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Related Concept Videos

Distance Problem01:29

Distance Problem

When an object's velocity changes over time, the total distance traveled can be determined by summing small displacement intervals over short increments. This approach approximates the true distance through numerical summation and the use of integral calculus. An estimate of the total displacement can be obtained by measuring velocity at regular intervals and multiplying each value by the corresponding time step.If a runner accelerates over the first three seconds of a race, speed measurements...
Distance Measurements by Taping01:18

Distance Measurements by Taping

Tapes are essential in surveying for accurate, durable, and short-distance measurements. Made from lightweight, nylon-coated steel, they offer flexibility and strength for rugged outdoor use. The nylon coating protects against rust and wear, extending the tape's life. Standard lengths, around 30 meters, are marked in meters and millimeters for precision.Surveyors select tapes based on site conditions and accuracy needs. Lightweight, nylon-coated tapes are commonly used for ease of handling and...
Distance Corrections01:15

Distance Corrections

To achieve precise distance measurements, especially in surveying and construction, certain corrections must be applied to account for potential sources of error like the standardization errors, temperature variations, and slope adjustments.Standardization error emerges when measurement equipment undergoes changes, such as wear, repairs, or weather impacts. To address this, surveyors compare the equipment’s readings to a standard. This process identifies any deviation that might lead to...
Area Computation by the Alternative Coordinate Method01:24

Area Computation by the Alternative Coordinate Method

The alternative coordinate method, also known as the Shoelace Formula, is a technique for determining the area of a traverse using Cartesian coordinates. This method relies on the sequential arrangement of x and y coordinates for each point of the shape, ensuring accuracy and ease of application.In this approach, each corner's x and y coordinates are listed as fractions, with the x-coordinate as the numerator and the y-coordinate as the denominator. These coordinates are arranged sequentially...
Design Example: Measuring Distance Between Two Points with Obstructions01:10

Design Example: Measuring Distance Between Two Points with Obstructions

When measuring distances in areas with physical obstructions, such as a lake in a field, surveyors must employ techniques to calculate accurate lengths without direct line measurements. One effective method is the offset technique, which allows for precise distance estimation over inaccessible stretches.In this scenario, a surveyor must measure a side of an area that crosses a lake. Since the measuring tape cannot span the lake, the surveyor begins by establishing a baseline that aligns with...
Fast Fourier Transform01:10

Fast Fourier Transform

The Fast Fourier Transform (FFT) is a computational algorithm designed to compute the Discrete Fourier Transform (DFT) efficiently. By breaking down the calculations into smaller, manageable sections, the FFT significantly reduces the computational complexity involved. Direct computation of an N-point DFT requires N2 complex multiplications, whereas the FFT algorithm needs only (N/2)log⁡2N multiplications, offering a much faster performance.
The computational efficiency of the FFT becomes...

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Related Experiment Video

Updated: Jul 5, 2026

Using Phylogenetic Analysis to Investigate Eukaryotic Gene Origin
08:57

Using Phylogenetic Analysis to Investigate Eukaryotic Gene Origin

Published on: August 14, 2018

Getting a tree fast: Neighbor Joining, FastME, and distance-based methods.

Richard Desper1, Olivier Gascuel

  • 1Department of Biology, University College, London, United Kingdom.

Current Protocols in Bioinformatics
|April 23, 2008
PubMed
Summary
This summary is machine-generated.

Neighbor Joining (NJ) and FastME are fast methods for building phylogenetic trees. FastME offers superior topological accuracy and speed compared to NJ, especially for large datasets.

Related Experiment Videos

Last Updated: Jul 5, 2026

Using Phylogenetic Analysis to Investigate Eukaryotic Gene Origin
08:57

Using Phylogenetic Analysis to Investigate Eukaryotic Gene Origin

Published on: August 14, 2018

Area of Science:

  • Computational Biology
  • Bioinformatics
  • Evolutionary Biology

Background:

  • Phylogenetic tree construction is crucial for understanding evolutionary relationships.
  • Distance-based methods offer computational efficiency for large datasets.
  • Neighbor Joining (NJ) is a popular but less accurate distance-based method.

Purpose of the Study:

  • To compare the performance of various distance-based phylogenetic tree construction methods.
  • To highlight the efficiency and accuracy of FastME.
  • To provide guidance on using distance-based methods, including bootstrapping and sequence alignment.

Main Methods:

  • Utilized computer simulations to evaluate topological accuracy.
  • Compared Neighbor Joining (NJ), FastME, BIONJ, WEIGHBOR, and FITCH.
  • Described evolutionary distance estimation from DNA and protein sequences.
  • Explained bootstrap analysis for phylogenetic reliability.
  • Introduced CLUSTAL for sequence alignment and tree generation.

Main Results:

  • FastME demonstrated the highest topological accuracy among tested distance-based methods.
  • FastME exhibited superior speed compared to NJ, particularly on large datasets.
  • NJ showed lower topological accuracy than FastME, FITCH, WEIGHBOR, and BIONJ.
  • Distance-based methods are effective when molecular clocks are violated or long branches are present.

Conclusions:

  • FastME is the most efficient and accurate distance-based method for phylogenetic tree construction currently available.
  • Distance-based methods, especially FastME, are valuable tools for large-scale phylogenetics and bootstrap analysis.
  • Understanding distance estimation and bootstrapping is essential for reliable phylogenetic inference.