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Related Concept Videos

Entropy02:39

Entropy

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Salt particles that have dissolved in water never spontaneously come back together in solution to reform solid particles. Moreover, a gas that has expanded in a vacuum remains dispersed and never spontaneously reassembles. The unidirectional nature of these phenomena is the result of a thermodynamic state function called entropy (S). Entropy is the measure of the extent to which the energy is dispersed throughout a system, or in other words, it is proportional to the degree of disorder of a...
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Entropy01:18

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The first law of thermodynamics is quantitatively formulated via an equation relating the internal energy of a system, the heat exchanged by it, and the work done on it. A quantitative formulation of the second law of thermodynamics leads to defining a state function, the entropy.
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Standard Entropy Change for a Reaction03:00

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What is Conservation Biology?01:57

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Conservation biology is a scientific field that focuses on the preservation of biodiversity in order to protect ecosystems while meeting the needs of the human population. Humans require properly functioning ecosystems to maintain our supply of natural resources, including food, medicines, and building materials.
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Conservation of Small Populations02:04

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Small population sizes put a species at extreme risk of extinction due to a lack of variation, and a consequent decrease in adaptability. This weakens the chances of survival under pressures such as climate change, competition from other species, or new diseases. Large populations are more likely to survive pressures such as these, as such populations are more likely to harbor individuals that have genetic variants that are adaptive under new stresses. Small populations are much less...
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A residual plot is a statistical representation of data used to analyze correlation and regression results. It helps verify the requirements for drawing specific conclusions about correlation and regression. To obtain the residual plot, first, the residual for each data value is calculated, which is simply the vertical distance between the observed and the predicted value obtained from the regression equation.
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Related Experiment Video

Updated: Feb 13, 2026

Optimization of Processing of Tiebangchui with Highland Barley Wine Based on the Box-Behnken Design Combined with the Entropy Method
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Incorporating background frequency improves entropy-based residue conservation measures.

Kai Wang1, Ram Samudrala

  • 1Computational Genomics Group, Department of Microbiology, University of Washington, USA. dna@u.washington.edu

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|August 19, 2006
PubMed
Summary

Incorporating amino acid background frequencies into relative entropy calculations improves the identification of functional sites in protein alignments. This approach enhances the biological relevance of bioinformatics analyses.

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Area of Science:

  • Bioinformatics
  • Computational Biology
  • Protein Sequence Analysis

Background:

  • Entropy-based methods are used for scoring sequence conservation in protein multiple sequence alignments.
  • High-scoring positions in alignments can indicate structurally or functionally important residues.
  • Traditional methods often neglect amino acid background frequencies.

Purpose of the Study:

  • To develop an improved method for identifying functional sites in protein alignments.
  • To evaluate the impact of incorporating amino acid background frequencies into entropy-based scoring.

Main Methods:

  • Utilized a relative entropy measure incorporating amino acid background frequencies.
  • Applied the method to protein multiple sequence alignments.

Main Results:

  • The relative entropy measure with background frequencies demonstrated improved performance in identifying functional sites.
  • This enhanced method provides more accurate identification of critical residues.

Conclusions:

  • Incorporating background frequencies into relative entropy calculations leads to more biologically relevant results.
  • This approach has broad applicability in various bioinformatics fields.
  • The findings suggest a refinement for sequence conservation analysis.