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Related Concept Videos

What is Variation?01:14

What is Variation?

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Apart from the measures of central tendency, distribution, outliers, and the changing characteristics of data with time, an important characteristic of any data set is its variation or spread. In some data sets, the data values are concentrated closely near the mean; in others, the data values are more widely spread out from the mean.
The range, standard deviation, standard error, and variance are the different measures of variation.
Range: The range is the difference between its maximum and...
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Variation01:19

Variation

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An important characteristic of any set of data is the variation in the data. In some data sets, the data values are concentrated closely near the mean; in other data sets, the data values are more widely spread out from the mean. The most common measure of variation, or spread, is the standard deviation, which is the square root of variance.
When independent and dependent variables are plotted on a scatter plot, the slope of a line is a value that describes the rate of change between the two...
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Conservative Site-specific Recombination and Phase Variation02:53

Conservative Site-specific Recombination and Phase Variation

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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.
The recognition sites for Cre recombinase called LoxP...
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Variation of Atmospheric Pressure01:18

Variation of Atmospheric Pressure

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Change in atmospheric pressure with height is particularly interesting. The decrease in atmospheric pressure with increasing altitude is due to the decreasing gravitational force per unit area as we move away from the surface of the earth.
Assuming the air temperature is constant at a given altitude and that the ideal gas law of thermodynamics describes the atmosphere to a good approximation, one can find the variation of atmospheric pressure with height.
Let p(y) be the atmospheric pressure at...
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Comparing Copy Number Variations and SNPs02:26

Comparing Copy Number Variations and SNPs

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Sequencing of the human genome has opened up several best-kept secrets of the genome. Scientists have identified thousands of genome variations that exist within a population. These variations can be a single nucleotide or a larger chromosomal variation.
Copy number variations or CNVs are the structural variations that cover more than 1kb of DNA sequence. The single nucleotide polymorphism (SNP), on the other hand, is a single nucleotide change or a point mutation that is found in more than 1%...
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Coefficient of Variation01:10

Coefficient of Variation

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The coefficient of variation measures the dispersion of the data points or distribution around the mean. Using the coefficient of variation, we can compare two data series with drastically different means or different units of measurement. The coefficient of variation for a sample and a population is expressed as a percentage of the ratio of standard deviation to the mean.
The coefficient of variation is a practical statistical tool in finance. It allows investors to assess the volatility or...
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Updated: Jan 27, 2026

Variations on Negative Stain Electron Microscopy Methods: Tools for Tackling Challenging Systems
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Variations on Negative Stain Electron Microscopy Methods: Tools for Tackling Challenging Systems

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Newest Methods for Detecting Structural Variations.

Wouter De Coster1, Christine Van Broeckhoven1

  • 1Neurodegenerative Brain Diseases Group, Center for Molecular Neurology, VIB, Antwerp, Belgium; Department of Biomedical Sciences, University of Antwerp, Antwerp, Belgium.

Trends in Biotechnology
|March 24, 2019
PubMed
Summary
This summary is machine-generated.

New sequencing technologies improve the investigation of human genome structural variations, aiding in understanding complex diseases and human diversity. This research outlines advanced methods for creating a comprehensive structural variation catalog.

Keywords:
genome sequencinginversionlong-read sequencingstructural variantstechnology

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Area of Science:

  • Genomics
  • Human Genetics
  • Bioinformatics

Background:

  • Significant human genome structural variation is uncharacterized due to technological limits and genomic complexity.
  • Structural variations influence human diversity and disease, yet the genetic basis for many complex disorders remains unknown.
  • Understanding these variations is crucial for disease diagnosis, genetic counseling, and therapeutic development.

Purpose of the Study:

  • To highlight advancements in sequencing technologies for structural variation analysis.
  • To explore opportunities for investigating the impact of structural variation on human health and diversity.
  • To propose a strategy for creating a comprehensive catalog of structural variations across diverse populations.

Main Methods:

  • Utilizing innovative sequencing methods including linked read sequencing, strand-specific sequencing, and long-read sequencing.
  • Applying high-resolution technologies to overcome limitations in detecting structural variations.
  • Developing a systematic approach for population-wide structural variation cataloging.

Main Results:

  • New technologies offer increased resolution for detecting and characterizing structural variations.
  • These advancements facilitate a deeper understanding of how structural variations contribute to human diversity and disease.
  • A strategic framework is presented for comprehensive structural variation discovery.

Conclusions:

  • Emerging sequencing technologies are revolutionizing the study of human genome structural variation.
  • Improved detection of structural variations is key to unraveling the genetic etiology of complex diseases.
  • The proposed strategy enables the creation of a valuable resource for population genetics and personalized medicine.