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Related Concept Videos

Deconvolution01:20

Deconvolution

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Deconvolution, also known as inverse filtering, is the process of extracting the impulse response from known input and output signals. This technique is vital in scenarios where the system's characteristics are unknown, and they must be inferred from the observable signals.
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The pH of a solution containing an acid can be determined using its acid dissociation constant and its initial concentration. If a solution contains two different acids, then its pH can be determined using one of several methods depending upon the relative strength of the acids and their dissociation constants.
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Effective sample preparation is crucial for accurate and reliable laboratory analysis. During this process, two significant sources of error can arise: concentration bias from improper sample splitting and contamination caused by methods used to reduce particle size, such as grinding or homogenization. Identifying and minimizing these potential errors is crucial to ensuring the validity of the analysis.
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A racemic mixture, or racemate, is an equimolar mixture of enantiomers of a molecule that can be separated using their unique interaction with chiral molecules or media. Racemic mixtures are denoted by the (±)- prefix. This ‘optical rotation descriptor’ applies to the whole solution of a racemic mixture rather than a specific stereoisomer. Enantiomers typically have the same physical and chemical properties. Hence, they are not easily separable. However, enantiomers can exhibit...
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Nanoparticle Tracking Analysis of Gold Nanoparticles in Aqueous Media through an Inter-Laboratory Comparison
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Inter-sample contamination detection using mixture deconvolution comparison.

Duncan Taylor1, Emily Rowe2, Maarten Kruijver3

  • 1Forensic Science SA, GPO Box 2790, Adelaide, SA 5001, Australia; School of Biological Sciences, Flinders University, GPO Box 2100 Adelaide, SA 5001, Australia.

Forensic Science International. Genetics
|March 10, 2019
PubMed
Summary
This summary is machine-generated.

This study explored DNA mixture comparison for detecting sample contamination and identifying potential criminal links. While no contamination was found, the DNA mixture comparison tool revealed a significant intelligence link between samples.

Keywords:
ContaminationDeconvolutionExtraction batchMixture comparison

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Area of Science:

  • Forensic Science
  • Molecular Biology
  • Genetics

Background:

  • Comparing mixed DNA profiles can assess the probability of a common contributor.
  • This has applications in forensic quality assurance and intelligence gathering.

Purpose of the Study:

  • To investigate sample-to-sample contamination in DNA extraction and electrophoresis.
  • To assess the utility of a mixture-to-mixture comparison tool for forensic intelligence.

Main Methods:

  • Pairwise comparisons of deconvoluted mixed DNA profiles using STRmix™.
  • Analysis of samples within extraction and run batches to identify potential contamination sources.
  • Evaluation of contamination risk from laboratory mechanisms.

Main Results:

  • No evidence of sample-to-sample contamination was identified.
  • A potential intelligence link between unrelated samples was discovered.
  • The mixture-to-mixture comparison tool demonstrated utility beyond contamination detection.

Conclusions:

  • The mixture-to-mixture comparison tool is effective for identifying potential links between DNA samples.
  • The tool can be valuable for forensic intelligence investigations.
  • Further research is warranted to explore the full capabilities of DNA mixture comparison.