatible clusters.

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Last Updated: Jun 10, 2026

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Published on: August 16, 2017

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Area of Science:

  • Systematic Biology
  • Computational Biology
  • Phylogenetics

Background:

  • Consensus trees are essential for summarizing information from multiple phylogenetic trees in systematic biology.
  • The majority-rule consensus tree is a widely used method for this purpose.

Purpose of the Study:

  • To introduce and characterize a new consensus method for phylogenetic tree summarization.
  • To refine the existing majority-rule consensus tree by incorporating additional compatible clusters.

Main Methods:

  • Development of a novel consensus algorithm.
  • Characterization of the new method's properties.
  • Comparison with the majority-rule consensus tree.

Main Results:

  • Introduction of a new consensus method that refines the majority-rule tree.
  • The method incorporates compatible clusters based on a defined criterion.
  • Demonstration of the method's effectiveness in improving phylogenetic tree summarization.

Conclusions:

  • The proposed consensus method offers an improvement over the standard majority-rule consensus tree.
  • This new approach provides a more detailed and accurate summary of phylogenetic information.
  • The method's simple criterion ensures practical applicability in systematic biology studies.