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Related Concept Videos

Mixtures of Acids03:27

Mixtures of Acids

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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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The pH of a solution containing an acid can be determined using its acid dissociation constant and initial concentration. If a solution contains two different acids, then its pH can be determined using one of several methods depending on the relative strength of the acids and their dissociation constants.
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Gain and phase shift are properties of linear circuits that describe the effect a circuit has on a sinusoidal input voltage or current. The circuit's behavior that contains reactive elements will depend on the frequency of the input sinusoid. As a result, it is observed that the gain and phase shift will all be frequency functions.
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IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

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Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single...
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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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When infrared radiation is passed through a molecule, absorption occurs if the molecule's vibration leads to a substantial change in its bond dipole moment. Transitions between vibrational energy levels, typically corresponding to infrared frequencies (4000–400 cm−1), allow absorption if the vibration significantly alters the dipole moment, making the molecule infrared active. The molecular bonds have different stretching and bending vibrations, resulting in various peaks with...
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The information gain from peak height data in DNA mixtures.

K Slooten1

  • 1Netherlands Forensic Institute, P.O. Box 24044, 2490 AA The Hague, The Netherlands; VU University Amsterdam, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands.

Forensic Science International. Genetics
|July 11, 2018
PubMed
Summary

Comparing DNA mixture analysis methods, the peak height model (EuroForMix) offers stronger evidence than the discrete model (MixKin) for single-replicate samples. Both methods show low false positive rates, but the discrete model risks higher false positives for related individuals without kinship analysis.

Keywords:
DNA mixturesWeight of evidence

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Area of Science:

  • Forensic Science
  • Genetics
  • Statistical Analysis

Background:

  • DNA mixture analysis is crucial in forensic investigations.
  • Two primary methods exist: peak height models and discrete models.
  • Understanding their comparative performance is vital for accurate evidence evaluation.

Purpose of the Study:

  • To compare likelihood ratios from DNA mixture data using a peak height model (EuroForMix) and a discrete model (MixKin).
  • To evaluate the impact of replicate analyses on the weight of evidence.
  • To assess false positive rates, particularly for related individuals.

Main Methods:

  • Utilized publicly available DNA mixture data from previous publications.
  • Employed EuroForMix (peak height model) and MixKin (discrete model with dropout probabilities).
  • Analyzed data with and without replicate analyses to assess model sensitivity.

Main Results:

  • For mixtures with replicates, both models yielded similar weights of evidence, indicating limited added value from peak heights.
  • For single-replicate mixtures, the peak height model provided substantially higher weight of evidence for true donors.
  • Both methods exhibited low false positive rates, but the discrete model showed a higher risk for related non-contributors unless kinship was considered.

Conclusions:

  • The peak height model (EuroForMix) offers advantages for single-replicate DNA mixtures.
  • The choice of model can impact the weight of evidence, especially when replicates are absent.
  • Accurate forensic DNA analysis requires careful consideration of the model used and potential kinship relationships to minimize false positives.